目的基于超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)建立乳制品中乳铁蛋白、乳桥蛋白、奶牛A1β-酪蛋白和A2β-酪蛋白、水牛A2β-酪蛋白的检测方法,开展市售乳制品中功...目的基于超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)建立乳制品中乳铁蛋白、乳桥蛋白、奶牛A1β-酪蛋白和A2β-酪蛋白、水牛A2β-酪蛋白的检测方法,开展市售乳制品中功能性蛋白质检测和乳制品真实性鉴评分析。方法乳蛋白经酶解后,应用超高效液相色谱-四极杆-静电场轨道阱高分辨质谱法(ultra performance liquid chromatography-triple quadrupole-Orbitrap high resolution mass spectrometry,UPLC-Q/Orbitrap HRMS)和UPLC-MS/MS筛选获得可用于定性定量分析的特征肽段,基于UPLC-MS/MS建立同时检测LF、LPN、奶牛A1β-CN、奶牛A2β-CN和水牛A2β-CN的方法并应用于乳制品检测。结果5种待测蛋白在相应的浓度范围内线性关系良好(r^(2)>0.99),加标回收率在82.1%~105.5%之间,相对标准偏差均小于5%,78份乳制品的检测结果表明同类样品LF含量差异较大,不同类液体乳中LPN均值差异不大。结论本方法性能良好,适用于乳制品中乳桥蛋白等功能性蛋白的同时检测,也可以实现乳制品中乳蛋白物种来源的鉴别。展开更多
The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs w...The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs was extracted from samples by Soxhlet extraction,concentrated and purified by FMS column chromatograph,carbon column enrichment.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).TEQ concentration was calculated by WHO-TEF multiplying by concentration of seventeen PCDD/Fs congener.Median of PCDD/Fs concentration for fish,livestock,poultry,egg,vegetable oil,milk,vegetable totally 100 samples for ten diverse foods didn’t exceed the limit standards by EU.The level of PCDD/Fs for different food in the certain area was lower or comparable to the data reported by developed country in the world.The total weekly intake and monthly intake for local population or national population was 3.44,14.8 WHO-TEQ/kg BW and 1.5,6.42 pg WHO-TEQ/kg BW respectively,the value was lower than the Tolerable Weekly Intake of 14 pg WHO TEQ/kg BW for PCDDs,PCDFs and dioxin-like PCBs established by EU Scientific Committee for Food.The dietary PCDD/Fs intake for local people was higher than national population.And animal food was the dominant contributor to the total dietary intake,which accounted for more than 70 percent.These levels of consumption of diverse food containing typical levels of PCDD/Fs doesn’t present a risk to the health of the local population.But integrative dietary intake could be evaluated including of PCBs intake for population in the future.展开更多
目的利用超高效液相色谱-四极杆/飞行时间高分辨质谱(ultra performance liquid chromatography tandem quadrupole/time-of-flight high resolution mass spectrometry,UPLC-Q/TOF HRMS),建立同时鉴别和定量测定保健食品及其原料中的...目的利用超高效液相色谱-四极杆/飞行时间高分辨质谱(ultra performance liquid chromatography tandem quadrupole/time-of-flight high resolution mass spectrometry,UPLC-Q/TOF HRMS),建立同时鉴别和定量测定保健食品及其原料中的洛伐他汀及其类似物的分析方法。方法样品用Agilent Eclipse Plus C_(18)(50mm×2.1 mm,1.8μm)色谱柱分离,以甲醇和0.1%甲酸溶液作为流动相进行梯度洗脱,电喷雾正离子模式离子化,全扫描模式检测。结果当称样量为1 g时,酸式洛伐他汀、洛伐他汀、美伐他汀、辛伐他汀、去羟基洛伐他汀和洛伐他汀羟酸钠盐的检出限分别为40、25、25、25、25和50 ng/g;洛伐他汀、美伐他汀、辛伐他汀、去羟基洛伐他汀在25~200μg/L范围、洛伐他汀羟酸钠盐在100~800μg/L范围内线性关系良好(R≥0.99);5种成分在保健食品及原料中均有较好的回收率和稳定性。结论该方法简便、快速、灵敏、准确,适合于保健食品及原料中的洛伐他汀及其类似物的鉴别和定量测定。展开更多
