C/N/O/S stable isotopic and chemometric analyses for determining the geographical origin of cultivated in Korea.

BACKGROUND

The geographical origin of Meyer, a valuable medicinal plant, is important to both ginseng producers and consumers in the context of economic profit and human health benefits. We, therefore, aimed to discriminate between the cultivation regions of ginseng using the stable isotope ratios of C, N, O, and S, which are abundant bioelements in living organisms.

METHODS

Six Korean ginseng cultivars (3-yr-old roots) were collected from five different regions in Korea. The C, N, O, and S stable isotope ratios in ginseng roots were measured by isotope ratio mass spectrometry, and then these isotope ratio profiles were statistically analyzed using chemometrics.

RESULTS

The various isotope ratios found in roots were significantly influenced by region, cultivar, and the interactions between these two factors ( ≤ 0.001). The variation in δN and δC in ginseng roots was significant for discriminating between different ginseng cultivation regions, and δO and δS were also affected by both altitude and proximity to coastal areas. Chemometric model results tested in this study provided discrimination between the majority of different cultivation regions. Based on the external validation, this chemometric model also showed good model performance (  = 0.853 and  = 0.738).

CONCLUSION

Our case study elucidates the variation of C, N, O, and S stable isotope ratios in ginseng root depending on cultivation region. Hence, the analysis of stable isotope ratios is a suitable tool for discrimination between the regional origins of ginseng samples from Korea, with potential application to other countries.