A glycine/(NH4)2SO4mixture was isolated by treatment of glyoxylic acid with FeSO4and aqNH3in H2O. The yields of glycine were estimated by1H NMR. Pyruvic acid was not reduced to alanine under these conditions. This method for forming glycine might have occurred prebiotically alongside the Urey-Miller arc discharge method for making amino acids because glyoxylic acid is formed by arc discharge through a N2/CO2atmosphere and both NH3and Fe(II) occurred in the earth's early oceans. The carboxylic acid directs the reduction of 2,4-dinitrobenzoic acid to give 2-amino-4-nitrobenzoic acid.
通过在 H2O 中用 FeSO4 和 aqNH3 处理乙醛酸,分离出甘氨酸/(NH4)2SO4 混合物。通过 1H NMR 对甘氨酸的产量进行了估算。在这些条件下,丙酮酸没有被还原成丙氨酸。这种生成甘氨酸的方法可能与乌雷-米勒电弧放电法生成氨基酸的方法同时出现在生物学之前,因为乙醛酸是通过 N2/CO2 大气中的电弧放电形成的,而 NH3 和 Fe(II)都出现在地球早期的海洋中。羧酸引导 2,4-二硝基苯甲酸还原,生成 2-氨基-4-硝基苯甲酸。