新疆红枣营养品质与稳定同位素及矿物元素特征产地溯源比较

为开发基于营养品质、稳定同位素及矿物元素分析的不同产地新疆红枣地理标志产品溯源新方法,本研究采集了 2016年新疆不同产区(若羌、和田、阿克苏、麦盖提等15个县市)97个红枣种植地块的50份灰枣和47份骏枣样本,测定其果肉中13类营养品质指标(蛋白质、还原糖、自由氨基酸、总黄酮等),稳定碳、氮、氢、氧同位素比率(δ13...

Comparison of the Nutrient Quality,Stable Isotope and Multi-Element Characteristics of Xinjiang Jujube for Origin Traceability

This study aimed to develop new different origin traceability methods for Xinjiang protected geographical indication(PGI) jujube products using nutrient quality, stable isotope and multi-element characteristics. 50 Hui jujube and 47 Jun jujube samples were collected from 97 fields in 15 farming regions of Xinjiang province (Charkhlik, Khotan, Aksu and Markit, etc.). 13 nutrient quality indexes (protein, reducing sugar, free amino acids, total flavonoids, etc.), isotope ratios of stable carbon, nitrogen, hydrogen, oxygen(δ¹³C, δ¹⁵N, δ²H, δ¹⁸O), and 21 trace element contents (Na, Mg, K, Fe and Zn, etc.) were determined. One-way ANOVA was applied for the difference comparison of single nutrient quality, stable isotope and multi-element characteristics (P<0.05) of jujubes between regions. Partial least squares-discriminant analysis (PLS-DA) modeling of these two kinds of signatures showed that stable isotope and multi-element of jujubes were more significantly different than nutrient quality, which can improve the discriminant accuracies of origin traceability. The discriminant accuracies using nutrient indexes were just 86.00% and 85.11% for Hui jujube and Jun jujube, while they can be improved to 94.12% and 95.74% using stable isotope and multi-element signatures, respectively. Notably, the accuracies for two PGI jujubes (Charkhlik Hui jujube and Khotan Jun jujube) were up to 100%, and the mis-discriminant probability was 0%. Therefore, this strategy maybe promising to be a reliable tool for origin traceability of Xinjiang PGI jujube products.