UPLC-MS/MS法测定杜仲茶中3种农药残留量
2020-05-13何宗桃邓军肖成忠黎秀凤
何宗桃 邓军 肖成忠 黎秀凤



摘 要:应用超高效液相色谱-串联质谱法(UPLC- MS/MS)建立了啶虫脒、吡虫啉、氯虫苯甲酰胺3种农药在杜仲茶中的残留分析方法。样品用乙腈匀浆提取,石墨化碳黑复合氨基柱(Carbon/NH2)净化,UPLC-MS/MS检测,外标法(ESTD)定量。在0.005~0.500 mg/L质量浓度范围内,3种农药的仪器响应值与质量浓度呈良好线性关系(线性回归系数R>0.998);在3个添加水平下(0.01、0.05和0.10 mg/kg)的平均回收率为90.0%~99.5%,相对标准偏差(n=5)为3.29%~10.57%,定量限为0.5 μg/kg。该方法简便快速、灵敏度高、重复性好,适用于检测杜仲茶中3种农药的残留量。
关键词:超高效液相色谱-串联质谱法;杜仲茶;啶虫脒;吡虫啉;氯虫苯甲酰胺;农药残留
中图分类号:S481.8文献标识码:A文章编号:1006-060X(2020)03-0071-03
Abstract: An analytical method using ultra performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) was developed for analysis of 3 kinds of pesticide residues i.e., acetamiprid, imidacloprid and chlorantraniliprole, in Eucommia ulmoides tea. The samples were extracted by acetonitrile homogenate, purified by Carbon/NH2, detected by UPLC-MS/MS and quantified by external standard method (ESTD). In the range of 0.005-0.500 mg/L, there was a good linear relationship between the instrument response value and the mass concentration of three pesticides (linear regression coefficient R > 0.998); the average recovery obtained from 3 spiked concentrations (0.01,0.05 and 0.10 mg/kg) was 90.0% ~ 99.5%, the relative standard deviation (n = 5) was 3.29%-10.57%, and the quantitative limit was 0.5 μg/kg. The method is simple, rapid, sensitive and reproducible, and is suitable for the determination of three pesticide residues in Eucommia ulmoides tea.
Key words: UPLC-MS/MS; Eucommia ulmoides tea; acetamiprid; imidacloprid; chlorantraniliprole; pesticide residues
杜仲是第四纪冰川侵袭后残留下来的古老珍稀树种,是我国名贵的滋补中药材,被誉为“植物黄金”,有补益肝肾、强筋壮骨、调理冲任、固经安胎的功效[1]。杜仲茶是以杜仲叶为原料,经传统茶叶加工及中药饮片加工方法制作而成的健康饮品,品味微苦而回甜上口,其有效成分、药理作用与杜仲皮相似[2]。近年来,张家界慈利县大力发展杜仲产业,利用杜仲木材、树皮、叶、花、果等生产高附加值产品,被誉为“中国杜仲之乡”,种植面积已达1万hm2以上[3-4]。伴随着杜仲产业规模化发展,大面积集中连片种植导致病虫草害日渐严重,种植过程中农药等化学药剂用量逐年上升,杜仲的产量和品质受到一定的影响[5-6]。目前,杜仲中农药残留的测定通常采用气相色谱法,测定的农药种类主要为有机氯和拟除虫菊酯类[7-10],利用超高效液相色谱串联质谱法(UPLC- MS/MS)测定杜仲茶中农药残留的报道较少见。为此……
