: In this method, the proportions of oil, water, and emulsifier are the same (4:2:1), but the order and techniques of mixing are different. This can be achieved by using ionic emulsifying agent, electrolytes etc. O/W emulsions are more acceptable as water washable drug bases for cosmetic purposes. Of the emulsion, hence cooling may be required. They are again of two types as. These stirrers can not be used when :vigorous agitation is needed. The pH of an emulsion prepared with cationic emulsifier is in pH 4 -6 range. sodium lauryl sulphate , dioctyl sulphosuccinate.
Difference in the densities of dispersed phase and dispersion medium. Example: Calculate the quantities for a primary emulsion for the following: Cod liver oil is a fixed oil, therefore the primary emulsion proportions are 4 : 2 : 1 .Hence: Cod liver oil 30 ml 4, Water 15 ml 2, Powdered acacia gum 7.5g 1. 60 tones psi can be achieved in commercial equipment. sorbitans fatty acids : They are hydrophilic and give o/w emulsion. So preservative is a must for emulsions. This is indicated by complete separation of oil and aqueous phases, is an irreversible process, i.e., simple mixing fails. From plant origin Polysaccharides ( Acacia, tragacanth, agar, pectin, lecithin) o/w emulsions.
Here water comprises two layers while oil is a center layer. Doubling the diameter of oil globules increases the creaming rate by a factor of four.Increasing the viscosity of the external phase by adding the thickening agents such as methyl cellulose tragacanth or sodium alginate.Reducing the difference in the densities between the dispersed phase and dispersion medium. HLB ca. Examples of those obtained from animals are gelatin, egg yolk, casein, wool fat and cholesterol. polyoxyethylene derivatives of sorbitan fatty acid esters (Tweens or polysorbates), Polyoxyethylene / polyoxypropylene block polymers (Poloxamers). The required amount of oil is taken in a china dish and water is taken into a beaker. They may be defined as dispersions of insoluble liquids in a second liquid that appears clear and homogenous to the naked eye. They have disagreeable taste and are irritating to the GIT.. Thanks for Sharing Awesome Blog!! Click here to find your hidden name meaning. An emulsion is a type of colloid formed by combining two liquids that normally don't mix. 3.5 to 8: Water-in-Oil Emulsifiers, HLB ca. Importance of Education in Life & Society, Cells in the Human Body | 14 Types with Examples and Functions, Organs of the body | Their Locations and Internal Functions, 14 Uses of Plants & their Importance to Humans & Nature, 10 Types of Chromatography | Based on Different Techniques & Methods, Grammarly Premium Review | A Complete Writing Assistant, Types of Pollution | Their Causes and extent of Damage, 9 Different Types of Spectroscopy Techniques & their Uses, 6 Types of birds | Scientific Classification with Characters & Pictures, 5 Special Sense Organs | Their Location and Functions in the Body, Root System | 5 Basic Types with Examples and Pictures, Differences between Chemical and Physical Change.
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