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基于电感耦合等离子体-串联质谱技术测定猪肉和鸡肉中32种元素含量

2021-09-05王东刘丽南袁筱玄高镯张春林王岩张岩

肉类研究 2021年7期

王东 刘丽南 袁筱玄 高镯 张春林 王岩 张岩

摘 要:建立电感耦合等离子体-串联质谱(inductively coupled plasma tandem mass spectrometry,ICP-MS/MS)测定猪肉和鸡肉中32 种元素含量的分析方法。样品采用微波消解处理,利用ICP-MS/MS在No gas、He、H2、O2和NH3/He 5 种模式下测定样品中多元素含量,利用目标离子与反应气发生碰撞或反应,用原位质量和质量转移方式消除分析过程中质谱干扰。结果表明:32 种待测元素在0~100 μg/L和0~1 000 μg/L范围内线性关系良好,R2≥0.999 2,检出限为0.000 028~0.130 063 mg/kg,加标回收率为91.6%~109.7%,相对标准偏差≤4.6%;对实际样品进行测定,样品中P、S、K、Na、Ca、Mg等元素含量相对较高,有害元素Cr、As、Cd、Pb的含量符合国家食品安全标准。

关键词:电感耦合等离子体-串联质谱;元素含量;质量转移;猪肉;鸡肉

Abstract: This study established an analytical method for the determination of 32 elements in pork and chicken by inductively coupled plasma tandem mass spectrometry (ICP-MS/MS). The meat samples were pretreated by microwave digestion. The five modes of No gas, He, H2, O2 and NH3/He were used to determine the multi-element contents in the samples by ICP-MS/MS. The target ions were allowed to collide or react with the reactive gas, and in situ mass and mass transfer were adopted to eliminate mass spectral interference during the analysis process. The results showed that all calibration curves exhibited a good linear relationship in the concentration range of 0–100 μg/L or 0–1 000 μg/L with correlation coefficients (R2) ≥ 0.999 2. The limits of detection (LOD) of the proposed method was between 0.000 028 and 0.130 063 mg/kg, and the recoveries of standard addition were between 91.6% and 109.7%, with relative standard deviation (RSD) ≤ 4.6%. High levels of P, S, K, Na, Ca and Mg were detected in actual samples, and the levels of the harmful elements Cr, As, Cd and Pb met the national food safety standards.

Keywords: inductively coupled plasma tandem mass spectrometry; element contents; mass transfer; pork; chicken

DOI:10.7506/rlyj1001-8123-20210223-045

中图分类号:TS207.3                                       文献标志码:A 文章编号:1001-8123(2021)07-0021-06

引文格式:

王东, 刘丽南, 袁筱玄, 等. 基于电感耦合等离子体-串联质谱技术测定猪肉和鸡肉中32 种元素含量[J]. 肉类研究, 2021, 35(7): 21-26. DOI:10.7506/rlyj1001-8123-20210223-045.    http://www.rlyj.net.cn

WANG Dong, LIU Linan, YUAN Xiaoxuan, et al. Determination of 32 elements in pork and chicken by inductively coupled plasma tandem mass spectrometry[J]. Meat Research, 2021, 35(7): 21-26. DOI:10.7506/rlyj1001-8123-20210223-045.    http://www.rlyj.net.cn

肉類食品中富含多种氨基酸、维生素,还为人体提供必需的微量元素,以维持正常的机体功能[1-3],已成为人们生活中必不可少的食物。但由于工业飞速发展,重金属污染物大肆排放,且难以被生物完全降解[4],通过食物链的迁移作用,重金属污染物便大量聚集到生物体内[5-8],

从而严重危害到人类的生命健康。鉴于肉类食品的安全性及营养性,有必要建立一种可以快速、准确测定肉类食品中多种元素含量的分析方法,从而更有利于对各类元素的监测分析[9]。

目前,多种元素同时快速检测技术已有大量研究报道,最常见的包括原子吸收光谱(atomic absorption spectrometry,AAS)法[10-13]、电感……

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