Enzymatic synthesis of specifically <sup>2</sup>
H-labelled L-glutamic acids and <sup>2</sup>
H-, <sup>15</sup>
N-, <sup>13</sup>
C-labelled L-glutamines on a preparative scale
作者:A. Ogrel、I. A. Vasilenko、J. Lugtenburg、J. Raap
DOI:10.1002/recl.19941130706
日期:——
conversion of 2-oxoglutaric acid using glutamate dehydrogenase (GDH, E.C. 1.4.1.3.), alcohol dehydrogenase (ADH, E.C. 1.1.1.1.) and (2H6)ethanol. (3,3-2H2)-L-Glutamic acid was prepared by enzymatic conversion of 2-oxo-3,3-di-deuteroglutaric acid which was easily obtained from 2-oxoglutaric acid by an isotope exchange reaction in 2H2O at pH 13.0. (4,4-2H2)-L-Glutamic acid was obtained by chemical exchange
在本文中,我们以克为单位报告了2 H-标记的L-谷氨酸和2 H-,15 N-,13 C-标记的L-谷氨酰胺的制备方法。获得的产物具有高同位素富集度(> 98%)和高光学纯度。合成方案允许每个H,C和N位置或任何位置组合的特定同位素富集。(2- 2 H)-L-谷氨酸是通过使用谷氨酸脱氢酶(GDH,EC 1.4.1.3。),醇脱氢酶(ADH,EC 1.1.1.1。)和(2 H 6)乙醇。(3,3- 2 ħ 2通过将2-氧代戊二酸在2 H 2 O中于pH 13.0进行同位素交换反应而容易地制得2-氧代-3,3-二-氘代戊二酸来制备)-L-谷氨酸。通过在20%2 HCl中的化学交换获得(4,4- 2 H 2)-L-谷氨酸。L-谷氨酰胺[(2- 2 H)-,(3,3- 2 H 2)-,(4,4- 2 H 2)-和(5- 13 C)-L-Gln]的四种不同的异构体通过使用谷氨酰胺合成酶(GS,EC 6