Tyrosinase inhibitory p-coumaric acid from ginseng leaves. |
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| Authors: | J Y Lim K Ishiguro I Kubo |
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| Institution: | Department of Environmental Science, Policy and Management, University of California, Berkeley, CA 94720-3112, USA. |
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| Abstract: | By bioassay-guided fractionation using mushroom tyrosinase, p-coumaric acid was characterized as the principal tyrosinase inhibitor from the fresh leaves of Panax ginseng (Araliaceae). It inhibited the oxidation of L-tyrosine more strongly than that of L-3, 4-dihydroxyphenylalanine (L-DOPA) by this enzyme. On the basis of this finding, various related phenylpropanoid analogues were also tested in order to gain new insights into their structural criteria. |
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