The document discusses suspensions, including definitions, classifications, properties, advantages, disadvantages, formulation methods, components, and equipment used. A suspension is a heterogeneous system with small insoluble particles dispersed uniformly throughout a liquid medium. Suspensions can be classified based on physical state, proportion of solids, particle behavior, size, and application (oral, topical, parenteral). Key aspects in formulation include reducing particle size, selecting suspending agents, wetting agents, and structured vehicles. Common equipment used are mortar and pestle, mechanical stirrers, colloid mills, homogenizers, and ultrasonic devices.
Elixirs are clear, sweetened liquids containing flavoring substances or active medicinal agents dissolved in water and alcohol. Their primary ingredients include alcohol, water, glycerin, preservatives, sorbital, and flavoring agents. There are two main types - non-medicated elixirs which contain no therapeutic agents, and medicated elixirs which contain active drug ingredients dissolved in the liquid. Elixirs are formulated to be stable, clear solutions and are quality controlled through tests such as measuring alcohol concentration and viscosity. They are commonly used to deliver and mask the taste of other drugs.
The document discusses parenterals, which are sterile preparations intended for administration through layers of skin or mucous membranes. It defines parenterals and outlines their advantages like 100% bioavailability and ability to administer to unconscious patients. The document also discusses the various routes of parenteral administration, types of parenterals like powders, solutions, and emulsions. It describes the formulation, layout, and quality control testing of parenterals. Specifically, it provides details on the areas involved in parenteral production, types of small and large volume parenterals, and common quality tests like leaker, clarity, pyrogenic, sterility, and content uniformity testing.
This document provides information about emulsions, including their definition, advantages, types, tests for identification, classification, formulation, preparation, stability, and differences from suspensions. Key points include:
- An emulsion is a biphasic liquid dosage form with one liquid dispersed as fine globules in another immiscible liquid, stabilized by an emulsifying agent.
- Emulsions can improve palatability, protect unstable drugs, and aid in drug absorption.
- The main types are oil-in-water and water-in-oil emulsions, classified based on the dispersed and continuous phases.
- Emulsion stability depends on factors like emulsifying agent, preservation, antioxidants, and
This document discusses various types of liquid dosage forms including pharmaceutical solutions, galenicals, decoctions, infusions, percolations, douches, enemas, gargles, washes, juices, sprays, sweeteners, honey, mucilage, jellies, and non-aqueous solutions. Pharmaceutical solutions are homogenous mixtures that can be aqueous or non-aqueous depending on the solubility of the drug. Various extraction and preparation methods are covered for obtaining active ingredients from plants into liquid forms. The uses and formulations of different oral and topical liquid medications are also outlined.
Pharmaceutical suspensions... a brief reviewbk fatima
This document provides information on suspensions, including:
- Definitions of suspensions and their advantages over other dosage forms.
- Classification of suspensions based on factors like concentration, particle size, and sedimentation.
- Guidelines for formulating stable suspensions, such as using suspending agents and controlling flocculation.
- Methods for evaluating properties of suspensions like sedimentation, viscosity, and particle size over time to assess stability.
- Common suspending agents used to increase viscosity and prevent caking or sedimentation.
This document provides information about semisolid dosage forms such as ointments, pastes, and jellies. It defines semisolids as topical dosage forms used for therapeutic, protective, or cosmetic purposes. The key ingredients in semisolids include a base, preservatives, humectants, antioxidants, emulsifiers, gelling agents, permeation enhancers, and buffers. The document discusses the ideal properties of bases and lists common bases such as petrolatum, lanolin, and polyethylene glycol. It also covers the advantages and disadvantages of semisolid dosage forms.
Pharmaceutical suspension can be classified based on the dispersed phase, vehicle used, proportion of solid particles, particle size, etc. They can be stabilized using suspending agents, viscosity increasing agents, surface charge, etc. Recent advances include nano suspensions to improve solubility, taste masked suspensions to improve palatability, and sustained release suspensions to reduce dosing frequency. Evaluation methods include sedimentation studies, rheological measurements, and zeta potential determination.
Elixirs are clear, sweetened liquids containing flavoring substances or active medicinal agents dissolved in water and alcohol. Their primary ingredients include alcohol, water, glycerin, preservatives, sorbital, and flavoring agents. There are two main types - non-medicated elixirs which contain no therapeutic agents, and medicated elixirs which contain active drug ingredients dissolved in the liquid. Elixirs are formulated to be stable, clear solutions and are quality controlled through tests such as measuring alcohol concentration and viscosity. They are commonly used to deliver and mask the taste of other drugs.
The document discusses parenterals, which are sterile preparations intended for administration through layers of skin or mucous membranes. It defines parenterals and outlines their advantages like 100% bioavailability and ability to administer to unconscious patients. The document also discusses the various routes of parenteral administration, types of parenterals like powders, solutions, and emulsions. It describes the formulation, layout, and quality control testing of parenterals. Specifically, it provides details on the areas involved in parenteral production, types of small and large volume parenterals, and common quality tests like leaker, clarity, pyrogenic, sterility, and content uniformity testing.
This document provides information about emulsions, including their definition, advantages, types, tests for identification, classification, formulation, preparation, stability, and differences from suspensions. Key points include:
- An emulsion is a biphasic liquid dosage form with one liquid dispersed as fine globules in another immiscible liquid, stabilized by an emulsifying agent.
- Emulsions can improve palatability, protect unstable drugs, and aid in drug absorption.
- The main types are oil-in-water and water-in-oil emulsions, classified based on the dispersed and continuous phases.
- Emulsion stability depends on factors like emulsifying agent, preservation, antioxidants, and
This document discusses various types of liquid dosage forms including pharmaceutical solutions, galenicals, decoctions, infusions, percolations, douches, enemas, gargles, washes, juices, sprays, sweeteners, honey, mucilage, jellies, and non-aqueous solutions. Pharmaceutical solutions are homogenous mixtures that can be aqueous or non-aqueous depending on the solubility of the drug. Various extraction and preparation methods are covered for obtaining active ingredients from plants into liquid forms. The uses and formulations of different oral and topical liquid medications are also outlined.
Pharmaceutical suspensions... a brief reviewbk fatima
This document provides information on suspensions, including:
- Definitions of suspensions and their advantages over other dosage forms.
- Classification of suspensions based on factors like concentration, particle size, and sedimentation.
- Guidelines for formulating stable suspensions, such as using suspending agents and controlling flocculation.
- Methods for evaluating properties of suspensions like sedimentation, viscosity, and particle size over time to assess stability.
- Common suspending agents used to increase viscosity and prevent caking or sedimentation.
