Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Organic Chemistry Regular Papers
Polyphenolic Compounds in Clove and Pimento and Their Antioxidative Activities
Morio YOSHIMURAYoshiaki AMAKURATakashi YOSHIDA
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2011 Volume 75 Issue 11 Pages 2207-2212

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Abstract

Two new polyphenolic glucosides, 6′-O-acetylisobiflorin (1) and (2S)-3-(4-hydroxy-3-methoxyphenyl)-propane-1,2-diol 1-O-(6′-O-galloyl)-β-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 [α]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 μmol TE (trolox equivalent)/g].

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© 2011 by Japan Society for Bioscience, Biotechnology, and Agrochemistry
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