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. 2024 Mar 15;22:101286. doi: 10.1016/j.fochx.2024.101286

Fig. 2.

Fig. 2

Metabonomic analysis of coffee prepared using the seven primary processing methods. (A) Classification of metabolites based on the HMDB (Human Metabolome Database) 4.0 database, (B) Comparison of metabolite categories, (C) Heatmap analysis, (D) Distribution of coffee samples in the two-dimensional score plot of principal component analysis.