Monitoring Molecular Weight Changes during Technical Lignin Depolymerization by Operando Attenuated Total Reflectance Infrared Spectroscopy and Chemometrics.

As this provided an illustrative real‐world example of how online monitoring models can encounter and should deal with unexpected contributions, this sample was kept in the set, and the effect of this anomaly on the modeling efforts is detailed below. An interesting trend in the scores plot, shown in Figure 7 A and marked with the blue ellipse, showed that the drop in the scores on PC1 and PC2 was associated with a concomitant decrease in M w and PD for samples 1–10, after which the M w levels out.

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