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Effect of Chitosan and Titanium Dioxide Coatings with and without UV Activation on the Postharvest Quality of ‘Nam Dok Mai Si Thong’ Mango

Simona D’Angelo, Panita Ngamchuachit, Paola Pittia, Kanogwan Seraypheap

Abstract


This study aimed to assess the individual and combined effects of chitosan and titanium dioxide (TiO2), with and without UV exposure, on delaying ripening, reducing weight loss, and maintaining postharvest quality of mangoes stored at 25 ± 2 °C for up to 12 days. The evaluation focused on changes in physicochemical properties, antioxidant content, in vitro antioxidant activity, and microbial decay. The coating treatments included: 1) control (C), 2) chitosan (CH), 3) CH–TiO2 (CT), 4) control with UV activation (C-UV), 5) CH with UV activation (CH-UV), 6) CT with repeated UV activation (CT-UV), 7) CT with single UV activation (CT-UV1). CT coatings effectively reduced ethylene production (0.19–0.29 μL/kg.h) and respiration rate (50–78 mg CO₂/kg.h), thereby slowing ripening compared to the control. UV activation did not significantly enhance the suppression of ethylene production or respiration. CT coatings also minimized weight loss (8.34–8.47% vs. 12.62% in C), maintained peel color stability, and better preserved physicochemical properties. In addition, CT coatings delayed the decline in titratable acidity (0.18–0.56% on day 12) and slowed the accumulation of total soluble solids (14.75–14.88 °Brix on day 12). Moreover, antioxidant retention was also improved, as indicated by higher total phenolic content (34.65 mg GAE/g) and FRAP values (110.26 μg TE/g). CT-treated mangoes exhibited the lowest incidence of decay (7.57–7.71%), highlighting the antimicrobial potential of TiO2 and supporting its use as an effective strategy to extend the shelf life of mangoes.

Keywords



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DOI: 10.14416/j.asep.2026.04.009

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