This document provides information on downstream processing after fermentation. It discusses the 5 main stages: 1) solid-liquid separation through filtration or centrifugation, 2) cell disruption to release intracellular products using physical, chemical or enzymatic methods, 3) concentration through evaporation, liquid-liquid extraction or membrane filtration, 4) purification using chromatography, and 5) formulation of the final product. Specific techniques for each stage like centrifugation, solvent extraction, evaporation are explained in detail. The goal of downstream processing is to recover and purify the biomolecule of interest from the fermentation broth in an active form.
The document discusses various methods for recovering and purifying fermentation products. It describes how extraction is used to separate products from cells, including mechanical methods like homogenization and non-mechanical methods like solvent extraction. Purification techniques covered include precipitation, centrifugation, filtration, chromatography, electrophoresis, crystallization and drying which are used to separate and purify products based on properties like size, charge and solubility. The level of purification depends on the intended use of the product.
This document discusses downstream processing in fermentation. It describes various unit processes used to recover the target product including cell harvesting through centrifugation or filtration, cell disruption through mechanical or non-mechanical methods, and product purification using techniques like chromatography, precipitation, extraction, and distillation. The key factors affecting recovery of intracellular and extracellular products are also outlined.
This document summarizes downstream processing steps in bioprocessing. It discusses various unit operations used for product recovery including cell removal, dewatering, protein purification through adsorption chromatography or immobilization, and protein packaging through sterilization. Methods for solid separation like filtration, sedimentation, centrifugation and foam separation are described. The document also provides details on precipitation, filtration processes, and different types of filters used.
The document discusses several microbial culture collection centres around the world and in India. It provides information on the International Depositary Authorities (IDAs) like the American Type Culture Collection (ATCC) and describes some of the major microbial culture collection centres in India including the Microbial Culture Collection (MCC), Microbial Type Culture Collection and Gene Bank (MTCC), National Agriculturally Important Microbial Culture Collection (NAIMCC), and National Collection of Industrial Microorganisms (NCIM). It also outlines the objectives and services provided by these centres.
The document discusses various stages and techniques for recovering microbial products from fermentation broth. The first stage typically involves removing cells and debris through centrifugation or filtration. Next, the broth undergoes fractionation or extraction to separate components. Further purification may involve chromatography, crystallization, or membrane processes. The choice of recovery method depends on factors like the product's properties and stability. The goal is to obtain a highly purified product essentially free of impurities.
A centrifuge is a piece of laboratory equipment that uses centrifugal force to separate substances of different densities. It spins liquid samples at high speeds using a motor. There are various types of centrifuges depending on their size and capacity, including benchtop models for small samples and larger continuous centrifuges. Centrifuges work by accelerating samples outward using centrifugal force, allowing heavier components to separate out from lighter ones based on density and settle to the bottom. They are used widely in chemistry, biology and biochemistry applications like isolating cellular components and purifying proteins.
The document discusses various methods for cell disruption, which is the process of breaking open cells to release intracellular components. It describes both physical methods like bead mills, homogenizers, and ultrasonication as well as chemical/enzymatic methods like using detergents or osmotic shock. The ideal large-scale cell disrupter must disrupt tough organisms, have a well-understood and controllable mechanism, be sterilizable, economical, and amenable to automation. The choice of disruption method depends on factors like the cell type, product stability, and desired scale of production. Understanding the mechanisms of disruption helps control and validate the process.
Steps involved in fermentation products producing a viable product output.various steps and process were explained in them. A semester syllabus of undergraduate microbiology student in his/her semester -5 in paper -6 . I think this might be helpful to you and have a good response after reading this .thank you.
The document discusses various methods for recovering and purifying fermentation products. It describes how extraction is used to separate products from cells, including mechanical methods like homogenization and non-mechanical methods like solvent extraction. Purification techniques covered include precipitation, centrifugation, filtration, chromatography, electrophoresis, crystallization and drying which are used to separate and purify products based on properties like size, charge and solubility. The level of purification depends on the intended use of the product.
This document discusses downstream processing in fermentation. It describes various unit processes used to recover the target product including cell harvesting through centrifugation or filtration, cell disruption through mechanical or non-mechanical methods, and product purification using techniques like chromatography, precipitation, extraction, and distillation. The key factors affecting recovery of intracellular and extracellular products are also outlined.
This document summarizes downstream processing steps in bioprocessing. It discusses various unit operations used for product recovery including cell removal, dewatering, protein purification through adsorption chromatography or immobilization, and protein packaging through sterilization. Methods for solid separation like filtration, sedimentation, centrifugation and foam separation are described. The document also provides details on precipitation, filtration processes, and different types of filters used.
The document discusses several microbial culture collection centres around the world and in India. It provides information on the International Depositary Authorities (IDAs) like the American Type Culture Collection (ATCC) and describes some of the major microbial culture collection centres in India including the Microbial Culture Collection (MCC), Microbial Type Culture Collection and Gene Bank (MTCC), National Agriculturally Important Microbial Culture Collection (NAIMCC), and National Collection of Industrial Microorganisms (NCIM). It also outlines the objectives and services provided by these centres.
The document discusses various stages and techniques for recovering microbial products from fermentation broth. The first stage typically involves removing cells and debris through centrifugation or filtration. Next, the broth undergoes fractionation or extraction to separate components. Further purification may involve chromatography, crystallization, or membrane processes. The choice of recovery method depends on factors like the product's properties and stability. The goal is to obtain a highly purified product essentially free of impurities.
A centrifuge is a piece of laboratory equipment that uses centrifugal force to separate substances of different densities. It spins liquid samples at high speeds using a motor. There are various types of centrifuges depending on their size and capacity, including benchtop models for small samples and larger continuous centrifuges. Centrifuges work by accelerating samples outward using centrifugal force, allowing heavier components to separate out from lighter ones based on density and settle to the bottom. They are used widely in chemistry, biology and biochemistry applications like isolating cellular components and purifying proteins.
The document discusses various methods for cell disruption, which is the process of breaking open cells to release intracellular components. It describes both physical methods like bead mills, homogenizers, and ultrasonication as well as chemical/enzymatic methods like using detergents or osmotic shock. The ideal large-scale cell disrupter must disrupt tough organisms, have a well-understood and controllable mechanism, be sterilizable, economical, and amenable to automation. The choice of disruption method depends on factors like the cell type, product stability, and desired scale of production. Understanding the mechanisms of disruption helps control and validate the process.
Steps involved in fermentation products producing a viable product output.various steps and process were explained in them. A semester syllabus of undergraduate microbiology student in his/her semester -5 in paper -6 . I think this might be helpful to you and have a good response after reading this .thank you.
Crystallization and whole broth processing are important industrial techniques. Crystallization involves forming solid crystals from a solution, melt, or vapor and is widely used in pharmaceutical and chemical purification. It allows isolation of products with high purity at low cost. Whole broth processing recovers metabolites directly from unfiltered fermentation broth using methods like ion exchange resins, dialysis, expanded-bed adsorption, or resin absorption to minimize inhibitory effects during fermentation. Common equipment for crystallization includes tank crystallizers and forced circulation crystallizers.
Cell disruption is the process of breaking open cell walls to extract intracellular fluid and components without damaging them. The goal is an effective disruption while keeping products active. Methods include mechanical techniques like bead beating, blending, and homogenization which use physical force. Non-mechanical techniques involve freeze-thawing, osmotic shock, chemicals, enzymes, or electricity to disrupt cell walls and membranes in different ways. The optimal method depends on cell type and desired outcome.
