Process for the separation of L-leucine and L-isoleucine
    2.
    发明授权
    Process for the separation of L-leucine and L-isoleucine 失效
    分离L-亮氨酸和L-异亮氨酸的方法

    公开(公告)号:US4562153A

    公开(公告)日:1985-12-31

    申请号:US612803

    申请日:1984-05-22

    摘要: The separation of L-leucine and L-isoleucine in aminoacid mixtures containing at least 30 weight percent L-leucine, at most 70 weight percent L-isoleucine and at most 40 weight percent of other aminoacids is accomplished by acetylating the mixture, precipitating the acetylation product by acidification, subjecting the aqueous solution to a saponification by an L-aminoacid acylase until 25 to 95% of the N-acetyl-L-leucine is saponified, crystallizing pure L-leucine from the saponification mixture and separating it off, isolating N-acetyl-L-isoleucine from the mother liquor and saponifying it in known manner to the free aminoacid and isolating the free aminoacid.

    摘要翻译: L-亮氨酸和L-异亮氨酸在含有至少30重量%L-亮氨酸,至多70重量%L-异亮氨酸和至多40重量%其它氨基酸的氨基酸混合物中的分离通过乙酰化该混合物来实现,使乙酰化 通过酸化将水溶液进行L-氨基酸酰基转移酶皂化,直到25-95%的N-乙酰基-L-亮氨酸被皂化,从皂化混合物中结晶出纯的L-亮氨酸并将其分离出来,分离N 乙酰基-L-异亮氨酸,并以已知方式将其皂化成游离氨基酸并分离游离氨基酸。

    Process for obtaining pure L-leucine
    4.
    发明授权
    Process for obtaining pure L-leucine 失效
    获得纯L-亮氨酸的方法

    公开(公告)号:US4562152A

    公开(公告)日:1985-12-31

    申请号:US612802

    申请日:1984-05-22

    摘要: Pure L-leucine is obtained from an aminoacid mixture which contains at least 45 weight percent L-leucine, at most 40 weight percent L-isoleucine and at most 25 weight percent of other aminoacids by acetylating the mixture, precipitating the acetylation product by acidification, subjecting the acetylation product to a saponification by an L-aminoacid acylate until 30 to 95% of the N-acetyl-L-leucine employed is saponified and isolating the L-leucine from the saponification mixture.

    摘要翻译: 纯L-亮氨酸由含有至少45重量%L-亮氨酸,至多40重量%L-异亮氨酸和至多25重量%其它氨基酸的氨基酸混合物获得,通过乙酰化混合物,通过酸化沉淀乙酰化产物, 使乙酰化产物用L-氨基酸酰化物进行皂化,直到使用的N-乙酰基-L-亮氨酸的30-95%皂化并从皂化混合物中分离出L-亮氨酸。

    Process for the recovery of S-(carboxymethyl)-(R)-cysteine and
S-(carboxymethyl)-(S)-cysteine
    5.
    发明授权
    Process for the recovery of S-(carboxymethyl)-(R)-cysteine and S-(carboxymethyl)-(S)-cysteine 失效
    S-(羧甲基) - (R) - 半胱氨酸和S-(羧甲基) - (S) - 半胱氨酸的回收方法

    公开(公告)号:US4551548A

    公开(公告)日:1985-11-05

    申请号:US477514

    申请日:1983-03-21

    摘要: The subject matter of the invention is a process for the recovery of S-(carboxymethyl)-(R)-cysteine and S-(carboxymethyl)-(S)-cysteine from a mixture of the two enantiomers. The mixture to be separated is dissolved in water in the presence of sufficient ammonia that the ammonium salt solution formed has a pH between 6 and 9. Then there is brought about in the solution of ammonium salt a state of supersaturation by the addition of seeding crystals of the ammonium salt of one of the two enantiomers, insofar as the starting material contains one of the two enantiomers in excess, the ammonium salt of this enantiomer, the ammonium salt of one of the two enantiomers is brought to crystallization and separated off. Subsequently by addition of seeding crystals of the ammonium salt of the other enantiomers to the remaining mother liquor the ammonium salt of this enantiomer is likewise brought to crystallization and separated off. Finally the respective S-(carboxymethyl)-cysteine is set free from the two ammonium salts.

