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Melatonin immersion improves postharvest quality and antioxidant capacity of ‘Nam Dok Mai’ mangoes during storage at ambient temperature
(2025-09-01)
Sangsuk, Punika
;
Supapvanich, Suriyan
;
Wongs-Aree, Chalermchai
;
Pongprasert, Nutthachai
;
Phakawan, Janejira
Importance of the work: Quality loss and delays in ripening in mangoes were explored based on melatonin (MT) immersion as a natural, effective postharvest treatment under ambient conditions. Objectives: To evaluate MT efficacy in preserving the quality, delaying ripening and enhancing oxidative stress resistance in mangoes under ambient storage. Materials and Methods: The mangoes were immersed in water (control) or in a solution of 0.5 mM MT for 1 hr and thereafter stored at room temperature for 10 days. Results: Mangoes treated with 0.5 mM MT had nearly 17% and 60% lower respiration rates and ethylene production, respectively, than untreated ones at the climacteric peak during storage, contributing to a slower ripening process and delayed progression of both peel and pulp coloration. In terms of internal quality, MT application effectively slowed the decline in firmness, suppressed the rise in the total soluble solids-to-titratable acidity ratio. In addition, the MT-treated fruits had enhanced antioxidant defense, as shown by elevated activities of superoxide dismutase, catalase and ascorbate peroxidase. These responses were accompanied by significantly lower levels of hydrogen peroxide, malondialdehyde and lipoxygenase activity, suggesting reduced oxidative membrane damage. Collectively, these findings demonstrated that MT immersion contributed to better quality preservation and improved resistance to postharvest deterioration and disease through modulation of oxidative stress and antioxidant metabolism. Main finding: Subjecting mangoes to postharvest MT treatment was a feasible approach to preserve their postharvest quality and to stimulate antioxidant capability.
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Ultraviolet-C treatment maintains physicochemical quality of water bamboo (Zizania latifolia) shoots during postharvest storage
(2019-06-01)
Wen, Bo
;
Cheng, Zechao
;
Hu, Yanmei
;
Boon-Ek, Yaowapa
;
Wongs-Aree, Chalermchai
Ultraviolet-C (UV-C) treatment has been used as a method to maintain postharvest quality for many kinds of fruits and vegetables. In this study, we investigated the effects of UV-C treatment on physicochemical changes in water bamboo shoots (WBS) during storage. WBS were treated with UV-C at the doses of 0 (control), 1.06, 2.12, 3.18, 4.24, 5.30, and 6.36 kJ m −2 at 20 °C ± 2 °C for 2 d. The increase in greenness of WBS was inhibited by all UV-C treatments, but the 4.24 kJ m −2 UV-C treatment maintained lightness and whiteness index values of WBS better than other treatments. Thus, the 4.24 kJ m −2 UV-C treatment was selected for use to determine the physicochemical quality of WBS during refrigeration at 10 °C. The UV-C treatment retarded the increases in greenness, chlorophyll a, chlorophyll b, and total chlorophyll content, resulting in maintenance of the whiteness index and colour attributes. It also prevented toughness by retarding lignin increase during storage. Moreover, it induced antioxidant activities and bioactive compounds, especially total phenol, and maintained the activities of antioxidant enzymes such as phenylalanine ammonia lyase and catalase during storage. However, the UV-C treatment did not affect ascorbic acid content and the activities of ascorbic acid peroxidase and guaiacol-peroxidase. These results indicated that UV-C treatment at the dose of 4.24 kJ m -2 is a potential alternative for maintaining physicochemical quality and improving the nutritional quality of WBS during storage.

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