Japan Agricultural Research Quarterly: JARQ
Online ISSN : 2185-8896
Print ISSN : 0021-3551
ISSN-L : 0021-3551
Food
Investigation of Total Polyphenol Content, Antioxidant Activity, and Carbohydrate-hydrolyzing Enzyme Inhibition of Yacon Leaves among Four Domestic Cultivars and a Peru Line for over Four Years
Yuto UEDAYasushi MATSUDATatsuro MURATAYoshikazu HOSHIKiyotaka KABATAMasateru ONOHideki KINOSHITAKeiji IGOSHIShin YASUDA
Author information
JOURNAL FREE ACCESS

2021 Volume 55 Issue 4 Pages 347-358

Details
Abstract

Yacon, an Andean crop, was historically introduced into Japan for local consumption of its tuberous roots as a sweet vegetable. We recently examined the multi-functional effects of yacon herbal tea to establish the aerial part as a health food material. The current study aimed to investigate whether any functional differences exist among the yacon leaves from four domestic cultivars—‘Sarada otome’ (SY201), ‘Andesu no yuki’ (SY206), ‘Sarada okame’ (SY217), and ‘Andesu no otome’ (SY237)—and a Peru A line (SY11) maintained for several years in the Aso area of Kyushu. The total polyphenol content (TPC) and antioxidant activity of cultivar SY237 exceeded those of SY11, but the values for individual cultivars were inconsistent over the tested years. In carbohydrate-hydrolyzing enzyme inhibition assays, there was a large variation in all cultivars among the tested years, with three cultivars including SY237 partially demonstrating α-glucosidase inhibition comparable to or stronger than that of SY11. Based on multivariate analysis with functional data from over four years, the characteristic positioning of these yacon cultivars was systematically visualized. As a result, we found that SY237 could be a candidate cultivar that is partially superior to SY11, although the yearly variance should be considered.

Content from these authors
© 2021 Japan International Research Center for Agricultural Sciences
Previous article Next article
feedback
Top