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Abstract
In this work, we isolated a new benzofuran glycoside, 6-β-d-glucosyl-6,7-dihydroxy-5-benzofuranpropanoic acid methyl ester (1), together with six known compounds (2–7) from the fruits of Clausena lansium (Lour.) Skeels. Extensive spectroscopic methods were employed to elucidate their structures. Herein, compounds 2, 3, 5 and 6 were reported from Clausena lansium (Lour.) Skeels for the first time. Moreover, compounds 1, 2, 4 and 6 showed comparable 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical scavenging activity to l-ascorbic acid, and compound 4 also exhibited potent 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and ferric reducing antioxidant power (FRAP). All of the compounds showed oxygen radical absorbance capacity (ORAC) values ranging from 0.3 to 3.6 μmol trolex equivalent/μmol. In addition, compounds 3 and 5 also demonstrated good α-amylase inhibitory activity.
Acknowledgements
We have special thanks to associate Prof. Taotao Li, South China Botanical Garden, Chinese Academy of Science, for the identification of Clausena lansium. We also thank Prof. Jianwei Chi and doctor Qin Ma, Sericultural & Agri-Food Research Institute Guangdong Academy of Agricultural Sciences, for helpful suggestions and discussions.
Disclosure statement
The authors declare that there are no conflicts of interest.