QuEChERS结合高效液相色谱串联质谱法测定饲料中氯霉素
2021-06-16陈其煌
陈其煌



摘 要:建立QuEChERS结合高效液相色谱串联质谱法测定饲料中氯霉素方法。样品经水相分散后用乙腈提取,经QuEChERS方法净化后,采用高效液相色谱串联质谱法测定,外标法定量。以超纯水和甲醇作为流动相,用Hypersil GOLD C18色谱柱(1.9 μm,2.1 mm×100 mm)进行梯度洗脱,采用电喷雾离子源(ESI-)、负离子扫描多反应监测(MRM)模式进行定性和定量分析。结果表明:氯霉素在5.0~200.0 ng·mL-1的范围内线性关系良好(r=0.9992)。在10.0、20.0、50.0 μg·kg-1添加水平下的回收率为84.2%~89.7%,相对标准偏差(n=6)为6.5%~8.8%,检出限(以信噪比>3计)为0.2 μg·kg-1,定量限(以信噪比>10计)为0.6 μg·kg-1。该方法精密度好,灵敏度高,能简便地准确测定饲料中的氯霉素。
关键词:QuEChERS;高效液相色谱串联质谱法;氯霉素;饲料
中图分类号:S 816.17 文献标志码:A 文章编号:0253-2301(2021)03-0046-07
DOI: 10.13651/j.cnki.fjnykj.2021.03.010
Abstract: This study aimed to establish a method for the determination of chloramphenicol in feed by using QuEChERS combined with the high performance liquid chromatographytandem mass spectrometry method. After water dispersion, the samples were extracted with acetonitrile. And then after the purification by QuEChERS method, the samples were determined by high performance liquid chromatographytandem mass spectrometry and quantified by external standard method. By using the ultrapure water and methyl alcohol as mobile phases, the gradient elution was carried out by Hypersil GOLD C18 column (1.9 μm, 2.1 mm×100 mm). And then the qualitative and quantitative analysis was carried out by using the electrospray ionization (ESI-) and anion scanning multiple reaction monitoring (MRM) modes. The results showed that the linear relation of chloramphenicol was good in the range of 5.0-200.0 ng·mL-1 (r=0.9992). The recoveries at the adding levels of 10.0, 20.0 and 50.0 μg·kg-1 ranged from 84.2% to 89.7%, the relative standard deviations (n=6) were 6.5%-8.8%, the limits of detection (based on S/N>3) were 0.2 μg·kg-1, and the limits of quantitation (based on S/N>10) were 0.6 μg·kg-1. The method had good precision, high sensitivity and could be used to determine the chloramphenicol in feed simply and accurately.
Key words: QuEChERS;High performance liquid chromatographytandem mass spectrometry;Chloramphenicol;Feed
氯霉素(Chloramphenicol,分子式:C11H12Cl2N2O5,分子量:323.14,CAS:56757)屬于酰胺醇类抗生素,是一种广谱抑菌性抗生素,对多种病原菌具有较强的抑制作用,被广泛应用在水产、畜禽养殖上。氯霉素会抑制骨髓细胞中蛋白质的合成,对人类和动物的骨髓细胞和肝细胞具有毒性作用,不仅可引起细胞减少性贫血、血小板减少和再生障碍性贫血,还可导致严重的胃肠道反应、二重感染等,对人体产生毒性[1-2]。为进一步规范养殖用药行为,保障动物源性食品安全,2019年12月27日,农业农村部发布第250号公告,将氯霉素列入食品动物中禁止使用的药品及其他化合物清单。因此,加强对饲料中氯霉素残留的检测具有非常重要意义。
目前,饲料中氯霉素的检测方法主要有酶联免疫吸附测定法(ELISA)[3-5]、气相色谱法[6]、气相色谱质谱联用法[7-8]、高效液相色谱法(HPLC)[9-10]和高效液相色谱串联质谱法(HPLCMS/MS)[11-19],大多采用固相萃取或液液分配萃取净化,前处理操作比较复杂烦琐,溶剂消耗量大。QuEC……
