The sterols from Xanthii Fructus and Phellodendri Cortex were reinvestigated using gas chromatography. Gas chromatographically pure stigmasterol. β-sitosterol and campesterol were obtained by a repeated recrystallization of either acetate or benzoate of the sterol mixture. γ-Sitosterol isolated from Phellodendri Cortex and also from soybean was found to be a mixture of campesterol and β-sitosterol (1 : 1).
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Nishioka et al. (1965) studied this question.