Calcium and Modified Atmosphere Packaging Improve Sweet Cherry Quality and Extend Shelf Life

Combining calcium chloride and modified atmosphere packaging keeps sweet cherries fresher for longer

Researchers from Uşak University and collaborating institutions in Türkiye have discovered that a postharvest combination of calcium chloride (CaCl₂) and modified atmosphere packaging (MAP) significantly extends the shelf life and preserves the nutritional quality of sweet cherry fruits (Prunus avium L.). The study, published in BMC Plant Biology (2025), highlights how this combined approach maintains biochemical stability, reduces respiration, and slows quality deterioration during cold storage.

Study Overview

Sweet cherries are prized for their bright color, rich flavor, and high antioxidant content, but are also among the most perishable fruits due to their delicate skin and high moisture content. Postharvest losses caused by microbial decay and moisture loss severely limit their storage and transport potential. The research team tested four treatments — control, 4% CaCl₂, MAP, and a combination of both — on “0900 Ziraat” cherries stored for 24 days at 0°C and 90% relative humidity.

Key Results

Weight loss: The control group showed the highest weight loss (9.23%) after 24 days, while the CaCl₂ + MAP treatment maintained the lowest (4.73%), preserving fruit firmness.
Decay rate: The combined treatment significantly reduced fungal decay and microbial spoilage compared to other groups.
Respiration rate: CaCl₂ + MAP reduced CO₂ production by 77%, indicating a slower metabolic rate and delayed ripening.
Biochemical stability: Treated fruits retained higher concentrations of key organic acids (malic, citric, oxalic) and vitamin C.
Phenolic compounds: Levels of gallic acid, rutin, quercetin, and chlorogenic acid remained more stable in CaCl₂ + MAP fruits, maintaining antioxidant capacity and color.

Principal component analysis confirmed that fruits treated with both calcium and MAP clustered closely with high-nutrient biochemical profiles, showing clear separation from untreated control fruits, which degraded more quickly.

Why Calcium and MAP Work Together

Calcium strengthens fruit tissue by stabilizing cell walls and reducing enzyme-driven degradation. At the same time, MAP modifies the surrounding air composition — lowering oxygen and raising CO₂ levels — to suppress respiration and microbial activity. Together, these treatments create a synergistic effect that protects fruit cells from oxidative damage and moisture loss, thereby prolonging freshness without the need for synthetic preservatives.

Implications for the Fruit Industry

The authors suggest that integrating CaCl₂ + MAP into commercial cherry storage and distribution systems could reduce postharvest losses, improve export quality, and ensure that consumers receive cherries with better texture, flavor, and nutritional value. The approach is low-cost, residue-free, and adaptable to existing cold chain logistics.

Conclusion

The study concludes that the combination of calcium chloride and modified atmosphere packaging effectively preserves both the physical and biochemical quality of sweet cherry fruits during storage. By reducing respiration rate, decay, and nutrient loss, this postharvest strategy offers a practical solution for extending the market life of one of the world’s most delicate fruits.

Reference

Çolak, A. M., Çelik, K., Gündeşli, M. A., Gündoğdu, Ö., Küçüker, E., Berk, S. K., Aglar, E., & Gundogdu, M. (2025). Physiological effects of MAP and calcium chloride treatments on biochemical metabolites and quality stability by reducing respiration rate in sweet cherry fruit during storage. BMC Plant Biology, 25(1), 1363. https://doi.org/10.1186/s12870-025-07454-1