皇帝制度
Determination of (R)-(+)- and (S)-(-)-Nicotine杏鲍菇炒青椒
Chirality in Puff Bar E-Liquids by 1H NMR Spectroscopy, Polarimetry, and Gas
引首Chromatography-Mass Spectrometry 期刊名称： Chemical Rearch in Toxicology
作者： Anna K Duell,Paul J Kerber,Wentai Luo,David H Peyton学习励志语
年份： 2021年
要不要二胎
预付款担保摘要：Tobacco products generally contain tobacco-derived nicotine (TDN; having 99+% (S)-(-)-nicotine). Recent United States regulation has led some producers to transition to synthetic ("tobacco-free") nicotine. For example, Puff Bar is now marketed with tobacco-free nicotine (TFN; presumed to be racemic). To evaluate the claim that the new products contain TFN, we evaluated the prence of the two nicotine optical isomers by 1H NMR spectroscopy, polarimetry, and gas chromatography-mass spectrometry. Older Puff Bars were found to contain (S)-(-)-nicotine, and newer "TFN" Puff Bars were found to contain both (R)-(+) and (S)-(-) isomers-indicating TFN, albeit with slightly more of the (S)-(-)-nicotine form.最大的贪官
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