暖冬期に於ける寒天の変敗防止に関する研究-III : “ダンカン”に関与する細菌に対する防腐剤の効力について

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For the purpose of the prevention of agar and its intermediate product, “tokoroten” from spoilage, the authors fundamentally experimented on the bacteriostatic effects of several antiseptics on the causative bacteria in the spoilage, and obtained the following results. (1) Benzalkonium chloride, hydrogen peroxide and sodium hypochlorite inhibited remarkably the growth of an agar-decomposing bacterium at the concentration of 1/10000, and chlorotetracycline (aureomycin) and tetracycline (achromycin) inhibited fairly at the concentration of 1/100000. Dehydro acetic acid, sorbic acid, nitro furyl acrylic amide and sodium peroxide were scarcely effective at the concentration of 1/10000. (2) Sodium hypochlorite and hydrogen peroxide inhibited remarkably the growth of mixed culture of bacteria which were inferred as causative microÖrganisms of agar spoilage, and benzalkonium chloride, chlorotetracycline and tetracycline inhibited fairly.
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