| 摘要 |
A process for the isolation and recovery of beta -sitosterol substantially free of alpha -sitosterol from the unsaponifiables obtained from crude soap skimmings or from a crude sterol mixture containing beta -sitosterol, alpha -sitosterol and campesterol. The starting material is treated with an inorganic or organic acid in an organic solvent, whereby alpha -sitosterol reacts with the acid giving rearrangement products. The solution is cooled and filtered or the solvent is distilled off, whereafter the obtained crude beta -sitosterol is recrystallized from an organic solvent, to yield the pure material. |
