There are several kinds of chemical and (biological) synthesis methods for preparation of farnesol, besides directseparation from natural material.
金合欢醇除了可由天然原料直接分离得到外，还有多种化学合成方法和生物合成方法。
2
Direct characterization technologies for chemical analysis of fibers, without a previous separation of the components or component groups from each other, were reviewed.
该文主要介绍在不对纤维组分进行预先分离的条件下，纤维化学特性的表征技术。
3
The transformation of sodium tungstate solution, direct extraction of sodium tungstate under alkali conditions and separation of molybdenum from tungsten by solvent extraction are mainly introduced.