Determination of Glyphosate and Aminomethyl Phosphonic Acid Residues in Green Coffee by Solid Phase Extraction-Liquid Chromatography Tandem Mass Spectrometry
In order to provide guidance for the use of glyphosate pesticides in coffee cultivation, it is necessary to establish a detection method for analyzing glyphosate and aminomethyl phosphonic acid residues in green coffee. The green coffee powder was extracted by ultrasonic with water at room temperature, lipid-soluble components in the extracts were extracted with dichloromethane, and the supernatant were purified by PCX solid phase extraction. Derivatization reaction was happened between purified solution and 9-fluorenylmethyl chloroformate. Liquid chromatograhy-tandem mass spectrometry was used for analyzing derivative products of glyphosate and aminomethyl phosphonic acid at positive ion mode, and quantified by internal standard. The results of determination of glyphosate and aminomethyl phosphonic acid residues in green coffee by solid phase extraction-liquid chromatography tandem mass spectrometry showed that a good linear relationship was observed between glyphosate and aminomethyl phosphonic acid in the range of 2~100 ng/mL, and the average recoveries ranged from 81.8% to 97.5% at the spiked levels of 0.05, 0.10 and 0.20 mg/kg with the relative standard deviations of less than 9.1%, and the limits of quantification(LOQ) of glyphosate and aminomethyl phosphonic acid were 0.04 mg/kg. The method was applied to FAPAS(19377) proficiency testing with satisfactory results which Z score was-0.4. This method had good linear relations, accuracy and precision met the requirement of quantitative analysis, it was suitable for quantitative analysis of glyphosate and aminomethyl phosphonic acid residues in green coffee.
采用1.3.2步骤对草甘膦空白基质样进行净化,于净化液中分别加入0.05 mL 1 μg/mL混合标准中间液和0.02 mL 10 μg/mL草甘膦-13C2,15N标准溶液,混匀后依次加入0.2 mL硼砂缓冲溶液和0.3 mL氯甲酸-9-芴基甲酯乙腈溶液,分别在10、20、30、40、50、60、70、80 ℃水浴条件下衍生1 h,衍生化反应结束后测定草甘膦、氨甲基膦酸和草甘膦同位素内标的峰面积,考察衍生温度对该衍生反应的影响。
1.3.6 衍生时间对衍生化反应的影响
在衍生温度优选的基础上,采用1.3.2步骤对草甘膦空白基质样进行净化,于净化液中分别加入0.05 mL 1 μg/mL混合标准中间液和0.02 mL 10 μg/mL草甘膦-13C2,15N标准溶液,混匀后依次加入0.2 mL硼砂缓冲溶液和0.3 mL氯甲酸-9-芴基甲酯乙腈溶液,在已优化的衍生温度条件下衍生时间分别设置为0.5、1.0、1.5、2.0、2.5、3.0、3.5、4.0、4.5、5.0、5.5、6.0、6.5、7.0、7.5、8.0、12.0 h,衍生化反应结束后测定草甘膦氨甲基膦酸和草甘膦-13C2,15N的峰面积,考察衍生时间对该衍生化反应的影响。
1.3.7 不同固相萃取小柱净化效果比对试验
于空白基质样品中加入0.5 mL 1 μg/mL混合标准中间液和0.2 mL 10 μg/mL内标标准溶液,采用1.3.2步骤对加标样进行净化,分别以SHIMSEN Styra MCX固相萃取柱、Cleanert PCX固相萃取柱、Oasis HLB固相萃取小柱、Cleanert PEP 官能化聚苯乙烯/二乙烯苯固相萃取柱和C18固相萃取柱为净化小柱,测定其峰面积,与相同浓度的纯标品对比,同时考察5种净化小柱对实际样品的净化效果及基质效应,基质效应以基质因子量化。
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