Recovery of L-amino acid isomers from their racemic mixtures

Details Recovery of L-amino acid isomers from their racemic mixtures Recovery of L-amino acid isomers from their racemic mixtures

1988-12-14

1989-07-11

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562402, C07B 5700

Patent

active

048474096

ABSTRACT:
A method for the isolation of a substantially pure L-isomer of an amino acid from its D,L racemic mixture does not require the use of a resolving agent, the formation of a derivative of the amino acid or additional enzymic reactions.The method is based upon the concept of the equal saturation point wherein the L-isomer can be separated from the D-isomer by precipitation of the L-isomer when the relative concentration of the D-isomer is less than 7.0% or by precipitation of the D,L racemate when the relative concentration is greater than 7.0%. Selective crystallization through seeding allows for further isolation of pure L-isomer when its relative concentration in solution is very low.

REFERENCES:
patent: 2556917 (1951-06-01), Hambrock
patent: 2657230 (1953-10-01), Rogers
patent: 4613688 (1986-09-01), Inone et al.

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