Graduate Thesis Or Dissertation
 

Storage quality of red raspberries, blackberries and blueberries : effects of delayed cooling and package types

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  • 'Amity' red raspberries, 'Chester' blackberries and 'Earliblue' blueberries were subjected to different cooling treatments at 0°C and placed in storage at 0°C. Fruits were cooled 2-4 times faster with forced-air cooling than with room cooling. Cooling treatments had no effect on decay, soluble solids content or citric and malic acid concentrations during storage. Weight loss of blackberries and firmness of red raspberries were also not affected by cooling treatments. Immediately room cooled fruits of red raspberry lost less weight than forced-air cooled fruits. Delayed cooling of 4 hr for red raspberry and 8 hr for blueberry increased weight loss during storage. Total anthocyanin of red raspberries increased with longer delays in cooling and became more apparent at later storage stages. 'Meeker' red raspberry and 'Chester' blackberry fruits were precooled in different package types at 0°C and held in storage at 0°C. The cooling times for both berries were shortest in open top packages followed by packages with pin-holed film caps. Package type had no apparent effect on decay, total anthocyanin, soluble solids or citric and malic acid concentrations of red raspberries and blackberries during storage. Weight loss was greater in fruits packaged without cover. Berry quality was generally much more dramatically affected by storage duration. Weight loss and decay increased while anthocyanin increased initially after harvest but then remained unchanged during later storage stages. Soluble solids changed very little but citric and malic acid generally decreased or remained constant. 'Amity' and 'Meeker' red raspberries could be held up to 15 days at 0°C with less than 3% decay, and with weight loss less than 5 percent. 'Chester' blackberries could be kept up to 20 days with both decay and weight loss less than 4 percent. The storage time of blueberries was unexpectedly very short (not more than 7 days) in this study. Rains prior to harvest likely resulted in earlier and more extensive decay.
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