| abstract |
The invention concerns a method of extracting sennosides A, B and A1. The method comprises the following steps: a sennoside mixture is reduced to the corresponding anthrone-8-glucosides, the aloe-emodin components are removed by liquid-liquid separation of the anthrone-8-glucosides, and the rheine-9-anthrone-8-glucoside obtained after the separation step is oxidized again to sennosides A, B and A1. The invention also concerns sennosides A, B and A1 obtained by this method and pharmaceutical agents containing them. |