This document provides information about semisolid dosage forms such as ointments, pastes, and jellies. It defines semisolids as topical dosage forms used for therapeutic, protective, or cosmetic purposes. The key ingredients in semisolids include a base, preservatives, humectants, antioxidants, emulsifiers, gelling agents, permeation enhancers, and buffers. The document discusses the ideal properties of bases and lists common bases such as petrolatum, lanolin, and polyethylene glycol. It also covers the advantages and disadvantages of semisolid dosage forms.
Pharmaceutical suspension can be classified based on the dispersed phase, vehicle used, proportion of solid particles, particle size, etc. They can be stabilized using suspending agents, viscosity increasing agents, surface charge, etc. Recent advances include nano suspensions to improve solubility, taste masked suspensions to improve palatability, and sustained release suspensions to reduce dosing frequency. Evaluation methods include sedimentation studies, rheological measurements, and zeta potential determination.
This document provides information on various monophasic liquid dosage forms including gargles, mouthwashes, throat paints, and syrups. It discusses the components, advantages, disadvantages, and methods of preparation for each type. Gargles are aqueous solutions used to treat throat infections that are prepared by dissolving ingredients in solvents. Mouthwashes are solutions used for oral hygiene that can be cosmetic or therapeutic. Throat paints are viscous liquids applied to the mouth and throat to treat infections. Syrups are concentrated sugar solutions that can also contain medication, providing a pleasant way to administer liquid drugs. The document outlines the typical ingredients and formulations for each monophasic liquid dosage form.
These are the substances which are added in the formulation along the therapeutic agent so as to impart specific qualities in the formulation.
These are have very little or no therapeutic value but are necessary in the manufacture of various dosage forms.
Purposes served by Additives:
Provide bulk to the formulation.
Facilitate drug absorption or solubility and other pharmacokinetic considerations.
Aid in handling of “API” during manufacturing .
Provide stability and prevent from denaturation etc
Elixirs are clear, sweetened alcoholic solutions intended for oral use. They contain 10-12% alcohol which helps dissolve ingredients. Elixirs differ from syrups in that alcohol is always present in elixirs and they remain clear while syrups can contain dyes. Common types of elixirs include simple non-medicated elixirs and medicated elixirs containing active ingredients. Elixirs are prepared by separately dissolving water and alcohol soluble components before combining the solutions and adding excipients like sweeteners, flavors, and preservatives.
Granules are aggregations of fine powder particles that are roughly spherical in shape. They are produced to improve powder flowability, enhance compressibility, reduce toxicity, and prevent caking. There are three main granulation methods: wet granulation, dry granulation, and granulation by crystallization. Wet granulation is most common and involves mixing powder with a liquid to form a paste, then granulating and drying the paste. Granules are sieved after drying to achieve a uniform size distribution suitable for their intended use as a final or intermediate pharmaceutical product. Quality tests such as dissolution and friability are performed to ensure granule properties are suitable.
A co solvent system is one in which a water miscible or partially miscible organic solvent is mixed with water to form a modified aqueous solution. And the phenomenon called Cosolvency
cosolvents have some degree of hydrogen bond donating and or hydrogen bond accepting ability as well as small hydrocarbon regions.
The resulting solution will have physical properties that are intermediate to that of the pure organic solvent and water through the reduction of water–water interaction.
This document provides an overview of pharmaceutical emulsions. It defines emulsions as dispersions of one liquid in another immiscible liquid, stabilized by an emulsifying agent. The key topics covered include the classification of emulsions as oil-in-water or water-in-oil, theories of emulsification, common emulsifying agents like surfactants and hydrocolloids, and factors affecting the stability of emulsions such as flocculation and creaming. Pharmaceutical applications of emulsions include lotions, creams, and ointments.
An excipient is a pharmacologically inactive substance formulated along with the active pharmaceutical ingredient to provide bulk, improve solubility and stability, aid manufacturing, and enhance the finished dosage form. Excipients include fillers, binders, disintegrants, coatings, lubricants, glidants, preservatives, antioxidants, flavorings, colors, solvents, and buffers. Each excipient type has distinct purposes and properties to facilitate drug delivery and product performance.
A comprehensive interpretation of pellets based on their definitions, advantages, disadvantages, mechanism of pellet formation and growth, pelletization techniques, formulation requirements, and the equipment system for manufacture of pellets.
Ointment, cream, gel , pastes, plasters, glycerogelatinCristina Joy Reyes
Ointments, creams, gels, pastes, plasters, and glycerogelatins are different topical semisolid dosage forms. Ointments are semisolids for application to the skin or mucous membranes and can be medicated or unmedicated. Creams are emulsions that can be water-in-oil or oil-in-water. Gels are dispersions of molecules in an aqueous liquid made jelly-like with a gelling agent. Pastes are stiffer than ointments and contain more solids. Plasters are adhesive solid or semisolid masses spread on a backing. Glycerogelatins contain gelatin, glycerin, water,
This document provides information about pharmaceutical suspensions. It begins by defining a suspension as a disperse system where an insoluble solid internal phase is uniformly dispersed throughout an external liquid phase. Particle size is important for suspensions to be classified as coarse or colloidal. Suspensions differ from solutions in that particles remain dispersed rather than dissolving. Sedimentation occurs over time due to particle size and density. Suspending agents are added to prevent sedimentation by increasing viscosity. The document discusses formulation, applications, advantages, and disadvantages of suspensions.
Formulation and manufacturing of suspensions Dheeraj Saini
This document discusses the formulation and manufacturing of suspensions. It defines suspensions as preparations containing finely divided drug particles distributed uniformly throughout a vehicle. The document classifies suspensions based on their use, describes common formulation components like wetting agents and dispersing agents, and outlines the process for preparing suspensions including dispersion of drug particles, preparation of the structured vehicle, incorporation of the drug, deaeration, and homogenization. It provides examples of equipment used for homogenization such as rotor-stator homogenizers and ultrasonic homogenizers.
This document provides information on various liquid dosage forms including their descriptions, advantages, disadvantages and examples. It discusses liquid forms such as otic preparations, nasal preparations, syrups, elixirs, tinctures, fluid extracts, douches, enemas, liniments, collodion, aromatic waters, spirits/essences, mouthwashes, gargles and astringents. For each type, it outlines what they are, how they are administered and common examples. The document is an informative reference for the different types of liquid dosage forms used in pharmaceutical preparations.
The document discusses suspensions, including definitions, classifications, properties, advantages, disadvantages, formulation methods, components, and general formulation procedures. Some key points:
- A suspension is a heterogeneous system with insoluble particles dispersed uniformly throughout a liquid medium. Suspending agents help maintain uniform dispersion.
- Suspensions can be classified based on physical state, proportion of solids, behavior of dispersed phase, particle size, and general type (oral, topical, parenteral).
- Important properties include easy redispersion, no sediment compaction, optimal viscosity, and stability.
