目的建立可同时测定尿中11种羟基多环芳烃(hydroxy-polycyclic aromatic hydrocarbons,OH-PAHs)的超高效液相色谱串联质谱分析(ultra-high performance liquid chromatography tandem with mass spectrometry,UPLC-MS/MS)法。方法尿液...目的建立可同时测定尿中11种羟基多环芳烃(hydroxy-polycyclic aromatic hydrocarbons,OH-PAHs)的超高效液相色谱串联质谱分析(ultra-high performance liquid chromatography tandem with mass spectrometry,UPLC-MS/MS)法。方法尿液样品在pH=5.5条件下,在37℃水浴中经β-葡萄糖苷酸酶—芳基硫酸酯酶避光水解16 h,3.0 mL正己烷萃取、涡旋、离心,取上层有机相,重复萃取两次,合并萃取液,氮吹至近干,再复溶于20%乙腈水溶液中。流动相为水和10%异丙醇甲醇溶液,梯度洗脱模式洗脱,CORTECS C18色谱柱分离,ESI-模式测定尿液中11种羟基多环芳烃浓度,内标法定量分析。结果11种羟基多环芳烃线性关系良好,相关系数(r)均大于0.997。方法的检出限为0.01~0.10 ng/mL;日间回收率为79.8%~97.3%,精密度为1.9%~4.7%(n=3);日内回收率为78.6%~92.3%,精密度为3.7%~7.1%(n=3)。结论该方灵敏度高,准确可靠,适用于人群中多种羟基多环芳烃的监测。展开更多
The reaction of a series of hydroxy-substituted polycyclic aromatic hydrocarbons(PAHs)with nitric oxide containing trace O 2 was carried out in CH 2Cl 2 at room temperature. The products identified by IR, NMR and HRMS...The reaction of a series of hydroxy-substituted polycyclic aromatic hydrocarbons(PAHs)with nitric oxide containing trace O 2 was carried out in CH 2Cl 2 at room temperature. The products identified by IR, NMR and HRMS indicate that the mono nitration at para- or ortho-position with respect to hydroxy group on the benzene ring occurred regioselectively. The reactions are assumed to be initiated by single electron transfer and the reaction intermediates may be resonance stabilized phenoxy-like radicals.展开更多
文摘目的建立可同时测定尿中11种羟基多环芳烃(hydroxy-polycyclic aromatic hydrocarbons,OH-PAHs)的超高效液相色谱串联质谱分析(ultra-high performance liquid chromatography tandem with mass spectrometry,UPLC-MS/MS)法。方法尿液样品在pH=5.5条件下,在37℃水浴中经β-葡萄糖苷酸酶—芳基硫酸酯酶避光水解16 h,3.0 mL正己烷萃取、涡旋、离心,取上层有机相,重复萃取两次,合并萃取液,氮吹至近干,再复溶于20%乙腈水溶液中。流动相为水和10%异丙醇甲醇溶液,梯度洗脱模式洗脱,CORTECS C18色谱柱分离,ESI-模式测定尿液中11种羟基多环芳烃浓度,内标法定量分析。结果11种羟基多环芳烃线性关系良好,相关系数(r)均大于0.997。方法的检出限为0.01~0.10 ng/mL;日间回收率为79.8%~97.3%,精密度为1.9%~4.7%(n=3);日内回收率为78.6%~92.3%,精密度为3.7%~7.1%(n=3)。结论该方灵敏度高,准确可靠,适用于人群中多种羟基多环芳烃的监测。
文摘The reaction of a series of hydroxy-substituted polycyclic aromatic hydrocarbons(PAHs)with nitric oxide containing trace O 2 was carried out in CH 2Cl 2 at room temperature. The products identified by IR, NMR and HRMS indicate that the mono nitration at para- or ortho-position with respect to hydroxy group on the benzene ring occurred regioselectively. The reactions are assumed to be initiated by single electron transfer and the reaction intermediates may be resonance stabilized phenoxy-like radicals.
