[Objectives] To study the chemical components and relative content of Achyranthes bidentata leaves and provide a scientific basis for further development and utilization of A. bidentata leaves.[Methods] The chemical c...[Objectives] To study the chemical components and relative content of Achyranthes bidentata leaves and provide a scientific basis for further development and utilization of A. bidentata leaves.[Methods] The chemical components of A. bidentata leaves were rapidly analyzed using the ultra high performance liquid chromatography-time of flight-high resolution mass spectrometry (UHPLC-TOF-MS).[Results] Thirty eight chemical compounds were identified in samples of A. bidentata leaves collected from Wen County of Henan Province, in which seven chemical compounds had the relative content higher than 5%, linoleic acid reached 25.7% and inokosterone A reached 13.8%.[Conclusions] A. bidentata leaves contain many kinds of chemical compounds. This study is expected to provide a certain basis for further extraction of linoleic acid and inokosterone A.展开更多
An ultrahigh performance liquid chromatography-triple quadrupole tandem mass spectrometry(UPLC-MS/MS)was established to quickly and accurately determine the content of oleuropein in cosmetics.The samples were extracte...An ultrahigh performance liquid chromatography-triple quadrupole tandem mass spectrometry(UPLC-MS/MS)was established to quickly and accurately determine the content of oleuropein in cosmetics.The samples were extracted with methanol-aqueous solution,and the mobile phase with methanol-formic acid solution(0.1 mol/L)=40∶60 was separated by Agilent ZORBAX Eclipse Plus C18(2.1 mm×50 mm×1.8μm-Micron)column temperature 30℃,flow rate 0.3 mL/min.The MS end was detected by electrospray negative mode ionization(ESI-)and multiple reaction monitoring(MRM)mode.The results show a good linear relationship in the range of 0.002~5 mg/L,with a correlation coefficient R2 of 0.999,5.Method recovery range from 84.2%~107.6%and the relative standard deviation RSD is 5.8%.The detection time is 5 min,the detection limit is 0.000,6 mg/L,and the limit of quantification is 0.002 mg/L.This method has the advantages of convenient operation,low quantification limit,high precision and good repeatability,and is suitable for measuring the content of oleuropein in many kinds of cosmetics.展开更多
This paper reported a new analytical method for the simultaneous determination of seven benzotriazole ultraviolet absorbers and seven antibacterial agents in textiles. After ultrasonic extraction for the textile sampl...This paper reported a new analytical method for the simultaneous determination of seven benzotriazole ultraviolet absorbers and seven antibacterial agents in textiles. After ultrasonic extraction for the textile samples in methanol, the solutions were analyzed by ultra-high performance liquid chromotagraphy/orbitrap high resolution mass spectrometry (UPLC/Orbitrap HRMS). It showed that a good chromatographic separation for these target compounds was achieved by a Hypersil GOLD column (100 mm × 2.1 mm × 1.9 μm) with a gradient elution of methanol and 0.1% aqueous formic acid solution (containing 0.5 mmol/L ammonium acetate). Triclosan and 4-chloro-3,5-dimethyl phenol (PCMX) were detected by the orbitrap HRMS in an electrospray ionization (ESI) negative mode while the other twelve target compounds were detected by