Quantitative and Qualitative Characterization of Gentiana rigescens Franch (Gentianaceae) on Different Parts and Cultivations Years by HPLC and FTIR Spectroscopy

Table 3

The results for determination of gentiopicroside based on PLSR technique.

Wave number (cm^−1)	Pretreatments		RMSECV		RMSEP	RPD
4000–400	No pretreatment	0.940	11.109	0.794	9.746	2.150
4000–400	MSC + 1 D	0.972	7.083	0.879	7.924	2.645
4000–400	MSC + 2 D	0.968	6.495	0.905	6.730	3.114
1800–800	No pretreatment	0.917	6.981	0.837	9.076	2.309
1800–800	MSC + 1 D	0.927	7.500	0.911	7.068	2.965
1800–800	MSC + 2 D	0.947	6.140	0.938	5.748	3.646