The effect of storage temperature on antioxidant capacity and storability of paprika

Abstract

Storage temperature profoundly influences the storability of paprika (Capsicum annuum L.). However, the impact of storage temperature on storability and its association with the antioxidant activity of paprika are poorly understood. In this study, we evaluated the storage attributes, activity, and gene expression levels of antioxidant enzymes in paprika stored at 4, 10, and 20° for 14 d and then at 20° for an additional 5 d (14+5 d; retail conditions). Storage at 10°C effectively mitigated pitting, stalk browning, shriveling, and decay while significantly enhancing the marketability of paprika. The fruits stored at 4°C were prone to pitting, whereas those stored at 20°C were sensitive to stalk browning and decay. Moreover, paprika stored at 10°C exhibited higher 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) activity and total phenolic content than those stored at 4 and 20°C, indicating improved antioxidant activity. Additionally, storage at 10°C upregulated the expression levels of the antioxidant genes, catalase and peroxidase, suggesting the mechanism underlying the quality enhancement of paprika. Our findings suggest that paprika storage at 10°C alleviates chilling injuries, preserves the quality and marketability, and enhances the antioxidant potential of paprika. These findings provide insights into how temperature influences the quality and minimizes post-harvest losses during the storage and distribution of paprika.