orbitrap HRMS in ESI positive mode. Full scan experiment was performed over the range from m/z 100 to m/z 500. These target compounds were routinely detected with mass accuracy below 2 × 10-6 (2 ppm) at the optimized conditions. The results showed that the limits of detection (LODs) were in the range from 0.1 to 0.3 μg/kg. The blank samples were spiked at three levels and their average recoveries varied from 80.5% to 96.3% while the relative standard deviation (RSD) changed from 3.2% to 9.9%. The present method was also applied for the determination of those ultraviolet absorbers and antibacterial agents in the commercial textiles.展开更多
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
基于食品基质中松仁过敏原Pin k 2建立了一种超高效液相色谱-串联质谱法。将松仁经过研磨、脱脂、浸提、酶解后经Easy-nLC 1000-QExactive高分辨质谱仪进行分离分析,结合Uniprot蛋白数据库以及ProteinPilotTM软件对质谱图进行数据处理,...基于食品基质中松仁过敏原Pin k 2建立了一种超高效液相色谱-串联质谱法。将松仁经过研磨、脱脂、浸提、酶解后经Easy-nLC 1000-QExactive高分辨质谱仪进行分离分析,结合Uniprot蛋白数据库以及ProteinPilotTM软件对质谱图进行数据处理,经BLAST验证特异性,最终筛选3条松仁特异性肽段。方法学验证结果表明,方法在0.001~50mg/mL范围内线性关系良好,定量限为1mg/kg;在饼干、巧克力和饮料3种空白基质中的平均回收率为88.50%~107.57%,相对标准偏差不高于6.08%,基质效应为89.77%~96.13%。该方法具有灵敏度高、特异性好的优势,可应用于饼干、巧克力、饮料等食品样品中松仁过敏原的检测,为我国食品标签真实性检验及食品中隐性过敏原的检测提供技术支持。展开更多
采用十八烷基三氯硅烷(octadecyltrichlorosilane,OTS)与N-[3-(三甲氧基硅基)丙基]乙二胺(N-[3-(trimethoxysilyl)propyl]ethylenediamine,ATS)改性三聚氰胺海绵(melamine sponge,MeS)制备得到2种新型弹性多孔硅烷化MeS(OTS@MeS和ATS@M...采用十八烷基三氯硅烷(octadecyltrichlorosilane,OTS)与N-[3-(三甲氧基硅基)丙基]乙二胺(N-[3-(trimethoxysilyl)propyl]ethylenediamine,ATS)改性三聚氰胺海绵(melamine sponge,MeS)制备得到2种新型弹性多孔硅烷化MeS(OTS@MeS和ATS@MeS)净化材料,将其用于改良QuEChERS(quick,easy,cheap,effective,rugged and safe)基质净化过程,通过溶液自发浸润和物理挤压过程即可快速、高效分离干扰基质,结合超高效液相色谱-串联质谱技术建立了同时测定猪肉中49种抗生素多残留的分析方法。样品用1.0%乙酸-乙腈溶液提取并用2.0 g Na_(2)SO_(4)和0.5 g NaCl盐析,离心后取1 mL上清液复配使用OTS@MeS与ATS@MeS净化,随后使用Agilent ZORBAX Eclipse Plus C_(18)色谱柱,以甲醇溶液和含有0.1%甲酸、5 mmol/L乙酸铵的甲醇-水溶液(5∶95,V/V)为流动相进行梯度洗脱,采用电喷雾电离源、正离子多反应监测模式进行定性定量分析。结果表明:49种抗生素的相关系数均大于0.999,基质效应为-13.5%~10.9%,检出限在0.1~10μg/kg之间,定量限在0.3~30.3μg/kg之间;利用该方法在低、中、高3个加标水平下进行回收率实验,回收率范围为65.0%~112.7%,日内和日间相对标准偏差分别为0.3%~11.8%和2.4%~18.4%。该方法样品前处理过程简单、快捷、灵敏度高、准确性好,可用于猪肉中49种抗生素多残留的高效快速检测。展开更多
建立了超高效液相色谱串联质谱(UPLC-MS/MS)技术同时测定不同年份的酱香型白酒中12种吡嗪类化合物的分析方法。结果表明,12种吡嗪类化合物在质量浓度50~1000μg/L范围内线性关系良好,相关系数(R2)均>0.99,检出限在0.051~6.00μg/L,...建立了超高效液相色谱串联质谱(UPLC-MS/MS)技术同时测定不同年份的酱香型白酒中12种吡嗪类化合物的分析方法。结果表明,12种吡嗪类化合物在质量浓度50~1000μg/L范围内线性关系良好,相关系数(R2)均>0.99,检出限在0.051~6.00μg/L,定量限在0.18~21.42μg/L,日内精密度试验结果相对标准偏差(RSD)为0.67%~2.72%,在0.1μg/m L、0.2μg/m L、0.5μg/m L 3个质量浓度水平下的加标回收率为80.6%~108.7%。12种吡嗪类化合物随着酱香型白酒贮存年份的增加,其含量均呈现上升态势,在15年酱香型白酒中含量达到最高值。通过多元统计分析找到不同年份酱香型白酒的特征差异性化合物,分别为2,3,5,6-四甲基吡嗪、2,6-二甲基吡嗪和2,3-二甲基吡嗪,这些特征差异性化合物可能为主要差异性指标成分,可以用于区分不同年份的酱香型白酒。该方法前处理简单、分析时间短、稳定性高,为酱香型白酒中吡嗪类化合物的检测提供了相关技术依据。展开更多
基于超高效液相色谱-串联三重四极杆质谱法建立含乳成分的特殊医学用途配方食品中6种季铵盐类消毒剂残留的检测分析方法。使用80%乙腈水溶液作为提取溶液对样品进行提取,采用RRHD Eclipse Plus C_(18)色谱柱进行分离,选择电喷雾离子源,...基于超高效液相色谱-串联三重四极杆质谱法建立含乳成分的特殊医学用途配方食品中6种季铵盐类消毒剂残留的检测分析方法。使用80%乙腈水溶液作为提取溶液对样品进行提取,采用RRHD Eclipse Plus C_(18)色谱柱进行分离,选择电喷雾离子源,在正离子模式下(ESI+)采用多反应监测模式进行检测,用基质匹配工作曲线进行定量。结果表明:6种季铵盐类消毒剂在0.1~5.0 ng/mL质量浓度范围内具有良好的线性关系,线性相关系数>0.9960,检出限为0.5μg/kg,定量限为1μg/kg;固体基质中加标回收率为72.8%~102.3%,相对标准偏差(relative standarddeviation,RSD)为0.25%~3.88%;液体基质中加标回收率为71.8%~100.8%,RSD为0.19%~2.51%。方法简单、高效、快捷、灵敏,能够很好地用于特殊医学用途配方食品中季铵盐类消毒剂的分析测定。展开更多
基金Supported by Key Scientific and Technological Research Project in Higher Education Institutions of Henan Province(17A350002)Project of National Natural Science Foundation of China(81172953)
