应用铅同位素比值和元素含量分析法识别有机鸡样品真实性

探究了鸡中铅同位素与相关元素在有机养殖和常规养殖中的差异性,以探讨有机鸡样品溯源的可能性。相同品种的鸡分别采用有机养殖和常规养殖2种不同的饲养方式,利用电感耦合等离子体质谱分别对有机鸡和普通鸡样品中的铅同位素比值和相关元素含量进行测定。方差分析结果表明,铅同位素比值²⁰⁴Pb/²⁰⁶Pb和P、Zn、Fe、Mn、Mg、Ca、Cu、Na、K元素含量具有显著性差异(p＜0.05)；主成分分析初步表明,Zn、Mn、Mg、Ca、Cu、Na、K为有机鸡和普通鸡样品中的特征无机元素；聚类分析可将鸡样品分为有机养殖和常规养殖两大类,通过判别分析所得模型的初始分组正确率为100.0%,交叉验证正确率为90.0%。利用铅同位素比值(²⁰⁴Pb/²⁰⁶Pb)、相关元素(P、Zn、Fe、Mn、Mg、Ca、Cu、Na、K)含量分析能够对有机鸡进行有效溯源识别,研究结果可为有机鸡的鉴别研究提供新的方法。

Application of Lead Isotope Ratio and Element Content for Identification of Organic Chicken Samples

In order to explore the differences between lead isotope and related elements in organic farming and conventional culture, the possibility of traceability of organic chicken samples was explored. In this study, two different feeding methods, organic farming and conventional breeding, were used for the same breeds of chickens. The lead isotope ratios and related element contents in organic chicken and common chicken samples were determined by inductively coupled plasma mass spectrometry. The results of variance analysis showed that the lead isotope ratios of ²⁰⁴Pb/²⁰⁶Pb and contents of P, Zn, Fe, Mn, Mg, Ca, Cu, Na, K were significantly different (p<0.05). The principal component analysis showed that Zn, Mn, Mg, Ca, Cu, Na, and K were characteristic inorganic elements in organic chicken and common chicken samples. Meanwhile, cluster analysis could divide chicken samples into two categories:organic farming and conventional breeding, and the initial group correcting rate obtained by discriminant analysis was 100.0%, and the cross validation accuracy was 90.0%. The lead isotope ratios of ²⁰⁴Pb/²⁰⁶Pb, and related element contents (P, Zn, Fe, Mn, Mg, Ca, Cu, Na, K) could be used to identify the effective traceability of organic chickens. The results can provide new identification methods for organic chickens.