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Abstract

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Paper | Regular issue | Vol 98, No. 3, 2019, pp. 395 - 402
Published online: 27th February, 2019
DOI: 10.3987/COM-19-14037
Biological Activity of Sinapic Acid Derivatives Isolated from Raphanus sativus

Takaya Ishida, Aki Hasebe, Xingyun Zhao, and Hideyuki Shigemori*

*Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572 Japan

Abstract

Radish sprout (Raphanus sativus) is a vegetable sprout that contains various sinapic acid derivatives. In this study, three sinapic acid derivatives 1-3 isolated from R. sativus, sinapic acid (4), and compounds 5-7, derived from the methylation of compounds 2-4, respectively, were used to investigate the structure-activity relationship for various bioactivities. Compounds with a number of sinapoyl and phenolic hydroxyl groups were found to have antioxidant and angiotensin converting enzyme (ACE) inhibitory activities. In addition, the sugar domains and the phenolic hydroxyl group in sinapoyl group is related to α-glucosidase inhibitory activity. Therefore, these sinapic acid derivatives are promising candidates to move forward to in vivo studies for the treatment of lifestyle-related diseases such as diabetes and hypertension.

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