Upstream bioprocessing involves steps like isolation and selection of microorganisms, media preparation, inoculation and incubation. Downstream bioprocessing involves steps like product harvesting, extraction, purification, quality control and packaging. Major upstream steps are formulation of fermentation medium, sterilization, inoculum preparation and fermentation. Downstream steps include cell disruption, solid-liquid separation, concentration, purification, formulation and quality monitoring. The overall process aims to isolate the desired product from fermentation broth in pure form through various unit operations.
Centrifugation is a process that uses centrifugal force to separate particles or molecules based on their size, shape, or density. It involves spinning a sample in a centrifuge to separate it into its components. There are various types of centrifugation classified based on speed, temperature, or separation method including differential, isopycnic, sucrose gradient, and ultracentrifugation. Centrifugation has many applications in industries like pharmaceuticals, water treatment, and oil extraction as well as in research areas like biochemistry and molecular biology.
The document discusses inoculum development and production media for industrial fermentation. It defines inoculum as a culture of microbes used to inoculate production-scale fermentations. Successful fermentations require developing inoculum to an active, healthy state in appropriate density. The document outlines factors that affect fermentation and discusses various media components like carbon sources, nitrogen sources, and trace elements. It also covers inoculum development methods for bacterial and mycelial cultures, preservation techniques, examples of media used for specific inocula, and criteria for a good inoculum.
The document discusses upstream processing in biomanufacturing. Upstream processing involves growing cells in bioreactors to produce target proteins for pharmaceuticals. Key aspects of upstream processing include media preparation and sterilization, inoculum development, and cell culture in bioreactors. The main goal of upstream processing is to provide optimal environmental conditions for cell growth and protein production before downstream processing separates and purifies the target proteins.
Centrifugation principle and types by Dr. Anurag YadavDr Anurag Yadav
concept of cnetrifugation,
basic Principle
centrifugal force
types of centrifugation based on use and rotor type
application of the each type of centrifuge
Ultracentrifuge in detail
application in general
The document provides an overview of selective downstream processing. It discusses the key stages of downstream processing including pretreatment, primary separation, and purification. Pretreatment involves cell separation techniques like filtration and centrifugation as well as cell disruption methods such as high-pressure homogenization and enzymatic lysis. Primary separation techniques covered are solvent extraction and salting out. Purification is discussed at a high level with a brief mention of chromatography. The document is presented by a group for a class on biochemical engineering.
Strain improvement Part II, Generation of mutants producing high level of pri...Renu Jaisinghani
This presentation, describes about various mutants that can be generated by carrying out process of mutation, so that high yielding mutants can be obtained that can be used for industrial production of primary metabolite.
This document discusses screening techniques used to isolate microorganisms of interest from a population. It describes primary screening as an initial process to discard many non-useful microbes while detecting a small percentage that may have industrial applications. Secondary screening further tests the capabilities of these isolated microorganisms to determine their real potential value. Some primary screening techniques mentioned include using crowded plates, detecting organic acid production, and screening for antibiotic production. The document also discusses improving crowded plate techniques and the goals and approaches of secondary screening to evaluate a microorganism's potential for industrial use.
For decades, cell lines have played a critical role in scientific developments. In most cases, researchers just got data generated from cell lines. However, due to some weaknesses of cell lines, scientists become increasingly cautious about these generated results. But now the game has changed! Primary cells now are believed to be a more biologically relevant tool than cell lines for studying human and animal biology. And we design this primary cell culture guide aimed at showing new investigators the basic principles of primary cell and some practical culture skills.
This document discusses various methods for cell disruption to release intracellular products, including physical methods like ultrasonication, osmotic shock, heat shock, and high pressure homogenization. It also covers chemical methods using alkalis, organic solvents, and detergents, as well as enzymatic methods using lysozyme. Several factors influence the effectiveness of these disruption techniques.
Downstream processing is an important step in the production of various industrial products. It involves the recovery and purification of products from fermentation broth. The first step is typically solid-liquid separation to remove cells and cell debris. This can be done through filtration, centrifugation, or precipitation. For intracellular products, cells must then be disrupted through physical, chemical, or enzymatic methods to release the product. Further purification and concentration steps such as liquid-liquid extraction, chromatography, crystallization are then used to obtain the final purified product. Proper selection of downstream processing methods depends on factors like the product properties and desired degree of purification.
The document discusses the key stages in downstream processing as part of bio manufacturing or biosynthesis of products. It describes how downstream processing involves removing cells and impurities from fermentation broth to produce the final product. The main stages discussed are removal of insolubles, product isolation, product purification, and product polishing. Key operations at each stage include filtration, centrifugation, precipitation, crystallization, and lyophilization.
Cell Disruption Strategies in Downstream ProcessingIlika Kaushik
Various methods of Cell Disruption in Downstream Processing.
Physical, Chemical and Biological methods of disrupting cells in order to extract the cellular components after fermentation.
The document discusses various methods for disrupting cells and extracting intracellular products, including physical methods like bead mills and French presses that disrupt cell walls, chemical/physicochemical methods using detergents or solvents to destabilize membranes, and a biological method using enzymes like lysozyme. The physical methods are best for breaking cell walls while chemical methods target membranes, and combinations of methods are often used to disrupt both barriers for complete cell lysis and product extraction.
Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures to separate the two miscible substances ,and also to analyze the hydrodynamic properties of macro molecule with a centrifuge , used in industry and in laboratory setting.
This document discusses various techniques for obtaining pure microbial cultures, including streak plating, spread plating, and pour plating. It explains that pure cultures are essential for identifying microbes and their antibiotic susceptibilities. The document outlines the historical development of these techniques from the late 19th century work of Koch and Loeffler to more modern methods like the micro-inoculation culture technique.
The document summarizes key aspects of upstream processing in fermentation. The upstream process includes culture isolation and screening to obtain desired microorganisms, inoculum preparation using increasing media volumes to actively grow cultures, and media formulation and sterilization. Primary screening qualitatively determines which microorganisms can produce compounds of interest, while secondary screening characterizes industrially important organisms and determines yield potentials under different conditions to select microbes suitable for industrial use. Important steps in inoculum preparation and considerations for media composition like carbon, nitrogen, minerals and growth factors are also outlined.
This document provides an overview of downstream processing in biotechnology. It discusses the key steps involved which include: 1) cell disruption to release intracellular products, 2) clarification to remove cells and debris, 3) concentration of the product stream, 4) purification which may involve multiple steps such as extraction and crystallization, and 5) final product formulation. Specific techniques are described at each step, for example centrifugation and filtration for clarification, evaporation and ultrafiltration for concentration, and liquid-liquid extraction, crystallization, and various types of chromatography for purification. The goal of downstream processing is to produce a highly purified final product from the complex fermentation broth in an efficient manner.
The document discusses downstream processing in biotechnology. It describes the key stages of downstream processing as solid-liquid separation, concentration, purification and formulation. Solid-liquid separation techniques discussed include centrifugation, filtration and membrane filtration. Concentration techniques include evaporation, liquid-liquid extraction, aqueous two-phase systems and membrane filtration. Membrane filtration techniques like microfiltration, ultrafiltration and reverse osmosis are described for concentration and purification. Disruption methods for releasing intracellular products include mechanical, chemical and enzymatic methods.
