Simultaneous quantification of ginsenosides in American ginseng (Panax quinquefolium) root powder by visible/near-infrared reflectance spectroscopy

Near-infrared reflectance spectroscopy (NIRS) was examined as a possible alternative to highperformance liquid chromatography (HPLC) for the analysis of ginsenosides from American ginseng (Panax quinquefolium) root powder (n = 26). NIR spectra were collected over 400-2500 nm. For each sample and individual ginsenoside quantified by HPLC, spectral data were regressed against the chemical data to develop prediction equations. The spectral prediction equations produced high correlation coefficient (1-VR) values and low standard errors of cross validation (SECV) values for the determination of individual and total ginsenosides. The contents of individual ginsenosides, Rb-1, Rb-2, Re, Rd, Re, Rg(1), Ro, m-Rb-1, m-Rb-2, m-Rc, m-Rd, and total ginsenosides (X +/- SECV) were (1.29 +/- 0.18)%, (0.273 +/- 0.096)%, (0.298 +/- 0.052)%, (0.091 +/- 0.027)%, (1.015 +/- 0.114)%, (0.116 +/- 0.018)%, (0.25 +/- 0.040)%, (0.776 +/- 0.116)%, (0.197 +/- 0.074)%, (0.239 +/- 0.083)%, (0.143 +/- 0.042)%, and (4.393 +/- 0.283)%, respectively. The (1-VR) values of cross validation were 0.877, 0.872, 0.955, 0.834, 0.899, 0.919, 0.325, 0.849, 0.902, 0.877, 0.871, and 0.963, respectively. Results indicated that the NIRS method could be used for the analysis of the major ginsenosides, Rbl, Re, and m-Rbl, as well as the total ginsenosides in American ginseng.