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GC-IMS analysis of different fermentation stages. (A) Types of volatile compounds at different stages of fermentation; (B) PCA analysis of GC-IMS; (C) 2D topographic maps; (D) The difference comparison topographic maps; (E) Gallery plot of the volatile compounds in different stages of fermentation; (F) PLS-DA score plot of samples. (G) VIP scores of volatile compounds in PLS-DA.
