Abstract
A novel coating based on 1.5% chitosan (CH), enriched with or without hairy fig (Ficus hirta Vahl.) fruit extract (HFE), was applied to “Newhall” navel orange for improving the preservation effect. Changes in physicochemical indexes were analyzed over 120 days of cold storage. Uncoated fruit were used as the control. The CH-HFE coating, based on 1.5% CH enriched with HFE, exhibited the best preservation effect and showed the lowest decay rate (5.2%) and weight loss (5.16%). The CH-HFE coating could postpone the ripening and senescence of navel oranges, and maintain higher fruit quality by inhibiting respiration, decreasing the accumulation of malondialdehyde (MDA), and enhancing the activities of protective enzyme, including superoxide dismutase (SOD), peroxidase (POD), chitinase (CHI), and β-1,3-glucanase (GLU), which suggests that CH-HFE coating has the potential to improve the postharvest quality of “Newhall” navel orange and prolong the storage life.
Highlights
Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables, Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables, Tel.: +86-791-8381-3158 (J.C. & C.W.)
Many of the uncoated orange fruits (10.4%) were rotten at the termination of storage, while fruits treated by CH-hairy fig fruit extract (HFE) and 1.5% chitosan coating exhibited significantly lower decay rate than the control group at the level of p < 0.05 (5.2% and 6.8%, respectively)
We found that the changes of CH-HFE and 1.5% chitosan coatings on nutritional components, such as total soluble solid (TSS), titratable acid (TA), and total sugar of “Newhall” navel oranges are probably due to the slowing down of respiration, effectively delaying fruit ripening and senescence
Summary
Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables, Collaborative Innovation Center of Postharvest Key Technology and Quality Safety of Fruits and Vegetables, Tel.: +86-791-8381-3158 (J.C. & C.W.). Vahl.) fruit extract (HFE), was applied to “Newhall” navel orange for improving the preservation effect. The CH-HFE coating could postpone the ripening and senescence of navel oranges, and maintain higher fruit quality by inhibiting respiration, decreasing the accumulation of malondialdehyde (MDA), and enhancing the activities of protective enzyme, including superoxide dismutase (SOD), peroxidase (POD), chitinase (CHI), and β-1,3-glucanase (GLU), which suggests that CH-HFE coating has the potential to improve the postharvest quality of “Newhall” navel orange and prolong the storage life. “Newhall” navel orange (Citrus sinensis L., Osbeck) fruits enjoy great popularity in China and around the world, for their good taste, abundant vitamin, C and widespread availability [1]. A variety variety citrus fruit postharvest quality, without any human, environmental, or plant toxicity [8,9,10]. A of plant-derived plant-derived compounds compounds have have been been recognized recognized and and generally generally regarded regarded as as safe safe (GRAS)
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