Preparation of Castor Oil Emulsion

Aim: To prepare and submit Castor oil emulsion. 

Requirements: Castor oil, Purified water, Gum acacia, Measuring cylinder, Mortar, and pestle. 

Theory: Castor oil is a fixed oil and is not miscible with water. To make it miscible, a third substance is known as an emulsifying agent in the ratio of 4: 2: 1 i.e, oil: water: gum is to be used for the preparation of primary emulsion. Gum acacia is to be used as an emulsifying agent because emulsions prepared with gum acacia remain stable for a sufficiently long time. 


IngredientsStandard formula 
Castor oil8 ml 
Purified water4 ml
Gum acacia2 gm 


  1. Thoroughly clean and dry a pestle and mortar. 
  2. Weigh out 2 g gum acacia and transfer it to the mortar. 
  3. Measure 4 ml water and triturate it with gum to form a mucilage. 
  4. To this add 8 ml castor oil in small quantities at a time with thorough trituration after each addition. 
  5. Triturate briskly without ceasing until a clicking sound is produced and the product becomes white or nearly white. 
  6. At this stage, the emulsion is known as the primary emulsion. 
  7. Add about 10 ml more of the vehicle in small quantities at a time with constant triturating to get a homogeneous product. 
  8. Transfer the emulsion to a measuring cylinder and add more of the vehicle to produce the final volume of 30 ml. Stir thoroughly to form a uniform emulsion. 

Category: Laxative. 

Storage: Store in a well-closed container and keep in a cool place. 


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