Carboxyl methylcellulose (CMC) incorporated with moringa leaf and seed extracts as new postharvest organic edible coating for avocado (Persea americana Mill.) fruit
Organic edible coating products are reported in enhancing fruit quality and their acceptability for postharvest fruit treatment is increasing due to consumers' health awareness. This study investigated a novel edible carboxyl methylcellulose (CMC) containing moringa leaf and seed extracts as 1) a postharvest coating application to improve avocado fruit quality and 2) a postharvest disease control agent that contains antimicrobial properties for reducing disease incidence. Postharvest treatments containing CMC (1% w/v) blended with moringa leaf (MLE) and seed extracts (MSE) (2%) were used to treat 'Hass' or 'Gem' fruit. A CMC containing moringa significantly improved fruit quality of the two cultivars. Treated fruit had a significantly lower mass loss, ethylene and respiration rate compared to the untreated control. Various media of moringa extracts from seed and leaf tissues using different solvents were also tested against postharvest fungi in reference to potato dextrose agarose (PDA) (control). Both moringa leaf and seed extracts had a significant effect on the growth of C. gloeosporioides and A. alternata. Moringa extracts significantly inhibited the growth of the fungi. A result of the image analysis also revealed that a destruction in the hyphal structure for all pathogens, which was exposed to moringa extracts, while their respective control (no moringa extract) remained intact. The results found in this investigation showed that CMC containing moringa extract suppresses or delays postharvest diseases of avocado and improves the shelf life of avocado during storage. The CMC blended with moringa extracts could potentially be commercialized as a new organic edible coating for avocado fruit for future industry application.
Tesfay, S.Z., Magwaza, L.S., Mditshwa, A. and Mbili, N. (2018). Carboxyl methylcellulose (CMC) incorporated with moringa leaf and seed extracts as new postharvest organic edible coating for avocado (Persea americana Mill.) fruit. Acta Hortic. 1201, 161-168
carboxymethyl cellulose (CMC), edible coatings, antimicrobial antioxidant, moringa extract