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    • 5. 发明授权
    • Method for crystallization of optically active tryptophan
    • 光学活性色氨酸结晶方法
    • US5070208A
    • 1991-12-03
    • US670182
    • 1991-03-15
    • Kenichi YaritaTakahisa TadaRyuichiro Kasatani
    • Kenichi YaritaTakahisa TadaRyuichiro Kasatani
    • C07D209/20
    • C07D209/20
    • Optically active tryptophan is crystallized by a modification of a method of crystrallization of optically active tryptophan through neutralization by mixing an acidic or alkaline aqueous solution of optically active tryptophan, which is obtained by the removal of impurities from an acidic or alkaline aqueous solution of optically active tryptophan containing impurities which inhibit flocculation and crystallization of optically active tryptophan, with an alkali or an acid, by combining portions of an alkali or acid with portions of an acidic or alkaline aqueous solution of optically active tryptophan, from which the impurities have been removed, thereby neutralizing the aqueous solution containing optically active tryptophan such that the pH of the solution to be crystallized is kept in a range of 3 to 8, and simultaneously crystallizing optically active tryptophan as flocculated crystals.
    • 通过将光学活性色氨酸的酸性或碱性水溶液通过从光学活性的酸性或碱性水溶液中除去杂质获得的光学活性色氨酸水溶液,通过中和来改变光学活性色氨酸的冷冻方法,使光学活性色氨酸结晶化 含有杂质的色氨酸,其通过将碱或酸的一部分与已经除去杂质的酸性或碱性光学活性色氨酸水溶液的部分组合而抑制光学活性色氨酸的絮凝和结晶,用碱或酸, 从而中和含有光学活性色氨酸的水溶液,使得待结晶的溶液的pH保持在3至8的范围内,同时使旋光色氨酸作为絮凝晶体结晶。