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超高效液相色谱—串联质谱法测定动物源性食品中甲基睾丸酮残留量

2017-10-20周迎春王林裴刘少博华向美刘会凌彭新然

肉类研究 2017年9期
关键词:固相萃取

周迎春++王林裴++刘少博++华向美++刘会凌++彭新然

摘 要:基于降低样品的基质效应、提高回收率和方法效率,建立采用超高效液相色谱-串联质谱(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)法测定动物源性食品中甲基睾丸酮残留量的方法。分别对样品的提取溶剂和净化方法进行优化,然后用UPLC-MS/MS仪进行测定,外标法定量。结果表明:采用乙腈作为提取溶剂、C18固相萃取柱经甲醇活化后直接上样,且上样量为5 mL时的净化效果最佳。在此条件下,甲基睾丸酮在1~50 ng/mL范围内的线性关系良好,R2≥0.998,方法检出限为0.3 μg/kg,定量限为

1.0 μg/kg;以甲基睾丸酮的添加量分别为1.0、2.0、10.0、40.0 μg/kg的水平进行方法学验证,回收率在70.60%~112.41%之间,相对标准偏差(relative standard deviations,RSD)为4.33%~9.26%。本方法操作简便、成本低、灵敏度高,适用于批量动物源性食品中甲基睾丸酮的残留量检测。

关键词:甲基睾丸酮;超高效液相色谱-串联质谱;动物源性食品;固相萃取

Determination of Methyl Testosterone Residues in Foods of Animal Origin by Using Ultra Performance

Liquid Chromatography-Tandem Mass Spectrometry

ZHOU Yingchun1, WANG Linpei1, LIU Shaobo2, HUA Xiangmei1, LIU Huiling1, PENG Xinran1

(1.Luohe Entry-Exit Inspection and Quarantine Bureau, Luohe 462300, China;

2.Cargill Food (Luohe) Co. Ltd., Luohe 462300, China)

Abstract: An efficient method for the determination of methyl testosterone residues in foods of animal origin with low matrix effect and high recovery was presented by ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS-MS). Samples were extracted with acetonitrile, and the extract was cleaned up on a C18 solid phase extraction column (SPE-C18), concentrated by nitrogen gas blowing, detected by UPLC-MS-MS and quantitated by external standard method. The calibration curve for methyl testosterone exhibited a good linearity with R2 higher than 0.998. The limit of detection (LOD) was 0.3 μg/kg, and the limit of quantification (LOQ) was 1.0 μg/kg. The recoveries of methyl testosterone in spiked samples were in the range of 70.60%–112.41% at spiked levels of 1.0, 2.0, 10.0 and 40.0 μg/kg, with relative standard deviations (RSD) between 4.33% to 9.26%. This method was simple, low-cost, sensitive and suitable for the batch determination of methyl testosterone residues in foods of animal origin.

Key words: methyl testosterone; ultra performance liquid chromatography-tandem mass spectrometry; foods of animal origin; solid phase extraction

DOI:10.7506/rlyj1001-8123-201709011

中圖分类号:O657.6 文献标志码:A 文章编号:1001-8123(2017)09-0063-06

引文格式:

周迎春, 王林裴, 刘少博, 等. 超高效液相色谱-串联质谱法测定动物源性食品中甲基睾丸酮残留量[J]. 肉类研究, 2017, 31(9): 63-68. DOI:10.7506/rlyj1001-8123-201709011. http://www.rlyj.pub

ZHOU Yingchun, WANG Linpei, LIU Shaobo, et al. Determination of methyl testosterone residues in foods of animal origin by using ultra performance liquid chromatography-tandem mass spectrometry[J]. Meat Research, 2017, 31(9): 63-68. DOI:10.7506/rlyj1001-8123-201709011. http://www.rlyj.pubendprint

甲基睾丸酮属于人工合成雄性激素,在动物的苗种培育[1-2]和性别控制等方面作用明显[3-5],但长期摄入可使畜、禽、鱼类机体产生慢性或蓄积毒性,扰乱激素平衡,造成免疫力下降[6]、畸形[7]、死亡等[8-9]。2003年,我国将甲基睾丸酮列为禁用兽药,然而由于甲基睾丸酮可以提高养殖产量,因此仍有不法分子在使用。2016年,我国国家质量监督检验检疫总局将甲基睾丸酮列为动物源性食品的法检项目。目前,水产品及饲料中甲基睾丸酮残留量的测定方法已经比较成熟[10-11],主要包括液相色谱法[12-14]、液相色谱-质谱联用法[15-19]及酶联免疫法[20];……

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