Measurement of Antioxidant Activity of Soldam Plum (Flesh, Peel) by Different Drying Time

Abstract

Purpose: The purpose of this study was to determine the optimal hot air drying time to use Asian Soldam plum to be utilized as a functional food ingredient, and to this end, the antioxidant components and activity changes of Soldam plum (both flesh and peel) applied with various drying times (0, 12, 18, 24 h) at 70°C were compared and analyzed.Methods: Samples of Soldam plum flesh and peel, which had undergone hot air drying, were subjected to hot water extraction, and their antioxidant components (total polyphenol and total flavonoid contents) as well as antioxidant activity (DPPH and ABTS radical scavenging capabilities) were measured.Results: The physiological activities of the hot water-extracted flesh and peel exhibited an increase with drying time, peaking at 18 h, compared to the fresh (not dried) counterparts, but decreased at 24 h. The highest level of antioxidant activity was observed in the peel of Soldam plum dried for 18 h.Conclusion: Optimal physiological activity in the peel of Soldam is achieved when it is dried for 18 h using hot air. In future product development utilizing dried Soldam plum, an 18 h drying period is recommended. Additionally, further research should explore enzyme activity and anti-inflammatory properties in addition to antioxidant activity.