The enzyme alanine aminotransferase (ALT) is colorimetrically determined as the hydrogen peroxide obtained in the pyruvate hydrolysis reaction catalysed by the enzyme pyruvate oxidase which develops a colour read at 550 nm making use of a reagent composition buffered at pH comprised within 7.0 and 7.5 containing L-alanine, ketoglutaric acid, a source of inorganic phosphorous, the enzyme pyruvate oxidase, a system for revealing the hydrogen peroxide and optionally one or more co-factors which interact in the enzymatic reaction catalysed by the enzyme pyruvate oxidase. It is moreover described a method for the determination of the enzyme alanine aminotransferase making use of said reagent composition and of the surface antigen of the hepatitis B virus (HBsAg), by enzymeimmune assay, in the same serum specimen and in the same well of a microtitration plate. The method is particularly useful for checking the suitability of the blood intended for transfusions since it can be easily carried out with equipments and instruments widely used for the immunoenzymatic screening of infectivity. Furthermore it enables to test in the same analytical assay the two labels of hepatocyte infections necessarily researched in the transfusion centres on biological specimens and to select among the donors the most likely candidates to transmission of the NANB hepatitis virus.
丙
氨酸
氨基转移酶(ALT)是通过
丙酮酸氧化酶催化的
丙酮酸水解反应中产生的
过氧化氢进行比色测定的,
过氧化氢在 550 纳米波长处显色。该方法利用 pH 值在 7.0 和 7.5 之间的缓冲试剂组合物,其中含有
L-丙氨酸、酮
戊二酸、无机
磷源、
丙酮酸氧化酶、
过氧化氢显现系统以及在
丙酮酸氧化酶催化的酶促反应中相互作用的一种或多种辅助因子。此外,还描述了一种测定丙
氨酸
氨基转移酶的方法,该方法利用所述试剂组合物和乙型肝炎病毒表面抗原(HBsAg),通过酶免疫测定法,在同一血清标本中和微量滴定板的同一孔中进行测定。这种方法特别适用于检查输血血液的适用性,因为它可以使用广泛用于感染性免疫酶筛查的设备和仪器轻松完成。此外,它还能在同一分析测定中检测输血中心必须对
生物标本进行研究的两种肝细胞感染标签,并从献血者中筛选出最有可能传播 NANB 肝炎病毒的人。