Determination of 20 Pesticide Residues in Edible Fungi by Liquid Chromatography-Tandem Mass Spectrometry
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摘要: 本研究建立了食用菌中20种农药残留同时检测的液相色谱-串联质谱(LC-MS/MS)检测方法。样品经含0.1%乙酸的乙腈提取,经无水硫酸镁、N-丙基乙二胺(PSA)净化,以电喷雾电离正离子(ESI+)、多反应检测模式(MRM)进行检测,外标法定量。20种农药在0.005~0.10 mg·kg-1范围内线性关系良好,相关系数大于0.99。该分析方法快速、准确,通过优化前处理和上机条件,在最优条件下进行测试,方法定量下限(S/N>10)为0.005 mg·kg-1,在香菇和白木耳中进行0.05 mg·kg-1加标水平测试,其回收率为65.1%~96.0%,RSD为2.5%~9.0%。该方法适用于食用菌中20种农药测定。
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关键词:
- 液相色谱-串联质谱法 /
- 食用菌 /
- 农药残留
Abstract: A method by combining liquid chromatography with tandem mass spectrometry was developed to determine the residues of 20 pesticides in edible fungi. Samples were extracted using acetonitrile containing 0.1% acetic acid cleaned-up with anhydrous magnesium sulfate and primary secondary amine (PSA). Measurement on the residues was conducted on the extracts under the modes of electrospray positive ionization (ESI+) and multiple reaction monitoring (MRM), using external standards. The calibration curves of the pesticides had a linear relationship with a correlation coefficients greater than 0.99 in the range of 0.005 to 0.10 mg·kg-1. The optimized testing conditions included a lower limits of quantitation (LOQs, S/N>10) at 0.005 mg·kg-1. A test for recovery was performed by adding 0.05 mg·kg-1 standard pesticides to the mushrooms and white fungi. It was found that the recovery rates ranged from 65.1% to 96.0%, with a relative standard deviations of 2.5%-9.0%. It was concluded that the newly developed methodology was rapid and accurate, and could be applied for the determination of the 20 pesticide residues in edible fungi. -
表 1 20种农药的保留时间及质谱分析参数
Table 1. Retention times and mass spectrometric parameters for 20 pesticides
序号 农药品种 保留时间
/min定量定性离子对
/ (m·z-1)源内碎裂电压
/V碰撞气能量
/eV1 Methamidophos (甲胺磷) 4.10 142.1/94.0*,142.1/125.0 80 15,10 2 Acephate (乙酰甲胺磷) 5.82 184.1/143.0*,184.1/95.0 55 4,20 3 Omethoate (氧化乐果) 6.54 214.0/124.9*,214.0/182.9 80 20,5 4 Aldicarb sulfoxide (涕灭威亚砜) 7.00 207.0/89.0*,207.0/132.0 90 8,1 5 Carbendazim (多菌灵) 7.86 192.1/160.1*,192.1/132.1 80 15,20 6 Aldicarb sulfone (涕灭威砜) 8.02 223.1/86.0*,223.1/76.0 80 5,5 7 Thiabendazole (噻菌灵) 8.25 202.1/175.1*,202.1/131.1 120 30,30 8 Methomyl (灭多威) 8.46 163.1/88.1*,163.1/106.1 80 5,10 9 Thiamethoxam (噻虫嗪) 9.08 292.1/181.1*,292.1/211.2 80 10,20 10 Imidacloprid (吡虫啉) 10.19 256.0/209.0*,256.0/175.0 80 10,10 11 Dimethoate (乐果) 10.44 230.0/125.0*,230.0/199.0 80 5,10 12 Acetamiprid (啶虫脒) 10.58 223.1/126.0*,223.1/56.2 120 15,15 13 Carbofuran (克百威) 13.19 222.1/165.1*,222.1/123.1 120 5,20 14 Isoprocarb (异丙威) 14.02 194.1/95.0*,194.1/137.1 80 20,5 15 Triadimenol (三唑醇) 14.46 296.1/70.0*,296.1/99.1 80 10,10 16 Paclobutrazol (多效唑) 14.46 294.2/70.0*,294.2/125.0 100 15,25 17 Triadimefon (三唑酮) 15.00 294.2/69.0*,294.2/197.1 100 20,15 18 Flusilazole (氟硅唑) 15.13 316.1/165.1*,316.1/247.1 120 15,20 19 Malathion (马拉硫磷) 15.28 331.0/99.0*,331.0/127.1 80 5,10 20 Acetochlor (乙草胺) 15.52 270.2/224.0*,270.2/148.2 80 5,20 注:*为定量离子。 表 2 20种农药线性方程、相关系数、回收率、精密度
Table 2. Regression equation, correlation coefficient (R2), recovery and relative standard deviations (RSD) on 20 pesticides
序号 农药 线性方程 R2 香菇(0.05 mg·kg-1) 白木耳(0.05 mg·kg-1) 回收率/% RSD/% 回收率/% RSD/% 1 Methamidophos (甲胺磷) y=864234x + 1097 0.9983 68.2 6.8 70.4 5.7 2 Acephate (乙酰甲胺磷) y=1350776x-2371 0.9949 65.1 7.0 69.0 5.0 3 Omethoate (氧化乐果) y=2746324x + 3810 0.9982 70.5 3.5 68.6 4.8 4 Aldicarb sulfoxide (涕灭威亚砜) y=1617506x + 1051 0.9995 71.5 8.5 76.8 4.6 5 Carbendazim (多菌灵) y=24154383x + 12146 0.9984 94.7 2.6 90.5 3.2 6 Aldicarb sulfone (涕灭威砜) y=4285213x-2027 0.9998 88.0 4.7 92.3 4.0 7 Thiabendazole (噻菌灵) y=14466859x + 11043 0.9996 92.5 3.6 90.1 6.1 8 Methomyl (灭多威) y=6847062x-11964 0.9981 82.5 2.5 88.0 3.8 9 Thiamethoxam (噻虫嗪) y=3443287x-8810 0.9947 84.1 7.8 80.3 5.5 10 Imidacloprid (吡虫啉) y=2561526x-2609 0.9995 91.3 4.9 93.5 3.2 11 Dimethoate (乐果) y=12982119x-22186 0.9991 85.1 3.7 90.2 5.9 12 Acetamiprid (啶虫脒) y=14460171x-13829 0.9994 92.2 4.1 87.1 5.0 13 Carbofuran (克百威) y=35659321x-9149 0.9990 90.8 5.7 96.0 3.3 14 Isoprocarb (异丙威) y=6959892x +5673 0.9980 80.5 6.1 86.6 4.8 15 Triadimenol (三唑醇) y=3950129x + 7471 0.9987 77.3 9.0 72.0 7.2 16 Paclobutrazol (多效唑) y=4973457x + 14745 0.9988 73.0 7.1 77.8 6.0 17 Triadimefon (三唑酮) y=2167825x + 7575 0.9987 70.5 6.8 75.3 3.8 18 Flusilazole (氟硅唑) y=1462023x + 6800 0.9961 90.2 3.2 94.8 4.0 19 Malathion (马拉硫磷) y=4287276x + 7269 0.9976 76.2 4.6 73.1 3.9 20 Acetochlor (乙草胺) y=1307020x + 3363 0.9975 79.6 3.5 84.5 4.8 -
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