    摘要翻译: 本发明的主题是从两种对映异构体的混合物中回收S-(羧甲基) - (R) - 半胱氨酸和S-(羧甲基) - (S) - 半胱氨酸)的方法。 待分离的混合物在足够的氨存在下溶解在水中,形成的铵盐溶液的pH值在6和9之间。然后在铵盐溶液中引入过饱和状态,加入晶种 的两种对映异构体之一的铵盐,只要起始原料含有过量的两种对映异构体之一,该对映异构体的铵盐,两种对映异构体之一的铵盐结晶并分离出来。 随后通过将其它对映异构体的铵盐的晶体晶体加入到剩余的母液中,同时将该对映异构体的铵盐进行结晶并分离。 最后,将各自的S-(羧甲基) - 半胱氨酸设定为不含这两种铵盐。

    Process for the separation of the racemate (R,S)-cysteine
    7.
    发明授权
    Process for the separation of the racemate (R,S)-cysteine 失效
    分离外消旋物(R,S) - 半胱氨酸的方法

    公开(公告)号:US4430509A

    公开(公告)日:1984-02-07

    申请号:US460858

    申请日:1983-01-25

    CPC分类号: C07H15/14

    摘要: To separate the racemate (R,S)-cysteine, the racemate is condensed in an inert solvent with an enantiomerically enantiomeric monosaccharide of the group of aldoses having 4 to 7 carbon atoms to form the corresponding 2-substituted thiazolidin-4-carboxylic acid and the mixture of diastereomers obtained separated from each other. Subsequently, the isolated unitary diastereomers are reacted in an inert solvent with a carbonyl reagent to split the ring and the enantiomerically pure cysteine in each case is isolated as such or as the corresponding cystine.

    摘要翻译: 为了分离外消旋体(R,S) - 半胱氨酸,外消旋体在惰性溶剂中与具有4至7个碳原子的醛糖组的对映异构体对映异构体单糖缩合形成相应的2-取代的噻唑烷-4-羧酸, 获得的非对映异构体的混合物彼此分离。 随后,将分离的单一非对映异构体在惰性溶剂中与羰基试剂反应以分裂环,并且每种情况下的对映体纯的半胱氨酸本身或相应的胱氨酸分离。

    Process for the production of L-proline
    10.
    发明授权
    Process for the production of L-proline 失效
    生产L-脯氨酸的方法

    公开(公告)号:US4469876A

    公开(公告)日:1984-09-04

    申请号:US418841

    申请日:1982-09-16

    CPC分类号: C07D207/16 C07D207/22

    摘要: L-proline is produced from the methyl or ethyl ester of L-pyroglutamic acid by reacting this with at least twice the molar amount of phosgene to form the corresponding 1-chlorocarbonyl-5,5-dichloroproline ester, producing the corresponding 2-chloro-1-chlorocarbonyl-pyrrolin-(2)-carboxylic acid ester-(5) therefrom by splitting off hydrogen chloride, catalytically hydrogenating the pyrrolin-(2) compound to the corresponding N-chlorocarbonyl-proline ester and hydrolyzing the latter with acid to form L-proline.

    摘要翻译: 通过将其与至少两倍摩尔量的光气反应形成相应的1-氯羰基-5,5-二氯脯氨酸酯,由L-焦谷氨酸的甲酯或乙酯制备L-脯氨酸,产生相应的2-氯 - 通过分离氯化氢,将吡咯啉 - (2)化合物催化氢化成相应的N-氯羰基 - 脯氨酸酯并用酸水解后者形成1-氯羰基 - 吡咯啉 - (2) - 羧酸酯 - (5) L-脯氨酸。