一鹽基脂肪酸類の腐敗菌・チフス菌及びコレラ菌に對する殺菌作用(第二報)

抄録

In the previous paper⁽²⁾, I have reported the bactericidal activity of saturated monobasic fatty acids (C₁-C₁₀) on Staphylococcus pyogenes aureus, Proteus vulgaris H_AUSER, Bacillus typhosus and Vibrio cholerae. The present paper deals with the bactericidal activity of saturated monobasic higher fatty acids (C₁₁-C₁₈) on the above-mentioned kinds of bacteria using the method described in the previous paper⁽¹⁾.
The results obtained are summarized as follows:- (1) As regards the bactericidal activity of the saturated solutions of acids, from undecylic acid (C₁₁) to stearic acid (C₁₈), undecylic acid leads the list, and lauric acid comes next. The acids with C₁₄-C₁₈ have no bactericidal power, but even afford better conditions to microorganisms for sustaining life.
(2) Hydrogen-ion, dissociated from acids, concerns little with the bactericidal action of these acids.
(3) Anions of C₁₁-C₁₂ acids have bactericidal power to a certain measure.
(4) Among Na-, Ca-and NH₄-salts, the last one has the weakest bactericidal power.
(5) Undissociated molecules have also remarkable effects on the bactericidal activites of undecylic and lauric acids.