عنوان مجله
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POSTHARVEST BIOLOGY AND TECHNOLOGY
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چکیده
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Banana is a perishable fruit that ripens and deteriorates quickly after harvest. In this work, we investigated the
impact of a dip in carboxymethyl cellulose (CMC) at concentrations of 0.5%, 1.0% and 1.5% on the quality of
harvested bananas during storage at ambient conditions of 20 ± 1 ºC for a 15-d period. It was noted that 1.5%
CMC markedly delayed the occurrence of decay incidence (9%) and suppressed physiological weight loss (6%).
The 1.5% CMC treatment suppressed the activities of chlorophyllase, pheophytinase, Mg-dechelatase and
chlorophyll (Chl)-degrading peroxidase (POD), which ultimately delayed banana peel color changes by
conserving higher total Chl contents and reducing the accumulation of carotenoids. This subsequently resulted in
higher L* and a* along with a lower increase in b* values as compared with control. Banana fruit coated with
1.5% CMC exhibited delayed ethylene and respiration peaks in comparison with control. In the same way, 1.5%
coating maintained higher firmness and showed higher contents of protopectin, chelate-soluble pectin, sodium
carbonate soluble pectin, cellulose and hemicellulose along with lower water-soluble pectin due to reduced
activities of cellulase, pectin methylesterase, polygalacturonase and β-glucosidase. In the same way, postharvest
application of 1.5% CMC coating suppressed the increase in total soluble solids (TSS) and showed higher
titratable acidity (TA) along with a lower ripening index (TSS/TA ratio) in flesh of banana fruit compared with
control. In conclusion, 1.5% CMC application could be an appropriate coating concentration to delay the
ripening and rapid softening of harvested bananas stored in ambient conditions.
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