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目的建立袋泡茶叶中4种黄曲霉毒素G1,B1,G2,B2的高效液相色谱测定方法。方法袋泡茶叶经乙腈水溶液超声提取30 min,多功能固相萃取柱净化,将一定量的提取液转移至衍生瓶中,氮吹仪吹干,用正己烷和三氟乙酸在40℃条件下衍生15 min后氮吹仪吹干,乙腈水溶液定容,采用C18柱分离,甲醇水(45+55)溶液进行洗脱,荧光检测器检测。结果在最适条件下,黄曲霉毒素G1,B1,G2,B2的分离效果好,在2个不同添加水平下,样品的平均回收率在72%~82.3%之间,RSD在3.3%~4.5%之间,线性关系良好,r2>0.9990,四种黄曲霉毒素G1,B1,G2,B2的检出限分别为0.10μg/kg,0.002μg/kg,0.005μg/kg,0.017μg/kg。结论本文的方法灵敏度好、简单、快速、定量准确,适用于袋泡茶叶中黄曲霉毒素G1,B1,G2,B2的同时测定。
Objective To establish a method for the determination of four aflatoxins G1, B1, G2 and B2 in teabag by high performance liquid chromatography. Methods The bagged tea leaves were extracted with acetonitrile aqueous solution for 30 min and cleaned with a multi-functional solid-phase extraction cartridge. A certain amount of extract was transferred to a derivatization flask. The mixture was blown-dry with nitrogen and hexanes and trifluoroacetic acid at 40 ℃ After derivatization for 15 min, the nitrogen blowing machine was blown dry and the acetonitrile aqueous solution was fixed. The residue was separated on a C18 column and eluted with a solution of methanol and water (45 + 55). The fluorescence detector was used for detection. Results Under the optimum conditions, the aflatoxins G1, B1, G2 and B2 had good separation efficiency. The average recoveries of the samples were between 72% and 82.3% at 2 different addition levels with RSD between 3.3% and 4.5% %, The linearity was good, r2> 0.9990. The detection limits of four aflatoxins G1, B1, G2 and B2 were 0.10μg / kg, 0.002μg / kg, 0.005μg / kg and 0.017μg / kg, respectively. Conclusions This method is sensitive, simple, rapid and accurate. It is suitable for simultaneous determination of aflatoxins G1, B1, G2 and B2 in teabag.