The Journal of General Physiology
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The Journal of General Physiology, Vol 6, 201-205, Copyright © 1923 by The Rockefeller University Press

ARTICLE

CONDUCTIVITY TITRATION OF GELATIN SOLUTIONS WITH ACIDS

David I. Hitchcock 1

1 From the Laboratories of The Rockefeller Institute for Medical Research.

Titrations have been made, by the conductivity method, of gelatin solutions with hydrochloric and sulphuric acids. The results indicate an end-point at about 8.6 cc. of N/10 acid per gm. of gelatin, or a combining weight of about 1,160. These results are in fair agreement with those previously obtained by the hydrogen electrode method. Better agreement between the two methods was found in the case of deaminized gelatin. The data are in accord with a purely chemical conception of the combination between protein and acid.

Submitted on October 4, 1923


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