Question

Which of the following ointment bases is an ingredient of an absorption base?

• A. Petrolatum
• B. Lanolin
• C. Hydrogenated castor oil
• D. Cetyl alcohol

Answer 1

The Correct Option is B

The question asks about which ointment base is an ingredient of an absorption base. Let's evaluate each option:

1. Petrolatum: Petrolatum is generally used as an occlusive, water-impermeable ointment base. It is not typically considered an absorption base as it does not absorb water readily.
2. Lanolin: Lanolin is a well-known absorption base. It has the ability to absorb water or aqueous solutions, forming a water-in-oil emulsion, which is a characteristic property of absorption bases. Lanolin can hold up to twice its weight in water.
3. Hydrogenated Castor Oil: This is typically used in formulation as a solid fat or thickening agent rather than as an absorption base.
4. Cetyl Alcohol: While cetyl alcohol can be used to enhance the texture and stability of creams and somtimes improve water absorption, it is not primarily classified as an absorption base on its own.

Among the options provided, Lanolin is the only one that clearly meets the criteria of being an absorption base. It has the capability to enhance the absorption of aqueous solutions, which makes it ideal for forming water-in-oil emulsions.

Therefore, the correct answer is: Lanolin.