Prediction of Total Phenolic Content in Extracts of Prunella Species from HPLC Profiles by Multivariate Calibration

Table 2

RMSEs (mg GAE g⁻¹ dried plant) for the calibration and test sets for the total phenol contents of Prunella L. extracts obtained by modeling with PCR and PLS regression after the chromatograms alignment.

Model	Preprocessing	Number of components	RMSE	RMSEP
PCR	Column centering	6	6.54	6.62
	Smoothing, normalization, and column centering	6	6.63	4.11
PLS	Raw data	6	2.47	1.61
	Smoothing and normalization	6	4.83	2.76