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Steroidal constituents of rice ( Oryza sativa ) hulls with Algicidal and Herbicidal activity against blue–green algae and duckweed
Author(s) -
Chung IllMin,
Ali Mohd,
Ahmad Ateeque,
Chun SeChul,
Kim JungTae,
Sultana Shahnaz,
Kim JinSeog,
Min SukKi,
Seo BoRam
Publication year - 2006
Publication title -
phytochemical analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 72
eISSN - 1099-1565
pISSN - 0958-0344
DOI - 10.1002/pca.961
Subject(s) - chemistry , oryza sativa , bioassay , lemna , microcystis aeruginosa , algae , botany , stereochemistry , cyanobacteria , bacteria , biochemistry , gene , genetics , biology
Two new compounds, 14‐methyl stigmast‐9(11)‐en‐3 α ‐ol‐3 β ‐ d ‐glucopyranoside ( 1 ) and cholest‐11‐en‐3 β , 6 β , 7 α , 22 β ‐tetraol‐24‐one‐3 β ‐palmitoleate ( 2 ), along with the known compound β ‐sitosteryl‐3 β ‐ d ‐glucopyranosyl‐6′‐linoleiate ( 3 ), were isolated from the methanolic extract of rice ( Oryza sativa ) hulls. The structures of the two new compounds were elucidated using one‐ and two‐dimensional NMR in combination with IR, EI/MS, FAB/MS, HR‐EI/MS and HR‐FAB/MS. In bioassays with blue–green algae, Microcystis aeruginosa UTEX 2388 and duckweed, Lemna paucicostata Hegelm 381, the efficacy of bioactivity of the two new compounds linearly increased as the concentration increased from 0.3 to 300 µ m . Compared with momilactone A, compounds 1 and 2 showed similar and higher inhibitory activities against the growth of M. aeruginosa at a concentration of 300 µ m . However, compound 2 was similar to momilactone A in inhibiting L. paucicostata growth at a concentration of 300 µ m . As a result, compound 2 appears to have a strong potential for the environmentally friendly control of weed and algae that are harmful to water‐logged rice. Copyright © 2006 John Wiley & Sons, Ltd.