文摘[Objectives] To study the chemical components and relative content of Achyranthes bidentata leaves and provide a scientific basis for further development and utilization of A. bidentata leaves.[Methods] The chemical components of A. bidentata leaves were rapidly analyzed using the ultra high performance liquid chromatography-time of flight-high resolution mass spectrometry (UHPLC-TOF-MS).[Results] Thirty eight chemical compounds were identified in samples of A. bidentata leaves collected from Wen County of Henan Province, in which seven chemical compounds had the relative content higher than 5%, linoleic acid reached 25.7% and inokosterone A reached 13.8%.[Conclusions] A. bidentata leaves contain many kinds of chemical compounds. This study is expected to provide a certain basis for further extraction of linoleic acid and inokosterone A.
文摘An ultrahigh performance liquid chromatography-triple quadrupole tandem mass spectrometry(UPLC-MS/MS)was established to quickly and accurately determine the content of oleuropein in cosmetics.The samples were extracted with methanol-aqueous solution,and the mobile phase with methanol-formic acid solution(0.1 mol/L)=40∶60 was separated by Agilent ZORBAX Eclipse Plus C18(2.1 mm×50 mm×1.8μm-Micron)column temperature 30℃,flow rate 0.3 mL/min.The MS end was detected by electrospray negative mode ionization(ESI-)and multiple reaction monitoring(MRM)mode.The results show a good linear relationship in the range of 0.002~5 mg/L,with a correlation coefficient R2 of 0.999,5.Method recovery range from 84.2%~107.6%and the relative standard deviation RSD is 5.8%.The detection time is 5 min,the detection limit is 0.000,6 mg/L,and the limit of quantification is 0.002 mg/L.This method has the advantages of convenient operation,low quantification limit,high precision and good repeatability,and is suitable for measuring the content of oleuropein in many kinds of cosmetics.
文摘This paper reported a new analytical method for the simultaneous determination of seven benzotriazole ultraviolet absorbers and seven antibacterial agents in textiles. After ultrasonic extraction for the textile samples in methanol, the solutions were analyzed by ultra-high performance liquid chromotagraphy/orbitrap high resolution mass spectrometry (UPLC/Orbitrap HRMS). It showed that a good chromatographic separation for these target compounds was achieved by a Hypersil GOLD column (100 mm × 2.1 mm × 1.9 μm) with a gradient elution of methanol and 0.1% aqueous formic acid solution (containing 0.5 mmol/L ammonium acetate). Triclosan and 4-chloro-3,5-dimethyl phenol (PCMX) were detected by the orbitrap HRMS in an electrospray ionization (ESI) negative mode while the other twelve target compounds were detected by orbitrap HRMS in ESI positive mode. Full scan experiment was performed over the range from m/z 100 to m/z 500. These target compounds were routinely detected with mass accuracy below 2 × 10-6 (2 ppm) at the optimized conditions. The results showed that the limits of detection (LODs) were in the range from 0.1 to 0.3 μg/kg. The blank samples were spiked at three levels and their average recoveries varied from 80.5% to 96.3% while the relative standard deviation (RSD) changed from 3.2% to 9.9%. The present method was also applied for the determination of those ultraviolet absorbers and antibacterial agents in the commercial textiles.
