作者:Clare L. Ritter、Danuta Malejka-Giganti
DOI:10.1021/tx980152w
日期:1998.11.1
derivatives by one- and two-electron reductants was examined. Rates of nitroreduction catalyzed by xanthine oxidase (XO)/hypoxanthine and measured via stimulation of acetylated cytochrome c reduction increased with the number of nitro groups and oxidation at C-9: 9-oxo-2,4,7-triNF > 9-oxo-2,7-diNF > 2,7-diNF > 9-oxo-2-NF = 2,5-diNF > 9-hydroxy-2-NF > 2-NF. Ascorbate catalyzed one-electron reduction to nitro
诱变和致癌的硝基芴对环境造成的广泛污染会危害人类健康。由于硝基还原导致许多硝基化合物的活化,因此研究了单电子和二电子还原剂对硝基芴(NF)衍生物的硝基还原。黄嘌呤氧化酶(XO)/次黄嘌呤催化并通过乙酰化细胞色素c还原的刺激测量的硝基还原速率随硝基数目和C-9处的氧化而增加:9-oxo-2,4,7-triNF> 9-oxo -2,7-diNF> 2,7-diNF> 9-氧代-2-NF = 2,5-diNF> 9-羟基-2-NF> 2-NF。抗坏血酸酯催化单电子还原为硝基阴离子自由基,该自由基与分子O2反应生成超氧化物。9-oxo-2,4,7-triNF和9-oxo-2,7-diNF的O2吸收率分别是它们的63和0.17倍,含等效浓度的呋喃西林(一种经典底物)。加入超氧化物歧化酶和过氧化氢酶后,O2大约再生了75%,表明形成了超氧化物。在XO / NADH存在下,具有典型Michaelis-Menten动力学的9-Oxo-2