Abstract

In this study, the feasibility of near infrared reflectance spectroscopy for the quality evaluation of the main bioactive compounds, ginsenosides, in Panax ginseng was examined. Second derivative NIR spectra of standard reagents of ginsenoside Rg₁, Re, Rb₁, Rc, Rb₂ and Rd were used for analysis. Characteristic bands were observed at around 5250 cm⁻¹ in the spectra of ginsenoside Rg₁ group (including Rg₁ and Re); however, this was not to be observed on the spectra of ginsenoside Rb₁ group (including Rb₁, Rc, Rb₂ and Rd). PLS regression models were constructed of air-dry ginseng powder samples and ginsenoside content in ginsengs was determined by HPLC methods. The calibration models covered various types of ginseng (white ginseng, red ginseng and bleached ginseng) from various cultivated areas (Japan, China and Korea) and were well established for each kind of ginsenoside. It was shown that NIR spectroscopy can be used for the accurate prediction of ginsenoside.

© 2018 The Author(s)

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