I am performing column chromatography on plant extract and i want to know the grade of silica?

Question

i want to know which grade of silica can be used

Answer 1

The choice of sorbent depends on the solubility and polarity of substances you want to separate.

This ( illustrated ) site shows column preparation, different samples of silica gel and their application possibilities:

http://www.erowid.org/archive/rhodium/ch...

Here a site referring about preparative chromatography methods:

http://kilomentor.chemicalblogs.com/55_k...

Different sorts of silica gel for chromatographic use in U.S. Pharmacopeia:

http://www.pharmacopeia.cn/v29240/usp29n...