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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 / Revised: 14 May 2014 / Accepted: 16 May 2014 / Published: 22 May 2014
(This article belongs to the Section Metabolites)
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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 Landoltia punctata; flavanol glucoside; cycloartane glucoside; antioxidant
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.

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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.

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