Research Article 
Phytochemical Contents and Antioxidant Activity of Thai Sweet Potato (Ipomoea batatas L.) Extracts
Apirada Manphae, Aphidech Sangdee, Yaowalak Srisuwan and Prasong Srihanam
Asian Journal of Plant Sciences, 2022, 21(3), 499-506.
Abstract
Background and Objectives: Sweet potato composes different phytochemicals which are beneficial effects on human health. This study aimed to evaluate the phytochemical contents and their antioxidant activity of Thai sweet potato (Ipomoea batatas L.) planted in the area of northeastern, Thailand. Materials and Methods: The five different colours of Thai sweet potato were collected and extracted by ethanol-HCl. The various phytochemicals in the extracts were evaluated and antioxidant activity by different assays. Correlation analysis of phytochemicals and antioxidant activity were performed as well as High-Performance Liquid Chromatography (HPLC) analysis. Results: Total flavonoids were found the highest contents in all colours followed by total phenolics while total saponin content was the lowest substance. The antioxidant activity demonstrated that the extracts of Thai sweet potato had high scavenging activity against both DPPH and ABTS radicals. With reducing power activity, the extracts had more potential capacity on cupric than ferric. The different contents and antioxidant activity of the extracts were influenced by the colour of the potato. A high positive correlation between total phenolic, flavonoid and all antioxidant methods was observed. The HPLC analysis revealed that the main substances in the Thai sweet potato extracts were quercetin, catechin, gallic acid and caffeic acid. Conclusion: Thai sweet potato could be suggested as an alternative source of diet for humans according to its phytochemicals and antioxidant activity.
ASCI-ID: 7-2017
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