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In order to establish the chemical standards for the quality control of ginseng extract, an approach for the assay of sapogenin contents in the part of main roots and fibrous side roots was performed by combination of preparative thin layer chromatographic procedure and vanillin-H2SO4 color reaction. The contents of dammarane aglycones as function of dammarane glycosides in 80%-EtOH extracts were analyzed by the method from the main roots and fibrous side roots of Korean ginseng grown for 4-6 years. The differences by their grown ages in the ratio of panaxadiol to pannaxatriol contents, and in the amounts of 80% EtOH extract were not significant in the parts of main roots and fibrous side roots of Korean gingeng. Differences due to the part for medicinal uses were highly significant in all parameters mentioned, showing following results; in the main roots; 80% EtOH extract, 12.7-15.7%: the ratio of aglycone composition, 0.955-1.012:dammarane glycoside (as diglucoside gases), 1.537-1.863; in the fibrous side roots; 80% EtOH extract, 26.0--26.02%: dammarane glycoside, 4.767-5.641: the ratio, 1.465-1.50.
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