title: Polyphenolic compounds in clove and pimento and their antioxidative activities.
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].
authors: College of Pharmaceutical Sciences, Matsuyama University, Matsuyama, Ehime, Japan.
authors: Morio
authors: M
authors: Yoshimura
authors: Yoshiaki
authors: Y
authors: Amakura
authors: Takashi
authors: T
authors: Yoshida
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D035264:Flowers / Q000737:chemistry; D005638:Fruit / Q000737:chemistry; D005707:Gallic Acid / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D005960:Glucosides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D015394:Molecular Structure; D009285:Naphthoquinones / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D027841:Pimenta / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000737:chemistry; D027842:Syzygium / Q000737:chemistry*
chemical_list: C570737:(2S)-3-(4-hydroxy-3-methoxyphenyl)-propane-1,2-diol-1-O-(6'-O-galloyl)-beta-D-glucoside; C570736:6'-O-acetylisobiflorin; D000975:Antioxidants; D005960:Glucosides; D009285:Naphthoquinones; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D005707:Gallic Acid