Page 118 - Applied Pharmacognosy

Types of Chemical markers

• The stationary phase in gas solid chromatography (GSC)

:
is a solid with adsorptive power such as silica gel
or charcoal.

• The stationary phase in gas liquid chromatography

(GLC) :
is a nonvolatile, thermally-stable liquid, such as paraffin oil

or PEG, coated on a solid support (kieselguhr).