Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1986-04-02
1988-09-06
Hollrah, Glennon H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
548469, 548496, C07D20908, C07D20920
Patent
active
047694742
ABSTRACT:
A process for purifying tryptophan so as to contain almost no unreacted indole and a process for recovering unreacted indole with a very high percentage are provided, the purification process comprising passing a reaction fluid of tryptophan prepared from indole as raw material by means of an enzyme function, through a porous type, cation exchange resin layer, to cause the ion exchange part of the resin to absorb tryptophan, while to cause the porous part of the resin to adsorb indole, followed by eluting only the tryptophan with an alkali or acid aqueous solution, and the recovery process comprising subjecting tryptophan to repeated treatments of adsorption onto and elution from the ion exchange part of the resin and regeneration followed by eluting indole adsorbed onto the porous part of the resin with a water-containing organic solvent miscible with water and isolating indole from the resulting elute.
REFERENCES:
patent: 3420788 (1969-01-01), Solms
patent: 3450712 (1969-06-01), Samejima et al.
patent: 4357276 (1982-11-01), Takasa et al.
Matsumoto Toshio
Miyahara Shoichiro
Miyahara Tooru
Nitta Kazunari
Hollrah Glennon H.
Jeffers Albert L.
Mitsui Toatsu Chemicals Inc.
Springer David B.
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