目的基于线性离子阱质谱的多重反应监测-信息依赖采集-增强子离子扫描(multiple reaction monitoring-information dependent acquisition-enhanced product ion scan,MRM-IDA-EPI)二级谱图筛查方法,建立超高效液相色谱-串联质谱法(ultr...目的基于线性离子阱质谱的多重反应监测-信息依赖采集-增强子离子扫描(multiple reaction monitoring-information dependent acquisition-enhanced product ion scan,MRM-IDA-EPI)二级谱图筛查方法,建立超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)定量检测和定性筛查野生菌中15种蘑菇毒素。方法野生菌样本通过甲酸-甲醇-水-乙腈(1:40:40:19,V:V:V:V)混合溶液超声提取,QuEChERS试剂提取净化,采用UPLC-MS/MS和MRM-IDA-EPI方法对15种蘑菇毒素进行定量分析和定性筛查。结果通过野生菌样本前处理方法和色谱条件优化,对15种蘑菇毒素进行0.04、0.10和0.40 mg/kg三水平加标回收实验,方法准确度为76.6%~109.2%,精密度为0.3%~7.6%;15种蘑菇毒素的线性范围为10~1000μg/L,线性相关系数(r)在0.9980~0.9994之间;其中α-鹅膏毒肽、β-鹅膏毒肽、γ-鹅膏毒肽、光盖伞素和鹅膏蕈氨酸的方法检出限(limits of detection,LODs)和定量限(limits of quantification,LOQs)分别为10μg/kg和30μg/kg,二羟鬼笔毒肽、羧基二羟鬼笔毒肽、羧基三羟鬼笔毒肽、毒蝇碱、蝇蕈醇、甲基裸盖菇素、鹿花菌素、脱磷酸裸盖菇素、奥来毒素和鬼伞菌素的LODs和LOQs分别为20μg/kg和60μg/kg,采用QuEChERS前处理方法对野生菌样本进行处理,样本基质效应系数K值在0.91~1.08之间。结论所建立的野生菌样本前处理方法对15种蘑菇毒素的定量测定无基质干扰,15种蘑菇毒素的UPLC-MS/MS和MRM-IDA-EPI分析方法结果准确、重现性好、灵敏度高,该方法适用于有毒野生菌引起的食源性中毒定量分析和定性筛查。展开更多
在解析特殊挥发性物质的质谱裂解行为的基础上,建立气相色谱-质谱联用单离子监测(gas chromatography-mass spectrometry with selected ion monitoring,GC-MS SIM)稳定同位素内标法,对不同品种葡萄果实中的58种挥发性物质进行精准的定...在解析特殊挥发性物质的质谱裂解行为的基础上,建立气相色谱-质谱联用单离子监测(gas chromatography-mass spectrometry with selected ion monitoring,GC-MS SIM)稳定同位素内标法,对不同品种葡萄果实中的58种挥发性物质进行精准的定性与定量分析,并探讨不同品种中挥发性物质的含量差异。葡萄果实样品破碎均质后,采用固相微萃取的方法进行高效富集萃取,再进行GC-MS SIM分析。结果表明,在特定的质量浓度范围内该方法线性关系良好,其线性相关系数在0.995 0(除异丙醇为0.967 1)以上;绝大多数目标物的检出限低于1.56μg/kg;除个别挥发性物质的加标回收率较低,不同加标水平目标物样品回收率在60.64%~129.63%范围内,其回收率结果的相对标准偏差均低于19.56%。该方法具有灵敏度高、准确可靠的优点,适用于葡萄等水果蔬菜中挥发性物质的准确定性与定量研究。此外,本实验通过对12个不同品种的葡萄果实样品中挥发性物质的差异分析,探明葡萄果实中的关键性挥发性物质,并挖掘出不同品种葡萄的特色挥发性物质。展开更多
In this work, we developed a highly sensitive method to detect melamine based on reversed phase liquid chromatography mass spectrometry. A mass spectrometry compatible ion pair, heptafluorobu-tyric acid(HFBA), was use...In this work, we developed a highly sensitive method to detect melamine based on reversed phase liquid chromatography mass spectrometry. A mass spectrometry compatible ion pair, heptafluorobu-tyric acid(HFBA), was used to separate melamine by reversed phase liquid chromatography prior to electrospray mass spectrometry. The incorporation of isotope internal standard and multiple reaction monitoring improved the accuracy and linearity of quantification. Based on this strategy, the method limit of quantification was 0.1 ng/g. The limits of quantification were 8 ng/g for liquid milk and 15 ng/g for dry milk powder. This method provided a reproducible and stable approach to sensitive detection and quantification of melamine.展开更多
A new method was developed for the analysis of the volatile and semi-volatile acidic components in tobacco by gas chromatography-mass spectrometry selected ion monitoring(GC-MS,SIM)method.The acidic components in toba...A new method was developed for the analysis of the volatile and semi-volatile acidic components in tobacco by gas chromatography-mass spectrometry selected ion monitoring(GC-MS,SIM)method.The acidic components in tobacco samples were extracted by methylene chloride using simultaneous distillation and