Effect of polysaccharide based edible coatings and ascorbic acid on postharvest quality of plum (Prunus Salicina Lindl.) cv. Satluj purple
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Date
2022-08
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G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
The present experiment was carried out at Postharvest Laboratory, Department of Horticulture, College of Agriculture, G.B Pant University of Agriculture and Technology, Pantnagar, Uttarakhand during May 2022 to June 2022. This experiment was laid out in Factorial Completely Randomized Design with two factor comprising of ten treatments (control, 1% chitosan, 2% chitosan, 1% alginate, 2% alginate, 1% ascorbic acid, 1% chitosan+ 1% ascorbic acid, 2% chitosan+1% ascorbic acid, 1% alginate + 1% ascorbic acid and 2% alginate + 1% ascorbic acid) and six storage intervals (0, 7, 14, 21, 28 and 35th day). Thus, 10 treatments combinations were tested in three replications. As soon as the fruits were harvested, they were coated with different edible coatings treatment and stored at low temperature (0 - 4°C) under 80-90% relative humidity for 35 days. During the storage period observations were recorded at seven days intervals. The observations were recorded in respect to fruit diameter, fruit shrinkage, fruit weight, physiological loss in weight, fruit firmness, fruit decay, TSS, titratable acidity, ascorbic acid, total sugar, reducing sugar, non reducing sugar phenol content and antioxidant activity. Findings of present investigation revealed that coating of chitosan, alginate and ascorbic acid was effective in maintaining shelf life and physicochemical traits of plum fruit cv. Satluj Purple as compared to uncoated fruits by imparting more durable protective barrier onto the epicarp of the fruit. Among the all treatments T8 (2% chitosan + 1% ascorbic acid) followed by T10 (2% alginate + 1% ascorbic acid) treatment was found effective in reducing physiological loss in weight, fruit shrinkage, fruit decay along with maintaining fruit firmness, TSS, titratable acidity, ascorbic acid, sugars content, total phenol and antioxidant activity of fruits up to thirty five days of low temperature storage. Thus, it can be concluded that postharvest coatings of plum fruit with 2% chitosan enriched with 1% ascorbic acid was effective in extending the shelf-life and maintaining physico-chemical attributes of plum cv. Satluj Purple for 28 days storage however, they can be stored upto 35 days of storage with minimum changes in physico-chemical quality of plum fruits.