Purifying polyoxyethylated castor oils with activated charcoal and pharmaceutical formulations thereof

摘要

Disclosed are polyoxyethylated castor oils produced by preparing a suspension of activated charcoal and a polyoxyethylated castor oil; and separating the activated charcoal from the polyoxyethylated castor oil. The process removes impurities such as colorants and alkali metal cations. Also disclosed are compositions containing the castor oil and an active agent such as a pharmaceutical agent. The formulations have prolonged storage stability.