关键词: 稳定同位素, 碳, 氮, 黑加仑, 产地区分

Abstract:

In this paper, in order to explore the most effective indicator of the geographic origin of blackcurrant
juice, an isotope ratio mass spectrometer (IRMS) was used to analyze the carbon and nitrogen stable isotope ratios in
blackcurrant fruits, leaves, soil and juice. The results showed that the δ15N value of blackcurrant juice from different
regions were different significantly (P ＜ 0.05), and decreased with increasing geographic latitude. The values of δ13C
in juice from different regions showed a significant difference (P ＜ 0.05). Further analysis indicated the carbon stable
isotope ratio in juice had significant correlation with that of fruits and soil (P ＜ 0.05); the nitrogen stable isotope
ratio in juice has a highly significant correlation with that of fruits, leaves and soil (P ＜ 0.01). As a result, combined
analysis of stable carbon and nitrogen isotopes provides potential indicators for tracing the origin of blackcurrant
fruits with accuracy up to 86.9%. In addition, the leaves and soil of blackcurrant are nearly as effective as the fruits in
indicating the growing region with accuracies of 61.5% and 75.0 %, respectively.

Key words: stable isotope, carbon, nitrogen, blackcurrant, growing area discrimination