Crystallization and whole broth processing are important industrial techniques. Crystallization involves forming solid crystals from a solution, melt, or vapor and is widely used in pharmaceutical and chemical purification. It allows isolation of products with high purity at low cost. Whole broth processing recovers metabolites directly from unfiltered fermentation broth using methods like ion exchange resins, dialysis, expanded-bed adsorption, or resin absorption to minimize inhibitory effects during fermentation. Common equipment for crystallization includes tank crystallizers and forced circulation crystallizers.
Cell disruption is the process of breaking open cell walls to extract intracellular fluid and components without damaging them. The goal is an effective disruption while keeping products active. Methods include mechanical techniques like bead beating, blending, and homogenization which use physical force. Non-mechanical techniques involve freeze-thawing, osmotic shock, chemicals, enzymes, or electricity to disrupt cell walls and membranes in different ways. The optimal method depends on cell type and desired outcome.
Upstream bioprocessing involves steps like isolation and selection of microorganisms, media preparation, inoculation and incubation. Downstream bioprocessing involves steps like product harvesting, extraction, purification, quality control and packaging. Major upstream steps are formulation of fermentation medium, sterilization, inoculum preparation and fermentation. Downstream steps include cell disruption, solid-liquid separation, concentration, purification, formulation and quality monitoring. The overall process aims to isolate the desired product from fermentation broth in pure form through various unit operations.
Centrifugation is a process that uses centrifugal force to separate particles or molecules based on their size, shape, or density. It involves spinning a sample in a centrifuge to separate it into its components. There are various types of centrifugation classified based on speed, temperature, or separation method including differential, isopycnic, sucrose gradient, and ultracentrifugation. Centrifugation has many applications in industries like pharmaceuticals, water treatment, and oil extraction as well as in research areas like biochemistry and molecular biology.
The document discusses inoculum development and production media for industrial fermentation. It defines inoculum as a culture of microbes used to inoculate production-scale fermentations. Successful fermentations require developing inoculum to an active, healthy state in appropriate density. The document outlines factors that affect fermentation and discusses various media components like carbon sources, nitrogen sources, and trace elements. It also covers inoculum development methods for bacterial and mycelial cultures, preservation techniques, examples of media used for specific inocula, and criteria for a good inoculum.
The document discusses upstream processing in biomanufacturing. Upstream processing involves growing cells in bioreactors to produce target proteins for pharmaceuticals. Key aspects of upstream processing include media preparation and sterilization, inoculum development, and cell culture in bioreactors. The main goal of upstream processing is to provide optimal environmental conditions for cell growth and protein production before downstream processing separates and purifies the target proteins.
Centrifugation principle and types by Dr. Anurag YadavDr Anurag Yadav
concept of cnetrifugation,
basic Principle
centrifugal force
types of centrifugation based on use and rotor type
application of the each type of centrifuge
Ultracentrifuge in detail
application in general
The document provides an overview of selective downstream processing. It discusses the key stages of downstream processing including pretreatment, primary separation, and purification. Pretreatment involves cell separation techniques like filtration and centrifugation as well as cell disruption methods such as high-pressure homogenization and enzymatic lysis. Primary separation techniques covered are solvent extraction and salting out. Purification is discussed at a high level with a brief mention of chromatography. The document is presented by a group for a class on biochemical engineering.
Strain improvement Part II, Generation of mutants producing high level of pri...Renu Jaisinghani
This presentation, describes about various mutants that can be generated by carrying out process of mutation, so that high yielding mutants can be obtained that can be used for industrial production of primary metabolite.
This document discusses screening techniques used to isolate microorganisms of interest from a population. It describes primary screening as an initial process to discard many non-useful microbes while detecting a small percentage that may have industrial applications. Secondary screening further tests the capabilities of these isolated microorganisms to determine their real potential value. Some primary screening techniques mentioned include using crowded plates, detecting organic acid production, and screening for antibiotic production. The document also discusses improving crowded plate techniques and the goals and approaches of secondary screening to evaluate a microorganism's potential for industrial use.
For decades, cell lines have played a critical role in scientific developments. In most cases, researchers just got data generated from cell lines. However, due to some weaknesses of cell lines, scientists become increasingly cautious about these generated results. But now the game has changed! Primary cells now are believed to be a more biologically relevant tool than cell lines for studying human and animal biology. And we design this primary cell culture guide aimed at showing new investigators the basic principles of primary cell and some practical culture skills.
This document discusses various methods for cell disruption to release intracellular products, including physical methods like ultrasonication, osmotic shock, heat shock, and high pressure homogenization. It also covers chemical methods using alkalis, organic solvents, and detergents, as well as enzymatic methods using lysozyme. Several factors influence the effectiveness of these disruption techniques.
Downstream processing is an important step in the production of various industrial products. It involves the recovery and purification of products from fermentation broth. The first step is typically solid-liquid separation to remove cells and cell debris. This can be done through filtration, centrifugation, or precipitation. For intracellular products, cells must then be disrupted through physical, chemical, or enzymatic methods to release the product. Further purification and concentration steps such as liquid-liquid extraction, chromatography, crystallization are then used to obtain the final purified product. Proper selection of downstream processing methods depends on factors like the product properties and desired degree of purification.
The document discusses the key stages in downstream processing as part of bio manufacturing or biosynthesis of products. It describes how downstream processing involves removing cells and impurities from fermentation broth to produce the final product. The main stages discussed are removal of insolubles, product isolation, product purification, and product polishing. Key operations at each stage include filtration, centrifugation, precipitation, crystallization, and lyophilization.
Cell Disruption Strategies in Downstream ProcessingIlika Kaushik
Various methods of Cell Disruption in Downstream Processing.
Physical, Chemical and Biological methods of disrupting cells in order to extract the cellular components after fermentation.
The document discusses various methods for disrupting cells and extracting intracellular products, including physical methods like bead mills and French presses that disrupt cell walls, chemical/physicochemical methods using detergents or solvents to destabilize membranes, and a biological method using enzymes like lysozyme. The physical methods are best for breaking cell walls while chemical methods target membranes, and combinations of methods are often used to disrupt both barriers for complete cell lysis and product extraction.
Centrifugation is a process which involves the use of the centrifugal force for the sedimentation of heterogeneous mixtures to separate the two miscible substances ,and also to analyze the hydrodynamic properties of macro molecule with a centrifuge , used in industry and in laboratory setting.
This document discusses various techniques for obtaining pure microbial cultures, including streak plating, spread plating, and pour plating. It explains that pure cultures are essential for identifying microbes and their antibiotic susceptibilities. The document outlines the historical development of these techniques from the late 19th century work of Koch and Loeffler to more modern methods like the micro-inoculation culture technique.
The document summarizes key aspects of upstream processing in fermentation. The upstream process includes culture isolation and screening to obtain desired microorganisms, inoculum preparation using increasing media volumes to actively grow cultures, and media formulation and sterilization. Primary screening qualitatively determines which microorganisms can produce compounds of interest, while secondary screening characterizes industrially important organisms and determines yield potentials under different conditions to select microbes suitable for industrial use. Important steps in inoculum preparation and considerations for media composition like carbon, nitrogen, minerals and growth factors are also outlined.
