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• Effects of Chitosan-Plant Extract Coatings on the Postharvest Quality of Mango Fruits (Mangifera indica) with Anthracnose Disease

  Nguyen Thi Thu Nga, Nguyen Xuan Bac

  Received: May 22, 2020 / Published: Dec 31, 2021

   Abstract PDF

  Anthracnose is the most prevalent and devastating fungal disease both before and after harvesting of mango worldwide. The anthracnose pathogen infects fruit in the field and remains quiescent until the fruit is harvested and starts to ripen. This is the major constraint in the commercialization of fresh mango. Currently, this is the first study that has evaluated the impact of a chitosan-based coating with Aloe vera gel and papaya leaf extracts on the postharvest quality of mango fruit infected with anthracnose under ambient storage conditions. After coating and drying, mangoes were artificially inoculated with Colletotrichum gloeosporioides (105 conidia per mL) and then air-dry, placed in perforated open-top plastic baskets, and stored at room conditions (average temperature 34.3 ± 2°C and relative humidity 71.8 ± 10%). The respiration rate, weight loss, color, firmness, vitamin C content, and spoilage rate were measured during storage. The results showed that the coating formula made with 0.5% chitosan combined with 0.3 % Aloe vera gel and 0.2% papaya leaf extracts was the most effective formula for maintaining postharvest quality and minimizing the spoilage of mango fruit infected with anthracnose under ambient conditions. Further in-depth studies are needed to determine both the mode of action in the successful commercialization of this new edible coating in the fresh mango fruit industry. 

• Effects of Aloe Vera Gel Coatings on the Postharvest Quality of Honeydew melons (Cucumis melo L.) Stored Under Atmospheric Condition

  Nguyen Thi Hanh, Phan Thi Phuong Thao, Nguyen Thi Bich Thuy, Nguyen Thi Thu Nga

  Received: Aug 20, 2018 / Accepted: Aug 20, 2018 / Published: Aug 20, 2018

   Abstract PDF

  Honeydew melon (Cucumis melo L.) is a highly nutritious fruit, but its climacteric respiration property leads to rapid quality degradation, a short shelf-life, and low marketability. The objective of this study was to evaluate the effects of Aloe vera gel coating on postharvest quality of honeydew melon cv. Ngan Huy under atmospheric conditions. The fresh fruits were completely immersed into Aloe vera gel solutions at different concentrations of 30%, 40%, 50%, 60%, and 70% at room temperature for 5 minutes. Tween 80 0.05%, CMC 1%, and glycerol 2% were added in the coating solutions. Thirty-six fruits were used in each treatment. The weight loss, firmness, respiration, and ethylene production rates, total soluble solids (TSS) and vitamin C content, and the rate of fruit spoilage were measured during storage to determine the efficacy of the Aloe vera gel in maintaining the postharvest quality of the honeydew melon fruits and protecting them from deterioration. Uncoated fruits exhibited significantly greater changes (P<0.05) in weight loss, firmness, respiration, ethylene production rates, TSS, and vitamin C content compared to coated fruits. Fruits coated with 60% or 70% Aloe vera gel exhibited the smallest changes (P<0.05) in all the tested parameters. Based on the changes of the overall quality characteristics, application of an edible coating with 60% or 70% of Aloe vera gel were considered to be the most suitable practice to maintain the quality of honeydew melon.