Figure 4. Principal component analysis of correlated reaction with Ethanol production. (a) The pH models plotted over the first two principal components (PCs) demonstrated significant differences between pH=5 and other pH models. (b) The first two PCs account for more than 90.18% of data variance. (c) The PCs are a combination of differentiated reactions. The score plot has identified potential reactions that are responsible for the discrimination of pH models.