extraction equipment,and they were analyzed by HP-INNOWAX column(30m×250μm×0.25μm).Thirteen acidic components were quantitatively determined by internal standard curve method.The experiment results showed that the added standard recoveries of the acidic components were in the range from 80.6% to 98.8%,the relative standard deviations(RSD)were less than 2.0% and the correlation coefficients were more than 0.99.The method is simple,rapid and accurate for the determination of the volatile and semi-volatile acidic components in tobacco.展开更多
文摘目的基于线性离子阱质谱的多重反应监测-信息依赖采集-增强子离子扫描(multiple reaction monitoring-information dependent acquisition-enhanced product ion scan,MRM-IDA-EPI)二级谱图筛查方法,建立超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)定量检测和定性筛查野生菌中15种蘑菇毒素。方法野生菌样本通过甲酸-甲醇-水-乙腈(1:40:40:19,V:V:V:V)混合溶液超声提取,QuEChERS试剂提取净化,采用UPLC-MS/MS和MRM-IDA-EPI方法对15种蘑菇毒素进行定量分析和定性筛查。结果通过野生菌样本前处理方法和色谱条件优化,对15种蘑菇毒素进行0.04、0.10和0.40 mg/kg三水平加标回收实验,方法准确度为76.6%~109.2%,精密度为0.3%~7.6%;15种蘑菇毒素的线性范围为10~1000μg/L,线性相关系数(r)在0.9980~0.9994之间;其中α-鹅膏毒肽、β-鹅膏毒肽、γ-鹅膏毒肽、光盖伞素和鹅膏蕈氨酸的方法检出限(limits of detection,LODs)和定量限(limits of quantification,LOQs)分别为10μg/kg和30μg/kg,二羟鬼笔毒肽、羧基二羟鬼笔毒肽、羧基三羟鬼笔毒肽、毒蝇碱、蝇蕈醇、甲基裸盖菇素、鹿花菌素、脱磷酸裸盖菇素、奥来毒素和鬼伞菌素的LODs和LOQs分别为20μg/kg和60μg/kg,采用QuEChERS前处理方法对野生菌样本进行处理,样本基质效应系数K值在0.91~1.08之间。结论所建立的野生菌样本前处理方法对15种蘑菇毒素的定量测定无基质干扰,15种蘑菇毒素的UPLC-MS/MS和MRM-IDA-EPI分析方法结果准确、重现性好、灵敏度高,该方法适用于有毒野生菌引起的食源性中毒定量分析和定性筛查。
基金Supported by the National Natural Science Foundation of China (Grant No. 30425021)National High Technology Research and Development Program of China (Grant No. 2007AA02Z334)
文摘In this work, we developed a highly sensitive method to detect melamine based on reversed phase liquid chromatography mass spectrometry. A mass spectrometry compatible ion pair, heptafluorobu-tyric acid(HFBA), was used to separate melamine by reversed phase liquid chromatography prior to electrospray mass spectrometry. The incorporation of isotope internal standard and multiple reaction monitoring improved the accuracy and linearity of quantification. Based on this strategy, the method limit of quantification was 0.1 ng/g. The limits of quantification were 8 ng/g for liquid milk and 15 ng/g for dry milk powder. This method provided a reproducible and stable approach to sensitive detection and quantification of melamine.
文摘A new method was developed for the analysis of the volatile and semi-volatile acidic components in tobacco by gas chromatography-mass spectrometry selected ion monitoring(GC-MS,SIM)method.The acidic components in tobacco samples were extracted by methylene chloride using simultaneous distillation and extraction equipment,and they were analyzed by HP-INNOWAX column(30m×250μm×0.25μm).Thirteen acidic components were quantitatively determined by internal standard curve method.The experiment results showed that the added standard recoveries of the acidic components were in the range from 80.6% to 98.8%,the relative standard deviations(RSD)were less than 2.0% and the correlation coefficients were more than 0.99.The method is simple,rapid and accurate for the determination of the volatile and semi-volatile acidic components in tobacco.
