An analytical method for the determination of 14 inorganic elements in 18 Baijiu was developed by inductively coupled plasma tandem mass spectrometry (ICP-MS/MS). The distribution of inorganic elements in Baijiu and the relationship between inorganic elements and different kinds of Baijiu were investigated. After dilution, the Baijiu samples were directly injected into ICP-MS/MS for the determination the contents of Mg, Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Sr, Ba and Pb. In the MS/MS mode, O2 and NH3/He were selected as reaction gases to remove spectral interference. The SPSS principal component analysis and cluster analysis were conducted to evaluate the distribution of inorganic elements after data standardizing. The detection limits for these analytes range from 1.34 to 25.8 ng/L. The recoveries of the samples were between 93.0% and 105%, and the relative standard deviation (RSD) was ≤3.84%. This method has low detection limit, high accuracy, stability and precision. The results of principal component analysis showed that 80.003% of the cumulative variances came from the first five principal components. Al, Fe and Ba may be the characteristic elements in 18 Baijiu. The cluster analysis showed that 18 Baijiu samples formed into four clusters, which could be used for the preliminary discrimination of different kinds of Baijiu. Moreover, the content of inorganic elements from different producing areas in China also showed significant differences, which could be used as an indicator for the discrimination of different Baijiu.
YANG Wenyi
,
HAO Jing
,
TIAN Jiayu
,
HUANG Jianhua
,
CHEN Lin
. Principal component analysis and cluster analysis of inorganic elements in Baijiu using inductively coupled plasma tandem mass spectrometry[J]. Food and Fermentation Industries, 2020
, 46(3)
: 257
-263
.
DOI: 10.13995/j.cnki.11-1802/ts.022562
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