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1. Emulsion
Presented By- Saurabh Dubey
M.Pharm
Bundelkhand University

2. Emulsion
Biphasic system consisting of two
immiscible liquids usually water and oil.
• It consists of two phase
Internal phase -Dispersed or Discontinuous
External phase -Dispersion or Continuous
Emulsion is coarse dispersion having globule
size 0.1-100 mm
• It may be defined as biphasic liquid dosage
form in which two liquids are immiscible
with each other.
• Thermodynamically unstable, emulsifying
agents are needed

3. Preparation
Method
Dry Gum methods (4 Part Oil,1 Part Gum, 2 Part
Water)
Oil + Gum Triturate Add water Again
→ → →
Triturate
Wet gum method (4 Parts Oil, 1 Part Gum, 2 Part
Water)
Water + Gum Triturate Add oil Again
→ → →
Triturate
Bottle method Used for volatile or Non viscous
oils
1Part Gum + 4 Part Oil + Required Water – Add in
Dry Capped Bottle and Thoroughly shaken

4. Types of
Emulsion
Macro Emulsion
a) O/W
b) W/O
Multiple Emulsion
a) O/W/O
b) W/O/W
Micro Emulsion- Size range - 0.01 - 0. 1 μ
Microemulsions are clear,
thermodynamically stable isotropic liquid
mixtures of oil, water and surfactant,
frequently in combination with a
cosurfactant.

5. Problem of Emulsion

6. Identification Test of Emulsion
1. Dilution test-
Emulsion can be diluted
only with external phase.
2. Dye test- Water-
soluble solid dye tints
only o/w emulsion and
also vice versa.
3. Conductivity
test- Electric current is
conducted by o/w
emulsions because water
is the good conductor of
electricity
4. Fluorescence
test- Since oils fluoresce
under UV-light so o/w
emulsions exhibit dot
pattern, while w/o
emulsions fluoresce
throughout.
5. CoCl2 / filter paper
test- Filter paper
impregnated with CoCl2
and dried, blue color
changes to pink when
(O/W) emulsion is added.
6. Creaming
test- Direction of
creaming helps in the
identification
• O/W - upward creaming
• W/O - downward
creaming