期刊
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
卷 75, 期 11, 页码 2207-2212出版社
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.110491
关键词
clove; pimento; polyphenol; antioxidant; oxygen radical absorbance capacity (ORAC)
类别
资金
- Ministry of Health, Labour and Welfare of Japan
Two new polyphenolic glucosides, 6'-O-acetylisobiflorin (1) and (2S)-3-(4-hydroxy-3-methoxyphenyl)-propane-1,2-diol 1-O-(6'-O-galloyl)-beta-D-glucoside (2), were respectively isolated from the flower buds of Syzygium aromaticum and berries of Pimenta dioica. Each structure was elucidated on the basis of spectral analyses (NMR, MS and [alpha](D)) and chemical conversion. A total of twenty-seven known compounds from the plants were also characterized. The antioxidative activity of their extracts and the twenty-nine isolates including gallo- and ellagitannins was estimated by oxygen radical absorbance capacity (ORAC) assay, and eugenol (3), which was the most abundant ingredient in each plant extract, showed the most potent antioxidative activity [ORAC value of 39,270 mu mol TE (trolox equivalent)/g].
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