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.
文摘基于食品基质中松仁过敏原Pin k 2建立了一种超高效液相色谱-串联质谱法。将松仁经过研磨、脱脂、浸提、酶解后经Easy-nLC 1000-QExactive高分辨质谱仪进行分离分析,结合Uniprot蛋白数据库以及ProteinPilotTM软件对质谱图进行数据处理,经BLAST验证特异性,最终筛选3条松仁特异性肽段。方法学验证结果表明,方法在0.001~50mg/mL范围内线性关系良好,定量限为1mg/kg;在饼干、巧克力和饮料3种空白基质中的平均回收率为88.50%~107.57%,相对标准偏差不高于6.08%,基质效应为89.77%~96.13%。该方法具有灵敏度高、特异性好的优势,可应用于饼干、巧克力、饮料等食品样品中松仁过敏原的检测,为我国食品标签真实性检验及食品中隐性过敏原的检测提供技术支持。
文摘采用十八烷基三氯硅烷(octadecyltrichlorosilane,OTS)与N-[3-(三甲氧基硅基)丙基]乙二胺(N-[3-(trimethoxysilyl)propyl]ethylenediamine,ATS)改性三聚氰胺海绵(melamine sponge,MeS)制备得到2种新型弹性多孔硅烷化MeS(OTS@MeS和ATS@MeS)净化材料,将其用于改良QuEChERS(quick,easy,cheap,effective,rugged and safe)基质净化过程,通过溶液自发浸润和物理挤压过程即可快速、高效分离干扰基质,结合超高效液相色谱-串联质谱技术建立了同时测定猪肉中49种抗生素多残留的分析方法。样品用1.0%乙酸-乙腈溶液提取并用2.0 g Na_(2)SO_(4)和0.5 g NaCl盐析,离心后取1 mL上清液复配使用OTS@MeS与ATS@MeS净化,随后使用Agilent ZORBAX Eclipse Plus C_(18)色谱柱,以甲醇溶液和含有0.1%甲酸、5 mmol/L乙酸铵的甲醇-水溶液(5∶95,V/V)为流动相进行梯度洗脱,采用电喷雾电离源、正离子多反应监测模式进行定性定量分析。结果表明:49种抗生素的相关系数均大于0.999,基质效应为-13.5%~10.9%,检出限在0.1~10μg/kg之间,定量限在0.3~30.3μg/kg之间;利用该方法在低、中、高3个加标水平下进行回收率实验,回收率范围为65.0%~112.7%,日内和日间相对标准偏差分别为0.3%~11.8%和2.4%~18.4%。该方法样品前处理过程简单、快捷、灵敏度高、准确性好,可用于猪肉中49种抗生素多残留的高效快速检测。
文摘建立了超高效液相色谱串联质谱(UPLC-MS/MS)技术同时测定不同年份的酱香型白酒中12种吡嗪类化合物的分析方法。结果表明,12种吡嗪类化合物在质量浓度50~1000μg/L范围内线性关系良好,相关系数(R2)均>0.99,检出限在0.051~6.00μg/L,定量限在0.18~21.42μg/L,日内精密度试验结果相对标准偏差(RSD)为0.67%~2.72%,在0.1μg/m L、0.2μg/m L、0.5μg/m L 3个质量浓度水平下的加标回收率为80.6%~108.7%。12种吡嗪类化合物随着酱香型白酒贮存年份的增加,其含量均呈现上升态势,在15年酱香型白酒中含量达到最高值。通过多元统计分析找到不同年份酱香型白酒的特征差异性化合物,分别为2,3,5,6-四甲基吡嗪、2,6-二甲基吡嗪和2,3-二甲基吡嗪,这些特征差异性化合物可能为主要差异性指标成分,可以用于区分不同年份的酱香型白酒。该方法前处理简单、分析时间短、稳定性高,为酱香型白酒中吡嗪类化合物的检测提供了相关技术依据。