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    PROCESS FOR PURIFYING TRYPTOPHAN
    2.
    发明专利
    PROCESS FOR PURIFYING TRYPTOPHAN 未知

    公开(公告)号：CA1267652A

    公开(公告)日：1990-04-10

    申请号：CA506081

    申请日：1986-04-08

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MIYAHARA SHOICHIRO ,  MATSUMOTO TOSHIO ,  MIYAHARA TOORU ,  NITTA KAZUNARI

    IPC: C12N9/00 ,  C07D209/20 ,  C12P13/22 ,  C07D209/08

    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 adsorb 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.

    3.
    发明专利
    未知

    公开(公告)号：DK388888D0

    公开(公告)日：1988-07-12

    申请号：DK388888

    申请日：1988-07-12

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MIYAHARA SHOICHIRO ,  MATSUMOTO TOSHIO ,  YANAKA MAKOTO ,  MIYAHARA TOORU ,  NITTA KAZUNARI ,  SAKAGUCHI AKIO

    IPC: C12N9/00 ,  C12N9/88 ,  C12N9/96 ,  C12P13/22

    Abstract: A method of preparing L-tryptophan by reacting indole and serine and using an aqueous solution of enzymes which are extracted from cells. After the reaction, the pH value of the reaction mass is adjusted to above 10 by ammonia. The L-tryptophan can be dissolved in the solution in a high concentration, so purification and separation are facilitated and the loss of L-tryptophan minimalized. The preparation of a stable aqueous solution of enzymes is also provided wherein an extracted enzyme solution is heated above 40 DEG C.

    6.
    发明专利
    未知

    公开(公告)号：MX164755B

    公开(公告)日：1992-09-22

    申请号：MX651387

    申请日：1987-05-18

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： MIYAHARA SHYDICHIRO ,  KAMIGUCHI TOSHIAKI ,  MIYAHARA TOORU ,  HASHIMUKAI TODASHI ,  NITTA KASUNARI

    IPC: C12P13/12 ,  C07C323/58

    Abstract: L-Serine is reacted with hydrogen sulfide or an alkali metal sulfide or hydrosulfide in the presence of an enzyme to form L-cysteine and the L-cysteine is oxidized to produce L-cystine. Their reaction is carried out in the presence of dimethyl sulfoxide, which is employed as an oxidizing agent, so that the L-cysteine which is formed by the enzyme reaction may be successively converted to L-cystine in the reaction system.

    10.
    发明专利
    未知

    公开(公告)号：DE69300712T2

    公开(公告)日：1996-07-25

    申请号：DE69300712

    申请日：1993-02-13

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YANAKA MAKOTO ,  MIYAHARA TOORU ,  URA DAISUKE ,  FUKUHARA NOBUHIRO

    IPC: C07C227/42 ,  C12P13/22 ,  C07C229/36

    Abstract: The purification of L-phenylalanine can be achieved by removing a solid content and an ammonia source from a reaction solution obtained by reacting cinnamic acid with ammonia in the presence of phenylalanine ammonia lyase, extracting the aqueous L-phenylalanine solution with toluene, and then carrying out solid/liquid separation while the solution is concentrated to effectively separate L-phenylalanine from the remaining unreacted cinnamic acid.

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