Journal
PHYTOCHEMISTRY LETTERS
Volume 7, Issue -, Pages 217-220Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.phytol.2013.12.007
Keywords
Averrhoa carambola; Star fruit; Tetrahydroisoquinoline alkaloids; Antioxidant activity
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Funding
- Knowledge Innovation Program of the Chinese Academy of Sciences [KSCX2-EW-J-28]
- Guangzhou Science and Technology Project [12C14061591]
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The fruit of Averrhoa carambola, commonly known as star fruit or carambola, is popular in Southeast Asia and China. Two new tetrahydroisoquinoline alkaloids, (1R*, 3S*)-1-(5-hydroxymethylfuran-2-yl)-3-carboxy-6-hydroxy-8-methoxyl-1,2,3,4-tetrahydroisoquinoline (1) and (1S*, 3S*)-1-methyl-3-carboxy-6-hydroxy-8-methyoxyl-1,2,3,4-tetrahydroisoquinoline (2), were isolated from the fruit, along with vanillic acid (3), ferulic acid (4), 8,9,10-trihydroxythymol (5), and arjunolic acid (6). Their structures were elucidated by spectroscopic method. Compounds 1, 2, and 5 showed weak ferric reducing antioxidant potency (FRAP) and 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity. (C) 2013 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.
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