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已发现的天然甾醇均为20R构型。近年来在地质体中发现了具有20S构型的甾烷类生物标志化合物,并称之为地质构型。由于从油页岩或原油中分出的都是有机化合物的复杂混合物,而用一般的化学物理方法很难分离得到单一的烷烃类生物标志化合物,因而用合成标样对比的办法(GC—MS)成为鉴定生物标志物结构既快速又准确的
Natural sterols have been found in the 20R configuration. In recent years, steranes have been found in geologic bodies and have been identified as geostructures. Because of the complex mixture of organic compounds separated from oil shale or crude oil, it is very difficult to separate a single alkane biomarker by general chemical and physical methods. Therefore, GC-MS ) Has become fast and accurate in identifying biomarker structures