This document provides an overview of downstream processing in biotechnology. It discusses the key steps involved which include: 1) cell disruption to release intracellular products, 2) clarification to remove cells and debris, 3) concentration of the product stream, 4) purification which may involve multiple steps such as extraction and crystallization, and 5) final product formulation. Specific techniques are described at each step, for example centrifugation and filtration for clarification, evaporation and ultrafiltration for concentration, and liquid-liquid extraction, crystallization, and various types of chromatography for purification. The goal of downstream processing is to produce a highly purified final product from the complex fermentation broth in an efficient manner.
The document discusses downstream processing in biotechnology. It describes the key stages of downstream processing as solid-liquid separation, concentration, purification and formulation. Solid-liquid separation techniques discussed include centrifugation, filtration and membrane filtration. Concentration techniques include evaporation, liquid-liquid extraction, aqueous two-phase systems and membrane filtration. Membrane filtration techniques like microfiltration, ultrafiltration and reverse osmosis are described for concentration and purification. Disruption methods for releasing intracellular products include mechanical, chemical and enzymatic methods.
The document discusses various techniques used in downstream processing (DSP) for solid-liquid separation of biomaterials from fermentation broth, including: flocculation, flotation, filtration, and centrifugation. Flocculation involves adding salts to induce cells to stick together and sediment. Flotation introduces gas bubbles to adsorb cells and float them to the surface. Filtration separates biomass using filters of varying pore sizes. Centrifugation exploits density differences to separate solids from liquids. Membrane filters and rotary drum filters are commonly used filtration methods.
This document summarizes key steps in the bioseparation process for recovering intracellular products from cell culture. Primary steps include cell harvesting using centrifugation or filtration to remove extracellular liquid, followed by cell disruption to release the intracellular product. Cell debris is then removed through centrifugation or filtration. For soluble products, centrifugation or filtration is used to separate the product from cell debris. For insoluble products forming inclusion bodies, centrifugation separates the denser inclusion bodies from lighter cell debris. Further purification steps may include product extraction, adsorption, or expanded bed adsorption chromatography.
This document summarizes key steps in the bioseparation process for recovering intracellular products from cell culture. Primary steps include cell harvesting using centrifugation or filtration to remove extracellular liquid, followed by cell disruption to release the intracellular product. Cell debris is then removed through centrifugation or filtration. For soluble products, centrifugation or filtration is used to separate the product from cell debris. For insoluble products forming inclusion bodies, centrifugation separates the denser inclusion bodies from lighter cell debris. Further purification steps may include product extraction, adsorption, or expanded bed adsorption chromatography.
This document discusses various methods for releasing intracellular products from cells, including physical, chemical, and enzymatic methods. Physical methods include ultrasonication, osmotic shock, heat shock, high pressure homogenization, impingement, and grinding with glass beads. Chemical methods involve using alkalis, organic solvents, and detergents. Enzymatic methods commonly use lysozyme. After release, concentration techniques such as evaporation, liquid-liquid extraction, membrane filtration, precipitation, and adsorption are used to remove water and achieve product concentration. Chromatography is also discussed as an effective purification technique.
The document discusses various strategies for recovery and purification of bio-products from fermentation broth. It describes key unit operations like solid-liquid separation techniques like filtration, centrifugation and flocculation to remove cells and debris. Further purification techniques involve precipitation, solvent extraction, ultrafiltration to concentrate and purify the product. Final processing includes crystallization, drying techniques like lyophilization and spray drying to package the purified product. Cell disruption methods including homogenization, bead mills and ultrasonication are also summarized to release intracellular components.
Membrane based water purification technology(ultra filteration,dialysis and e...Sanjeev Singh
This is made by keeping in mind needy students who want to know water purification technology.This slide contain brief description about membrane,ultra filtration,dialysis,electro dialysis.For further topic check my updates regularly....... .At last i would like to thanks those students who downloaded this slide.
Filtrasi is a separation method used to separate solid particles suspended in a fluid by passing the fluid through a porous medium that retains the solid particles. During filtration, the solid particles accumulate on the filter medium forming a filter cake that increases in thickness and resistance over time. There are different types of filtration equipment that operate using different principles like pressure, vacuum, or gravity depending on the application and amount of material being filtered. Common applications of filtration include separating brewed coffee from grounds using a paper filter, removing dust and particles from air using HEPA filters, and purifying water and sewage at municipal treatment plants.
The document discusses various methods for isolating and preserving microorganisms in pure culture. To isolate microbes, common methods include streak plating, pour plating, and serial dilution. Maintaining pure cultures long-term involves subculturing to fresh media periodically or preservation through lyophilization, low-temperature storage, or overlaying cultures with mineral oil. Lyophilization involves freeze-drying microbes under vacuum to remove water and stop metabolic activity, allowing long-term viability.
This document discusses subcellular fractionation, which is the process of separating intact organelles from homogenized cells and tissues using differential centrifugation. It begins by introducing the cell and its organelles. It then covers the history of the technique, methods for homogenizing cells, and the two main centrifugation methods - differential and density gradient centrifugation. Marker enzymes are also discussed as a way to identify isolated organelles. The summary provides an overview of the multi-step centrifugation process and identifies marker enzymes for different organelle fractions.
This document discusses three separation techniques: dialysis, ultrafiltration, and lyophilization. Dialysis uses a semi-permeable membrane to separate molecules based on molecular weight, allowing small molecules to pass through while retaining larger ones. Ultrafiltration concentrates solutions using membranes that retain proteins while allowing water and small molecules to pass through under pressure. Lyophilization, or freeze drying, removes water from a frozen sample by sublimation under vacuum, leaving a dry powder.
Centrifugation uses centrifugal force to separate particles in a solution based on properties like density. Centrifuges are used for various purposes including separating blood components in laboratories, isolating cell organelles through cell fractionation, and separating uranium isotopes for nuclear programs. The cell fractionation process involves disrupting cells, filtering out large particles, and purifying organelles through high-speed centrifugation. Centrifuges also have commercial applications such as removing water from laundry, separating cream from milk, and processing materials in various industries.
The document discusses downstream processing techniques used to recover and purify products from fermentation processes. It covers various unit operations used such as filtration, flocculation, and centrifugation. Filtration techniques discussed include batch filters like plate and frame filters and pressure leaf filters. Continuous filters described are rotary vacuum filters. Cross-flow filtration is also mentioned. The goal of downstream processing is to separate and purify metabolites of interest from fermentation broth in an efficient manner.
This document discusses membrane technologies used for wastewater treatment. It begins with an introduction to membranes and then discusses several membrane processes used for wastewater treatment including reverse osmosis, forward osmosis, electrodialysis, membrane bioreactors, and pervaporation. It also discusses hybrid membrane processes and membrane modules, focusing on plate and frame, tubular, spiral wound, and hollow fiber modules. Concentration polarization and membrane fouling are also covered along with pretreatment strategies to reduce fouling.
This document discusses cell disruption techniques used in downstream processing of fermentation broths. It explains that downstream processing typically begins with separating cells via filtration or centrifugation. The next step depends on if the desired product is intracellular, extracellular, or periplasmic. If intracellular, cell disruption is required to extract the product. Common cell disruption techniques include mechanical methods like bead mills, high pressure homogenization, ultrasonication; physical methods like freeze-thaw, osmotic shock; and chemical/enzymatic methods using detergents, solvents, or enzymes. The selection of disruption method depends on factors like the cell type, product stability, and cost-effectiveness.
This document describes an experimental setup for dead end membrane filtration. It includes descriptions of the equipment used such as a stirred cell, membrane, pressure vessel, and digital balance. It also provides details on installing the equipment, experimental procedures for clean water resistance and fouling tests, and equations to model membrane transport mechanisms. The goal of the experiment is to study dead end membrane filtration using this laboratory setup.
