英语语法分析

The four purified squalene synthase used to catalyzed the substrate FPP. Then the catalysate squalene were detected by GC-MS analysis method with the 18.44 retention time (RT).

纯化后的4个鲨烯合酶分别以FPP为底物进行体外催化反应，产物经GC-MS分析在保留时间（RT）为18.44可检测到鲨烯。