- Common formulation methods are precipitation, dispersion, controlled flocculation, and use of structured vehicles. Key components are suspending
Aerosol , components for aerosol formulation by mariomakhter@yahoo.commariomS7
Aerosol are the products that depend on the power of a compressed or liquefied gas to expel the contents from the container. Aerosols are termed also pressurized package.
This lecture discusses pharmaceutical powders. It begins by defining a pharmaceutical powder as a solid dosage form containing finely divided drugs or chemicals meant for internal or external use. Powders permit drugs to be reduced to a very fine state, enhancing dissolution rate, absorption, and masking unpleasant tastes. The lecture then covers various types of powders including divided powders for internal use (simple, compound, cachet-enclosed), bulk powders (antacids, laxatives), and powders for external use. Methods for reducing particle size like trituration, pulverization, and levigation are also summarized.
Pharmaceutical aerosols are therapeutic active ingredients packaged in a pressurized system. They have advantages like direct delivery to affected areas without contamination. Aerosols consist of a propellant, container, valve, and product concentrate. Common propellants include hydrocarbons and gases. Containers must withstand high pressure and are often metal or glass. Valves meter doses and come in types like spray or foam. Formulations contain an active ingredient and propellant to achieve desired properties. Quality is ensured through testing of components, dosage, leakage and other parameters.
Capsules are solid dosage forms that enclose one or more active ingredients within a soluble shell, typically made of gelatin. There are two main types: hard-shelled capsules containing dry powders, and soft-shelled capsules used for oils. Capsules are manufactured through a process involving dipping pins in gelatin solutions to form the shells, drying, stripping from the pins, trimming, joining the cap and body portions, and polishing. Various sizes of empty capsules are commercially available. Capsules offer benefits like ease of swallowing and unit dosing but require specialized filling equipment for industrial production.
A detailed study on tablets, its classification, excipients, tablet granulation, methods of granulation, compression machines, equipment tooling and the problems that occur during the tablet manufacturing process. This presentation is based on the PCI syllabus for bpharm students of fifth semester.
This document discusses ointments, which are semisolid preparations intended for local or transdermal delivery of active substances for skin application. It defines ointments and describes their types, classifications based on penetration and therapeutic use, ideal properties of bases, methods of preparation including mechanical incorporation and fusion. It also discusses factors influencing dermal absorption such as skin and drug properties and the vehicle used. The document concludes that ointments have significant treatment potential and demand will continue to rise for dermatological products addressing skin diseases and protection.
1. Dry syrups are powder mixtures that require the addition of water at dispensing and are for pediatric use. They avoid stability issues like changes in viscosity, polymorphism, and caking seen in aqueous suspensions.
2. A dry syrup formulation contains suspending agents, wetting agents, preservatives, sweeteners, flavors, buffers, colors, and other excipients. It must form a uniform mixture upon reconstitution with water.
3. Dry syrups can be prepared by mixing powder blends or granulating ingredients with a wet granulation process and drying the granules. This provides a stable formulation that is easily reconstituted for pediatric patients.
This document provides information about a pharmaceutical suspension submitted by Rahul Raj, a B-Pharmacy student with roll number 045. It begins with an introduction that defines suspensions and classifies them based on physical state, proportion of solid particles, behavior of dispersed phase, size of dispersed particles, and general use. The document then discusses properties of well-formulated suspensions, advantages and disadvantages of suspensions, and various methods for formulating suspensions including precipitation, dispersion, controlled flocculation, and use of structured vehicles. It provides a general procedure for suspension formulation and includes flow charts. Finally, it details common formulation components such as suspending agents, wetting agents, surfactants, hydrophilic colloids, solvents
This document discusses pharmaceutical suspensions. It defines a suspension as a coarse dispersion containing finely divided insoluble material suspended in a liquid medium. Suspensions contain dispersed particles above the colloidal size of 1μm. Common examples include antacid, antibiotic, and analgesic oral suspensions. Suspensions are used for insoluble or poorly soluble drugs to provide liquid oral dosage forms. They can also be used topically, parenterally, and ophthalmically. Proper formulation requires the use of suspending agents, wetting agents, dispersing agents, and flocculating agents. Stability and routes of administration are also discussed.
This document provides information on various monophasic liquid dosage forms including gargles, mouthwashes, throat paints, and syrups. It discusses the components, advantages, disadvantages, and methods of preparation for each type. Gargles are aqueous solutions used to treat throat infections that are prepared by dissolving ingredients in solvents. Mouthwashes are solutions used for oral hygiene that can be cosmetic or therapeutic. Throat paints are viscous liquids applied to the mouth and throat to treat infections. Syrups are concentrated sugar solutions that can also contain medication, providing a pleasant way to administer liquid drugs. The document outlines the typical ingredients and formulations for each monophasic liquid dosage form.
These are the substances which are added in the formulation along the therapeutic agent so as to impart specific qualities in the formulation.
These are have very little or no therapeutic value but are necessary in the manufacture of various dosage forms.
Purposes served by Additives:
Provide bulk to the formulation.
Facilitate drug absorption or solubility and other pharmacokinetic considerations.
Aid in handling of “API” during manufacturing .
Provide stability and prevent from denaturation etc
Elixirs are clear, sweetened alcoholic solutions intended for oral use. They contain 10-12% alcohol which helps dissolve ingredients. Elixirs differ from syrups in that alcohol is always present in elixirs and they remain clear while syrups can contain dyes. Common types of elixirs include simple non-medicated elixirs and medicated elixirs containing active ingredients. Elixirs are prepared by separately dissolving water and alcohol soluble components before combining the solutions and adding excipients like sweeteners, flavors, and preservatives.
Granules are aggregations of fine powder particles that are roughly spherical in shape. They are produced to improve powder flowability, enhance compressibility, reduce toxicity, and prevent caking. There are three main granulation methods: wet granulation, dry granulation, and granulation by crystallization. Wet granulation is most common and involves mixing powder with a liquid to form a paste, then granulating and drying the paste. Granules are sieved after drying to achieve a uniform size distribution suitable for their intended use as a final or intermediate pharmaceutical product. Quality tests such as dissolution and friability are performed to ensure granule properties are suitable.
A co solvent system is one in which a water miscible or partially miscible organic solvent is mixed with water to form a modified aqueous solution. And the phenomenon called Cosolvency
cosolvents have some degree of hydrogen bond donating and or hydrogen bond accepting ability as well as small hydrocarbon regions.
The resulting solution will have physical properties that are intermediate to that of the pure organic solvent and water through the reduction of water–water interaction.
This document provides an overview of pharmaceutical emulsions. It defines emulsions as dispersions of one liquid in another immiscible liquid, stabilized by an emulsifying agent. The key topics covered include the classification of emulsions as oil-in-water or water-in-oil, theories of emulsification, common emulsifying agents like surfactants and hydrocolloids, and factors affecting the stability of emulsions such as flocculation and creaming. Pharmaceutical applications of emulsions include lotions, creams, and ointments.
