Pre-cooling application before cold storage delayed ripening and maintained high antioxidant activity of 'Sonata' sweet cherry
Sweet cherry (Prunus avium L. 'Sonata') fruits were harvested at commercial ripening and transferred immediately at laboratory. Fruits were selected for the following treatments: control (cold storage) and pre-cooling (air pre-cooling and cold storage). After that fruits were stored at 2°C for 4, 8 and 12 days plus an additional period of 2 days at 20°C. Evaluation of quality parameters (weight loss, total soluble solids, acidity, firmness, and colour) revealed that control cherries showed acceleration on the changes of these parameters while in those pre-cooled fruits retardation was observed. In addition, accumulation of total phenolics, total anthocyanins and total carotenoids was also delayed over storage, although final concentrations were always higher in pre-cooled than in control cherries. In conclusion, the application of pre-cooling treatment before cold storage could be a good tool to retard the postharvest ripening process of sweet cherry and in turn to extend the storability of this perishable fruit. Interestingly, at the end of storage pre-cooled cherries showed higher antioxidant activity, in both hydrophilic and lipophilic fractions, than control fruits, showing higher health-beneficial effects for consumers.
Díaz-Mula, H.M., Valverde, J.M., Martínez-Romero, D., Zapata, P.J., Castillo, S. and Serrano, M. (2017). Pre-cooling application before cold storage delayed ripening and maintained high antioxidant activity of 'Sonata' sweet cherry. Acta Hortic. 1161, 561-568
cherry quality, bioactive compounds, pre-cooling treatment, postharvest storage