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    • 2. 发明授权
    • Process for the preparation of riboflavin
    • 制备核黄素的方法
    • US4794081A
    • 1988-12-27
    • US643226
    • 1984-08-21
    • Kimitoshi KawaiAkinobu MatsuyamaShoichi Takao
    • Kimitoshi KawaiAkinobu MatsuyamaShoichi Takao
    • C12P25/00C12N1/16
    • C12P25/00
    • Riboflavin is obtained directly from the culture in a high yield by cultivating a riboflavin-producing microorganism in a medium using a lower (C.sub.1 to C.sub.4) aliphatic compound, separating riboflavin contained in the culture in the form of heated aqueous solution from solid matters, and crystallizing riboflavin from the heated aqueous solution.Riboflavin is also prepared in a high yield by cultivating a riboflavin-producing yeast belonging to the genus Saccharomyces which has purine requirements and/or resistance to 3-amino-1,2,4-triazole in a medium and collecting riboflavin formed and accumulated in the medium.Moreover, riboflavin is prepared in a high yield even in the presence of iron ions by preliminarily cultivating in liquid a riboflavin-producing yeast belonging to the genus Saccharomyces and then cultivating it in a riboflavin-producing medium containing zinc ions.
    • 通过使用下(C1〜C4)脂肪族化合物在培养基中培养产生核黄素的微生物,从培养物中以固体物质加热的水溶液的形式分离核黄素,从高产量的培养物中获得核黄素,以及 从加热的水溶液中结晶核黄素。 核黄素还通过在培养基中培养属于酵母属的产生核黄素的酵母,其具有嘌呤要求和/或对3-氨基-1,2,4-三唑的抗性,并且收集形成并积累的核黄素 介质。 此外,即使在铁离子存在下,通过在液体中预先培养属于酵母属的产生核黄素的酵母菌素,然后在含有锌离子的产生核黄素的培养基中培养,也可以高产率制备核黄素。
    • 6. 发明授权
    • Heat-stable D-aminoacylase
    • 热稳定的D-氨基酸酰基酶
    • US06902915B2
    • 2005-06-07
    • US10361509
    • 2003-02-07
    • Shinji TokuyamaAkinobu Matsuyama
    • Shinji TokuyamaAkinobu Matsuyama
    • C12N15/09C12N1/20C12N1/21C12N9/80C12N15/55C12P13/04C12P13/06C12P13/12C12P13/20C12P13/22C12R1/465C12N9/78C12P13/08
    • C12R1/465C12N9/80C12P13/04
    • The present invention provides a novel D-aminoacylase, as well as method for producing a D-amino acid using the same. In order to achieve the above objective, the present inventors have succeeded in purifying heat-stable D-aminoacylase from microorganisms belonging to the genus Streptomyces by combining various purification methods. Furthermore, the present inventors found that the purified heat-stable D-aminoacylase is useful in industrial production of D-amino acids. By utilizing the heat-stable D-aminoacylase, it is possible to readily and efficiently produce the corresponding D-amino acids from N-acetyl-DL-amino acids (for example, N-acetyl-DL-methionine, N-acetyl-DL-valine, N-acetyl-DL-tryptophan, N-acetyl-DL-phenylalanine, N-acetyl-DL-alanine, N-acetyl-DL-leucine, and so on).
    • 本发明提供了一种新的D-氨基酸酰基酶,以及使用其制备D-氨基酸的方法。 为了实现上述目的,本发明人通过组合各种纯化方法成功地从属于链霉菌属的微生物纯化热稳定的D-氨基酰化酶。 此外,本发明人发现纯化的热稳定性D-氨基酸酰基酶可用于工业生产D-氨基酸。 通过利用热稳定的D-氨基酸酰化酶,可以容易且有效地从N-乙酰基-DL-氨基酸(例如,N-乙酰基-DL-甲硫氨酸,N-乙酰基-DL- 缬氨酸,N-乙酰基-DL-色氨酸,N-乙酰基-DL-苯丙氨酸,N-乙酰基-DL-丙氨酸,N-乙酰基-DL-亮氨酸等)。