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Molecules 2018, 23(2), 278; https://doi.org/10.3390/molecules23020278

Yacon (Smallanthus sonchifolius Poepp. & Endl.) as a Novel Source of Health Promoting Compounds: Antioxidant Activity, Phytochemicals and Sugar Content in Flesh, Peel, and Whole Tubers of Seven Cultivars

1
Department of Agronomy, Institute of Crop Science, University of Hohenheim, Fruwirthstr 23, 70599 Stuttgart, Germany
2
Department of Quality of Plant Products, Institute of Crop Science, University of Hohenheim, Emil-Wolff-Strasse 23, 70599 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 9 January 2018 / Revised: 26 January 2018 / Accepted: 28 January 2018 / Published: 29 January 2018
(This article belongs to the Special Issue The Antioxidant Capacities of Natural Products)
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Abstract

The aim of this study was to evaluate the quality characteristics of seven yacon (Smallanthus sonchifolius Poepp. and Endl.) cultivars (Cajamarca, Cusco, Early White, Late Red, Morado, New Zealand and Quinault) cultivated in the southwest of Germany. The following phyto/chemical traits were investigated in different yacon tuber parts (flesh, peel, and whole tubers): total dry matter, sugar content (fructose, glucose, and sucrose content), total phenolic content (TPC), total flavonoid content (TFC), 2,20-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging activity, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, and Ferric reducing antioxidant power (FRAP). The results indicated a significant interaction between cultivar and tuber part on all of the examined traits (p < 0.0001). Of flesh and whole tuber, cv. Late Red, cv. Morado, and cv. Cajamarca had the highest TPC, TFC, DPPH radical scavenging activity, and FRAP. They also had relatively higher total sugar content. Cv. New Zealand had the lowest amount of sugars, TPC, TFC, DPPH radical scavenging activity, and FRAP, but the highest ABTS radical scavenging activity content in its flesh and whole tuber. Moreover, the results indicated that the peel of yacon tubers contained considerably high amounts of phytochemicals while possessing low sugar contents. Overall, this study provides a broad insight into the phyto/chemical content of yacon tubers from different cultivars, which can be used for further breeding programs, and the selection of proper cultivars for specific food product development. View Full-Text
Keywords: yacon; Smallanthus sonchifolius Poepp. and Endl.; sugar; total phenolic content; total flavonoid content; ABTS radical scavenging activity; DPPH radical scavenging activity; Ferric reducing antioxidant power yacon; Smallanthus sonchifolius Poepp. and Endl.; sugar; total phenolic content; total flavonoid content; ABTS radical scavenging activity; DPPH radical scavenging activity; Ferric reducing antioxidant power
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Khajehei, F.; Merkt, N.; Claupein, W.; Graeff-Hoenninger, S. Yacon (Smallanthus sonchifolius Poepp. & Endl.) as a Novel Source of Health Promoting Compounds: Antioxidant Activity, Phytochemicals and Sugar Content in Flesh, Peel, and Whole Tubers of Seven Cultivars. Molecules 2018, 23, 278.

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