Quantitative and Molecular Similarity Analyses of the Metabolites of Cold- and Hot-Natured Chinese Herbs

Figure 3

Principal component analysis score plots (a) and loading scores (b) (PC1 vs. PC2) of the Chinese herbs. The x-axis is principal component 1 (PC1), and the y-axis is principal component 2 (PC2). PC1 and PC2 describe around 50.1% and 7.86% of the total variability, respectively. In the score plot, red represents hot/warm-natured herbs (hot herbs), and blue represents cold/cool-natured herbs (cold herbs). Furthermore, the numbers correspond to the names of the herbs listed in Table 1. In the loading score, the green squares represent the 20 basic amino acids, and the orange diamonds represent all other metabolites.

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