The Journal of General Physiology
Avanti Polar Lipids
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The Journal of General Physiology, Vol 6, 457-462, Copyright © 1924 by The Rockefeller University Press

ARTICLE

THE ISOELECTRIC POINT OF GELATIN AT 40°C

David I. Hitchcock 1

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

Measurements have been made at 40°C. of the osmotic pressure and viscosity of 1 per cent gelatin solutions containing varying amounts of hydrochloric acid or sodium hydroxide. Each property was found to exhibit a decided minimum near pH 4.7. In the osmotic pressure experiments the pH of the inside solutions was greater than that of the outside solutions at pH values below 4.7, while it was less than that of the outside solutions at values above pH 4.7. These results indicate that gelatin at 40°C. retains its isoelectric point at about pH 4.7.

Submitted on January 18, 1924


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