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Flavonoid C-glycosides from star fruit and their antioxidant activity.
- Source :
- Journal of Functional Foods; Jun2015, Vol. 16, p204-210, 7p
- Publication Year :
- 2015
-
Abstract
- Star fruit (the fruit of Averrhoa carambola L., Oxalidaceae) is popular in tropical regions. Chemical study of the fruit yielded four new dihydrochalcone C -glycosides, carambolasides A ( 1 ), B ( 2 ), C ( 3 ), and D ( 4 ), in addition to hovertichoside C ( 5 ), isovitexin 2″- O -α- l -rhamnopyranoside ( 6 ), and carambolaflavone ( 7 ). Their structures were identified by spectroscopic and chemical methods, including electronic circular dichroism (ECD) calculation. Compounds 5 – 7 were reported from the fruit for the first time. Compounds 1 – 7 were evaluated for antioxidant activity using three assays. All of them exhibited 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid) (ABTS) radical cation scavenging activity with IC 50 values ranging from 7.6 to 3.9 µM, which were more potent than l -ascorbic acid (IC 50 = 11.6 µM). However, they were inactive in scavenging 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and in ferric reducing antioxidant power (FRAP). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17564646
- Volume :
- 16
- Database :
- Supplemental Index
- Journal :
- Journal of Functional Foods
- Publication Type :
- Academic Journal
- Accession number :
- 103426037
- Full Text :
- https://doi.org/10.1016/j.jff.2015.04.048