An excipient is a pharmacologically inactive substance formulated along with the active pharmaceutical ingredient to provide bulk, improve solubility and stability, aid manufacturing, and enhance the finished dosage form. Excipients include fillers, binders, disintegrants, coatings, lubricants, glidants, preservatives, antioxidants, flavorings, colors, solvents, and buffers. Each excipient type has distinct purposes and properties to facilitate drug delivery and product performance.
A comprehensive interpretation of pellets based on their definitions, advantages, disadvantages, mechanism of pellet formation and growth, pelletization techniques, formulation requirements, and the equipment system for manufacture of pellets.
Ointment, cream, gel , pastes, plasters, glycerogelatinCristina Joy Reyes
Ointments, creams, gels, pastes, plasters, and glycerogelatins are different topical semisolid dosage forms. Ointments are semisolids for application to the skin or mucous membranes and can be medicated or unmedicated. Creams are emulsions that can be water-in-oil or oil-in-water. Gels are dispersions of molecules in an aqueous liquid made jelly-like with a gelling agent. Pastes are stiffer than ointments and contain more solids. Plasters are adhesive solid or semisolid masses spread on a backing. Glycerogelatins contain gelatin, glycerin, water,
This document provides information about pharmaceutical suspensions. It begins by defining a suspension as a disperse system where an insoluble solid internal phase is uniformly dispersed throughout an external liquid phase. Particle size is important for suspensions to be classified as coarse or colloidal. Suspensions differ from solutions in that particles remain dispersed rather than dissolving. Sedimentation occurs over time due to particle size and density. Suspending agents are added to prevent sedimentation by increasing viscosity. The document discusses formulation, applications, advantages, and disadvantages of suspensions.
Formulation and manufacturing of suspensions Dheeraj Saini
This document discusses the formulation and manufacturing of suspensions. It defines suspensions as preparations containing finely divided drug particles distributed uniformly throughout a vehicle. The document classifies suspensions based on their use, describes common formulation components like wetting agents and dispersing agents, and outlines the process for preparing suspensions including dispersion of drug particles, preparation of the structured vehicle, incorporation of the drug, deaeration, and homogenization. It provides examples of equipment used for homogenization such as rotor-stator homogenizers and ultrasonic homogenizers.
This document provides information on various liquid dosage forms including their descriptions, advantages, disadvantages and examples. It discusses liquid forms such as otic preparations, nasal preparations, syrups, elixirs, tinctures, fluid extracts, douches, enemas, liniments, collodion, aromatic waters, spirits/essences, mouthwashes, gargles and astringents. For each type, it outlines what they are, how they are administered and common examples. The document is an informative reference for the different types of liquid dosage forms used in pharmaceutical preparations.
The document discusses suspensions, including definitions, classifications, properties, advantages, disadvantages, formulation methods, components, and general formulation procedures. Some key points:
- A suspension is a heterogeneous system with insoluble particles dispersed uniformly throughout a liquid medium. Suspending agents help maintain uniform dispersion.
- Suspensions can be classified based on physical state, proportion of solids, behavior of dispersed phase, particle size, and general type (oral, topical, parenteral).
- Important properties include easy redispersion, no sediment compaction, optimal viscosity, and stability.
- Common formulation methods are precipitation, dispersion, controlled flocculation, and use of structured vehicles. Key components are suspending
Aerosol , components for aerosol formulation by mariomakhter@yahoo.commariomS7
Aerosol are the products that depend on the power of a compressed or liquefied gas to expel the contents from the container. Aerosols are termed also pressurized package.
This lecture discusses pharmaceutical powders. It begins by defining a pharmaceutical powder as a solid dosage form containing finely divided drugs or chemicals meant for internal or external use. Powders permit drugs to be reduced to a very fine state, enhancing dissolution rate, absorption, and masking unpleasant tastes. The lecture then covers various types of powders including divided powders for internal use (simple, compound, cachet-enclosed), bulk powders (antacids, laxatives), and powders for external use. Methods for reducing particle size like trituration, pulverization, and levigation are also summarized.
Pharmaceutical aerosols are therapeutic active ingredients packaged in a pressurized system. They have advantages like direct delivery to affected areas without contamination. Aerosols consist of a propellant, container, valve, and product concentrate. Common propellants include hydrocarbons and gases. Containers must withstand high pressure and are often metal or glass. Valves meter doses and come in types like spray or foam. Formulations contain an active ingredient and propellant to achieve desired properties. Quality is ensured through testing of components, dosage, leakage and other parameters.
Capsules are solid dosage forms that enclose one or more active ingredients within a soluble shell, typically made of gelatin. There are two main types: hard-shelled capsules containing dry powders, and soft-shelled capsules used for oils. Capsules are manufactured through a process involving dipping pins in gelatin solutions to form the shells, drying, stripping from the pins, trimming, joining the cap and body portions, and polishing. Various sizes of empty capsules are commercially available. Capsules offer benefits like ease of swallowing and unit dosing but require specialized filling equipment for industrial production.
A detailed study on tablets, its classification, excipients, tablet granulation, methods of granulation, compression machines, equipment tooling and the problems that occur during the tablet manufacturing process. This presentation is based on the PCI syllabus for bpharm students of fifth semester.
This document discusses ointments, which are semisolid preparations intended for local or transdermal delivery of active substances for skin application. It defines ointments and describes their types, classifications based on penetration and therapeutic use, ideal properties of bases, methods of preparation including mechanical incorporation and fusion. It also discusses factors influencing dermal absorption such as skin and drug properties and the vehicle used. The document concludes that ointments have significant treatment potential and demand will continue to rise for dermatological products addressing skin diseases and protection.
1. Dry syrups are powder mixtures that require the addition of water at dispensing and are for pediatric use. They avoid stability issues like changes in viscosity, polymorphism, and caking seen in aqueous suspensions.
2. A dry syrup formulation contains suspending agents, wetting agents, preservatives, sweeteners, flavors, buffers, colors, and other excipients. It must form a uniform mixture upon reconstitution with water.
3. Dry syrups can be prepared by mixing powder blends or granulating ingredients with a wet granulation process and drying the granules. This provides a stable formulation that is easily reconstituted for pediatric patients.
