Method for recovery of optically active tryptophane

Details Method for recovery of optically active tryptophane Method for recovery of optically active tryptophane

1984-11-07

1986-05-13

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D20920

Patent

active

045888183

ABSTRACT:
A method for recovery of optically active tryptophane, which comprises filtering a solution of optically active tryptophane containing impurities through a semi-permeable membrane; adding a lower alcohol or a ketone to the filtrate; maintaining the solution containing the lower alcohol or ketone at an alkaline pH and a temperature higher than the .alpha./.beta. crystalline transition point; adding acid to the solution, thereby causing crystals of optically active tryptophane to form in the solution; and separating the crystals from the solution containing impurities, is disclosed. This method avoids the use of resins in the purification steps.

REFERENCES:
patent: 3129122 (1964-09-01), Sacoji et al.
patent: 3825559 (1974-07-01), Tazuke et al.

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