Molecules 2014, 19(5), 6623-6634; doi:10.3390/molecules19056623
Article

New Flavanol and Cycloartane Glucosides from Landoltia punctata

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Received: 26 February 2014; in revised form: 14 May 2014 / Accepted: 16 May 2014 / Published: 22 May 2014
(This article belongs to the Section Metabolites)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Chemical 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.
Keywords: Landoltia punctata; flavanol glucoside; cycloartane glucoside; antioxidant
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MDPI and ACS Style

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.

AMA Style

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.

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