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The qualitative and quantitative analysis of fatty acids in the Korean White Poria cocos(Schw.) Wolf were performed. Dry powder of sample was extracted with chloroform-methanol(2 : 1, v/v) mixed solvent. The extract was saponified and methylated, and then analyzed by gas chromatography. Total 24 peaks were observed in the gas chromatogrom and 5 peaks i.e, C_(8:0) ; caprylic acid, C_(11:0) ; undecanoic acid, C_(12:0) ; lauric acid, C_(12:1), ; dodecenoic acid and C_(16:0) ; palmitic acid were identified. Major components were C_(8:0) and C_(12:1), and were determined as 6.657㎍/g and 10.176㎍/g respectively.
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