The Journal of General Physiology
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The Journal of General Physiology, Vol 19, 773-780, Copyright © 1936 by The Rockefeller University Press

ARTICLE

THE SOLUBILITIES OF THE l-DIHALOGENATED TYROSINES IN ETHANOL-WATER MIXTURES AND CERTAIN RELATED DATA

Philip S. Winner 1 and Carl L. A. Schmidt 1

1 From the Division of Biochemistry, University of California Medical School, Berkeley

1. The solubilities of l-tyrosine, dichloro-l-tyrosine (hydrated), dibromo-l-tyrosine (anhydrous), and diiodo-l-tyrosine in ethanol-water mixtures at 25° have been determined.

2. It was found that the solubilities of the dihalogenated substitution products of l-tyrosine are increased by addition of ethanol up to a certain concentration. Further addition of ethanol leads to a decrease in solubility. The solubility of l-tyrosine is decreased by addition of ethanol.

3. Dichloro-l-tyrosine (hydrated) was found to change to the anhydrous form when allowed to stand in the presence of ethanol.

4. The apparent heat of solution of diiodo-l-tyrosine in an ethanol-water mixture has been determined.

5. The solubility of dl-thyroxine at 30° has been determined in urea solution, ethanol, dioxan, ethylene glycol, and propylene glycol.

 Accepted on September 24, 1935


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