Abstract:
Application of edible coating as a way of prolonging the shelf-life of perishable fruits
and vegetables is promising. Two plum cultivars (Stanley and Giant) were treated with
1% Chitosan and then stored at 0-1oC and relative humidity of 90±5% for 40 days.
Changes in weight loss, respiration rate, fruit firmness, soluble solid content, titrable
acidity, pH, ascorbic acid as well as decay rate were periodically recorded. The results
indicated that Chitosan coating was effective in reducing weight loss, respiration rate as
well as decay rate. A parallel trend in weight loss and decay rate was observed for both
cultivars. Comparing the two cultivars, ‘Giant’ exhibited higher weight loss and
respiration rate. Weight loss was mitigated through Chitosan application due to its
positive effect in reducing respiration. In addition, Chitosan coating resulted in the
retainment of a higher content of titrable acid, pH as well as firmness in either cultivar.
However, total soluble solids and ascorbic acid contents were not significantly affected by
the coating. The results finally indicated that Chitosan treatment is an effective strategy
for maintaining organoleptic characteristics and as well for the prolonging of postharvest
life in plums.
Keywords: Chitosan, Cold storage, Plum fruits, Respiration rate, Quality.
