Affiliation:
1. Institute of Marine Biochemistry Vietnam Academy of Science and Technology VAST) 18 Hoang Quoc Viet, Cau Giay 10072 Hanoi Vietnam
2. Graduate University of Science and Technology VAST 18 Hoang Quoc Viet, Cau Giay 10072 Hanoi Vietnam
3. Hai Phong University of Medicine And Pharmacy 72A Nguyen Binh Khiem, Ngo Quyen 180000 Hai Phong Vietnam
4. Institute of Chemistry VAST 18 Hoang Quoc Viet, Cau Giay 10000 Hanoi Vietnam
5. Vietnam National Museum of Nature VAST 18 Hoang Quoc Viet, Cau Giay 10000 Hanoi Vietnam
Abstract
AbstractFour undescribed phenolic glycosides including three stilbene derivatives (1 and 3) and sodium salt of 3 (2), and a chalcone glycoside (4), together with thirteen known compounds (5–17) were isolated from the leaves of Syzygium attopeuense (Gagnep.) Merr. & L.M.Perry. Their chemical structures were elucidated to be (Z)‐gaylussacin (1), 6′′‐O‐galloylgaylussacin sodium salt (2), 6′′‐O‐galloylgaylussacin (3), 4′‐O‐[β‐D‐glucopyranosyl‐(1→6)‐glucopyranosyl]oxy‐2′‐hydroxy‐6′‐methoxydihydrochalcone (4), gaylussacin (5), pinosilvin 3‐O‐β‐D‐glucopyranoside (6), myricetin‐3‐O‐(2′′‐O‐galloyl)‐α‐L‐rhamnopyranoside (7), myricetin‐3‐O‐(3′′‐O‐galloyl)‐α‐L‐rhamnopyranoside (8), myricetin‐3‐O‐α‐L‐rhamnopyranoside (9), quercitrin (10), myricetin‐3‐O‐β‐D‐glucopyranoside (11), myricetin‐3‐O‐β‐D‐galactopyranoside (12), quercetin 3‐O‐α‐L‐arabinopyranoside (13), myricetin‐3‐O‐2′′‐O‐galloyl)‐α‐L‐arabinopyranoside (14), (+)‐gallocatechin (15), (−)‐epigallocatechin (16), and 3,3’,4’‐trimethoxyellagic acid 4‐O‐β‐D‐glucopyranoside (17) by the analysis of HR‐ESI‐MS, 1D and 2D NMR spectra in comparison with the previously reported data. Compounds 1–3, 5, and 6 significant inhibition of NO production in LPS‐activated RAW264.7 cells, with IC50 values ranging from 18.37±1.38 to 35.12±2.53 μM, compared to a positive control (dexamethasone) with an IC50 value of 15.37±1.42 μM.
Funder
Vietnam Academy of Science and Technology
Subject
Molecular Biology,Molecular Medicine,General Chemistry,Biochemistry,General Medicine,Bioengineering