Synthesis and<i>in vitro</i>Enzyme Hydrolysis of Trioxadiaza- and Tetraoxadiaza-Crown Ether-Based Complexing Agents with Disposable Ester Pendant Arms
作者:István Lázár、Tímea Iványi
DOI:10.1055/s-2005-918442
日期:——
New disposable ester derivatives of the complexing agents N,N′-bis(carboxymethyl)piperazine, -homopiperazine, -1,7-diaza-15-crown-5 and -1,10-diaza-18-crown-6 were synthesized with a variety of synthetic methods and fully characterized. Hydrolytic properties of the pendant arms were studied under different pH conditions as well as in the presence and absence of porcine liver esterase enzyme and approximate hydrolysis half lives were determined by 1H NMR technique. In vitro studies on pig liver cell homogenates and living thin chicken liver slices proved that the selected double ester 4b can penetrate liver tissues spontaneously, liberate the free complexing agent N,N′-bis(carboxymethyl)-18-ane-N2O4 (ODDA) inside the cells and are potentially capable of removing lead and other toxic metal ions from the liver.
新的一次性酯类衍生物,包括络合剂N,N′-双(羧甲基)哌嗪、-高哌嗪、-1,7-二氮杂-15-冠-5和-1,10-二氮杂-18-冠-6,通过多种合成方法制备并进行了全面表征。研究了在不同pH条件下以及在存在和不存在猪肝酯酶酶的情况下悬垂臂的水解特性,并通过1H NMR技术确定了近似的水解半衰期。对猪肝细胞匀浆和活体鸡肝薄片的体外研究表明,所选的双酯4b能够自发渗透肝组织,在细胞内部释放自由络合剂N,N′-双(羧甲基)-18-氮杂-N2O4(ODDA),并可能具有从肝脏中去除铅和其他有毒金属离子的能力。