title: Antioxidative polyphenols from Nigerian mistletoe Loranthus micranthus (Linn.) parasitizing on Hevea brasiliensis.
abstract: Two new phenolic glycosides, linamarin gallate (1) and walsuraside B (2), together with nine known compounds, catechin (3), epicatechin (4), epicatechin 3-O-gallate (5), epicatechin 3-O-(3-O-methyl)gallate (6), epicatechin 3-O-(3,5-O-dimethyl)gallate (7), epicatechin 3-O-(3,4,5-O-trimethyl)gallate (8), quercetin 3-O-β-d-glucopyranoside (9), rutin (10), and peltatoside (11), were isolated from the leafy twigs of Nigerian mistletoe Loranthus micranthus (Linn.) parasitic on Hevea brasiliensis. Compound 1 was characterized as an unusual cyanogenic glycoside, while compound 8 was isolated for the first time from a natural source. This is the first report of a cyanogenic glycoside from mistletoes. The structures of the new compounds were unambiguously elucidated by 1D ((1)H, (13)C), 2D NMR (COSY, HSQC, and HMBC) and by mass spectroscopy. The antioxidant activities of the isolated compounds (1-11) were evaluated using the 2, 2-diphenyl-1-picrylhydrazyl (DPPH) assay.
authors: Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine University, Düsseldorf, Universitätstrasse 1.Geb.26.23, 40225 Düsseldorf, Germany.
authors: Matthias Onyebuchi
authors: MO
authors: Agbo
authors: Daowan
authors: D
authors: Lai
authors: Festus B C
authors: FB
authors: Okoye
authors: Patience O
authors: PO
authors: Osadebe
authors: Peter
authors: P
authors: Proksch
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001713:Biphenyl Compounds / Q000378:metabolism; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D028482:Hevea / Q000469:parasitology; D028183:Loranthaceae / Q000737:chemistry*; D015394:Molecular Structure; D009549:Nigeria; D009570:Nitriles / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D010851:Picrates / Q000378:metabolism; D010936:Plant Extracts / Q000737:chemistry* / Q000494:pharmacology; D018515:Plant Leaves; D018547:Plant Stems; D059808:Polyphenols / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D006027:Glycosides; D009570:Nitriles; D010851:Picrates; D010936:Plant Extracts; D059808:Polyphenols; C584348:linamarin gallate; C584349:walsuraside B; C004931:1,1-diphenyl-2-picrylhydrazyl