This document provides information about a pharmaceutical suspension submitted by Rahul Raj, a B-Pharmacy student with roll number 045. It begins with an introduction that defines suspensions and classifies them based on physical state, proportion of solid particles, behavior of dispersed phase, size of dispersed particles, and general use. The document then discusses properties of well-formulated suspensions, advantages and disadvantages of suspensions, and various methods for formulating suspensions including precipitation, dispersion, controlled flocculation, and use of structured vehicles. It provides a general procedure for suspension formulation and includes flow charts. Finally, it details common formulation components such as suspending agents, wetting agents, surfactants, hydrophilic colloids, solvents
This document discusses pharmaceutical suspensions. It defines a suspension as a coarse dispersion containing finely divided insoluble material suspended in a liquid medium. Suspensions contain dispersed particles above the colloidal size of 1μm. Common examples include antacid, antibiotic, and analgesic oral suspensions. Suspensions are used for insoluble or poorly soluble drugs to provide liquid oral dosage forms. They can also be used topically, parenterally, and ophthalmically. Proper formulation requires the use of suspending agents, wetting agents, dispersing agents, and flocculating agents. Stability and routes of administration are also discussed.
This document discusses pharmaceutical suspensions. It defines a suspension as a coarse dispersion containing finely divided insoluble material suspended in a liquid medium. Suspensions contain dispersed particles above the colloidal size of 1μm. Common examples include antacid, antibiotic, and analgesic oral suspensions. Suspensions are used for insoluble or poorly soluble drugs to provide liquid oral dosage forms. They can also be used topically, parenterally, and ophthalmically. Proper formulation requires the use of suspending agents, wetting agents, dispersing agents, and flocculating agents. Stability and routes of administration are also discussed.
This document provides information on pharmaceutical suspensions. It defines suspensions as dispersions containing finely divided insoluble material suspended in a liquid medium. Suspensions are used to deliver insoluble drugs or drugs that are poorly soluble or have unpleasant tastes. Some key applications of suspensions mentioned are for pediatric patients, increasing drug surface area, and controlling drug absorption rates. The document discusses formulation considerations like vehicle selection, stabilizers, and packaging. It also addresses the stability and routes of administration of suspensions.
This document discusses pharmaceutical suspensions, including their definition, classification, formulation, preparation, advantages, and disadvantages. A suspension is a biphasic system with solid particles dispersed uniformly throughout a liquid medium. Key points covered include the use of wetting agents, suspending agents, thickeners, buffers, coloring agents, and preservatives in formulation. Methods for preparation involve reducing particle size and using processes like precipitation, dispersion, and controlled flocculation to obtain a uniformly suspended product.
The document discusses pharmaceutical suspensions. Key points:
- Suspensions are heterogeneous systems with insoluble solid particles dispersed in a liquid medium, usually with particle sizes between 0.5-5 μm.
- They offer benefits like effective delivery of hydrophobic drugs and masking unpleasant tastes.
- Suspensions can incorporate higher drug concentrations than solutions.
- Proper formulation considers factors like sedimentation, viscosity, stability, and accurate dosing.
- Ingredients include wetting agents, suspending agents, preservatives, flavors, colors and buffers.
This document provides information about pharmaceutical suspensions. It defines a suspension as a dispersed system where one substance is distributed in particulate form throughout another. Suspensions are formulated for reasons such as insolubility, taste-masking, or controlled drug release. Key aspects of formulating suspensions include controlling particle size, using thickening agents to increase viscosity, and adding surfactants to improve wetting. Common thickening agents discussed are natural polysaccharides like acacia, tragacanth, and sodium alginate as well as semi-synthetic agents like methylcellulose and sodium carboxymethylcellulose.
-suspension (Pharmaceutical)
-definition of suspension
-types of suspension,
-examples of pharmaceutical
-suspension
-pharmaceutical application of suspension
-advantages of suspension
- disadvantages of suspension
-classification of suspension
-flocculated and deflocculated
-formulation additives
- methods of preparation
-formulation of suspension
Suspensions containing diffusible solids
Suspensions containing in diffusible solids
Suspensions containing poorly wettable solids
Suspensions of precipitate forming liquids
Suspensions produced by chemical reactions
- Packaging and storage
stability of suspension
- routes of administration of suspension
-evaluation of suspension
This document discusses stability factors and applications of pharmaceutical suspensions. It notes that small particle size, increasing viscosity, and maintaining optimal temperature contribute to suspension stability. Suspensions are used for insoluble drugs, to improve drug stability, and to mask unpleasant tastes. Key factors for stability include particle size, viscosity, temperature, surfactants, hydrophilic colloids, solvents, and proper mixing procedures.
Suspension is made of two phase system, consisting of a finely divided solid particles (Dispersed phase) distributed in a particular manner throughout another medium (Continuous phase).
This document discusses disperse systems, specifically suspensions. It defines suspensions as preparations containing finely divided drug particles distributed throughout a vehicle. Suspensions can be classified based on particle size (coarse vs fine), proportion of solid particles (dilute vs concentrated), electrokinetic properties, or intended route of administration (oral, topical, injectable). Key aspects of suspensions include maintaining proper particle size, using wetting agents, preventing sedimentation, and ensuring stability. The document provides examples of pharmaceutical suspensions and discusses their preparation, packaging, storage, and some extended-release options.
This document provides information about suspensions. It defines a suspension as a two-phase system with undissolved particles dispersed in a liquid. Suspensions have particle sizes between 0.5-5 microns. An ideal suspension is chemically stable and has particles that do not readily settle or form compact cakes. Suspensions are classified based on use, particle proportion, electrokinetic nature, and particle size. Key steps in formulation include addition of suspending agents and ensuring uniform particle dispersion.
INTRODUCTION, CLASSIFICATION, FORMULATION, PREPARATION METHOD, BENEFITS AND DISADVANTAGES, STORAGE
The physical chemist defines the word “suspension” as a two-phase system consisting of an undissolved or immiscible material dispersed in a vehicle (solid, liquid, or gas).
Suspension are generally taken orally or by parenteral route, and the suspensions meant for external use should have small particle size to avoid gritty feeling to the skin
The suspensions have dispersed particles above the colloidal size, which is 0.5–5 microns.
Based On Pharmaceutical Use
Oral suspension
Externally applied suspension
Parenteral suspension
Ophthalmic Suspension
Based On the proportion of solid particles
Dilute suspension (2 to10 10 percent; w/v solid)
Concentrated suspension (50 percent; w/v solid)
Based On Electrokinetic Nature Of Solid Particles
Flocculated suspension
Deflocculated suspension
Based On Size Of Solid Particles
Colloidal suspension (< 1 micron)
Coarse suspension (>1 micron)
Nano suspension (10 ng)
Oral Suspension
Topical Suspension
Parenteral Suspension
Ophthalmic Suspension
Suspending and thickening agents
Wetting Agents
Dispersing agent
Flocculating Agent
Preservative
Organoleptic Additives
Suspensions containing diffusible solids
Suspensions containing insoluble solids
Suspensions of precipitate-forming liquids
Suspensions produced by chemical reactions
A suspension is a biphasic system with solid particles uniformly dispersed in a liquid. Suspensions can be used orally, parenterally, or topically for patients who cannot swallow solid dosage forms. Key properties include small, uniform particle size; lack of settling or easy redispersibility; optimal viscosity; and stability. Suspensions are classified by particle aggregation (flocculated or deflocculated) and route of administration. Flocculating agents cause particles to aggregate into flocs. Proper formulation and manufacturing can overcome issues like sedimentation and dispersion of hydrophobic drugs.
