Table of Contents
Pharmaceutical emulsions are liquid disperse systems in which the dispersed phase is composed of small globules of a liquid distributed throughout a vehicle in which it is immiscible. Pharmaceutical emulsions are used for the administration of nutrients, drugs, and diagnostic agents.
What is an emulsion in pharmaceutics?
An emulsion is a thermodynamically unstable two-phase system consisting of at least two immiscible liquids, one of which is dispersed in the form of small droplets throughout the other, and an emulsifying agent. More typically, emulsions are used for topical administration.
What are the pharmaceutical applications of emulsion?
Emulsions are commonly used in many major chemical industries. In the pharmaceutical industry, they are used to make medicines more palatable, to improve effectiveness by controlling dosage of active ingredients, and to provide improved aesthetics for topical drugs such as ointments.
What are the qualities of primary emulsion?
When the product becomes white and produces a clicking sound, the primary emulsion has been formed. The product should be a thick, white cream. Increased degree of whiteness indicates a better-quality product. Oil globules or slicks should not be apparent.
What is the process of emulsion?
Emulsification is the process of dispersing two or more immiscible liquids together to form a semistable mixture. Most common emulsions are of the oil-in-water (O/W) type. Examples of food emulsions include mayonnaise, sauces, ice-cream, and milk.
What’s the use of emulsion?
Emulsion: A light-weight, non-sticky, water-based basic moisturizer that helps your face absorb other beauty products. It helps retain hydration level and prevent moisture loss from our skin surface. It is good for people with oily skin, as it is water base, it does not cause pore clogging issues.
What are examples of emulsion?
In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, homogenized milk, liquid biomolecular condensates, and some cutting fluids for metal working. Two liquids can form different types of emulsions.
Is blood an emulsion?
Is blood a emulsion? Another type of colloid is an emulsion, fats and some proteins dispersed in the liquid are colloid emulsions. Blood is also a complex solution where solids, liquids, and even gases are dissolved in the blood liquid called plasma.
What are the types of emulsion in pharmacy?
There are two basic types of emulsions, that is, oil in water (O/W) and water in oil (W/O). In addition to these two types, a relatively complex emulsion, called multiple emulsions can also be formulated.
What are the types of emulsion?
There are two basic types of emulsions: oil-in-water (O/W) and water-in-oil (W/O). These emulsions are exactly what they sound like, as pictured below. In every emulsion there is a continuous phase that suspends the droplets of the other element which is called the dispersed phase.
How does emulsion polymerization work?
Emulsion polymerization is a polymerization process with different applications on the industrial and academic scale. It involves application of emulsifier to emulsify hydrophobic polymers through aqueous phase by amphipathic emulsifier, then generation of free radicals with either a water or oil soluble initiators.
Which is the following is an example of emulsion?
Emulsion Examples Dispersed Phase Dispersion Medium Example Liquid Solid Cheese, Butter, Jellies Liquid Liquid Milk, Hair Cream Liquid Gas Fog, Mist, Cloud, Insecticide Sprays Gas Solid Pumice Stone, Foam Rubber.
What are the 3 types of emulsions?
In the culinary arts, an emulsion is a mixture of two liquids that would ordinarily not mix together, like oil and vinegar. There are three kinds of emulsions: temporary, semi-permanent, and permanent. An example of a temporary emulsion is a simple vinaigrette while mayonnaise is a permanent emulsion.
How do you identify emulsion?
Thus, the following methods have been used to identify the type of emulsions. Dye TEST: Water-soluble dye will dissolve in the aqueous phase. Dilution test: Based on the solubility of external phase of emulsion.
Which is the limitation of emulsion polymerization?
A limitation of emulsion polymerization is that good results cannot be met if the monomer is too hydrophobic because diffusion into swollen micelles from monomer droplets is very slow for these kinds of monomers [41].
What is creaming and cracking of emulsion?
Creaming occur when isolated oil droplets combine and rise to the top of an oil water emulsion or sink to the bottom in w/o emulsions. In both scenarios, the emulsion can be easily re-dispersed by shaking. Coalescence (breaking or cracking) is the total and irreversible division and fusion of the dispersed stage.
What are the 4 types of emulsions?
Types of emulsions Oil-in-water emulsion. When the oil phase is dispersed as globules throughout an aqueous con-tinuous phase, the system is referred to as an oil-in-water (o/w) emulsion. Water-in-oil emulsion. Multiple emulsions. Microemulsions.
What are the disadvantages of emulsion?
Disadvantages of emulsions. Pharmaceutical emulsions are thermodynamically unstable and therefore must be formulated to stabilize the emulsion from separation of the two phases. Pharmaceutical emulsions may be difficult to manufacture. Storage conditions may affect stability.
What is the difference between suspension and emulsion?
Mixtures can be of many types like a solution, suspension and colloids. A mixture can be classified into two types, homogeneous mixture and heterogeneous mixture.Difference between Suspension and Emulsion. Suspension Emulsion Solid particles are dispersed in any medium, that can be solid, gas or liquid Both dispersed phase and the dispersion medium are liquid.
What are the advantages of emulsion?
Viscosity of polymer emulsion is much lower than that of straight polymer in melt phase. Easier to process but also allows production of polymers that are extremely sticky as 100% polymer. Final product can easily be removed from reactor due to lower viscosity (and can be washed out with water).
What are the 2 types of emulsion?
Emulsions easily fall into two categories: an oil-in-water (O/W) or water-in-oil (W/O) emulsion, depending on the continuous phase. The type of emulsion that forms depends largely on the volume ratio of the two materials, with the more abundant phase forming the continuous phase.
What is an emulsion and give an example?
An emulsion is a type of colloid formed by combining two liquids that normally don’t mix. In an emulsion, one liquid contains a dispersion of the other liquid. Common examples of emulsions include egg yolk, butter, and mayonnaise. The process of mixing liquids to form an emulsion is called emulsification.
