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    Method of producing L-cystine
    4.
    发明公开
    Method of producing L-cystine 失效
    Verfahren zur Herstellung von L-Cystin。

    公开(公告)号：EP0272365A1

    公开(公告)日：1988-06-29

    申请号：EP87106729.4

    申请日：1987-05-08

    申请人： MITSUI TOATSU CHEMICALS, Inc.

    发明人： Miyahara, Shyoichiro ,  Kamiguchi, Toshiaki ,  Miyahara, Tooru ,  Hashimukai, Tadashi ,  Nitta, Kazunari

    IPC分类号： C07C323/58

    CPC分类号： C12P13/12

    摘要： 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.

    摘要翻译： 在酶的存在下，L-丝氨酸与硫化氢或碱金属硫化物或氢硫化物反应形成L-半胱氨酸，L-半胱氨酸被氧化生成L-胱氨酸。 它们的反应在作为氧化剂使用的二甲基亚砜存在下进行，使得通过酶反应形成的L-半胱氨酸可以在反应体系中依次转化为L-胱氨酸。

    Method of separating monohydrate of L-cysteine hydrochloride
    5.
    发明公开
    Method of separating monohydrate of L-cysteine hydrochloride 失效
    Verfahren zur Trennung von Monohydraten von L-Cysteine-Hydrochloriden。

    公开(公告)号：EP0250987A1

    公开(公告)日：1988-01-07

    申请号：EP87108503.1

    申请日：1987-06-12

    申请人： MITSUI TOATSU CHEMICALS, Inc.

    发明人： Miyahara, Shyoichiro ,  Kamiguchi, Toshiaki ,  Hashimukai, Tadashi ,  Nitta, Kazunari

    IPC分类号： C07C319/28 ,  C07C323/25 ,  C12P13/12

    CPC分类号： C12P13/12

    摘要： Hydrochloric acid is added to a solution containing L-cysteine, L-cystine, L-serine and an inorganic salt until it contains at least 15% by weight of hydrochloric acid. The solution is held at a temperature of at least 20°C so that the L-cystine and the inorganic salt may form a solid, and the solid is removed from the solution. The solution is cooled to a temperature not exceeding 10°C, so that crystallization may take place to form the monohydrate of L-cysteine hydrochloride. The monohydrate is separated from the L-serine in the solution.

    摘要翻译： 将盐酸加入到含有L-半胱氨酸，L-胱氨酸，L-丝氨酸和无机盐的溶液中，直至含有至少15重量％的盐酸。 将溶液保持在至少20℃的温度，使得L-胱氨酸和无机盐可以形成固体，并将固体从溶液中除去。 将溶液冷却至不超过10℃的温度，从而可能发生结晶以形成L-半胱氨酸盐酸盐的一水合物。 一水合物与溶液中的L-丝氨酸分离。