Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
Tyrosinase Inhibitors from Crude Drugs
Sachiko SHIROTAKouji MIYAZAKIRitsuo AIYAMAMinoru ICHIOKATeruo YOKOKURA
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1994 Volume 17 Issue 2 Pages 266-269

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Abstract

Various crude drugs were examined for their tyrosinase inhibitory activity. Marked activity was observed in Chouji and Yakuchi extracts and the active substances in these extracts were identified as eugenol and yakuchinone A, respectively. Other vanillyl compounds such as ferulic acid, curcumin and yakuchinone B also had higher activities than eugenol or yakuchinone A and inhibited the enzyme competitively. The presence of the hydroxyl group at the 4 position of the aromatic ring of the cinnamoyl moiety and the α, β-unsaturated carbonyl conjugated with an aromatic ring in these substances may play important roles in the competitive inhibition of tyrosinase.

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© The Pharmaceutical Society of Japan
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