Effects of Textile Finishing Agents on the Growth of Tetrahymena.
1976 Volume 20 Issue 1 Pages 16-20
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1976 Volume 20 Issue 1 Pages 16-20
The possibility to detect the toxicity of chemical substances by observing the growth of ciliate protozoan ‟Tetrahymena” cultivated in the medium with the chemical substance is now being studied in our laboratory.
As a part of the study, toxity of six kinds of raw material of cloth-softners and of two kinds of cloth-softners on the market have been investigated by the method above mentioned, and the toxicitis were compared with that of Formalin.
The growth of Tetrahymena was not hindered by the low concentration of every raw material of cloth-softner, but over some concentration the growth was hindered sever er in proportion to the increase of concentration. When the toxicity of six kinds of raw materials of cloth-softners and Formalin were compared by the concentration by which the growth of Tetrahymena was hindered to 50% of normal growth, the order of toxicity of the chemical substances were found to be as follows.
(C-2＞N-1＞A-2＞Formarin＞C-2＞A-1＞N-2.)
One cloth-softner on the market accelerated the growth of Tetrahymena by the addition of low concentration of the substance into the medium, but the other cloth-softner did not show any effect in the growth of Tetrahymena by low concentration. Both cloth-softners hindered the growth of Tetrahymena remarkably when they are added to the medium over 5,000 ppm.
