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

New Flavanol and Cycloartane Glucosides from Landoltia punctata

, , , , *  and *
Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
* Authors to whom correspondence should be addressed.
Received: 26 February 2014 / Revised: 14 May 2014 / Accepted: 16 May 2014 / Published: 22 May 2014
(This article belongs to the Section Natural Products)
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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 (CC BY 3.0).
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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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