title: New chemical constituents from Oryza sativa straw and their algicidal activities against blue-green algae.
abstract: Five new constituents, 5,4'-dihydroxy-7,3'-dimethoxyflavone-4'-O-β-D-xylopyranosyl-(2a→1b)-2a-O-β-D-xylopyranosyl-(2b→1c)-2b-O-β-D-xylopyranosyl-2c-octadecanoate (1), 5,4'-dihydroxy-7,3'-dimethoxyflavone-4'-O-α-D-xylopyranosyl-(2a→1b)-2a-O-α-D-xylopyranosyl-(2b→1c)-2b-O-α-D-xylopyranosyl-(2c→1d)-2c-O-α-D-xylopyranosyl-2d-octadecanoate (2), kaempferol-3-O-α-D-xylopyranosyl-(2a→1b)-2a-O-α-D-xylopyranosyl-(2b→1c)-2b-O-α-D-xylopyranosyl-(2c→1d)-2c-O-α-D-xylopyranosyl-2d-hexadecanoate (3), methyl salicylate-2-O-α-D-xylopyranosyl-(2a→1b)-2a-O-α-D-xylopyranosyl-(2b→1c)-2b-O-α-D-xylopyranosyl-(2c→1d)-2c-O-α-D-xylopyranosyl-(2d→1e)-2d-O-α-D-xylopyranosyl-(2e→1f)-2e-O-α-D-xylopyranosyl-(2f→1g)-2f-O-α-D-xylopyranosyl-(2g→1h)-2g-O-α-D-xylopyranosyl-2h-geranilan-8',10'-dioic acid-1'-oate (4), and oleioyl-β-D-arabinoside (5), along with eight known compounds, were isolated from a methanol extract of Oryza sativa straw. The structures of the new compounds were elucidated using one- and two-dimensional NMR spectroscopies in combination with IR, ESI/MS, and HR-ESI/FTMS. In bioassays with blue-green algae, the efficacies of the algicidal activities of the five new compounds (1-5) were evaluated at concentrations of 1, 10, and 100 mg/L. Compound 5 had the highest growth inhibition (92.6 ± 0.3%) for Microcystis aeruginosa UTEX 2388 at a concentration of 100 ppm (mg/L). Compound 5 has high potential for the ecofriendly control of weeds and algae harmful to water-logged rice.
authors.affiliation: Department of Applied BioScience, College of Life and Environmental Sciences, Konkuk University, Seoul 143-701, South Korea.
authors.forename: Ateeque
authors.initials: A
authors.lastname: Ahmad
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Kim
authors.forename: Mohd
authors.initials: M
authors.lastname: Ali
authors.forename: Inmyoung
authors.initials: I
authors.lastname: Park
authors.forename: Jin-Seog
authors.initials: JS
authors.lastname: Kim
authors.forename: Eun-Hye
authors.initials: EH
authors.lastname: Kim
authors.forename: Ju-Jin
authors.initials: JJ
authors.lastname: Lim
authors.forename: Seul-Ki
authors.initials: SK
authors.lastname: Kim
authors.forename: Ill-Min
authors.initials: IM
authors.lastname: Chung
mesh_terms: D000458:Cyanobacteria / Q000187:drug effects* / Q000254:growth & development; D046931:Microcystis / Q000187:drug effects* / Q000254:growth & development; D015394:Molecular Structure; D012275:Oryza / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D018547:Plant Stems / Q000737:chemistry*
chemical_list: D010936:Plant Extracts