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Control of postharvest fungal decay in papaya fruits by chitosan-carboxymethyl cellulose coating incorporated with essential oils and potassium sorbate

Suree Nanasombat^*, Saranya Phunpruch

 
ABSTRACT:     The objective of this study was to evaluate the effect of plant essential oils in combination with acid salts for development of edible coating formulations. Firstly, antifungal activities of cinnamon (Cinnamomum verum), clove (Syzygium aromaticum), and colla aromatica Roxb. (Homalomena aromatica) oils and acid salts (ammonium carbonate, potassium metabisulfite, and potassium sorbate) were studied. Cinnamon and clove oils at 0.0125?0.2% minimum inhibitory concentration (MIC) were effective to inhibit growth of Aspergillus flavus TISTR 3041, Penicillium citrinum TISTR 3437, and 2 mold strains, Talaromyces sp. P2D4 and Aspergillus sp. P8A6 isolated from papaya fruits, while those salts showed antifungal activity at 0.5?8% MIC. Combination of cinnamon or clove oil with potassium sorbate showed the synergistic effect against Talaromyces sp. P2D4. Effect of cinnamon or clove oil combined with potassium sorbate in 0.1% chitosan and 0.25% carboxymethyl cellulose (ChiCMC) coating on controlling postharvest fungal decay in papaya fruits during storage at 30 ?C for 8 days was studied. Synergistic combinations of 0.0397% clove oil combined with 0.25% potassium sorbate, or 0.25% cinnamon oil combined with 1% potassium sorbate in the ChiCMC coating were effective to delay fungal decay in papaya fruits. At the end of storage, these coatings significantly showed less decay incidence (53.3?56.7%) compared to a control treatment (100% decay incidence). Thus, use of cinnamon or clove oil combined with potassium sorbate in the ChiCMC coating could potentially be used in the postharvest management for decay control in papaya fruits.

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* Corresponding author, E-mail: snanasombat@gmail.com

Received 18 Jan 2023, Accepted 22 Oct 2023