Method for crystallization of optically active tryptophan

Details Method for crystallization of optically active tryptophan Method for crystallization of optically active tryptophan

1991-03-15

1991-12-03

Springer, David B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20920

Patent

active

050702084

ABSTRACT:
Optically active tryptophan is crystallized by a modification of a method of crystrallization of optically active tryptophan through neutralization by mixing an acidic or alkaline aqueous solution of optically active tryptophan, which is obtained by the removal of impurities from an acidic or alkaline aqueous solution of optically active tryptophan containing impurities which inhibit flocculation and crystallization of optically active tryptophan, with an alkali or an acid, by combining portions of an alkali or acid with portions of an acidic or alkaline aqueous solution of optically active tryptophan, from which the impurities have been removed, thereby neutralizing the aqueous solution containing optically active tryptophan such that the pH of the solution to be crystallized is kept in a range of 3 to 8, and simultaneously crystallizing optically active tryptophan as flocculated crystals.

REFERENCES:
patent: 3450712 (1969-06-01), Hirotoshi et al.

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