Comparison of Capacity of Some Nitrated Phenols to Stimulate Respiration of Yeast.

Abstract

We have shown that the action of several of the nitrated phenols on the respiration of yeast may be excitatory or inhibitory, depending on the dosage, and that the undissociated form is the active agent in such stimulation or inhibition.1, 2, 3 A method for comparing the activities of nitrated phenols as metabolic stimulants has been developed and applied to 3 of the dinitrophenols and to the mononitrophenols.3 We present herewith the results of experiments designed to compare the activities of 5 nitrated phenols which have been used extensively as metabolic stimulants. These are 2–4 dinitrophenol,4 4–6 dinitro-o-cresol,5 2–4 dinitro-α-naphthol,6 2–4 dinitro-cyclo-pentyl phenol6 and 2–4 dinitro-cyclo-hexyl phenol.6 The last 2 compounds were provided through the kindness of Dr. M. L. Tainter, who obtained them from Hoffman, LaRoche and Company. In every case aqueous solutions of the sodium salts were employed.The pure yeast culture and the experimental methods have been described elsewhere.2, 3 In every ca...