Emulsions PDF Notes


Emulsion is ‘defined’ as biphasic liquid dosage form
containing a mixture of oil and water and addition of emulsifying agent or
emergent to product emulsion.

Classification of

 A) According to the mode of dispersion:-

1) O/W (Oil in water)- oil is an internal phase. Water is
external phase ex- milk consists of liquid fat particles dispersed in water.

2) W/O (Water in oil)- Water is an internal phase.oil is
external phase. Emulsion of water in oil

Disperse phase is water and the dispersion medium is oil.
For example, cod liver oil consists of particles of water dispersed in oil.

B) According to
Physical Properties

1) Liquid emulsion-
usually O/W type and used parenterally orally and externally.

2) Semi solid
this type of emulsion used for external purpose.

C) According to
partical size:-

1) Coarse emulsion

2) Micro emulsion

3) Fine emulsion

Type of emulsion:-

1) Water in Oil
emulsion (W/O):-
In these emulsion rufer to water in oil. If the dispersed
phase in water and dispersion medium is oil

2) Oil in water emulsion (O/W):- These type of emulsion
rufer to water oil in oil water in these dispersed phases is oil and dispersion
medium is water.

Formulation of
Following  ingredients
are included in the formulation of emulsion.

1) Oil phase: –
This phase medicament or vehicle is made up of fixed oil mineral oil, volatile
oil or also resin type that is used for preparation of emulsion.

2) Aqueous phase: –
Due to increased risk of microbial contamination freshly boiled and cooled
purified water are used.

3) Antioxidant: –
It prevents the oil form getting oxidizing during Its shelf like hence It
enhance the stability of the oil phase in the emulsion.

4) Flavoring agent: –
It enhances the palatability of the final product pineapple, orange, chocolate,
and mint flavors are commonly used.

5) Colouring Agent: –
It is used for identifying the preparation and enhancing its aesthetic appeal.
Erythrosine tartrazine etc. Colors approved by the food Drug and cosmetic act
are used as Colouring Agent.

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