样品经正己烷第一次萃取后,氮吹至干,再由乙腈-水第二次萃取,乙腈层经改进的QuEChERS方法净化,以0.1%(V/V)甲酸水溶液-乙腈为流动相梯度洗脱,C18色谱柱分离,HPLC-MS/MS多反应监测(MRM)模式测定,基质匹配外标法定量。结果表明,在9种基质...样品经正己烷第一次萃取后,氮吹至干,再由乙腈-水第二次萃取,乙腈层经改进的QuEChERS方法净化,以0.1%(V/V)甲酸水溶液-乙腈为流动相梯度洗脱,C18色谱柱分离,HPLC-MS/MS多反应监测(MRM)模式测定,基质匹配外标法定量。结果表明,在9种基质(葡萄、梨、甘蔗、黄瓜、芹菜、土豆、大豆、玉米、大米)中,噁唑酰草胺在1.0~50.0ng/mL范围内的线性关系均较好(r>0.999),定量限在0.5μg/kg~1.0μg/kg;在1.0、5.0、10.0μg/kg3个添加水平下,平均回收率为63.9%~113.7%,相对标准偏差(relative standard deviation,RSD)为1.0%~22.2%(n=6)。该方法快速、灵敏、简便、准确,可用于多种植源性食品中噁唑酰草胺农药残留的定性和定量检测。展开更多
The qualitative characterization and quantitative analysis of five bioactive flavonoids in Salix bordensis Turcz. were achieved via reversed-phase high-performance liquid chromatography coupled with diode array detect...The qualitative characterization and quantitative analysis of five bioactive flavonoids in Salix bordensis Turcz. were achieved via reversed-phase high-performance liquid chromatography coupled with diode array detection and tandem mass spectrometry, by using an Agilent ZORBAX SB-C18 HPLC column with a gradient elution of 0.3% (v/v) formic acid in water and methanol as the mobile phase. The compounds in the mixture were clearly identified by comparing their HPLC-DAD ultraviolet spectra, retention times, and MS data with those of corresponding reference compounds. All calibration curves showed good linearity (r2 > 0.9998) within the test ranges. The LOD, LOQ, specificity, precision, and accuracy for the method were validated. The results demonstrated that this analytical approach is ideal for the determination of bioactive compounds, such as flavonoids, and that it constructed a basis for the comprehensive evaluation of the quality of Salix bordensis Turcz.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
文摘样品经正己烷第一次萃取后,氮吹至干,再由乙腈-水第二次萃取,乙腈层经改进的QuEChERS方法净化,以0.1%(V/V)甲酸水溶液-乙腈为流动相梯度洗脱,C18色谱柱分离,HPLC-MS/MS多反应监测(MRM)模式测定,基质匹配外标法定量。结果表明,在9种基质(葡萄、梨、甘蔗、黄瓜、芹菜、土豆、大豆、玉米、大米)中,噁唑酰草胺在1.0~50.0ng/mL范围内的线性关系均较好(r>0.999),定量限在0.5μg/kg~1.0μg/kg;在1.0、5.0、10.0μg/kg3个添加水平下,平均回收率为63.9%~113.7%,相对标准偏差(relative standard deviation,RSD)为1.0%~22.2%(n=6)。该方法快速、灵敏、简便、准确,可用于多种植源性食品中噁唑酰草胺农药残留的定性和定量检测。
文摘The qualitative characterization and quantitative analysis of five bioactive flavonoids in Salix bordensis Turcz. were achieved via reversed-phase high-performance liquid chromatography coupled with diode array detection and tandem mass spectrometry, by using an Agilent ZORBAX SB-C18 HPLC column with a gradient elution of 0.3% (v/v) formic acid in water and methanol as the mobile phase. The compounds in the mixture were clearly identified by comparing their HPLC-DAD ultraviolet spectra, retention times, and MS data with those of corresponding reference compounds. All calibration curves showed good linearity (r2 > 0.9998) within the test ranges. The LOD, LOQ, specificity, precision, and accuracy for the method were validated. The results demonstrated that this analytical approach is ideal for the determination of bioactive compounds, such as flavonoids, and that it constructed a basis for the comprehensive evaluation of the quality of Salix bordensis Turcz.