Five thyreostats(TSs),namely tapazole,thiouracil,methylthiouracil,propylthiouracil,and phenylthiouracil,were determined in bovine urine using ultra-high performance liquid chromatography-tandem mass spectrometry(UHPLC...Five thyreostats(TSs),namely tapazole,thiouracil,methylthiouracil,propylthiouracil,and phenylthiouracil,were determined in bovine urine using ultra-high performance liquid chromatography-tandem mass spectrometry(UHPLC-MS/MS)in positive electrospray ionization mode.Extraction and clean-up were achieved using a ChemElut cartridge with tert-butyl methyl ether,without a derivatization step.Separation was achieved on an Acquity UPLC SS T3 column.The mobile phase was acetonitrile and water containing 0.2%(v/v)formic acid.The mass spectrometer was operated in multiple reaction monitoring mode.Urine samples were spiked with TS solution at levels corresponding to 5,10,15,and 20μg/L.The accuracy(internal standard corrected)ranged from 92%to 107%,with a repeatability precision(relative standard deviation,RSD)less than 15%for all five analytes.The RSDs within-laboratory reproducibility was less than 26%.The decision limits(CCα)and detection capabilities(CCβ)were obtained from a calibration curve and were in the ranges of 3.1-6.1μg/L and 4.0-7.4μg/L,respectively.The CCαand CCβvalues were below the recommended concentration,which was set at 10μg/L.The results show that the described method is suitable for the direct detection of TSs in bovine urine.This method can also be used to determine TSs in porcine urine.展开更多
建立了超高效液相色谱-线性离子阱/静电场轨道阱组合式高分辨质谱(UHPLC-LTQ Orbitrap MS)联用技术整合多种数据采集、挖掘策略快速分析无患子果皮中苷类化合物;总结了两类无患子皂苷标准品的质谱裂解规律及特征碎片离子,用于无患子果...建立了超高效液相色谱-线性离子阱/静电场轨道阱组合式高分辨质谱(UHPLC-LTQ Orbitrap MS)联用技术整合多种数据采集、挖掘策略快速分析无患子果皮中苷类化合物;总结了两类无患子皂苷标准品的质谱裂解规律及特征碎片离子,用于无患子果皮中苷类成分的快速筛查和鉴别;探索了母离子列表(parent ion list,PIL)-MS2、PIL-MS3和高能碰撞(high energy collision dissociation,HCD)技术,用于无患子果皮中母核结构相近化合物的精细区分和鉴别;最后通过智能化的In silico策略(Mass Frontier软件中的FISH和MS Tree Match技术)对无患子果皮中新的苷类成分进行高通量筛查,并用HCD碎裂模式验证其预测的可靠性。结果表明,在无患子果皮中共鉴别出67个苷类化合物,其中38个化合物被快速筛查和鉴别,18个母核结构相近的化合物得以精细区分,11个新成分被推测。该方法能够为无患子质量控制及药效学研究提供参考数据,有助于复杂中药成分的快速定性分析。展开更多
建立了超高效液相色谱-串联质谱(UHPLC-MS/MS)测定人体血清中52种全氟及多氟烷基化合物(PFASs)的方法。200μL血清样本经3 mL 0.6%甲酸-乙酸乙酯和正己烷混合溶液(体积比3∶2)进行3次液液萃取后,采用UHPLC-MS/MS检测分析。52种PFASs在...建立了超高效液相色谱-串联质谱(UHPLC-MS/MS)测定人体血清中52种全氟及多氟烷基化合物(PFASs)的方法。200μL血清样本经3 mL 0.6%甲酸-乙酸乙酯和正己烷混合溶液(体积比3∶2)进行3次液液萃取后,采用UHPLC-MS/MS检测分析。52种PFASs在线性范围内线性良好,相关系数(r2)为0.9955~0.9998,方法检出限(LOD)为0.0009~0.0150μg/L,定量下限(LOQ)为0.0029~0.0500μg/L,加标回收率为75.1%~115%,平均加标回收率为78.9%~107%,相对标准偏差(RSD)为1.6%~15%,基质效应为85.0%~115%。使用该方法对180份人体血清进行检测,共检出48种化合物,其中PFHpA、PFOA、PFNA、PFDA、PFUdA、PFDoA、PFTrDA、PFTeDA、PFHxS、PFHpS、PFOS和6∶2 Cl-PFAES等12个单体化合物的检出率为100%。该方法操作简便,检出限低、精密度好、准确度高且重复性好,符合血清中PFASs检测分析的要求。展开更多
建立了QuEChERS净化结合超高效液相色谱串联四级杆飞行时间质谱(UHPLC-Q-TOF/MS)法同时筛查猪肉中10种抗生素类兽药残留量的分析方法。样品经过Na;EDTA-Mcllvaine缓冲溶液-0.1%甲酸乙腈-NaCl-无水Na_(2)SO_(4)-C_(18)的提取净化。通过In...建立了QuEChERS净化结合超高效液相色谱串联四级杆飞行时间质谱(UHPLC-Q-TOF/MS)法同时筛查猪肉中10种抗生素类兽药残留量的分析方法。样品经过Na;EDTA-Mcllvaine缓冲溶液-0.1%甲酸乙腈-NaCl-无水Na_(2)SO_(4)-C_(18)的提取净化。通过Infinity Lab Poroshell 120 EC-C_(18)色谱柱分离,在正离子多反应监测模式下分析。结果表明,10种兽药相关系数大于0.99,在5.0~100.0μg/kg范围内线性关系良好,在5、10、20μg/kg三个添加水平下平均回收率为72.3%~117.3%,日内相对标准偏差为(Relative Standard Deviation,RSD)0.9%~10.4%,日间RSD为1.1%~13.4%,检测限(Limit of Detection,LOD)为0.25~1.0μg/kg,定量限(Limit of Quantity,LOQ)为0.5~5.0μg/kg。采用本方法对市场购买的50份新鲜生猪肉样品进行检测,1份样品四环素呈阳性,其余样品均未检出。该方法操作简便、快速,具有良好的精密度和定量限,适用于猪肉中10种抗生素类兽药的快速检测。展开更多
