Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 74, Issue 1, Pages 212-215Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.90697
Keywords
Myrica rubra; unused leaf; antioxidant activity; tyrosinase inhibitory activity; lipoxygenase inhibitory activity
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Funding
- The Cosmetology Research Foundation (Tokyo)
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Potent inhibitory activity of the leaves of Myrica rubra against both chemical and enzymatic (tyrosinase and lipoxygenase) oxidation was found in our project to develop utility of unused and rarely used plant resources in the local area. A constituent analysis of the most active ethyl acetate-soluble part of a methanol extract of the leaves clarified the structures of eight major compounds. The tyrosinase and lipoxygenase inhibitory activities and DPPH radical scavenging activity of the isolated compounds were measured as indicators of the inhibitory capacity against the enzymatic and chemical oxidation of food. The obtained data indicate that the chemical and enzymatic (lipoxygenase and tyrosinase) antioxidant activities of the leaves mainly depended on the galloyl flavonoid derivatives.
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