市场上橄榄油掺假现象屡禁不止,传统鉴定方法存在局限性。本研究利用元素分析仪-稳定同位素比质谱仪(elemental analyzer-isotope ratio mass spectrometer,EA-IRMS)对市场上常见的7种植物油进行氢、碳稳定同位素比值检验,并对测量结果...市场上橄榄油掺假现象屡禁不止,传统鉴定方法存在局限性。本研究利用元素分析仪-稳定同位素比质谱仪(elemental analyzer-isotope ratio mass spectrometer,EA-IRMS)对市场上常见的7种植物油进行氢、碳稳定同位素比值检验,并对测量结果进行显著性差异分析,同时分析橄榄油中氢、碳稳定同位素比值的相关性。结果表明:橄榄油中δD范围为-146.78‰~-125.30‰,δ^(13)C范围为-29.72‰~-28.59‰,与其他品类植物油中氢稳定同位素比值差异显著(P<0.05),与除葵花籽油、野山茶油外的植物油中碳稳定同位素比值差异显著(P<0.05);且橄榄油中氢、碳稳定同位素比值具有较强的相关性(Pearson’s r=0.904)。计算模拟豆油、玉米油对橄榄油掺假的情况,结果表明,氢、碳稳定同位素比结合分析最低能检测出玉米油掺假10%、豆油掺假30%以上的情况。该研究可为橄榄油的掺假鉴定提供方法参考。展开更多
Using quadrupole mass spectrometer,calibration gas PFTBA was turned on in constant flow to get the signal intensity,and off to get the noise value.Different scan time and dwell time was used separately for full scan m...Using quadrupole mass spectrometer,calibration gas PFTBA was turned on in constant flow to get the signal intensity,and off to get the noise value.Different scan time and dwell time was used separately for full scan mode and SIM to find out the effect of scan rate on signal intensity and noise.展开更多
To find out the effect of scan rate on sensitivity in quadrupole mass spectrometer,DDV and 11 common hypnotic drugs were chosen for GC-MS analysis.Different scan time and dwell time was used separately for full scan m...To find out the effect of scan rate on sensitivity in quadrupole mass spectrometer,DDV and 11 common hypnotic drugs were chosen for GC-MS analysis.Different scan time and dwell time was used separately for full scan mode and SIM.Then charasteristic ions were extracted to calculate signal to noise values.展开更多
文摘市场上橄榄油掺假现象屡禁不止,传统鉴定方法存在局限性。本研究利用元素分析仪-稳定同位素比质谱仪(elemental analyzer-isotope ratio mass spectrometer,EA-IRMS)对市场上常见的7种植物油进行氢、碳稳定同位素比值检验,并对测量结果进行显著性差异分析,同时分析橄榄油中氢、碳稳定同位素比值的相关性。结果表明:橄榄油中δD范围为-146.78‰~-125.30‰,δ^(13)C范围为-29.72‰~-28.59‰,与其他品类植物油中氢稳定同位素比值差异显著(P<0.05),与除葵花籽油、野山茶油外的植物油中碳稳定同位素比值差异显著(P<0.05);且橄榄油中氢、碳稳定同位素比值具有较强的相关性(Pearson’s r=0.904)。计算模拟豆油、玉米油对橄榄油掺假的情况,结果表明,氢、碳稳定同位素比结合分析最低能检测出玉米油掺假10%、豆油掺假30%以上的情况。该研究可为橄榄油的掺假鉴定提供方法参考。
文摘Using quadrupole mass spectrometer,calibration gas PFTBA was turned on in constant flow to get the signal intensity,and off to get the noise value.Different scan time and dwell time was used separately for full scan mode and SIM to find out the effect of scan rate on signal intensity and noise.
文摘To find out the effect of scan rate on sensitivity in quadrupole mass spectrometer,DDV and 11 common hypnotic drugs were chosen for GC-MS analysis.Different scan time and dwell time was used separately for full scan mode and SIM.Then charasteristic ions were extracted to calculate signal to noise values.
