Effect of Aloe vera gel-based edible coating on microbiological safety and quality of tomato

Abstract

This study investigated the effects of Aloe vera gel (AVG) based on edible coating solutions on tomatoes to maintain the postharvest quality during storage at 10°C for 30 days. The AVG coating solutions were prepared with different percentages of extracted gel ranging from 0 to 80% with addition to calcium chloride (2%), ascorbic acid (4%), carboxymethyl cellulose (3%), glycerol (2%), and oleic acid (3 mL). Results showed that coating solutions containing 60 to 80% AVG had better results than coating solutions containing 0 to 40% gel. Contents of ascorbic acid, sugar, flavonoids, carotenoids, lycopene, and pectin remained higher, and total microbial count remained lesser in fruits treated with a higher concentration of AVG over the storage time. Tomatoes coated with 60% and 80% Aloe vera gel also showed maximum antioxidant efficiency, absence of E. coli, and no signs of fungal (Botrytis cinerea) growth on tomatoes. In conclusion, applying 60–80% AVG edible coatings might be suggested to maintain the postharvest quality of tomato fruit.

Keywords

• Post-harvest
• quality
• shelf life
• tomatoes
• Aloe vera gel coating
• Poscosecha