Effect of Chitosan/Nano-TiO₂ Composite Coating on Fresh-keeping of Mango

The effect of chitosan single-membrane treatment and chitosan/nano-TiO₂composite coating on the preservation of mango was studied. Micromorphological observation of composite membranes with different amounts of nano-TiO₂ was observed. The results showed that,when mass fraction of chitosan was 1% and nano-TiO₂ content was 0.03% in the chitosan/nano-TiO₂ composite film,the coating treatment could maintain mango fruit hardness,V_C and titratable acid content,delay down the degradation speed of pectin,and maintain cell membrane functionality well. On the 20th day of storage,the yellow index of mango was 58.16%,and the weight loss rate was 6.72%. It was indicated that the chitosan/nano-TiO₂ composite coating had a better preservation effect on mango under 13 ℃ storage conditions.