甘氨酰脯氨酰对硝基苯胺对甲苯磺酸盐的合成及临床应用

目的合成甘氨酰脯氨酸二肽氨基肽酶(GPDA)的底物甘氨酰脯氨酰对硝基苯胺对甲苯磺酸盐,并探讨其临床应用。方法采用DCC-HOB t脱水合成多肽方法制备甘氨酰脯氨酰对硝基苯胺对甲苯磺酸盐;采用连续检测法测定血清GPDA的活性。结果获得高纯度底物甘氨酰脯氨酰对硝基苯胺对甲苯磺酸盐,纯度为98.5%。血清GPDA活性在358.1 U/L以下线性良好,标本批内、批间平均变异系数分别为3.01%、5.04%。应用于临床检测表明,肝癌组GPDA活性增高而胃癌组和慢性胃炎组GPDA活性则下降,与正常组比较均有显著差异(P<0.05,P<0.01)。结论所合成的底物符合临床诊断肝癌、胃癌及慢性胃炎的要求。

Synthesis of glycylproline p-nitroanilide tosylate and its clinical application

Objective To synthesize glycylproline p-nitroanilide tosylate as a substrate for glycylprolyl dipeptidyl-aminopeptidase(GPDA),and to study its clinical application.Methods The title compound was prepared by DCC-HOBt synthesis.GPDA in human serum was detected by continuous monitoring method using substrate. Results The substrate with purity of 98.5% was obtained.The linearity of the method was up to 358.1 U/L.Intraassay CV and interassay CV of GPDA in diverse serum samples were 3.01% and 5.04%,respectively.It was shown that GPDA level in patients with hepatic cancer was significantly increased,while those in patients with gastric carcinoma and chronic gastritis were significantly decreased compared with that in the control group in clinical detecting(P<0.05,P<0.01).Conclusion The synthesized substrate could be reliably used as a marker for diagnosis of liver cancer,gastric carcinoma and chronic gastritis in clinical practice.