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Method for the preparation or removal of tryptophane and other substances from theirsolutions

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1. THE METHOD OF EXTRACTING TRYPTOPHANE FROM A SOLUTION CONTAINING TRYPTOPHANE AND OTHER AMINO ACIDS, SAID METHOD COMPRISING ADJUSTING THE PH OF THE SOLUTION TO ABOVE 10 AND PLACING IT IN CONTACT WITH A STRONGLY BASIC ANION EXCHANGE RESIN, SAID RESIN HAVING PREVIOUSLY BEEN TREATED WITH A SOLUTION CONTAINING AN EXCESS OF HYDROXYL IONS, WHEREBY TRYPTOPHANE IN THE SOLUTION IS ADSORBED BY THE RESIN TO THE EXCLUSION OF SUBSTANTIALLY ALL OTHER AMINO ACIDS IN THE SOLUTION, THEN ELUTING THE TRYPTOPHANE FROM THE RESIN, AND THEN EFFECTING CRYSTALLIZATION OF THE TRYPTOPHANE FROM THE RESULTING ELUATE.
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