Fig 5. Chiral analysis of the (R)- and (S)-nornicotine analysis in tobacco-derived and synthetic nicotine samples.

(a) Example chromatography in a racemic nornicotine standard, TDN-1, and SyN-2 (left-to-right), and (b) comparison of the (R)/(S)-nornicotine ratio to the corresponding (R)/(S)-nicotine ratio.