英语语法分析

OBJECTIVE to determine the inhibitory effect of rutaecarpine (WZY) on cytochrome P450s in human liver microsome.

目的研究吴茱萸次碱(WZY)在人肝微粒体中对细胞色素P 450酶的抑制作用。

METHODS: Evodiamine and rutaecarpine were extracted with the solvent ethyl acetate and the ultrasonic extractor.

方法：以乙酸乙酯为溶剂用超声震荡提取法提取吴茱萸碱和吴茱萸次碱。

Objective: To investigate the effect of rutaecarpine on the ventricular fibrillation threshold (VFT) of isolated rat heart.

目的：研究吴茱萸次碱对离体大鼠室颤阈的影响。