煙草の放射線照射
1967 年 2 巻 1 号 p. 99-105
詳細
1967 年 2 巻 1 号 p. 99-105
For determining the feasibility of using irradiation in the preparation of tobacco, a preliminary study on irradiation of tobacco was attempted at our laboratory. The results obtained are as follows:
1) Tobacco leaves in the drying process acquired good aroma of fermented or aged tobacco by irradiation at a dose of 1 × 106 rads of Co-60 γ-rays, whereas control unirradiated leaves had green-note smell of green leaves.
2) Tobacco flea beetles and tobacco moths and their larvae were killed in a dose less than 1.7×105 rads of γ-rays.
3) “ Peace” (one of the representative brand of cigarette in Japan) irradiated in a dose of l×106 rads of γ-rays was prefered after 3-4 weeks to unirradiated cigarette, many of panel members appealed that irradiated cigarette became milder than the control.
4) Bacterial plate count on the irradiated cigarette after one month storage in a show window case was only a few per piece, whereas that of the control of unirradiated cigarette was of the order of 2×104 per piece.
5) Reduction in concentration of nicotine in aqueous solution was observed by exposure of various doses of γ-irradiation, but nicotine content of irradiated cigarette was not significantly different from the control unirradiated cigarette. For the explanation of the difference between the results in vitro and in vivo, tobacco leaf was stained with Dragendorfs reagent and many red spots (nicotine) were found to localize which led to the assumption that nicotine in a leaf might be contained not diffusely but concentratedly.
No significant difference in nicotine contents of main stream of cigarette smoke between the cigarette irradiated in a dose of 1×106 rads and unirradiated cigarette was observed.
6) There was no significant difference in crude tar content from cigarette smoke between the cigarette irradiated in a dose of 1×106 rads and unirradiated cigarette.
7) No significant difference was observed in maximum temperature of smoking between the irradiated and unirradiated cigarette.
8) Toxicity test of the water in which the main stream smoke of the irradiated cigarette was dissolved by using Japanese gold fishes did not show the difference from the unirradiated.
