Comparisons of Acids in Smoke of Lamina and Midrib of Flue-cured Tobacco Leaves

Acids of lamina and midrib cigarette smoke were converted into trimethylsilyl derivatives and they were analyzed with glass capillary column gas chromatography. Then compositional differences of acids between lamina and midrib cigarette smoke were discussed. The concentrations of organic acids were higher for lamina cigarette smoke than for midrib cigarette smoke. Large concentration difference were found in formic, acetic, propionic, lactic, glycolic, furoic, benzoic, phenylacetic, fumalic and m-hydroxybenzoic acid. Succinic and methylsuccinic acid were similar in lamina smoke and in midrib smoke.

A large amount of 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one(amino-carbonyl reaction product) was identified for the first time in lamina smoke.