建立了基于QuEChERS技术结合固相萃取(Solid-phase extraction,SPE)的气相色谱/四极杆-飞行时间串联质谱法(Gas chromatography-quadrupole time of flight mass spectrometry,GC-Q-TOF/MS)对牛奶中的11种有机磷农药(速灭磷、甲拌磷、...建立了基于QuEChERS技术结合固相萃取(Solid-phase extraction,SPE)的气相色谱/四极杆-飞行时间串联质谱法(Gas chromatography-quadrupole time of flight mass spectrometry,GC-Q-TOF/MS)对牛奶中的11种有机磷农药(速灭磷、甲拌磷、二嗪磷、甲基对硫磷、杀螟硫磷、水胺硫磷、溴硫磷、杀扑磷、p,p'-DDE、三唑磷、p,p'-DDT)残留量进行测定。称取牛奶,以10 mL乙腈提取后,盐析离心,氮吹,乙酸乙酯复溶,氮吹浓缩。乙酸乙酯层用石墨化炭黑(Graphitized carbon black,GCB)固相萃取柱净化后,供GC-Q-TOF/MS测定。采用电子轰击离子源(Electron ionization,EI)进行电离,质谱飞行时间模式对目标母离子和子离子进行测定。结果表明,11种有机磷类农药在浓度为10~500μg/L的基质曲线范围内呈良好线性关系。该方法具有操作简便、快速高效、回收率高、灵敏度高、重复性好等优点,可用于测定牛奶的11种有机磷类农药残留量。展开更多
The maximum level of organophosphate pesticide residues in rice is 0.1 mg/kg and 0.5 mg/kg in vegetables. The control of pesticide residues in agricultural products required a method of analysis quickly and accurately...The maximum level of organophosphate pesticide residues in rice is 0.1 mg/kg and 0.5 mg/kg in vegetables. The control of pesticide residues in agricultural products required a method of analysis quickly and accurately. The research developed a biosensor for the detection of organophosphate pesticide residues in agricultural products. The research studied immobilized organophosphate hydrolase (OPH) mass and characterization of biosensor. The solution conductivity measurement in the conductivity cell consists of a 1 × 5 mm2 pair of electrodes screen printed carbon electrode (SPCE). The instrument is a converted local conductometer. From the results of study concluded that the optimum performance of the biosensor was obtained from the 105 μg OPH, at pH 8.5 with a response time of 45 seconds. In that condition the sensitivity of biosensor is 28.04 μS/ppm and 0.18 ppm detection limit and the maximum concentration of pesticide which can be measured is 1 ppm. Biosensors have been applied to measure pesticide residues in some vegetable samples.展开更多
Phosphosites in the human proteome represent an excellent source of potential biomarkers of pesticide toxicity. In fact, experimental animal models as well as in vitro studies have revealed phosphorylation disruption ...Phosphosites in the human proteome represent an excellent source of potential biomarkers of pesticide toxicity. In fact, experimental animal models as well as in vitro studies have revealed phosphorylation disruption associated to metabolic regulation, hormone signaling, neuronal function and differentiation, cell survival and death. Due to their estrogen-mimicking ability, pesticides are considered as prime etiological suspects of increasing tumor incidence. Evidences of alterations in the signal transduction pathways involved in the tumor progression stage of pesticides were also provided. Despite progress in understanding the effect of pesticides on the human phosphorproteome and their health outcomes, it remains a complex issue to be studied. By now, the potential impact of pesticides in epigenetic phosphorylation pathways remains poorly explored. In addition, studies involving pesticides mixtures effects are needed. This review updates and provides a comprehensive discussion on the molecular and biochemical events underlying protein phosphorylation pathway disruption caused by pesticides most frequently detected in human tissues and fluids, such as organochlorine pesticides and organophosphates. The link between epidemiological studies and experimental approaches is also considered. Future challenges, such as micro-array phosphoproteome studies to complement gene expression arrays to understand the mechanisms involved in pesticide toxicology are briefly discussed.展开更多
文摘建立了基于QuEChERS技术结合固相萃取(Solid-phase extraction,SPE)的气相色谱/四极杆-飞行时间串联质谱法(Gas chromatography-quadrupole time of flight mass spectrometry,GC-Q-TOF/MS)对牛奶中的11种有机磷农药(速灭磷、甲拌磷、二嗪磷、甲基对硫磷、杀螟硫磷、水胺硫磷、溴硫磷、杀扑磷、p,p'-DDE、三唑磷、p,p'-DDT)残留量进行测定。称取牛奶,以10 mL乙腈提取后,盐析离心,氮吹,乙酸乙酯复溶,氮吹浓缩。乙酸乙酯层用石墨化炭黑(Graphitized carbon black,GCB)固相萃取柱净化后,供GC-Q-TOF/MS测定。采用电子轰击离子源(Electron ionization,EI)进行电离,质谱飞行时间模式对目标母离子和子离子进行测定。结果表明,11种有机磷类农药在浓度为10~500μg/L的基质曲线范围内呈良好线性关系。该方法具有操作简便、快速高效、回收率高、灵敏度高、重复性好等优点,可用于测定牛奶的11种有机磷类农药残留量。
文摘The maximum level of organophosphate pesticide residues in rice is 0.1 mg/kg and 0.5 mg/kg in vegetables. The control of pesticide residues in agricultural products required a method of analysis quickly and accurately. The research developed a biosensor for the detection of organophosphate pesticide residues in agricultural products. The research studied immobilized organophosphate hydrolase (OPH) mass and characterization of biosensor. The solution conductivity measurement in the conductivity cell consists of a 1 × 5 mm2 pair of electrodes screen printed carbon electrode (SPCE). The instrument is a converted local conductometer. From the results of study concluded that the optimum performance of the biosensor was obtained from the 105 μg OPH, at pH 8.5 with a response time of 45 seconds. In that condition the sensitivity of biosensor is 28.04 μS/ppm and 0.18 ppm detection limit and the maximum concentration of pesticide which can be measured is 1 ppm. Biosensors have been applied to measure pesticide residues in some vegetable samples.
文摘Phosphosites in the human proteome represent an excellent source of potential biomarkers of pesticide toxicity. In fact, experimental animal models as well as in vitro studies have revealed phosphorylation disruption associated to metabolic regulation, hormone signaling, neuronal function and differentiation, cell survival and death. Due to their estrogen-mimicking ability, pesticides are considered as prime etiological suspects of increasing tumor incidence. Evidences of alterations in the signal transduction pathways involved in the tumor progression stage of pesticides were also provided. Despite progress in understanding the effect of pesticides on the human phosphorproteome and their health outcomes, it remains a complex issue to be studied. By now, the potential impact of pesticides in epigenetic phosphorylation pathways remains poorly explored. In addition, studies involving pesticides mixtures effects are needed. This review updates and provides a comprehensive discussion on the molecular and biochemical events underlying protein phosphorylation pathway disruption caused by pesticides most frequently detected in human tissues and fluids, such as organochlorine pesticides and organophosphates. The link between epidemiological studies and experimental approaches is also considered. Future challenges, such as micro-array phosphoproteome studies to complement gene expression arrays to understand the mechanisms involved in pesticide toxicology are briefly discussed.