This document discusses methods for harvesting microalgae cells using gravity assisted ultrasound. It begins with background on microalgae properties and conventional harvesting methods like sedimentation, centrifugation, flocculation, and flotation. It then reviews acoustic-assisted harvesting techniques, including ultrasonic laminar flow filtration, cross-flow filtration, mesh filtration, and sedimentation. The document proposes using an ultrasound-assisted inclined gravity settler to concentrate algae cells suspended in an aqueous growth media and exit in two streams - one concentrated and one clarified. It will measure concentration of inlet and outlet streams to analyze performance.
This document discusses biochemistry of carcinogens and cancer. It begins with definitions of cancer and carcinogens. It then compares the characteristics of normal cells versus cancer cells. Cancer cells do not die, stop reproducing, or specialize like normal cells. Statistics on common cancers in the US and Saudi Arabia are provided. Tumors are abnormal cell growths that can be benign or malignant. Malignant tumors are cancerous. The document discusses topics like anaplasia, tumorigenesis, cell differentiation, and apoptosis in relation to cancer development.
This document provides an overview of cell cycle regulation and control. It discusses:
1) How multicellular organisms coordinate cell division across tissues through regulating the timing and rates of cell division.
2) The cell cycle phases (interphase and mitosis) and checkpoints (G1/S, G2/M, spindle) that ensure DNA replication and chromosome separation occur correctly.
3) Factors that control the cell cycle, including cyclins, cyclin-dependent kinases (Cdks), and growth factors, which promote or inhibit cell division through phosphorylation. Cancer occurs when these control mechanisms fail.
The document discusses pairwise sequence alignment and dynamic programming algorithms for computing optimal alignments. It covers:
- Assumptions of sequence evolution including substitutions, insertions, deletions, duplications, and domain reuse.
- Using sequence comparison to discover functional and evolutionary relationships by identifying similar sequences and orthologs with similar functions.
- The dot plot method for discovering sequence similarity by plotting sequences against each other in a matrix and identifying diagonals of matches.
- Dynamic programming algorithms that compute the optimal alignment score in quadratic time and linear space by breaking the problem into overlapping subproblems.
- Extensions of the basic algorithm to handle affine gap penalties by introducing three matrices to track alignments ending in matches, gaps
This document provides an overview of cell cycle regulation and control. It discusses:
1) How multicellular organisms coordinate cell division across tissues through regulating the timing and rates of cell division.
2) The cell cycle phases (interphase and mitosis) and checkpoints (G1/S, G2/M, spindle) that ensure DNA replication and chromosome separation occur correctly.
3) Factors that control the cell cycle, including cyclins, cyclin-dependent kinases (Cdks), and growth factors, which promote or inhibit cell division through phosphorylation. Cancer occurs when these control mechanisms fail.
The document discusses regulation of the cell cycle through cyclins, CDKs, and ubiquitin ligases. It covers the four phases of the cell cycle (G1, S, G2, M), regulation of DNA replication and mitosis, checkpoints that ensure quality control, and mechanisms that propel quiescent cells into the cell cycle in response to mitogens. The precise ordering and timing of cell cycle events is controlled by the periodic synthesis and degradation of cyclins and other regulatory proteins.
Unit operations are fundamental steps that make up chemical and bioprocess industries. They involve simple operations like mixing, separation, and heat and mass transfer that can be used across different manufacturing processes. In bioprocesses, upstream processing involves growing cells and preparing media, fermentation is the production stage, and downstream processing separates and purifies the desired product from the fermentation broth using multiple unit operations like filtration, centrifugation, and chromatography. Research aims to improve cell cultures, reactors, monitoring techniques, and downstream purification methods.
Proteins are multifunctional biomolecules that perform diverse roles in the body. They are involved in metabolism, structure and support, transport, regulation, and motion. Proteins are made of amino acid monomers that join together via peptide bonds to form polypeptide chains which fold into complex three-dimensional shapes dictated by their primary, secondary, tertiary, and sometimes quaternary structures. A protein's structure determines its specific function, such as enzymes catalyzing reactions, collagen providing structure, or hemoglobin transporting oxygen.
Electro magnetic radiation principles.pdfssusera1eccd
The document discusses principles of electromagnetic radiation relevant to remote sensing. It describes how energy from the sun interacts with the atmosphere and earth's surface, and is then detected by remote sensors. It explains that electromagnetic radiation can be modeled as waves or particles. The wave model describes properties like wavelength and frequency, while the particle model describes radiation as photons with energy proportional to frequency. The document also outlines the electromagnetic spectrum and different processes involved in electromagnetic radiation like reflection, refraction, and scattering in the atmosphere.
Empowering ACOs: Leveraging Quality Management Tools for MIPS and BeyondHealth Catalyst
Join us as we delve into the crucial realm of quality reporting for MSSP (Medicare Shared Savings Program) Accountable Care Organizations (ACOs).
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Hypertension and it's role of physiotherapy in it.Vishal kr Thakur
This particular slides consist of- what is hypertension,what are it's causes and it's effect on body, risk factors, symptoms,complications, diagnosis and role of physiotherapy in it.
This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
Here is summary of hypertension -
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This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
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DSP Steps elaboration ppt.pdf
1. Dr. Preeti Rawat
E-mail ID: prawat2k@gmail.com
Assistant Professor
Department of Botany
Deshbandhu College
Class: B.Sc. (Hons) Botany, VI Semester
Paper: Industrial and Environmental Microbiology
Unit 3: Microbial production of industrial products
Topics: Downstream processing and uses:
Filtration
Centrifugation
Cell disruption
Solvent extraction
Precipitation and ultrafiltration
Lyophilization
Spray drying
2. Five stages in downstream processing after Fermentation:
1. Solid-Liquid Separation
2. Release of Intracellular Products
3. Concentration
4. Purification by Chromatography and
5. Formulation.
Fermentation - Down Stream Processing
2
3. Stage 1: Solid-Liquid Separation:
• The first step in product recovery is the separation of whole cells (cell biomass) and other
insoluble ingredients from the culture broth (Note: If the desired product is an intracellular
metabolite, it must be released from the cells before subjecting to solid-liquid separation).
• Some authors use the term harvesting of microbial cells for the separation of cells from the
culture medium.
• Several methods are in used for solid-liquid separation, these are:
1. Flotation
2. Flocculation
3. Filtration
4. Centrifugation
3
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4. 1. Flotation:
When a gas is introduced into the liquid broth, it forms bubbles. The cells and other solid
particles get adsorbed on gas bubbles. These bubbles rise to the foam layer which can be
collected and removed. The presence of certain substances, referred to as collector
substances, facilitates stable foam formation e.g., long chain fatty acids, amines.
2. Flocculation:
In flocculation, the cells (or cell debris) form large aggregates to settle down for easy removal.
The process of flocculation depends on the nature of cells and the ionic constituents of the
medium. Addition of flocculating agents (inorganic salt, organic polyelectrolyte, mineral
hydrocolloid) is often necessary to achieve appropriate flocculation.
3. Filtration:
Filtration is the most commonly used technique for separating the biomass and culture
filtrate. The efficiency of filtration depends on many factors— the size of the organism,
presence of other organisms, viscosity of the medium, and temperature. Several filters such as
depth filters, absolute filters, rotary drum vacuum filters and membrane filters are in use.
