目的建立气相色谱高分辨飞行时间质谱法(gas chromatography time-of-flight mass spectrometry,GC-TOF/MS)快速筛查水果中283种农药残留量的分析方法。方法利用气相色谱高分辨飞行时间质谱结合MassHunter、PCDL软件建立283种农药的EI...目的建立气相色谱高分辨飞行时间质谱法(gas chromatography time-of-flight mass spectrometry,GC-TOF/MS)快速筛查水果中283种农药残留量的分析方法。方法利用气相色谱高分辨飞行时间质谱结合MassHunter、PCDL软件建立283种农药的EI精确质量谱库,试样经QuEChERS方法进行萃取净化后,采用EI全扫描监测,通过PCDL谱库全离子筛查模式检索,以保留时间、特征离子精确质量数、分子离子同位素信息等作为定性依据。由谱库选择质量数较大、丰度比较高的精确质量离子为定量离子,进行定量测定。结果在空白苹果、葡萄、橙3种水果中添加10、20、40μg/kg 3个浓度水平下,方法的平均回收率65.9%~129.1%,相对标准偏差(relative standard deviation,RSD)2.8%~11.6%,方法的最低检出浓度可达0.5~10μg/kg。结论该方法简便、快速、灵敏、精密度好,是水果中常见农药残留有效快速筛查技术。展开更多
该研究探索并构建一种基于历史数据分析的安全预警方法,对生鲜乳中兽药残留情况进行识别、控制与评价,以便在风险发生之前做出准确判断。首先利用高效液相色谱-高分辨飞行时间串联质谱(High Performance Liquid Chromatography-high Res...该研究探索并构建一种基于历史数据分析的安全预警方法,对生鲜乳中兽药残留情况进行识别、控制与评价,以便在风险发生之前做出准确判断。首先利用高效液相色谱-高分辨飞行时间串联质谱(High Performance Liquid Chromatography-high Resolution Time-of-flight Tandem Mass Spectrometry,HPLC-TOF-MS/MS)方法对上海市各牧场的生鲜乳进行兽药残留筛查,然后以生鲜乳中泼尼松(Prednisone,Pre)残留检出数为例,利用休哈特控制图(Shewhart control charts)构建风险预警体系。结果表明:在300个生鲜乳样品中共筛查出42种兽药残留,涉及类固醇类(12种)、糖皮质类(6种)和镇静剂(5种)等12大类;在筛查的6个星期中,泼尼松检出数(Number of Prednisone Detected,Pn)控制图呈现稳定的状态;当假设第7周泼尼松检出数为6时,Pn控制图呈现稳态,未触发预警;当假设第7周泼尼松检出数为10时,Pn控制图出现异常,稳态遭到破坏,此时该批样品触发风险预警。综上,利用HPLC-TOF-MS/MS能对生鲜乳样品进行高通量的兽药残留筛查,再利用休哈特控制图结合历史数据可以对生鲜乳样品的兽药残留进行有效的风险监测和预警。展开更多
目的建立分散液液微萃取(dispersive liquid-liquid microextraction,DLLME)结合气相色谱-四极杆/飞行时间质谱法(gas chromatography high resolution quadrupole time of flight mass spectrometry,GC-Q-TOF/MS)同时测定饮料中21种邻...目的建立分散液液微萃取(dispersive liquid-liquid microextraction,DLLME)结合气相色谱-四极杆/飞行时间质谱法(gas chromatography high resolution quadrupole time of flight mass spectrometry,GC-Q-TOF/MS)同时测定饮料中21种邻苯二甲酸酯(phthalic acid esters,PAEs)的分析方法。方法样品经正丙醇分散,四氯化碳提取,氮气吹干,正己烷复溶。在该优化的色谱及质谱条件下,采用电子轰击离子源,全扫描方式采集数据,根据碎片离子的精确质量数定性定量。结果21种邻苯二甲酸酯在5.0~1000.0μg/L范围内呈良好线性关系,相关系数r均大于0.9985,平均回收率为70.1%~109.9%,检出限为1.0~5.0μg/L,定量限为3.0~16.0μg/L,相对标准偏差为3.02%~6.68%。结论该方法具有操作简便、高效快速、回收率高、灵敏度高等优点,可用于分析测定饮料中的21种邻苯二甲酸酯。展开更多
Objective: To investigate the chemical transformation of volatile compounds in sulfur-fumigatedRadix Angelicae Sinensis. Methods: A comprehensive two-dimensional gas chromatography (GC x GC) andhigh-resolution tim...Objective: To investigate the chemical transformation of volatile compounds in sulfur-fumigatedRadix Angelicae Sinensis. Methods: A comprehensive two-dimensional gas chromatography (GC x GC) andhigh-resolution time-of-flight mass spectrometry (HR-TOF/MS) with colorized fuzzy difference (CFD) method wasused to investigate the effect of sulfur-fumigation on the volatile components from Radix Angelicae Sinensis.Results: Twenty-five compounds that were found in sun-dried samples disappeared in sulfur-fumigated samples,Seventeen volatile components including two sulfur-containing compounds were newly generated for the firsttime in volatile oils of sulfur-fumigated Radix Angelicae Sinensis. Conclusion: The strategy can be successfullyapplied to rapidly and holisticaily discriminate sun-dried and sulfur-fumigated Radix Angelicae Sinensis.GC x GC-HR-TOF/MS based CFD is a powerful and feasible approach for the global quality evaluation of RadixAngelicae Sinensis as well as other herbal medicines,展开更多
