关键词: 大菱鲆, 气相离子迁移谱, 静电场, 品质, 电子鼻

Abstract: The effect of electrostatic field on the storage quality of turbot was studied by examining the changes in total bacterial count (TBC), Pseudomonas aeruginosa count, total volatile basic nitrogen (TVB-N) content and thiobarbituric acid (TBA) value under different storage conditions. The odor fingerprint information was collected by electronic nose and the volatile substances were analyzed and identified by gas chromatography-ion mobility spectrometry (GC-IMS). The results showed that electronic field could significantly preserve the quality of Scophthalmus maximus during storage by inhibiting the growth of TBC and the dominant spoilage bacteria and reducing the increase in TVB-N and TBA values, and suppressed lipid oxidation. The quality of turbot with different storage times and different treatments could be distinguished by using principal component analysis (PCA) and linear discriminant analysis (LDA). According to the GC-IMS fingerprints, the volatile substances of turbot with different storage times and different treatments could be distinguished by heatmap cluster analysis. With the characteristics of rapidity, accuracy and non-destructiveness, the combination of GC-IMS and electronic nose is feasible to detect the freshness and quality of S. maximus.

Key words: Scophthalmus maximus, gas chromatography-ion mobility spectrometry, electronic field, quality, electronic nose