4
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5. i). Depth Filters:
They are composed of a filamentous matrix such as glass wool, asbestos or filter paper. The
particles are trapped within the matrix and the fluid passes out. Filamentous fungi can be
removed by using depth filters.
ii). Absolute Filters:
These filters are with specific pore sizes that are smaller than the particles to be removed.
Bacteria from culture medium can be removed by absolute filters.
iii). Rotary Drum Vacuum Filters:
These filters are frequently used for separation of broth containing 10-40% solids (by volume)
and particles in the size of 0.5-10µm. Rotary drum vacuum filters have been successfully used
for filtration of yeast cells and filamentous fungi. The equipment is simple with low power
consumption and is easy to operate. The filtration unit consists of a rotating drum partially
immersed in a tank of broth (Fig. 20.2). As the drum rotates, it picks up the biomass which gets
deposited as a cake on the drum surface. This filter cake can be easily removed. 5
Fermentation - Down Stream Processing
7. iv) Membrane Filters:
In this type of filtration, membranes with specific pore sizes can be used. However, clogging of
filters is a major limitation. There are two types of membrane filtrations—static filtration and
cross-flow filtration (Fig. 20.3). In cross-flow filtration, the culture broth is pumped in a
crosswise fashion across the membrane. This reduces the clogging process and hence better
than the static filtration.
7
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8. Types of filtration processes:
There are 3 major types of filtrations based on the particle sizes and other characters (table
20.1). These are:
1. Microfiltration
2. Ultrafiltration
3. Reverse osmosis.
8
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9. 4. Centrifugation:
• The technique of centrifugation is based on the principle of density differences between
the particles to be separated and the medium. Thus, centrifugation is mostly used for
separating solid particles from liquid phase (fluid/particle separation).
• Unlike the centrifugation that is conveniently carried out in the laboratory scale, there are
certain limitations for large scale industrial centrifugation. However, in recent years,
continuous flow industrial centrifuges have been developed. There is a continuous feeding
of the slurry and collection of clarified fluid, while the solids deposited can be removed
intermittently.
• The different types of centrifuges are depicted in Fig. 20.4, and briefly described
hereunder.
9
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10. i) Tubular bowl centrifuge (Fig. 20.4A):
This is a simple and a small centrifuge, commonly used in pilot plants. Tubular bowl centrifuge
can be operated at a high centrifugal speed, and can be run in both batch or continuous mode.
The solids are removed manually.
10
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11. ii) Disc centrifuge (Fig. 20.4B):
It consists of several discs that separate the bowl into settling zones. The feed/slurry is fed
through a central tube. The clarified fluid moves upwards while the solids settle at the lower
surface.
iii) Multi-chamber centrifuge (Fig. 20.4C):
This is basically a modification of tubular bowl type of centrifuge. It consists of several
chambers connected in such a way that the feed flows in a zigzag fashion. There is a variation
in the centrifugal force in different chambers. The force is much higher in the periphery
chambers, as a result smallest particles settle down in the outermost chamber.
iv) Scroll centrifuge or decanter (Fig. 20.4D):
It is composed of a rotating horizontal bowl tapered at one end. The decanter is generally used
to concentrate fluids with high solid concentration (biomass content 5-80%). The solids are
deposited on the wall of the bowl which can be scrapped and removed from the narrow end.
11
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12. Stage 2. Release of Intracellular Products:
• As already stated, there are several biotechnological products (vitamins, enzymes) which
are located within the cells (intracellular). Such compounds have to be first released
(maximally and in an active form) for their further processing and final isolation.
• The microorganisms or other cells can be disintegrated or disrupted by physical, chemical
or enzymatic methods. The outline of different techniques used for breakage of cells is
given in Fig. 20.5.
• The selection of a particular method depends on the nature of the cells, since there
is a wide variation in the property of cell disruption or breakage.
12
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14. Cell Disruption:
1. Physical methods of cell disruption:
i) Ultra sonication:
Ultrasonic disintegration is widely employed in the laboratory. However, due to high cost, it is
not suitable for large-scale use in industries.
ii) Osmotic shock:
This method involves the suspension of cells (free from growth medium) in 20% buffered
sucrose. The cells are then transferred to water at about 4°C. Osmotic shock is used for the
release of hydrolytic enzymes and binding proteins from Gram-negative bacteria.
iii) Heat shock (thermolysis):
Breakage of cells by subjecting them to heat is relatively easy and cheap. But this technique
can be used only for a very few heat-stable intracellular products.
14
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15. iv) High pressure homogenization:
This technique involves forcing of cell suspension at high pressure through a very narrow
orifice to come out to atmospheric pressure. This sudden release of high pressure creates a
liquid shear that can break the cells.
v) Impingement:
In this procedure, a stream of suspended cells at high velocity and pressure are forced to hit
either a stationary surface or a second stream of suspended cells (impinge literally means to
strike or hit). The cells are disrupted by the forces created at the point of contact. Micro
fluidizer is a device developed based on the principle of impingement. It has been successfully
used for breaking E. coli cells. The advantage with impingement technique is that it can be
effectively used for disrupting cells even at a low concentration.
15
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16. vi) Grinding with glass beads:
• The cells mixed with glass beads are subjected to a very high speed in a reaction vessel.
The cells break as they are forced against the wall of the vessel by the beads. Several
factors influence the cell breakage-size and quantity of the glass beads, concentration and
age of cells, temperature and agitator speed. Under optimal conditions, one can expect a
maximal breakage of about 80% of the cells.
• A diagrammatic representation of a cell disrupter employing glass beads is shown in Fig.
20.6. It contains a cylindrical body with an inlet, outlet and a central motor-driven shaft. To
this shaft are fitted radial agitators. The cylinder is fitted with glass beads. The cell
suspension is added through the inlet and the disrupted cells come out through the outlet.
The body of the cell disrupter is kept cool while the operation is on.
16
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17. Mechanical and non-mechanical methods:
• Among the physical methods of cell disruption described above, ultra sonication, high-
pressure homogenization, impingement and grinding with glass beads are mechanical
while osmotic shock and heat shock are non-mechanical.
• The chemical and enzymatic methods (described below) are non-mechanical in nature.
17
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18. 2. Chemical methods of cell disruption:
Treatment with alkalies, organic solvents and detergents can lyse the cells to release the
contents.
i) Alkalies:
Alkali treatment has been used for the extraction of some bacterial proteins. However, the
alkali stability of the desired product is very crucial for the success of this method e.g.,
recombinant growth hormone can be efficiently released from E. coli by treatment with
sodium hydroxide at pH 11.
ii) Organic solvents:
Several water miscible organic solvents can be used to disrupt the cells e.g., methanol,
ethanol, isopropanol, butanol. These compounds are inflammable; hence require specialised
equipment for fire safety. The organic solvent toluene is frequently used. It is believed that
toluene dissolves membrane phospholipids and creates membrane pores for release of
intracellular contents. 18
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19. iii) Detergents:
Detergents that are ionic in nature, cationic-cetyl trimethyl ammonium bromide (CTAB) or
anionic-sodium lauryl sulfate (SLS) can denature membrane proteins and lyse the cells. Non-
ionic detergents (although less reactive than ionic ones) are also used to some extent e.g.,
Triton X-100 or Tween. The problem with the use of detergents is that they affect purification
steps, particularly the salt precipitation. This limitation can be overcome by using
ultrafiltration or ion-exchange chromatography for purification.
