Yukiteru Obi

Selection of Cultured Tobacco Cell Strains Producing High Levels of Ubiquinone 10 by a Cell Cloning Technique

Strains producing high levels of ubiquinone 10 were isolated from tobacco cell suspension cultures by a cell cloning technique, and the UQ content of these cell strains was analyzed by high performance liquid chromatography. Three strains with high UQ yields in suspension culture were selected and used for investigations on the necessary cultural conditions for UQ production. Sucrose concentration, 2,4-D concentration and culture temperature did not have marked effects on UQ formation. These results differed from those of the original cell lines. Furthermore, the addition of yeast extract to the medium promoted cell growth in these strains remarkably but did not enhance UQ production in the cell strains. According to these investigations, UQ production was increased to 15mg/liter and the UQ level to 1890 μg/g dry wt. of cells after 11 days of incubation.

Evaluation of Tobacco Quality from Pyrolytic Aspects: Part VII. Relationship between Chemical Constituents of Tobacco Leaves and Gaseous Constituents of Cigarette Smoke

Relationship between the chemical constituents of tobacco leaves and the gaseous con stituents of cigarette smoke from which K value) was computed was discussed and the following presuppositions were demonstrated to be correct. 1. Fibrous substances in tobacco leaves are the main precursors of acetaldehyde, pro pionaldehyde, acrolein, acetone, methyl ethylketone, diacetyl, methanol, furan, an unknown compound, No. 6 and an unknown compound, No. 16 in cigarette smoke. 2. Sugars in tobacco leaves are the main precursors of 2-methylfuran and 2,5-dimethyl furan in cigarette smoke. 3. Resinous substances in tobacco leaves are the main precursors of isoprene and an unknown compound, No. 2 in cigarette smoke.