Abstract:

In this study, a portable electronic nose PEN3 was used for the aroma analysis of Jiubao juicy peach, an early-ripening cultivar in order to provide experimental references for the evaluation of its freshness. Dynamic aroma sampling was achieved using PEN3 and the response values of the instrument were obtained. This was followed by data analysis using principal component analysis (PCA) and linear discrimination analysis (LDA). The results showed that the use of LDA was able to better discriminate peaches on the 1st, 2nd to 4th, and 5th to 7th days of postharvest storage in polyethylene bags under the conditions of (20 ±0.5 )℃ and 65%－70% relative humidity. According to cross-validation analysis, the discrimination accuracy among these samples stored for different storage periods was as high as 91%. Meanwhile, it was indicated by loading analysis that sensors W1S, W2S and W2W played a central role in evaluating the freshness of juicy peach, which provides useful evidences for the optimization of sensors and exploration into a simple and convenient non-destructive technique for the evaluation of juicy peach freshness.

Key words: Jiubao juicy peach, electronic nose, freshness, evaluation