This document discusses different methods for immobilizing whole cells, including perfusion bioreactors and biofilm formation. Perfusion bioreactors culture cells continuously over long periods by feeding fresh media and removing waste, while various separation methods like hollow fiber membranes or centrifuges keep cells in the bioreactor. Perfusion offers advantages like improved product quality, smaller reactor size, and lower costs compared to traditional fed-batch systems. The document also covers immobilizing cells through entrapment in polymers, attachment to surfaces, or passive biofilm formation on supports.
This PPT dicusses about the Stirred Tank Bioreactor and its features mainly used in Fermentation process.
Useful for students doing their Bachelor's in Life Science
This PPT dicusses about the Stirred Tank Bioreactor and its features mainly used in Fermentation process.
Useful for students doing their Bachelor's in Life Science
Microbial Kinetics in Batch Culture
Culture system containing a limited amount of nutrient, which is inoculated with the microorganism. Cells grow until some component is exhausted or until the environment changes so as to inhibit growth. Biomass concentration defined in terms of cell dry weight measurements (g/l) or total cell number (cells/ml).
Lineweaver-Burke Equation.....We remember the Monod Equation
Invert…
The equation now has the form of a straight line with intercept.
Y = MX + C
By plotting as a function of
You get a straight line, where the slope is , and the y–axis intercept is .
Product Yield Coefficient
Maintenance:
Cells use energy and raw materials for two functions, production of new cells and the maintenance of existing cells. In general, consumption of materials for maintenance is small w.r.t. the amount of materials used in the synthesis of new biomass.
Generally it is assumed that the use of materials for maintenance is proportional to the amount of cells present.
Bioreactors for animal cell suspension cultureGrace Felciya
1. Types of culture
2. Techniques of cultivating animal cell
3. suspension culture/ Non anchorage dependent
4. Bioreactor consideration
5. Requirements of Bioreactor
6. Reactors used in cultivation
The heart of the fermentation or bioprocess technology is the Fermentor or Bioreactor. A bioreactor is basically a device in which the organisms are cultivated to form the desired products. it is a containment system designed to give right environment for optimal growth and metabolic activity of the organism.
A fermentor usually refers to the containment system for the cultivation of prokaryotic cells, while a bioreactor grows the eukaryotic cells (mammalian, insect cells, etc).
The immobilization of whole cells can be defined as “the physical confinement or localization of intact cells to a certain region of space, without loss of desired biological activity.”
In other words, cell immobilization means to freeze an entire cell in a state of suspended animation, such that its metabolism stops and hence does not die.
Biological films are the multilayer growth of cells on solid support surfaces ; community of micro-organisms enclosed in a polymeric matrix and adhered on inert or living surface
These attached cells are embedded in a self-produced exopolysaccharide matrix, and exhibit different growth and bioactivity compared with suspended cells.
Biofilm consists of three components:
microorganism, extracellular polymeric substances (EPS),
surface for attachment.
The excreted polymeric substances hold the biofilm together and cement it to a surface.
The thickness of a biofilm is an important factor affecting the performance of the biotic phase.
Thin biofilms - low rates of conversion due to low biomass concentration.
Thick biofilms - may experience diffusionally limited growth, which may or may not be beneficial depending on the cellular system and objectives
Microbial Kinetics in Batch Culture
Culture system containing a limited amount of nutrient, which is inoculated with the microorganism. Cells grow until some component is exhausted or until the environment changes so as to inhibit growth. Biomass concentration defined in terms of cell dry weight measurements (g/l) or total cell number (cells/ml).
Lineweaver-Burke Equation.....We remember the Monod Equation
Invert…
The equation now has the form of a straight line with intercept.
Y = MX + C
By plotting as a function of
You get a straight line, where the slope is , and the y–axis intercept is .
Product Yield Coefficient
Maintenance:
Cells use energy and raw materials for two functions, production of new cells and the maintenance of existing cells. In general, consumption of materials for maintenance is small w.r.t. the amount of materials used in the synthesis of new biomass.
Generally it is assumed that the use of materials for maintenance is proportional to the amount of cells present.
Bioreactors for animal cell suspension cultureGrace Felciya
1. Types of culture
2. Techniques of cultivating animal cell
3. suspension culture/ Non anchorage dependent
4. Bioreactor consideration
5. Requirements of Bioreactor
6. Reactors used in cultivation
The heart of the fermentation or bioprocess technology is the Fermentor or Bioreactor. A bioreactor is basically a device in which the organisms are cultivated to form the desired products. it is a containment system designed to give right environment for optimal growth and metabolic activity of the organism.
A fermentor usually refers to the containment system for the cultivation of prokaryotic cells, while a bioreactor grows the eukaryotic cells (mammalian, insect cells, etc).
The immobilization of whole cells can be defined as “the physical confinement or localization of intact cells to a certain region of space, without loss of desired biological activity.”
In other words, cell immobilization means to freeze an entire cell in a state of suspended animation, such that its metabolism stops and hence does not die.
