In order to find a safe and efficient edible coating material for the preservation of Orah fruits,a composite coating material was prepared using carboxymethyl chitosan(CMCS)and citronella essential oil(XMC)as raw materials.The physicochemical properties of the composite coating material were tested.The effects of 0.5%citronella essential oil and 1.0%carboxymethyl chitosan coating(0.5%XMC-1.0%CMCS)on the prevention and control of Penicillium italicum and P.digitatum of Orah fruits,as well as on enzyme activity and quality of the fruit were then studied with distilled water as a control.The results showed that the addition of citronella essential oil improved the toughness,integrity,roughness and opacity of the film,and decreased the water vapor transmittance.At the same time,the treatment of 0.5%citronella essential oil and 1.0%carboxymethyl chitosan significantly(p＜0.05)inhibited the incidence of P.italicum and P.digitatum,and the expansion of lesion on the peel of Orah.Compared with control group,the composite coating treatment of 0.5%citronella essential oil and 1.0%carboxymethyl chitosan induced and increased the activities of phenylal-anine ammonia lyase(PAL),peroxidase(POD),polyphenol oxidase(PPO),chitinase(CHI),and the content of phenol,anthocyanins,flavonoids and other resistant substances in Orah peel.The fruit quality was maintained during the entire storage process.In conclusion,adding citronella essential oil into carboxymethyl chitosan improved the whole performance of the composite membrane,and composite of 0.5%XMC-1.0%CMCS coating induced improved disease resistance of postharvest Orah fruits,maintained the fruit quality.
维普
万方数据