A comprehensive methodology for the chiral separation of 40 tobacco alkaloids and their carcinogenic E/Z-(R,S)-tobacco-specific nitrosamine metabolites

作者：Hellinghausen Garrett; Roy Daipayan; Wang Yadi; Lee Jauh T; Lopez Diego A; Weatherly Choyce A; Armstrong Daniel W^*

来源：Talanta, 2018, 181: 132-141.

DOI：10.1016/j.talanta.2017.12.060

• Nicotine
• Tobacco
• Nitrosamine carcinogens
• Isomeric alkaloids
• Electrospray ionization liquid chromatography mass spectrometry
• Enantiomer separation

The predominant enantiomer of nicotine found in nature is (S)-nicotine and its pharmacology has been widely established. However, pharmacologic information concerning individual enantiomers of nicotine-related compounds is limited. Recently, a modified macrocyclic glycopeptide chiral selector was found to be highly stereoselective for most tobacco alkaloids and metabolites. This study examines the semi-synthetic and native known macrocyclic glycopeptides for chiral recognition, separation, and characterization of the largest group of nicotine-related compounds ever reported (tobacco alkaloids, nicotine metabolites and derivatives, and tobacco specific nitrosamines). The enantioseparation of nicotine is accomplished in less than 20 s for example. All liquid chromatography separations are mass spectrometry compatible for the tobacco alkaloids, as well as their metabolites. Ring-closed, cyclized structures were identified and separated from their ring-open, straight chain equilibrium structures. Also, E/Z-tobacco-specific nitrosamines and their enantiomers were directly separated. E/Z isomers also are known to have different physical and chemical properties and biological activities. This study provides optimal separation conditions for the analysis of nicotine-related isomers, which in the past have been reported to be ineffectively separated which can result in inaccurate results. The methodology of this study could be applied to cancer studies, and lead to more information about the role of these isomers in other diseases and as treatment for diseases.

• 出版日期2018-5-1