A dispersion is a system in which distributed particles of one material are dispersed in a continuous phase of another material. The two phases may be in the same or different states of matter.
An excipient is a pharmacologically inactive/ inert substance formulated alongside the active pharmaceutical ingredient of a medication. Drug products contain both drug substance (commonly referred to as active pharmaceutical ingredient or API) and excipients.
The document discusses pharmaceutical suspensions. A suspension is a coarse dispersion where an insoluble internal phase is dispersed uniformly throughout an external phase. Reasons for formulating suspensions include insolubility of the drug, masking bitter taste, increasing stability, and achieving controlled drug release. Common types of suspensions include antacids, antibiotics, analgesics, anthelmintics, and antifungals. Suspending agents are used to prevent sedimentation and ensure uniform dosing. Preparation involves grinding the insoluble drug into a paste and incorporating suspending agents before making up the final volume. Advantages include improved stability and bioavailability for some drugs, while disadvantages include issues with physical stability and accurate dosing.
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9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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3. Introduction
Definition:
A Pharmaceutical suspension is a heterogeneous
system consisting of two phases in which internal phase is
dispersed uniformly throughout the external phase.
• The internal phase consists of particulate matter that is
essentially insoluble but dispersed uniformly throughout
the continuous phase with aid of single or combination
of suspending agent.
• The external phase (suspending medium) is generally
aqueous in some instance, may be an organic or oily
liquid for non-oral use.
4. Introduction
Classification:
Suspensions can be classified as:
1-Based on physical state:
Suspension
Aerosols
Foams
2-Based on Proportion of Solid Particles:
Dilute suspension (2 to10% w/v solid). For example cortisone
acetate, prednisolone acetate
Concentrated suspension (50%w/v solid). For example zinc oxide
suspension
3-Based on behavior of Dispersed Phase:
Flocculated Suspension (Dispersed phase maybe a network of
particle)
Deflocculated Suspension (Dispersed phase may consist of discrete
particles)
5. Introduction
4-Based on Size of Dispersed Particles:
Molecular Dispersion (Particle size is less than 1 nm)
Colloidal Dispersion (Particle size between 0.1-0.2 µm)
Coarse Dispersion (Particle size is greater than 0.2 µm)
5-General classification of Suspension:
Oral suspension (Example is Paracetamol suspension)
Topical suspension (Dispersed phase is in high
concentration often exceeds 20% w/v. Example is Calamine
Lotion)
Parenteral suspension (Solid Contents is between 0.5-5%
w/v. Example includes Procaine penicillin G suspension.
Reference: Lachman/Lieberman’s The theory and practice of
industrial pharmacy 4th edition page no. 655
6. Properties of a Suspension
• A well formulated suspension should have:
• Easy and rapid redispersion of sedimented
particles for uniformity of dose.
• No cake formation on sedimentation.
• Optimum viscosity for pouring.
• Physical and chemical stability.
• Free from gritting particles (in case of external
use)
7. Advantages And Disadvantages:
Advantages:
• Suspension can improve chemical stability of certain drug. For example
Procaine penicillin G.
• Drug in suspension exhibits higher rate of bioavailability than other dosage
forms.
Solution > Suspension > Capsule > Compressed Tablet > Coated tablet
• Duration and onset of action can be controlled. For example Protamine
Zinc-Insulin suspension.
• Suspension can mask the unpleasant/bitter taste of drug. For example
Chloramphenicol
Disadvantages:
• Physical stability, sedimentation and compaction can causes problems.
• It is bulky. Sufficient care must be taken during handling and transport.
• It is difficult to formulate.
• Uniform and accurate dose may not be achieved.
8. Methods For Formulation of Suspension
1-Precipitation method:
Three precipitation methods are used:
Organic solvent precipitation:
• Water insoluble drugs can be precipitated by dissolving them in water-
miscible organic solvent and then adding organic phase to distilled water
under standard conditions.
• Organic solvents used are ethanol, methanol, propylene glycol and
polyethylene glycol.
Precipitation by pH:
• The method of changing the pH of medium is more readily accomplished
and does not present the same difficulties associated with organic solvent
precipitation.
• This method is applicable only to those drugs in which solubility is
dependent on pH value.
• Examples include Estradiol Suspension and Insulin Suspension.
Double Decomposition:
• This method involves simple chemistry.
• Example includes White Lotion (NF XIII).
9. Methods For Formulation of Suspension
2-Dispersion Method:
• In this method, the vehicle must be formulated so that solid phase is easily
wetted and dispersed.
• The use of surfactant is desirable to ensure uniform wetting of
hydrophobic solid.
• The use of suspending agent such as synthetic polymer, natural gums and
others maybe indicated depending upon specific application.
• The actual dispersing of solids may or may not cause particle size
reduction. If particle size reduction occurs, the particles obtained may
have different solubilities and this may lead to super saturation of the
system.
3-Use of controlled flocculation:
• Controlled flocculation of particles is obtained by adding flocculating
agents, which are:
Electrolytes
Surfactants
Polymers
10. Methods For Formulation of Suspension
4-Use of structured vehicle:
• Structured vehicles called also thickening or suspending agents.
• They are aqueous solutions of natural and synthetic gums.
• These are used to increase the viscosity of the suspension.
• These structured vehicles entrapped the particle and reduces the
sedimentation of particles.
• Thus, the use of deflocculated particles in a structure vehicle may form
solid hard cake upon long storage.
• Too high viscosity is not desirable as:
It causes difficulty in pouring and administration.
It may affect drug absorption since they adsorb on the surface of particle
and suppress the dissolution rate.
Structured vehicle is not useful for parenteral suspension because they
may create problem in syringeability due to high viscosity.
Reference: Lachman/Lieberman’s The theory and practice of industrial
pharmacy 4th edition page no. 655
11. Formulation of Suspension
General Procedure
• First the particle size is reduced to a desired size with the help of mill or
other equipments.
• The insoluble materials are levigated or grinded to a smooth paste with a
vehicle containing the wetting agent.
• All soluble ingredients are dissolved in same portion of the vehicle and
added to the smooth paste to get slurry.
• If preparing on small scale, the slurry is then transferred to a graduated
cylinder and mortar is rinsed with successive portion of vehicle.
• If preparing on industrial scale, then slurry is transferred to a colloid mill or
a disperser or any other equipment to completely wet the particles.
• Then a deflocculated suspension is obtained.