Biological films are the multilayer growth of cells on solid support surfaces ; community of micro-organisms enclosed in a polymeric matrix and adhered on inert or living surface
These attached cells are embedded in a self-produced exopolysaccharide matrix, and exhibit different growth and bioactivity compared with suspended cells.
Biofilm consists of three components:
microorganism, extracellular polymeric substances (EPS),
surface for attachment.
The excreted polymeric substances hold the biofilm together and cement it to a surface.
The thickness of a biofilm is an important factor affecting the performance of the biotic phase.
Thin biofilms - low rates of conversion due to low biomass concentration.
Thick biofilms - may experience diffusionally limited growth, which may or may not be beneficial depending on the cellular system and objectives
Suspension Culture and Single Cell Cultures, Culturing methods, maintenance a...Ananya Sinha
Suspension Culture and Single Cell Cultures, Culturing methods, maintenance and application
Generally, suspension culture is a one stop technology to produce secondary metabolites on a large scale in-vitro, irrespective of the climatic condition or nutrient availability (as required in field plants).
In this presentation, we will see the importance of suspension culture, culturing methods and it's application (mostly with respect to plants) and also focus on what exactly is a single cell culture.
Bioreactors are essential in tissue
engineering, not only because they provide an
in vitro environment mimicking in vivo conditions
for the growth of tissue substitutes, but also
because they enable systematic studies of the
responses of living tissues to various mechanical
and biochemical cues.
introduction to microbial growth.
different types of growth.
different types of cultivation .
m.sc microbiology, m.sc biotech
batch, fed-batch cultivation , continous cultivation, chemostat and turbidostat
synchronous growth and diauxic growth
The presentation gives overview of production of secondary metabolites using callus culture as well as tissue culture techniques. Various batch and continuous culturing process are described on the basis of secondary metabolite to be synthesised.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
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Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
A workshop hosted by the South African Journal of Science aimed at postgraduate students and early career researchers with little or no experience in writing and publishing journal articles.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
2. Fed-batch bioreactors
• Traditional fed-batch bioreactor systems consist of tanks
that are usually between 10,000-25,000 liters. Cells are
cultured in batches that typically run between 7-21 days by
which time media nutrients have been consumed and toxic
waste has begun to accumulate. During the run, cells
secrete the protein of interest into the media and at the
end of the run the protein is separated from cell mass as a
batch. Typical product yields are in the range of 1 to 4
grams per liter depending on the clone and antibody. While
regular improvements have moved product yield from
under 1 gram per liter to where they are now, it has not
improved other issues in fed batch manufacturing including
large manufacturing footprints and challenges with
scalability.
3. Perfusion systems
• In contrast, perfusion bioreactors culture cells over
much longer periods, even months, by continuously
feeding the cells with fresh media and removing spent
media while keeping cells in culture. In perfusion
there are different ways to keep the cells in culture
while removing spent media. One way is to keep the
cells in the bioreactor by using capillary fibers or
membranes, which the cells bind to. Another does not
bind the cells, but rather relies on filtration systems
that keep the cells in the bioreactor while allowing
the media to be removed.
4. • Another method is the use of a centrifuge to separate cells and
return them to the bioreactor.
• EXAMPLES OF CELL SEPARATION METHODS:
• GE Healthcare’s Hollow Fiber Microfiltration Cartridges – “In this
system, the retentate consists of the cells, which flow past the
membrane and are sent back to the bioreactor. The spent
medium is the permeate that passes through the membrane.”
• ATMI’s iCELLis Single Use Fixed Bed – In this system, cells are
bound to custom microcarriers, which allows cells to stay in place
while media flows around them.
• Centrifuge method – In this system, a centrifuge is used to
separate cells from culture media and then cells are returned to
the bioreactor.
•
5.
6. Advantages of Perfusion systems
• PRODUCT QUALITY AND STABILITY :
By continuously removing spent media
and replacing it with new media, nutrient levels are
maintained for optimal growing conditions and cell
waste product is removed to avoid toxicity. In addition,
the product is regularly removed before being
exposed to excessive waste that causes protein
degradation. Product is also harvested and purified
much more quickly, which is particularly helpful when
producing a product that is unstable.
7. • SCALABILITY
perfusion bioreactors are smaller in size and can produce
the same product yield in less space. Typically perfusion
bioreactors operate at 10-30x concentrations compared to
fed-batch bioreactors. For example, it has been shown that
a 50-liter perfusion bioreactor can produce the same yield
as a 1,000-liter fed-batch bioreactor. Therefore, the use of
perfusion should enable the replacement of typical 10,000
L bioreactors with 1,000L bioreactors without negatively
impacting the yearly yield of manufactured product.
•
8. • COST SAVINGS
perfusion bioreactors require less on
utilities cost and they are less labor intensive
to operate. Thus requiring significantly less
capital investment on the front end and less
on operating costs to manufacture the same
yield as fed-batch bioreactors.
