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How does controlled-atmosphere storage help preserve apples?

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Learn about food preservation and the various methods to preserve foodstuffs — food preservation An overview of food preservation.

Controlled-atmosphere (CA) storage is a vital technology used by the apple industry to extend the shelf life and maintain the quality of fruit after harvest.1

By precisely regulating the composition of gases within the storage environment, this method effectively slows down the natural aging process of the apples. Specifically, CA storage involves reducing oxygen levels while increasing carbon dioxide concentrations. This adjustment is critical because it retards senescence—the biological process of deterioration—and minimizes the respiration rates of the fruit.2

These conditions can be achieved through various methods, such as utilizing the fruit's own respiration to generate carbon dioxide, which is then managed by scrubbers or hydrated lime, or by flushing the facility with nitrogen gas. By creating this modified environment, producers can prevent undesirable changes in texture, flavor, and color, ensuring that apples remain in high-quality condition for an extended duration.21