Abstract
The mode of action of diethyltin dichloride as a representative of the antibacterial dialkyl-substituted tin compounds was studied forEscherichia coli. The oxygen uptake by resting cells ofEicoli with glucose, lactate, pyruvate or glutamate as substrates is strongly inhibited by diethyltin dichloride at a concentration of 0.08mm which is still below the minimum inhibitory concentration for growth on a rich medium. Inhibition of oxygen uptake with glucose or lactate as substrates is accompanied by an increase in the amount of pyruvic acid accumulating. A slight rise in the concentration of α-ketoglutaric acid results from the inhibition of succinate and malate oxidation by diethyltin dichloride, while inhibition of α-keto acid production is obtained with glutamate as a substrate. Anaerobically, with glucose as a substrate, ethanol formation as well as the production of carbon dioxide and hydrogen are inhibited by diethyltin dichloride. In many respects the effects of diethyltin dichloride on metabolism resemble those of arsenite.
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