Urinary 8-hydroxy-2 -deoxyguanosine(8-OHdG) is an excellent marker of oxidative DNA damage.In this study,employing guanosine as dummy template a novel molecularly imprinted(MIP) monolithic capillary column had been sy...Urinary 8-hydroxy-2 -deoxyguanosine(8-OHdG) is an excellent marker of oxidative DNA damage.In this study,employing guanosine as dummy template a novel molecularly imprinted(MIP) monolithic capillary column had been synthesized,and that was used as medium of in-tube solid phase microextraction(SPME).Coupled with capillary electrophoresis-electrochemical detection(CE-ECD),the system of extraction and detection of 8-OHdG in urinary sample had been developed.Because of its greater phase ratio combined with conv...展开更多
基于乳品中2-甲基-2-丙烯酸甲酯(MMA)的固相微萃取-气相色谱-质谱联用分析方法,优化了复原乳中MMA的固相微萃取条件,建立了乳品中MMA内标(4-甲基-2-戊酮)和外标定量方法。最佳的萃取条件为:萃取头纤维类型DVB/CAR/PDMS,100 m L顶...基于乳品中2-甲基-2-丙烯酸甲酯(MMA)的固相微萃取-气相色谱-质谱联用分析方法,优化了复原乳中MMA的固相微萃取条件,建立了乳品中MMA内标(4-甲基-2-戊酮)和外标定量方法。最佳的萃取条件为:萃取头纤维类型DVB/CAR/PDMS,100 m L顶空瓶中样品的体积为50 m L,平衡和萃取温度为80℃(30 min)。方法评价结果表明:该方法在10~200μg/L内线性良好,平均回收率为87.5%~109.3%;相对误差为3.1%~5.3%。该方法可用于乳品中MMA的定量分析。展开更多
基金the support of the National Natural Science Foundation of China(No.20575051).
文摘Urinary 8-hydroxy-2 -deoxyguanosine(8-OHdG) is an excellent marker of oxidative DNA damage.In this study,employing guanosine as dummy template a novel molecularly imprinted(MIP) monolithic capillary column had been synthesized,and that was used as medium of in-tube solid phase microextraction(SPME).Coupled with capillary electrophoresis-electrochemical detection(CE-ECD),the system of extraction and detection of 8-OHdG in urinary sample had been developed.Because of its greater phase ratio combined with conv...
文摘基于乳品中2-甲基-2-丙烯酸甲酯(MMA)的固相微萃取-气相色谱-质谱联用分析方法,优化了复原乳中MMA的固相微萃取条件,建立了乳品中MMA内标(4-甲基-2-戊酮)和外标定量方法。最佳的萃取条件为:萃取头纤维类型DVB/CAR/PDMS,100 m L顶空瓶中样品的体积为50 m L,平衡和萃取温度为80℃(30 min)。方法评价结果表明:该方法在10~200μg/L内线性良好,平均回收率为87.5%~109.3%;相对误差为3.1%~5.3%。该方法可用于乳品中MMA的定量分析。