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Controlled Atmosphere Storage and Sorbitol Dipping Minimize Chilling Injuries in ‘Palmer’ Mangoes
oleh: Maryelle Barros da Silva, Vanessa Maria Dantas Pedrosa, Maiqui Izidoro, Tiago Santana Balbuena, Alex Guimarães Sanches, Gustavo Henrique de Almeida Teixeira
Format: | Article |
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Diterbitkan: | MDPI AG 2024-04-01 |
Deskripsi
Our previous studies have shown that ‘Palmer’ mangoes immersed in solutions containing 2.5% sorbitol and stored under a controlled atmosphere (CA) at 8 °C for 30 days had fewer symptoms of a chilling injury. However, there is no information regarding the effectiveness of sorbitol treatment in other atmospheres and/or in combination with lower temperatures. Thus, the objective of this study was to assess the impact of dipping ‘Palmer’ mangoes in 0.1% and 2.5% (<i>w</i>/<i>v</i>) sorbitol solutions and storing the fruit under a CA without atmosphere modification (21 kPa O<sub>2</sub> + 0.03 kPa CO<sub>2</sub>) at 8 °C/95% relative humidity (RH) or with 5 kPa O<sub>2</sub> + 5 kPa CO<sub>2</sub> at 4 °C/95% RH for 28 days. The fruits were evaluated periodically for chilling injuries, quality, and oxidative metabolism. A chilling injury (CI) was correlated with increased fresh weight loss (FWL) and changes in the color of the epicarp (L<sub>peel</sub>, h°<sub>peel</sub>, and C<sub>peel</sub>) and mesocarp (L*<sub>pulp</sub>). Lipid peroxidation (LP<sub>pulp</sub> and LP<sub>peel</sub>) and the hydrogen peroxide content (H<sub>2</sub>O<sub>2peel</sub> and H<sub>2</sub>O<sub>2pulp</sub>) were associated with the development of a CI, particularly after being transferred to ambient. The treatment with 2.5% sorbitol was more effective in minimizing the chilling injury symptoms and did not compromise the fruit quality, especially when it was stored at 4 °C in association with a CA containing 5 kPa O<sub>2</sub> + 5 kPa CO<sub>2</sub>. This treatment reduced lipid peroxidation and increased the activities of the superoxide dismutase (SOD) and ascorbate peroxidase (APX) enzymes in the epicarp and mesocarp, providing greater cold tolerance. The use of 2.5% sorbitol has been identified as the most efficacious approach for mitigating the adverse impacts of chilling injuries, preserving the fruit quality, and enhancing oxidative metabolism, even at lower temperatures. Thus, this treatment represents a viable alternative for managing chilling injuries in mangoes.