Quantitation of 4-Oxo-4-(3-pyridyl)butanoic Acid and Enantiomers of 4-Hydroxy-4-(3-pyridyl)butanoic Acid in Human Urine: A Substantial Pathway of Nicotine Metabolism
作者:Stephen S. Hecht、Dorothy K. Hatsukami、Leo E. Bonilla、J. Bradley Hochalter
DOI:10.1021/tx980214i
日期:1999.2.1
4-oxo-4-(3-pyridyl)butanoic acid (keto acid) and the enantiomers of 4-hydroxy-4-(3-pyridyl)butanoic acid (hydroxy acid) to test our hypothesis that (S)-hydroxy acid could be a biomarker of metabolic activation of the tobacco-specific carcinogens 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) and N'-nitrosonornicotine (NNN) while (R)-hydroxy acid would be formed predominantly from nicotine, as indicated
建立了液相色谱-常压化学电离串联质谱(LC-APCI-MS / MS)方法分析人尿液中4-氧-4-(3-吡啶基)丁酸(酮酸)及其对映体的方法。 4-羟基-4-(3-吡啶基)丁酸(羟基酸)验证了我们的假设,即(S)-羟基酸可能是烟草特异性致癌物4-(甲基亚硝胺基)-1-(如对大鼠的研究表明,3-吡啶基-1-丁酮(NNK)和N'-硝基异烟碱(NNN),而(R)-羟基酸主要由尼古丁形成。从吸烟者和停止吸烟并使用尼古丁透皮系统(尼古丁贴剂)3周后的同一人中收集尿液。如果(S)-羟基酸是NNK和NNN代谢活化的生物标志物,吸烟者的尿中其含量应高于尼古丁贴片使用者,因为烟草烟雾而非尼古丁贴片中含有NNK和NNN。内标[2,2,3,3,4-D5]羟基酸被添加到等分的尿液中,然后进行固相萃取。将含羟基酸的洗脱液用酸性甲醇酯化,然后用(S)-(-)-α-甲基苄基异氰酸酯处理,生成甲基-4(S)-或甲基-4(R)-[(S)-α