No abstract

The relative proportions of the major smoke components and N-containing components in the semi-volatile phase and the non-volatile phase from some varieties of tobacco, i.e. flue-cured, Burley and Turkish tobacco, were determined. In flue-cured tobacco smoke, 2-furfural, 5-methylfurfural, 5-hydroxymethylfurfural and other carbohydrate pyrolysates, catechols and organic acids were present in higher concentrations than in the smoke from the other tobaccos. In Burley tobacco smoke, myosmine was present in much higher concentration than in the smoke from the other tobaccos. In Turkish tobacco smoke, glycerol and β-methylvaleric acid were both present in much higher concentrations.

No abstract

Changes were investigated in trace alkaloid composition of and leaf lamina during curing. Seventeen alkaloids were identified. The total level of trace alkaloids decreased by approximately 60% in both MC-1 (flue-cured) and Burley-21 (air-cured).Although the level of most alkaloids also decreased, 2,3 /-bipyridyl and four nornicotine derivatives, i.e. N'-hexanoyl-, TV'-octanoyl-, r-(6-hydroxyoctanoyl)-and r-(7-hydroxyoctanoyl)-nornicotine, increased during curing in both varieties. Differences in the trace alkaloid composition of cured leaf lamina among MC-1 (bright), Burley-21 (burley) and Basma (Orient) were also studied. In all varieties, TV'-formylnornicotine, nicotyrine, anabasine and cotinine were present at high concentrations relative to the other trace alkaloids. The alkaloids which were present in a relatively high concentration in particular varieties, were as follows: MC-1; TV'-formylanabasine, Burley-21; TV'-hexanoyl-and TV'-octanoyl-nornicotine, and Basma; cotinine and TV'-formylanatabine.