• Decide whether the solids are:
Suspended in a structured vehicle
Flocculated
Flocculated and then suspended
• Add the vehicle containing the suspending agent or flocculating agent.
• Make up the dispersion to the final volume.
• Thus suspension is prepared.
12. Flow Chart for formulation of Suspension
Finely divided particles
Particles are added in dispersion medium
Wetting agent is added
Deflocculated Suspension
13. Flow Chart for formulation of Suspension
Deflocculated Suspension
Addition of
Structured Vehicle
Deflocculation
Suspension in structured
vehicle
Flocculating agents
are added
Flocculated suspension
Flocculating agents
are added
Addition of structured
Vehicle
Flocculated Suspension in
structured vehicle
14. Formulation Components
1-Suspending agents:
• Suspending agent are also known as hydrophilic colloids which form
colloidal dispersion.
• Suspending agent form film around particle and decrease interparticle
attraction.
• Most suspending agents perform two functions i.e. besides acting as a
suspending agent they also imparts viscosity to the solution.
• Sodium alginate, Methylcellulose (1-2%), Hydroxyethyl cellulose (1-2%),
Hydroxypropyl cellulose(1-2%) Hydroxypropyl methylcellulose (1-2%)
2-Wetting Agents:
• Hydrophilic materials are easily wetted by water while hydrophobic
materials are not.
• However hydrophobic materials are easily wetted by non-polar liquids.
• The extent of wetting by water is dependent on the hydrophillicity of the
materials.
• The concentration used is less than 0.5 %.
15. Formulation Components
3-Surfactants:
• Surfactants decrease the interfacial tension between drug particles and liquid thus
liquid is penetrated in the pores of drug particle displacing air from them and thus
ensures wetting.
• Generally, we use non-ionic surfactants but ionic surfactants can also be used
depending upon certain conditions.
• Polysorbate 80 is most widely used due to its following advantages:
It is non-ionic so no change in pH of medium.
No toxicity. Safe for internal use.
4-Hydrophilic colloids:
• Hydrophilic colloids coat hydrophobic drug particles in one or more than one layer.
• This will provide hydrophillicity to drug particles and facilitate wetting
• E.g. acacia, tragacanth, alginates, guar gum.
5-Solvents:
• The most commonly used solvents used are alcohol, glycerin, polyethylene glycol
and polypropylene glycol.
• The mechanism by which they provide wetting is that they are miscible with water
and reduce liquid air interfacial tension.
• Liquid penetrates in individual particle and facilitates wetting.
16. Formulation Components
6-Buffers:
• Buffers are the materials which when dissolved in a
solvent will resist any change in pH when an acid or base
is added.
• To encounter stability problems all liquid formulation
should be formulated to an optimum pH.
• Generally pH of suspension preferably at 7.4-8.4.
• Most commonly used buffers are salts of weak acids such
as carbonates, citrates, gluconates, phosphate
17. Formulation Components
7-Preservatives:
• Naturally occurring suspending agents such as tragacanth, acacia, xanthan gum
are susceptible to microbial contamination.
• This leads to loss in suspending activity of suspending agents, loss of color, flavor
and odor, change in elegance etc.
• Propylene glycol, Disodium EDTA (0.1%), Benzalkonium chloride (0.01-0.02%)
Benzoic acid (0.1%)
8- Flavoring and Coloring Agents:
• They are added to increase patient acceptance.
• Only sweetening agent are not capable of complete taste masking of unpleasant
drugs therefore, a flavoring agents are incorporated.
• Examples include Acacia, Ginger, Sarsaparilla syrup, Anise oil, Glucose, Spearmint
oil.
9-Coloring agents:
• Colors are obtained from natural or synthetic sources.
• The synthetic dyes should be used within range of( 0.0005 % to 0.001%)
• Color aids in identification of the product.
• The color used should be acceptable by the particular country.
• Most widely used colors are as follows.
• Titanium dioxide (white), Brilliant blue (blue), Indigo carmine(blue), Amaranth
(red), Tartarazine (yellow), Annatto seeds(yellow to orange)
18. Formulation Component
11- Sweetening Agents:
• They are used for taste masking of bitter drug particles.
• Sugars such as xylose, ribose, glucose, mannose.
12-Humectants:
• Humectants absorb moisture and prevent degradation of API by
moisture.
• Examples of humectants most commonly used in suspensions are
propylene glycol ,glycerol.
• Total quantity of humectants should be between 0-10 % w/w.
13-Antioxidants:
• Ascorbic acid derivatives such as ascorbic acid, erythorbic acid,
• Thiol derivatives such as thio glycerol, cytosine, acetyl cysteine,
• Tocopherols
Reference: Lachman/Lieberman’s The theory and practice of
industrial pharmacy 4th edition page no. 665, 666, 667.
19. Equipment for Suspensions
1-Mortar and pestle
• It consists of a glass or porcelain mortar and a pestle.
Advantages:
• (i) Small quantity suspenisons can be prepared in the laboratory.
• (ii) Low cost
• (iii) Simplest operation among all other instruments.
Disadvantages:
• (i) Generally, the final particle size is considerable larger then in other
equipment.
• (ii) It is necessary for the ingredients to have a certain viscosity prior to
trituration in order to achieve a satisfactory shear.
20. Equipment for Suspensions
2. Agitators / Mechanical stirrers
• A suspension may be prepared by means of various impellers (propellers:
produce axial movements; turbines produce radial and tangential
movements) mounted on shafts.
• For low viscosity suspensions propeller type can be used but for higher
viscosity turbine type is used.
• The degree of agitation is controlled by the rotational speed of impeller,
by the patterns of the liquid flow and the resultant efficiency of mixing are
controlled by the type of impeller, its position in the container, the
presence of baffles, and the general shape of the container.
Advantages: Can be used for small-scale production and laboratory purpose.
Disadvantages: Continuous shaking tends to break up not only the phase to
be dispersed but also the dispersion medium, in this way, impairs the ease of
suspension.
Remedy: Slow the speed of agitator. Avoid continuous running.
23. Equipments for suspension
3. Colloid mill
• The principle of operation of the colloid mill is the passage of
the mixed phases of a suspension between a stator and a high
speed rotor revolving at speeds of 2000 to 18,000 rpm.
• The clearance between the rotor and the stator is adjustable,
usually from 0.001 inch upward. The suspension mixture,
while passing between the rotor and the stator, is subjected
to a tremendous shearing action which effects a fine
dispersion of uniform size.
• The shearing forces applied in the colloid mill usually raises
the temperature within the suspension. Hence, a coolant is
used to absorb the excess heat.
26. Equipments for suspension
Advantage
• (i) Very high shearing force can be generated.
• (ii) Very fine particles can be prepared.
• (iii) Particularly useful in preparing suspensions containing poorly wetted
solids.
• (iv) Useful for the preparation of relatively viscous emulsions.
