Fig 1.
The response results of the electronic nose and electronic tongue.
Radar chart of electronic nose (a) and electronic tongue (d) responses. Principal component analysis (PCA) score plot for electronic nose (b) and electronic tongue (e). PCA loading plot for electronic nose (c) and electronic tongue (f) data.
Table 1.
The signal peak of VOCs detected by HS-GC-IMS.
Fig 2.
(a) 3D topographic plot; The horizontal coordinate of the signal peak indicates the drift time of VOC, the vertical coordinate indicates measurement run time, and the volume of the signal peak indicates the concentration of VOC. (b) 2D topographic plots; The color spots on either side of the reactive ion peak (RIP) represent the response signal peaks of the substance, and their shades indicate the concentration of that substance. Using group A as a control, blue spots signify that the flavor compounds are below the values of group A, while red spots indicate higher values than group A. (c) Gallery plot. “M” represents monomer, and “D” stands for dimer. (d) PLS-DA score plots and (e) VIP values of samples during different processing.
Fig 3.
Pathway enrichment analysis of differential metabolites of Double-Layer Steamed Milk Custard during different processing.
Fig 4.
Changes in metabolites during the processing of Double-Layer Steamed Milk Custard.
Fig 5.
Relationship between key volatile organic compounds and differential metabolites.