Abstract:
The respiration rates, ethylene production rates, quality indices and electronic nose responses of fruits with different maturity during storage at room temperature(25 ℃ ±1 ℃) were analyzed using Shenzhou honey peaches as materials in this study. The results showed that the maturity(IAD), hue angle(H), firmness, soluble solids contents(SSC) and titratable acid(TA) contents were decreased during storage, meanwhile, the respiration rates of fruits were gradually increased, while the ethylene production rates were improved to the maximum value on the third day and then decreased. The results of principal component analysis(PCA), linear discriminant analysis(LDA) and loading analysis showed that the electronic nose could successfully differentiate the volatile components of Shenzhou honey peaches stored for 0, 3, 6 and 9 days, and the sensors of W1 W, W2 W, W5 S, W1 S and W2 S presented primary roles in distinguishing volatile components among samples. Correlation analysis indicated that these five response signals of electronic nose were significantly negatively correlated with the values of IAD, H, firmness and the contents of TSS and TA(P<0.01). These results would provide a basis for maturity grading of Shenzhou honey peaches and prediction of quality changes during storage by electronic nose technology.