19
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20. 3. Enzymatic methods of cell disruption:
• Cell disruption by enzymatic methods has certain advantages i.e., lysis of cells occurs under
mild conditions in a selective manner. This is quite advantageous for product recovery.
• Lysozyme is the most frequently used enzyme and is commercially available (produced
from hen egg white). It hydrolyses β-1, 4-glycosidic bonds of the mucopeptide in bacterial
cell walls. The Gram- positive bacteria (with high content of cell wall mucopeptides) are
more susceptible for the action of lysozyme.
• For Gram-negative bacteria, lysozyme in association with EDTA can break the cells. As the
cell wall gets digested by lysozyme, the osmotic effects break the periplasmic membrane to
release the intracellular contents.
• Certain other enzymes are also used, although less frequently, for cell disruption. For the
lysis of yeast cell walls, glucanase and mannanase in combination with proteases are used.
•
Combination of methods:
In order to increase the efficiency of cell disintegration in a cost-effective manner, a
combination of physical, chemical and enzymatic methods is employed.
20
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21. Stage 3. Concentration:
• The filtrate that is free from suspended particles (cells, cell debris etc.) usually contains 80-
98% of water. The desired product is a very minor constituent. The water has to be
removed to achieve the product concentration.
• The commonly used techniques for concentrating biological products are:
1. Evaporation
2. Liquid-liquid extraction
3. Membrane filtration
4. Precipitation
5. Adsorption.
• The actual procedure adopted depends on the nature of the desired product (quality and
quantity to be retained as far as possible) and the cost factor.
21
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22. 1. Evaporation:
• Water in the broth filtrate can be removed by a simple evaporation process. The
evaporators, in general, have a heating device for supply of steam, and unit for the
separation of concentrated product and vapour, a condenser for condensing vapour,
accessories and control equipment.
• Some of the important types of evaporators in common use are briefly described:
i) Plate evaporators:
The liquid to be concentrated flows over plates. As the steam is supplied, the liquid gets
concentrated and becomes viscous.
ii) Falling film evaporators:
In this case, the liquid flows down long tubes which gets distributed as a thin film over the
heating surface. Falling film evaporators are suitable for removing water from viscous products
of fermentation. 22
Fermentation - Down Stream Processing
23. iii) Forced film evaporators:
The liquid films are mechanically driven and these devices are suitable for producing dry
product concentrates.
iv) Centrifugal forced film evaporators:
These equipment evaporate the liquid very quickly (in seconds), hence suitable for
concentrating even heat-labile substances. In these evaporators, a centrifugal force is used to
pass on the liquid over heated plates or conical surfaces for instantaneous evaporation.
23
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24. 2. Liquid-Liquid Extraction:
The concentration of biological products can be achieved by transferring the desired product
(solute) from one liquid phase to another liquid phase, a phenomenon referred to as liquid-
liquid extraction. Besides concentration, this technique is also useful for partial purification of
a product.
The efficiency of extraction is dependent on the partition coefficient i.e. the relative
distribution of a substance between the two liquid phases. The process of liquid-liquid
extraction may be broadly categorized as extraction of low molecular weight products and
extraction of high molecular weight products.
• Extraction of low molecular weight products:
By using organic solvents, the lipophilic compounds can be conveniently extracted.
However, it is quite difficult to extract hydrophilic compounds. Extraction of lipophilic
products can be done by the following techniques:
24
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25. i) Physical extraction:
The compound gets itself distributed between two liquid phases based on the physical
properties. This technique is used for extraction of non-ionising compounds.
ii) Dissociation extraction:
This technique is suitable for the extraction of ionisable compounds. Certain antibiotics can be
extracted by this procedure.
iii) Reactive extraction:
In this case, the desired product is made to react with a carrier molecule (e.g., phosphorus
compound, aliphatic amine) and extracted into organic solvent. Reactive extraction procedure
is quite useful for the extraction of certain compounds that are highly soluble in water
(aqueous phase) e.g., organic acids.
25
Fermentation - Down Stream Processing
26. iv. Supercritical fluid (SCF) extraction:
This technique differs from the above procedures, since the materials used for extraction are
supercritical fluids (SCFs). SCFs are intermediates between gases and liquids and exist as fluids
above their critical temperature and pressure. Supercritical CO2, with a low critical
temperature and pressure is commonly used in the extraction. Supercritical fluid extraction is
rather expensive, hence not widely used (SCF has been used for the extraction of caffeine
from coffee beans, and pigments and flavor ingredients from biological materials).
26
Fermentation - Down Stream Processing
27. • Extraction of high molecular weight compounds:
Proteins are the most predominant high molecular weight products produced in fermentation
industries. Organic solvents cannot be used for protein extraction, as they lose their biological
activities. They are extracted by using an aqueous two-phase systems or reverse micelles
formation.
i) Aqueous two-phase systems (ATPS):
They can be prepared by mixing a polymer (e.g., polyethylene glycol) and a salt solution
(ammonium sulfate) or two different polymers. Water is the main component in ATPS, but the
two phases are not miscible. Cells and other solids remain in one phase while the proteins are
transferred to other phase. The distribution of the desired product is based on its surface and
ionic character and the nature of phases. The separation takes much longer time by ATPS.
ii) Reverse miceller systems:
Reverse micelles are stable aggregates of surfactant molecules and water in organic solvents.
The proteins can be extracted from the aqueous medium by forming reverse micelles. In fact,
the enzymes can be extracted by this procedure without loss of biological activity.
27
Fermentation - Down Stream Processing
28. 3. Membrane Filtration:
• Membrane filtration has become a common separation technique in industrial
biotechnology. It can be conveniently used for the separation of biomolecules and
particles, and for the concentration of fluids.
• The membrane filtration technique basically involves the use of a semipermeable
membrane that selectively retains the particles/molecules that are bigger than the pore
size while the smaller molecules pass through the membrane pores.
• Membranes used in filtration are made up of polymeric materials such as polyethersulfone
and polyvinyl di-fluoride. It is rather difficult to sterilize membrane filters.
• In recent years, micro-filters and ultrafiIters composed of ceramics and steel are available.
Cleaning and sterilization of such filters are easy.
• The other types of membrane filtration techniques are described briefly.
28
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29. • Membrane adsorbers:
They are micro- or macro porous membranes with ion exchange groups and/or affinity ligands.
Membrane adsorbers can bind to proteins and retain them. Such proteins can be eluted by
employing solutions in chromatography.
• Pervaporation:
This is a technique in which volatile products can be separated by a process of permeation
through a membrane coupled with evaporation. Pervaporation is quite useful for the
extraction, recovery and concentration of volatile products. However, this procedure has a
limitation since it cannot be used for large scale separation of volatile products due to cost
factor.
• Perstraction:
This is an advanced technique working on the principle of membrane filtration coupled with
solvent extraction. The hydrophobic compounds can be recovered/ concentrated by this
method. 29
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30. 4. Precipitation:
• Precipitation is the most commonly used technique in industry for the concentration of
macromolecules such as proteins and polysaccharides.
• Precipitation technique can also be employed for the removal of certain unwanted
byproducts e.g. nucleic acids, pigments.
• Neutral salts, organic solvents, high molecular weight polymers (ionic or non-ionic), besides
alteration in temperature and pH are used in precipitation.
• In addition to these non-specific protein precipitation reactions (i.e. the nature of the
protein is unimportant), there are some protein specific precipitations e.g., affinity
precipitation, ligand precipitation.