文摘目的基于超高效液相色谱-串联质谱法(ultra performance liquid chromatography-tandem mass spectrometry,UPLC-MS/MS)建立乳制品中乳铁蛋白、乳桥蛋白、奶牛A1β-酪蛋白和A2β-酪蛋白、水牛A2β-酪蛋白的检测方法,开展市售乳制品中功能性蛋白质检测和乳制品真实性鉴评分析。方法乳蛋白经酶解后,应用超高效液相色谱-四极杆-静电场轨道阱高分辨质谱法(ultra performance liquid chromatography-triple quadrupole-Orbitrap high resolution mass spectrometry,UPLC-Q/Orbitrap HRMS)和UPLC-MS/MS筛选获得可用于定性定量分析的特征肽段,基于UPLC-MS/MS建立同时检测LF、LPN、奶牛A1β-CN、奶牛A2β-CN和水牛A2β-CN的方法并应用于乳制品检测。结果5种待测蛋白在相应的浓度范围内线性关系良好(r^(2)>0.99),加标回收率在82.1%~105.5%之间,相对标准偏差均小于5%,78份乳制品的检测结果表明同类样品LF含量差异较大,不同类液体乳中LPN均值差异不大。结论本方法性能良好,适用于乳制品中乳桥蛋白等功能性蛋白的同时检测,也可以实现乳制品中乳蛋白物种来源的鉴别。
文摘The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs was extracted from samples by Soxhlet extraction,concentrated and purified by FMS column chromatograph,carbon column enrichment.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).TEQ concentration was calculated by WHO-TEF multiplying by concentration of seventeen PCDD/Fs congener.Median of PCDD/Fs concentration for fish,livestock,poultry,egg,vegetable oil,milk,vegetable totally 100 samples for ten diverse foods didn’t exceed the limit standards by EU.The level of PCDD/Fs for different food in the certain area was lower or comparable to the data reported by developed country in the world.The total weekly intake and monthly intake for local population or national population was 3.44,14.8 WHO-TEQ/kg BW and 1.5,6.42 pg WHO-TEQ/kg BW respectively,the value was lower than the Tolerable Weekly Intake of 14 pg WHO TEQ/kg BW for PCDDs,PCDFs and dioxin-like PCBs established by EU Scientific Committee for Food.The dietary PCDD/Fs intake for local people was higher than national population.And animal food was the dominant contributor to the total dietary intake,which accounted for more than 70 percent.These levels of consumption of diverse food containing typical levels of PCDD/Fs doesn’t present a risk to the health of the local population.But integrative dietary intake could be evaluated including of PCBs intake for population in the future.
文摘目的利用超高效液相色谱-四极杆/飞行时间高分辨质谱(ultra performance liquid chromatography tandem quadrupole/time-of-flight high resolution mass spectrometry,UPLC-Q/TOF HRMS),建立同时鉴别和定量测定保健食品及其原料中的洛伐他汀及其类似物的分析方法。方法样品用Agilent Eclipse Plus C_(18)(50mm×2.1 mm,1.8μm)色谱柱分离,以甲醇和0.1%甲酸溶液作为流动相进行梯度洗脱,电喷雾正离子模式离子化,全扫描模式检测。结果当称样量为1 g时,酸式洛伐他汀、洛伐他汀、美伐他汀、辛伐他汀、去羟基洛伐他汀和洛伐他汀羟酸钠盐的检出限分别为40、25、25、25、25和50 ng/g;洛伐他汀、美伐他汀、辛伐他汀、去羟基洛伐他汀在25~200μg/L范围、洛伐他汀羟酸钠盐在100~800μg/L范围内线性关系良好(R≥0.99);5种成分在保健食品及原料中均有较好的回收率和稳定性。结论该方法简便、快速、灵敏、准确,适合于保健食品及原料中的洛伐他汀及其类似物的鉴别和定量测定。