New Flavanol and Cycloartane Glucosides from Landoltia punctata
AbstractChemical investigation on the constituents of Landoltia punctata led to the isolation and identification of 17 compounds, four of which were new and identified as (3b,24S)-9,19-cycloartane-3,22,24,25-tetraol 3-O-[b-D-glucopyranosyl-(1→2)]-[b-D-glucopyranosyl-(1→6)]-b-D-glucopyranoside (1), (3b,24S)-9,19-cycloartane-3,24,25-triol 3-O-[b-d-glucopyranosyl-(1→2)]-[b-D-glucopyranosyl-(1→6)]-b-D-glucopyranoside (2), 3,4'-dihydroxy-7,3'-dimethoxyflavan-5-O-b-D-glucopyranoside (3) and 3,4'-dihydroxy-4,7,3'-trimethoxyflavan-5-O-b-D-glucopyranoside (4). Their structures were elucidated by spectroscopic, chemical, and biochemical methods. Thus, cycloartane triterpenoids were discovered in the Lemnaceae family for the first time. Compound 3 showed antioxidant capacity in the positively charged 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid radical (ABTS+•) and superoxide anion radical scavenging assays.
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Wang, N.; Xu, G.; Fang, Y.; Yang, T.; Zhao, H.; Li, G. New Flavanol and Cycloartane Glucosides from Landoltia punctata. Molecules 2014, 19, 6623-6634.
Wang N, Xu G, Fang Y, Yang T, Zhao H, Li G. New Flavanol and Cycloartane Glucosides from Landoltia punctata. Molecules. 2014; 19(5):6623-6634.Chicago/Turabian Style
Wang, Nini; Xu, Guobo; Fang, Yang; Yang, Tao; Zhao, Hai; Li, Guoyou. 2014. "New Flavanol and Cycloartane Glucosides from Landoltia punctata." Molecules 19, no. 5: 6623-6634.