基质匹配外标法优化国家标准检测鸡蛋酰胺醇类残留
Matrix-matched external standard method for optimization of China’s national standard for detection of amphenicol residues in eggs
针对酰胺醇类药物在鸡蛋中的残留检测问题,研究开发了一种基于基质配制曲线的外标法,以克服GB 31658.20标准中内标法成本高、线性不佳的缺点。采用乙酸乙酯与氨水的混合溶液作为提取剂,对样品进行处理,结合混合强阳离子交换固相萃取技术进行净化。并运用超高效液相色谱-串联质谱(UHPLC-MS/MS)进行检测。实验结果显示,该方法在鸡蛋基质中对氯霉素、氟苯尼考、甲砜霉素和氟苯尼考胺这4种化合物均表现出良好的线性关系(r>0.99)。该方法的检测限和定量限分别低至0.024~0.096 μg/kg和0.080~0.32 μg/kg,均低于当前的国家标准。通过加标回收实验进一步验证,平均回收率为78.25%~96.70%,相对标准偏差在2.0%~8.7%之间。该方法适用于鸡蛋中酰胺醇类药物及其代谢物的筛查和定量分析,为食品安全检测提供了一种准确、可靠且经济的解决方案。
To address the challenges from detecting amphenicol drugs residues in eggs,a novel external standard method based on matrix-matched calibration curves is developed to avoid the high cost and poor linearity associated with the internal standard method specified in China’s GB 31658.20 standard.In this study,a mixture of ethyl acetate and ammonia water is used as the extraction solvent to process the samples that are further purified through combining with mixed strong cation exchange solid-phase extraction technology.Detection is performed by using ultrahigh performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS).Experimental results demonstrate that this method exhibits excellent linear relationships (r>0.99) for chloramphenicol,florfenicol,thiamphenicol,and florfenicol amine in egg matrices.Furthermore,the detection limits and quantification limits of this method are as low as 0.024-0.096 μg·kg-1 and 0.080-0.32 μg·kg-1,respectively,both below China’s current national standards.It is further verified through spiked recovery experiments that the average recovery rate is 78.25%-96.70%,and the relative standard deviation ranges from 2.0% to 8.7%.This method is suitable for screening and quantitatively analyzing amphenicol drugs and their metabolites remained in eggs,providing an accurate,reliable,and cost-effective solution for food safety testing.
基质效应 / UHPLC-MS/MS / 外标法 / 酰胺醇类药物
matrix effect / UHPLC-MS/MS / external standard method / amphenicol drugs
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