9. • REMOVAL OF COMPONENTS:
potential removal of cell debris and
inhibitory by-products, removal of enzymes
released by dead cells that may destroy
product.
10. Disadvantages of Perfusion systems
• Large amount of medium used.
• Nutrients in the medium are less completely
usedd than in batch 0r fed-batch systems.
• High cost of rawmaterials.
• High cost for waste treatment
11. Immobilization of cells
INTRODUCTION :
common method : “ immobilization of cells
as biocatalysts”
• Cell immobilization can be defined as
entrapment or localization of living cells to a
certain region of space with preservation of their
metabolic and/or catabolic activity.
• Cell immobilization improves the efficiency of
the cultures by mimicking cell natural
environment.
12. Advantages of immobilised cell
cultures over suspension culture
• Provides high cell concentration
• Allows cell reuse and reduces cost of cell recovery and
cell recycle
• Eliminates cell wash out problems at high dilutions.
• High volumetric productivity = high cell concentration
+ high flow rates
• Provides favourable microenvironental conditions for
cells which leads to better performance of
biocatalysts.
• Improves genetic stability in some cases.
• Protection against shear damage for some cells.
13. Limitations of immobilization
• Product of interest should be excreated by
the cell
• It often leads to system for which diffusional
limitations are important.
• Control of microenvironmental culture is
difficult
• They can lead to mechanical disruption of
immobilizing matrix
14. Active immobilisation of cells
• Entrapment of cells in gel or behind semi-permeable membranes
is the most popular method for immobilization of plant cells.
• Some polymers used to entrap plant cells are alginate, agar,
agarose and carrageenan. Of these, alginate has been most
widely used because it can be polymerized at room temperature
using Ca 2+.
• Polyurethane foam has also been used to immobilize a range of
plant cells. Alternatively, plant cells can be entrapped by inclusion
within membrane reactors.
• A semi-permeable membrane is introduced between the cells
and the recirculating medium so that the cells can be packed at a
very high density under very mild conditions. Some designs of
membrane reactors are shown in Figure.
15. Fig A: Flat plate membrane reactor with
one side flow of nutrients
Fig B: Flat plate membrane reactor
with two side flow of nutrients
Fig C:Multi membrane reactor system
16. • Immobilization of cells on the surface of an inert
support, such as fibreglass mats and unwoven short
fibre polyester, has also been examined for in vitro
production of secondary metabolites.
• For surface immobilization of cells, a bioreactor (air
lift or mechanically agitated design), provided with
the support matrix, is inoculated with a plant cell
suspension of suitable density and operated for an
initial period as a suspension bioreactor. During this
period virtually all cells spontaneously adhere to the
surface of the support.
17.
18.
19. Advantages
Special advantage of this method over the other
methods of immobilization of cells is the absence of
any physical restriction to mass transfer between the
culture medium and the biomass surface.
Since the surface immobilized cells grow on the
surface of the support matrix, it should facilitate
visual monitoring of the conditions, distribution and
extent of the biomass and to routinely sample the
biomass, if desired.
20. PASSIVE IMMOBILIZATION:
BIOLOGICAL FILMS
• Biological films are the multilayer growth of cells
on solid support surfaces.
• The support material can be insert or biologically
active.
• Biofilm formation is common in natural and
industrial fermentation systems, such as
biological waste-water treatment and mold
fermentation.
• The interaction among cells and the binding
forces between the cell and support material may
be very complicated.
21. In mixed-culture microbial films;
• The presence of some polymer-producing organisms
facilitates biofilm formation and enhances the stability of
the biofilms.
• Micro environmental conditions inside a thick biofilm vary
with position and affect the physiology of the cells.
In a stagnant biological film;
• Nutrients diffuse into the biofilm and products diffuse out
into liquid nutrient medium.
• Nutrient and product profiles within the biofilm are
important factors affecting cellular physiology and
metabolism.
• Biofilm cultures have almost the same advantages as those
of the immobilized cell systems over suspension cultures.
22.
23. Thickness of a biofilm:-
The thickness of the biofilm is an important
factor affecting the performance of the biotic
phase.
Thin biofilms – will have low rates of
conversion due to low biomass concentration
Thick biofilms – May experience diffusionally
limited growth, which may or may not be
beneficial depending on the cellular system and
objectives. Nutrient-depleted regions may also
develop within the biofilm for thick biofilms.
24. • In many cases, an optimal biofilm thickness resulting
in the maximum rate of bioconversion exists and can
be determined.
• In some cases,growth under diffusion limitations
may result in higher yields of products as a result of
changes in cell physiology and cell-cell interactions.
• In this case, improvement in reaction stoichiometey
(e.g., high yield) may overcome the reduction in
reaction rate, and it may be more beneficial to
operate the system under diffusion limitations.
• Usually, the most sparingly soluble nutrient, such as
dissolved oxygen, is the rate-limiting nutrient within
the biofilm.