title: Bio-guided isolation of antioxidants from the stems of Dendrobium aurantiacum var. denneanum.
abstract: Bio-guided fractionation of the stems of Dendrobium aurantiacum var. denneanum using a 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging assay, led to the isolation of three 2-glucosyloxycinnamic acid derivates, namely, cis-melilotoside, trans-melilotoside and dihydromelilotoside, respectively. Their structures were elucidated through the analysis of uni- and bi-dimensional NMR, UV, IR and MS data. All these three compounds were first reported from the genus Dendrobium and exhibited potent antioxidant activities.
authors.affiliation: Key Laboratory of Standardization of Chinese Medicines of Ministry of Education, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, 201203 Shanghai, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.forename: Haofeng
authors.initials: H
authors.lastname: Han
authors.forename: Norio
authors.initials: N
authors.lastname: Nakamura
authors.forename: Masao
authors.initials: M
authors.lastname: Hattori
authors.forename: Zhengtao
authors.initials: Z
authors.lastname: Wang
authors.forename: Luoshan
authors.initials: L
authors.lastname: Xu
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D001713:Biphenyl Compounds; D031667:Dendrobium; D006801:Humans; D008517:Phytotherapy; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry*; D018547:Plant Stems; D013329:Structure-Activity Relationship
chemical_list: D000975:Antioxidants; D001713:Biphenyl Compounds; D010851:Picrates; D010936:Plant Extracts; C004931:1,1-diphenyl-2-picrylhydrazyl