文摘目的建立气相色谱高分辨飞行时间质谱法(gas chromatography time-of-flight mass spectrometry,GC-TOF/MS)快速筛查水果中283种农药残留量的分析方法。方法利用气相色谱高分辨飞行时间质谱结合MassHunter、PCDL软件建立283种农药的EI精确质量谱库,试样经QuEChERS方法进行萃取净化后,采用EI全扫描监测,通过PCDL谱库全离子筛查模式检索,以保留时间、特征离子精确质量数、分子离子同位素信息等作为定性依据。由谱库选择质量数较大、丰度比较高的精确质量离子为定量离子,进行定量测定。结果在空白苹果、葡萄、橙3种水果中添加10、20、40μg/kg 3个浓度水平下,方法的平均回收率65.9%~129.1%,相对标准偏差(relative standard deviation,RSD)2.8%~11.6%,方法的最低检出浓度可达0.5~10μg/kg。结论该方法简便、快速、灵敏、精密度好,是水果中常见农药残留有效快速筛查技术。
文摘该研究探索并构建一种基于历史数据分析的安全预警方法,对生鲜乳中兽药残留情况进行识别、控制与评价,以便在风险发生之前做出准确判断。首先利用高效液相色谱-高分辨飞行时间串联质谱(High Performance Liquid Chromatography-high Resolution Time-of-flight Tandem Mass Spectrometry,HPLC-TOF-MS/MS)方法对上海市各牧场的生鲜乳进行兽药残留筛查,然后以生鲜乳中泼尼松(Prednisone,Pre)残留检出数为例,利用休哈特控制图(Shewhart control charts)构建风险预警体系。结果表明:在300个生鲜乳样品中共筛查出42种兽药残留,涉及类固醇类(12种)、糖皮质类(6种)和镇静剂(5种)等12大类;在筛查的6个星期中,泼尼松检出数(Number of Prednisone Detected,Pn)控制图呈现稳定的状态;当假设第7周泼尼松检出数为6时,Pn控制图呈现稳态,未触发预警;当假设第7周泼尼松检出数为10时,Pn控制图出现异常,稳态遭到破坏,此时该批样品触发风险预警。综上,利用HPLC-TOF-MS/MS能对生鲜乳样品进行高通量的兽药残留筛查,再利用休哈特控制图结合历史数据可以对生鲜乳样品的兽药残留进行有效的风险监测和预警。
文摘目的建立分散液液微萃取(dispersive liquid-liquid microextraction,DLLME)结合气相色谱-四极杆/飞行时间质谱法(gas chromatography high resolution quadrupole time of flight mass spectrometry,GC-Q-TOF/MS)同时测定饮料中21种邻苯二甲酸酯(phthalic acid esters,PAEs)的分析方法。方法样品经正丙醇分散,四氯化碳提取,氮气吹干,正己烷复溶。在该优化的色谱及质谱条件下,采用电子轰击离子源,全扫描方式采集数据,根据碎片离子的精确质量数定性定量。结果21种邻苯二甲酸酯在5.0~1000.0μg/L范围内呈良好线性关系,相关系数r均大于0.9985,平均回收率为70.1%~109.9%,检出限为1.0~5.0μg/L,定量限为3.0~16.0μg/L,相对标准偏差为3.02%~6.68%。结论该方法具有操作简便、高效快速、回收率高、灵敏度高等优点,可用于分析测定饮料中的21种邻苯二甲酸酯。
基金Supported by the National Natural Science Foundation of China(No.81173546 and No.30940093)+10 种基金
the Natural Science Foundation of Jiangsu Province,China(No.BK2009495)
the International Science and Technology Cooperation Project of Jiangsu Province,China(No.BZ2011053)
the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD,No.2011ZYX2-001)
the Postgraduate Research Innovation Project of Jiangsu Higher Education Institutions(No.KYLX_0975)
the Chinese Medicine Research Program of Zhejiang Province,China(No.2014ZQ008)
the Science Foundation of Zhejiang Chinese Medical University(No.2013ZZ12)
文摘Objective: To investigate the chemical transformation of volatile compounds in sulfur-fumigatedRadix Angelicae Sinensis. Methods: A comprehensive two-dimensional gas chromatography (GC x GC) andhigh-resolution time-of-flight mass spectrometry (HR-TOF/MS) with colorized fuzzy difference (CFD) method wasused to investigate the effect of sulfur-fumigation on the volatile components from Radix Angelicae Sinensis.Results: Twenty-five compounds that were found in sun-dried samples disappeared in sulfur-fumigated samples,Seventeen volatile components including two sulfur-containing compounds were newly generated for the firsttime in volatile oils of sulfur-fumigated Radix Angelicae Sinensis. Conclusion: The strategy can be successfullyapplied to rapidly and holisticaily discriminate sun-dried and sulfur-fumigated Radix Angelicae Sinensis.GC x GC-HR-TOF/MS based CFD is a powerful and feasible approach for the global quality evaluation of RadixAngelicae Sinensis as well as other herbal medicines,