基于ICP-MS结合化学计量学的不同品牌酱香型白酒鉴别方法

Identification of Maotai-flavor Baijiu with different brands based on ICP-MS and chemometrics

为实现不同品牌酱香型白酒的快速分类和鉴别,以4个不同品牌(仙谭、羽丰、普照、红军杯)的酱香型白酒为研究对象,采用电感耦合等离子体质谱法测定了52个白酒样品中的16种元素含量。通过对结果进行z-score标准化,消除各元素间量纲差异,再对其进行主成分分析、聚类分析及偏最小二乘判别分析。结果表明,不同品牌的酱香型白酒间16种无机元素的含量呈显著正相关;聚类分析、主成分分析和偏最小二乘判别能将4个品牌的酒样进行有效区分,其中偏最小二乘判别分析的区分度最好。利用偏最小二乘判别分析结合重要性因子建立验证模型,发现Na、Ca、Al、K等是造成不同品牌酱香型白酒差异性的主要无机元素,所建立的模型能将验证酒样与实验酒样很好地按照品牌归类。综上所述,利用无机元素含量之间的差异及结合适当的化学计量学手段可以快速、准确地对酱香型白酒样品的品牌进行区分和鉴别,为白酒的溯源及真实性鉴定提供理论支撑。

Inductively coupled plasma mass spectrometry was employed to rapidly classify and identify different brands of Maotai-flavor Baijiu.The dimensional differences between the elements were eliminated by z-score standardization,and then principal component analysis(PCA),cluster analysis(CA)and partial least squares discriminant analysis(PLS-DA)were performed.A verification model,established by PLS-DA combined with variable importance projection,was used.The results showed that CA,PCA and PLS-DA had effectively discrimination ability of different brands,and PLS-DA was the best.Na,Ca,Al and K were the main inorganic elements that caused the difference of Maotai-flavor Baijiu.Validation Baijiu samples and experimental Baijiu samples could also be well classified.In summary,the identification methods of Maotai-flavor Baijiu based on ICP-MS and appropriate chemometric methods can provide theoretical support for the traceability and authenticity of Baijiu.