30
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31. i) Neutral salts:
The most commonly used salt is ammonium sulfate, since it is highly soluble, nontoxic to
proteins and low-priced. Ammonium sulfate increases hydrophobic interactions between
protein molecules that result in their precipitation. The precipitation of proteins is dependent
on several factors such as protein concentration, pH and temperature.
ii) Organic solvents:
Ethanol, acetone and propanol are the commonly used organic solvents for protein
precipitation. They reduce the dielectric constant of the medium and enhance electrostatic
interaction between protein molecules that lead to precipitation. Since proteins are denatured
by organic solvents, the precipitation process has to be carried out below 0°C.
iii) Non-ionic polymers:
Polyethylene glycol (PEG) is a high molecular weight non-ionic polymer that can precipitate
proteins. It reduces the quantity of water available for protein solvation and precipitates
protein. PEG does not denature proteins, besides being non-toxic.
iv) Ionic polymers:
The charged polymers such as polyacrylic acid and polyethyleneimine are used. They form
complexes with oppositely charged protein molecules that causes charge neutralisation and
precipitation.
v) Increase in temperature:
The heat sensitive proteins can be precipitated by increasing the temperature.
31
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32. vi) Change in pH:
Alterations in pH can also lead to protein precipitation.
vii) Affinity precipitation:
The affinity interaction (e.g., between antigen and antibody) is exploited for precipitation of
proteins.
Viii) Precipitation by ligands:
Ligands with specific binding sites for proteins have been successfully used for selective
precipitation.
5. Adsorption:
The biological products of fermentation can be concentrated by using solid adsorbent
particles. In the early days, activated charcoal was used as the adsorbent material. In recent
years, cellulose-based adsorbents are employed for protein concentration.
And for concentration of low molecular weight compounds (vitamins, antibiotics, peptides)
polystyrene, methacrylate and acrylate based matrices are used. The process of adsorption
can be carried out by making a bed of adsorbent column and passing the culture broth
through it. The desired product, held by the adsorbent, can be eluted. 32
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33. Stage 4: Purification by Chromatography:
• The biological products of fermentation (proteins, pharmaceuticals, diagnostic compounds
and research materials) are very effectively purified by chromatography.
• Chromatography is basically an analytical technique dealing with the separation of closely
related compounds from a mixture. Chromatography usually consists of a stationary phase
and mobile phase.
• The stationary phase is the porous solid matrix packed in a column (equilibrated with a
suitable solvent) on to which the mixture of compounds to be separated is loaded. The
compounds are eluted by a mobile phase.
• A single mobile phase may be used continuously or it may be changed appropriately to
facilitate the release of desired compounds. The eluate from the column can be monitored
continuously (e.g. protein elution can be monitored by ultraviolet adsorption at 280 nm),
and collected in fractions of definite volumes.
33
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34. The different types of chromatography techniques used for separation (mainly proteins) along
with the principles are given in Table 20.2. A large number of matrices are commercially
available for purification of proteins e.g., agarose, cellulose, polyacrylamide, porous silica,
cross- linked dextran, polystyrene. Some of the important features of selected
chromatographic techniques are briefly described.
34
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35. i) Gel-filtration chromatography:
This is also referred to as size-exclusion chromatography. In this technique, the separation of
molecules is based on the size, shape and molecular weight. The sponge-like gel beads with
pores serve as molecular sieves for separation of smaller and bigger molecules. A solution
mixture containing molecules of different sizes (e.g. different proteins) is applied to the
column and eluted.
The smaller molecules enter the gel beads through their pores and get trapped. On the other
hand, the larger molecules cannot pass through the pores and therefore come out first with
the mobile liquid (Fig. 20.7). At the industrial scale, gel-filtration is particularly useful to
remove salts and low molecular weight compounds from high molecular weight products.
35
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36. ii) Ion-exchange chromatography:
It involves the separation of molecules based on their surface charges. Ion-exchangers are of
two types (cation- exchangers which have negatively charged groups like carboxymethyl and
sulfonate, and anion- exchangers with positively charged groups like diethylaminoethyl (DEAE).
The most commonly used cation-exchangers are Dowex HCR and Amberlite IR, the anion-
exchangers are Dowex SAR and Amberlite IRA.
In ion-exchange chromatography, the pH of the medium is very crucial, since the net charge
varies with pH. In other words, the pH determines the effective charge on both the target
molecule and the ion-exchanger. The ionic bound molecules can be eluted from the matrix by
changing the pH of the eluant or by increasing the concentration of salt solution. Ion-exchange
chromatography is useful for the purification of antibiotics, besides the purification of
proteins.
36
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37. iii) Affinity chromatography:
This is an elegant method for the purification of proteins from a complex mixture. Affinity
chromatography is based on an interaction of a protein with an immobilized ligand. The ligand
can be a specific antibody, substrate, substrate analogue or an inhibitor. The immobilized
ligand on a solid matrix can be effectively used to fish out complementary structures.
In Table 20.3, some examples of ligands used for the purification of proteins are given. The
protein bound to the ligand can be eluted by reducing their interaction. This can be achieved
by changing the pH of the buffer, altering the ionic strength or by using another free ligand
molecule. The fresh ligand used has to be removed in the subsequent steps.
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Fermentation - Down Stream Processing
38. Stage 5. Formulation:
• Formulation broadly refers to the maintenance of activity and stability of a
biotechnological products during storage and distribution.
• The formulation of low molecular weight products (solvents, organic acids) can be achieved
by concentrating them with removal of most of the water. For certain small molecules,
(antibiotics, citric acid), formulation can be done by crystallization by adding salts.
• Proteins are highly susceptible for loss of biological activity; hence their formulation
requires special care. Certain stabilizing additives are added to prolong the shelf life of
protein.
• The stabilizers of protein formulation include sugars (sucrose, lactose), salts (sodium
chloride, ammonium sulfate), polymers (polyethylene glycol) and polyhydric alcohols
(glycerol).
• Proteins may be formulated in the form of solutions, suspensions or dry powders.
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Fermentation - Down Stream Processing
39. 1. Drying:
Drying is an essential component of product formulation. It basically involves the transfer of
heat to a wet product for removal of moisture. Most of the biological products of fermentation
are sensitive to heat, and therefore require gentle drying methods. Based on the method of
heat transfer, drying devices may be categorized as contact, convection, radiation dryers.
These three types of dryers are commercially available.
2. Spray drying:
Spray drying is used for drying large volumes of liquids. In spray drying, small droplets of liquid
containing the product are passed through a nozzle directing it over a stream of hot gas. The
water evaporates and the solid particles are left behind.
3. Freeze-drying/ Lyophilization
Freeze-drying or lyophilization is the most preferred method for drying and formulation of a
wide-range of products—pharmaceuticals, foodstuffs, diagnostics, bacteria, viruses. This is
mainly because freeze-drying usually does not cause loss of biological activity of the desired
product.
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Fermentation - Down Stream Processing
40. Lyophilization is based on the principle of sublimation of a liquid from a frozen state. In the
actual technique, the liquid containing the product is frozen and then dried in a freeze-dryer
under vacuum. The vacuum can now be released and the product containing vials can be
sealed e.g., penicillin can be freeze dried directly in ampules.
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Fermentation - Down Stream Processing
Source: http://www.biologydiscussion.com/biotechnology/downstream-processing/stages-in-
downstream-processing-5-stages/10160