文摘Five thyreostats(TSs),namely tapazole,thiouracil,methylthiouracil,propylthiouracil,and phenylthiouracil,were determined in bovine urine using ultra-high performance liquid chromatography-tandem mass spectrometry(UHPLC-MS/MS)in positive electrospray ionization mode.Extraction and clean-up were achieved using a ChemElut cartridge with tert-butyl methyl ether,without a derivatization step.Separation was achieved on an Acquity UPLC SS T3 column.The mobile phase was acetonitrile and water containing 0.2%(v/v)formic acid.The mass spectrometer was operated in multiple reaction monitoring mode.Urine samples were spiked with TS solution at levels corresponding to 5,10,15,and 20μg/L.The accuracy(internal standard corrected)ranged from 92%to 107%,with a repeatability precision(relative standard deviation,RSD)less than 15%for all five analytes.The RSDs within-laboratory reproducibility was less than 26%.The decision limits(CCα)and detection capabilities(CCβ)were obtained from a calibration curve and were in the ranges of 3.1-6.1μg/L and 4.0-7.4μg/L,respectively.The CCαand CCβvalues were below the recommended concentration,which was set at 10μg/L.The results show that the described method is suitable for the direct detection of TSs in bovine urine.This method can also be used to determine TSs in porcine urine.
文摘建立了超高效液相色谱-线性离子阱/静电场轨道阱组合式高分辨质谱(UHPLC-LTQ Orbitrap MS)联用技术整合多种数据采集、挖掘策略快速分析无患子果皮中苷类化合物;总结了两类无患子皂苷标准品的质谱裂解规律及特征碎片离子,用于无患子果皮中苷类成分的快速筛查和鉴别;探索了母离子列表(parent ion list,PIL)-MS2、PIL-MS3和高能碰撞(high energy collision dissociation,HCD)技术,用于无患子果皮中母核结构相近化合物的精细区分和鉴别;最后通过智能化的In silico策略(Mass Frontier软件中的FISH和MS Tree Match技术)对无患子果皮中新的苷类成分进行高通量筛查,并用HCD碎裂模式验证其预测的可靠性。结果表明,在无患子果皮中共鉴别出67个苷类化合物,其中38个化合物被快速筛查和鉴别,18个母核结构相近的化合物得以精细区分,11个新成分被推测。该方法能够为无患子质量控制及药效学研究提供参考数据,有助于复杂中药成分的快速定性分析。
文摘建立了超高效液相色谱-串联质谱(UHPLC-MS/MS)测定人体血清中52种全氟及多氟烷基化合物(PFASs)的方法。200μL血清样本经3 mL 0.6%甲酸-乙酸乙酯和正己烷混合溶液(体积比3∶2)进行3次液液萃取后,采用UHPLC-MS/MS检测分析。52种PFASs在线性范围内线性良好,相关系数(r2)为0.9955~0.9998,方法检出限(LOD)为0.0009~0.0150μg/L,定量下限(LOQ)为0.0029~0.0500μg/L,加标回收率为75.1%~115%,平均加标回收率为78.9%~107%,相对标准偏差(RSD)为1.6%~15%,基质效应为85.0%~115%。使用该方法对180份人体血清进行检测,共检出48种化合物,其中PFHpA、PFOA、PFNA、PFDA、PFUdA、PFDoA、PFTrDA、PFTeDA、PFHxS、PFHpS、PFOS和6∶2 Cl-PFAES等12个单体化合物的检出率为100%。该方法操作简便,检出限低、精密度好、准确度高且重复性好,符合血清中PFASs检测分析的要求。
文摘建立了QuEChERS净化结合超高效液相色谱串联四级杆飞行时间质谱(UHPLC-Q-TOF/MS)法同时筛查猪肉中10种抗生素类兽药残留量的分析方法。样品经过Na;EDTA-Mcllvaine缓冲溶液-0.1%甲酸乙腈-NaCl-无水Na_(2)SO_(4)-C_(18)的提取净化。通过Infinity Lab Poroshell 120 EC-C_(18)色谱柱分离,在正离子多反应监测模式下分析。结果表明,10种兽药相关系数大于0.99,在5.0~100.0μg/kg范围内线性关系良好,在5、10、20μg/kg三个添加水平下平均回收率为72.3%~117.3%,日内相对标准偏差为(Relative Standard Deviation,RSD)0.9%~10.4%,日间RSD为1.1%~13.4%,检测限(Limit of Detection,LOD)为0.25~1.0μg/kg,定量限(Limit of Quantity,LOQ)为0.5~5.0μg/kg。采用本方法对市场购买的50份新鲜生猪肉样品进行检测,1份样品四环素呈阳性,其余样品均未检出。该方法操作简便、快速,具有良好的精密度和定量限,适用于猪肉中10种抗生素类兽药的快速检测。
