title: Four new antioxidant phenylpropanoid glycosides from Microlepia pilosissima.
abstract: Four new phenylpropanoid glycosides, 9-O-[β-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl]-3,4-dimethoxy-cinnamic acid (1), 9-O-[β-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl]-4-methoxycinnamic acid (2), 9-O-α-L-rhamnopyranosyl-3,4-dimethoxy-cinnamic acid (3), and 9-O-[6-Oacetyl-β-D-glucopyranosyl]-4-methoxy-cinnamic acid (4), together with three known compounds 9-O-α-L-rhamnopyranosyl-4-hydroxy-cinnamic acid (5), 9-O-β-D-glucopyranosyl-4-methoxycinnamic acid (6), and 9-O-β-D-glucopyranosyl-3,4-dimethoxy-cinnamic acid (7) were isolated from the 70% EtOH extract of the dry fronds of Microlepia pilosissima. Their chemical structures were elucidated by spectroscopic analysis. Moreover, 1 and 2 exhibited comparable scavenging activities with (±)-α-tocopherol against DPPH radicals, while compounds 3-7 displayed moderate antioxidant activities.
authors.affiliation: College of Biological Resources and Environment Science, Qujing Normal University, Qujing 655011, Yunnan, China. hujiang@ustc.edu
authors.forename: Jiang
authors.initials: J
authors.lastname: Hu
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Shi
authors.forename: Jiangang
authors.initials: J
authors.lastname: Chen
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000302:isolation & purification; D032497:Dennstaedtiaceae; D004365:Drugs, Chinese Herbal / Q000737:chemistry* / Q000302:isolation & purification; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D020005:Propanols / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000975:Antioxidants; D004365:Drugs, Chinese Herbal; D006027:Glycosides; D020005:Propanols