Effect of Dyes on Yeast Fermentation as in Fluenced by Hydrogen-ion Concentration "
نویسنده
چکیده
The effect of hydrogen-ion concentration on the toxicity of various organic and inorganic compounds has been studied by a number of investigators. In general the results have shown that the toxicity of anions is increased by increasing the hydrogen-ion concentration and that of cations is increased by decreasing the hydrogen-ion concentration, provided the reaction does not affect the solubility of the compound studied. The earlier literature on this subject has been reviewed elsewhere {11).^ The present investigation is concerned with the influence of hydrogen-ion concentration upon the effect of certain acid and basic dyes on yeast fermentation. Von Euler and Florell {3) in studying the effect of dyes on yeast found that in the presence of 0.05 percent of the acid dye ponceau 3R, fermentation was checked a little more at pH 3.8 than at pH 6.1, and at a 0.5 percent concentration of the dye, fermentation was checked considerably more at pH 2.2 to 2.4 than at pH 6.1 to 6.3. Hydrogen-ion concentration had little effect upon the toxicity of the basic dye, méthylène blue. No other investigations on the influence of hydrogenion concentration on the toxicity of dyes to yeast have been noted by the authors. INVESTIGATION
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