New Flavanol and Cycloartane Glucosides from Landoltia punctata

Molecules

Nini Wang²  Guobo Xu²  Yang Fang²  Tao Yang²  Hai Zhao¹ 

[1] id="af1-molecules-19-06623">Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, Chi

关键词: Landoltia punctata;    flavanol glucoside;    cycloartane glucoside;    antioxidant;   

DOI  :  10.3390/molecules19056623

来源: mdpi

【 摘 要 】

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 (3β,24S)-9,19-cycloartane-3,22,24,25-tetraol 3-O-[β-d-glucopyranosyl-(1→2)]-[β-d-glucopyranosyl-(1→6)]-β-d-glucopyranoside (1), (3β,24S)-9,19-cycloartane-3,24,25-triol 3-O-[β-d-glucopyranosyl-(1→2)]-[β-d-glucopyranosyl-(1→6)]-β-d-glucopyranoside (2), 3,4'-dihydroxy-7,3'-dimethoxyflavan-5-O-β-d-glucopyranoside (3) and 3,4'-dihydroxy-4,7,3'-trimethoxyflavan-5-O-β-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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.