Disadvantages:
• It has no wide applications in solids
• Wear of the rotating plates
• No fine grinding
• Consume energy
4. Homogenizers
• Impeller type of equipment frequently produce a satisfactory emulsion;
however, for further reduction in particle size, homogenizers may be
employed.
• Homogenizers may be used in one of two ways:
• i) The ingredients in the suspension are mixed and then passed through the
homogenizer to produce the final product.
• (ii) A coarse suspension is prepared in some other way and then passed
through a homogenizer for the purpose of decreasing the particle size and
obtaining a greater degree of uniformity and stability.
27. Equipments for suspension
• The coarse suspension (basic product) enters the valve seat at high
pressure (1000 to 5000 psi), flows through the region between the valve
and the seat at high velocity with a rapid pressure drop, causing
cavitation; subsequently the mixture hits the impact ring causing further
disruption and then is discharged as a homogenized product. It is
postulated that circulation and turbulence are responsible mainly for the
homogenization that takes place.
• Sometimes a single homogenization may produce an emulsion which,
although its particle size is small, has a tendency to clump of form clusters.
Emulsions of this type exhibit increased creaming tendencies. This is
corrected by passing the emulsion through the first stage of
homogenization at a high pressure (e.g. 3000 to 5000 psi) and then
through the second stage at a greatly reduced pressure (e.g. 1000 psi).
This breaks down any clusters formed in the first step (it is a two stage
homogenizer).
29. Equipment for suspension
Piston homogenizers:
• It is the most powerful device for producing emulsions and
suspensions
• It uses high power positive displacement piston type pump to
produce pressure of 3000-10,000 psig and then force the premixed
product through a specially designed restricting wall where a
extremely high shear forces are exerted
• Here turbulence and high shear are the major parameters in size
reduction
• It having continuous Capabilities of 2500L/hr at 15hp to 50,000L/hr
at 150hp.
• Limitations:
• They cannot handle the product feed above 200cps
• High maintenance cost and down time.
31. Equipment for suspension
• 5. Ultrasonic devices
• The preparation of emulsions by the use of ultrasonic vibrations also is
possible. An oscillator of high frequency (100 to 500 kHz) is connected to
two electrodes between which placed a piezoelectric quartz plate. The
quartz plate and electrodes are immersed in an oil bath and, when the
oscillator is operating, high-frequency waves flow through the fluid.
Emulsification is accomplished by simply immersing a tube containing the
emulsion ingredients into this oil bath.
• Advantages
• Can be used for low viscosity and extremely low particle size.
• Disadvantages
• Only in laboratory scale it is possible. Large scale production is not
possible
33. Equipment for suspension
Size Reduction Equipments:
Triple roll mill:
• Disperse small tightly bound agglomerates and hard
discrete particles.
• Particles are subjected to high shear, mechanical crushing.
Ball Mill:
• It is used for size reduction fine solid discrete particles or
for deagglomeration of very tightly bound agglomerates.
• The machine consists of cylindrical drum into which a
charge of heavy spherical balls usually metal or ceramic is
loaded along with the components of the dispersion.
34. Equipment for suspension
Triple Roll Mill
REFERENCE: Pharmaceutical engineering(principles & practices) by
C.V.S. Subrahmanyam.pg.no:155,161,229.
36. Stability Studies
1-Sedimentation Volume:
• Sedimentation volume (F) or height (H) for flocculated suspensions is a
ratio of the ultimate volume of sediment (Vu) to the original volume of
sediment (VO) before settling.
F = Vu / VO
• Where, Vu = final or ultimate volume of sediment VO = original volume of
suspension before settling
• F has values ranging from less than one to greater than one.
• When F < 1 then Vu <VO
• When F =1 then Vu = VO
• The system is in flocculated equilibrium and shows no clear supernatant
on standing.
• When F > 1 then Vu >VO
• Sediment volume is greater than the original volume due to the network
of flocs formed in the suspension and so loose and fluffy sediment
• The sedimentation volume gives only a qualitative account of flocculation.
38. Stability Studies
2-Degree of Flocculation (β):
• It is the ratio of the sedimentation volume of the flocculated suspension, F, to the
sedimentation volume of the deflocculated suspension, F∞
ß = F / F∞
• The minimum value of ß is 1,when flocculated suspension sedimentation volume is
equal to the sedimentation volume of deflocculated suspension.
3-Brownian Movement (Drunken walk):
Brownian movement of particle prevents sedimentation by keeping the dispersed
material in random motion.
• Brownian movement depends on the density of dispersed phase and the density
and viscosity of the disperse medium.
• The kinetic bombardment of the particles by the molecules of the suspending
medium will keep the particles suspending, provided that their size is below
critical radius (r).
Brownian movement can be observed,
If particle size is about 2 to 5mm,
When the density of particle & viscosity of medium are favorable.
• Brownian motion is given by equation:
𝐷𝑖2 = 𝑅𝑇𝑡 ÷ 𝑁3𝜋 η r
• Where, R = gas constant T = temp. in degree Kelvin N = Avogadro’s number η =
viscosity of medium t = time r = radius of the particle.
39. Stability Studies
4-Electro kinetic Properties:
Zeta Potential:
• The zeta potential is defined as the “difference in potential between the surface of
the tightly bound layer (shear plane) and electro-neutral region of the solution”.
• As the potential drops off rapidly at first, followed more gradual decrease as the
distance from the surface increases.
• This is because the counter ions close to the surface acts as a screen that reduce
the electrostatic attraction between the charged surface and those counter ions
further away from the surface.
• Zeta potential has practical application in stability of systems containing dispersed
particles.
• Since this potential, rather than the Nernst potential, governs the degree of
repulsion between the adjacent, similarly charged, dispersed particles.
• If the zeta potential is reduced below a certain value, the attractive forces exceed
the repulsive forces, and the particles come together.
• This phenomenon is known as flocculation.
• The flocculated suspension is one in which zeta potential of particle is -20 to +20
mV.
• Thus the phenomenon of flocculation and de flocculation depends on zeta
potential carried by particles.
41. Stability Studies
Deflocculation and flocculation:
• Flocculated Suspensions:
• In flocculated suspension, formed flocs (loose aggregates) will cause
increase in sedimentation rate due to increase in size of sedimenting
particles.
• Hence, flocculated suspensions sediment more rapidly.
• Here, the sedimentation depends not only on the size of the flocs but also
on the porosity of flocs.
• Deflocculated suspensions:
• In deflocculated suspension, individual particles are settling.
• Rate of sedimentation is slow, which prevents entrapping of liquid
medium which makes it difficult to re-disperse by agitation.
• This phenomenon called ‘caking’ or ‘claying’.
• In deflocculated suspension larger particles settle fast and smaller remain
in supernatant liquid so supernatant appears cloud.