title: Secondary metabolites from Opuntia ficus-indica var. saboten.
abstract: A butanol fraction, from the methanolic extract of Opuntia ficus-indica var. saboten, on purification either by preparative TLC or reversed phase HPLC, yielded three chemical components: isorhamnetin 3-O-(6''-O-E-feruloyl)neohesperidoside (1), (6R)-9,10-dihydroxy-4,7-megastigmadien-3-one-9-O-beta-D-glucopyranoside (2) and (6S)-9,10-dihydroxy-4,7-megastigmadien-3-one-9-O-beta-D-glucopyranoside (3) along with 15 known compounds. Structures of compounds (1-3) were elucidated by aid of spectroscopic analyses. The absolute stereochemistry in compounds 2 and 3 was established with the help of CD data analysis and comparison with the literature data. In a DPPH radical scavenging assay, compound 1 showed moderate inhibitory activity (IC50 = 45.58 microg/ml).
authors.affiliation: Division of Life Sciences, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Republic of Korea.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Saleem
authors.forename: Hyoung Ja
authors.initials: HJ
authors.lastname: Kim
authors.forename: Chang Kyun
authors.initials: CK
authors.lastname: Han
authors.forename: Changbae
authors.initials: C
authors.lastname: Jin
authors.forename: Yong Sup
authors.initials: YS
authors.lastname: Lee
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D029747:Opuntia / Q000737:chemistry* / Q000378:metabolism*; D013237:Stereoisomerism