过氧亚硝酸盐
化学
安培法
检出限
过氧亚硝酸
选择性
超氧化物
体内
催化作用
生物物理学
色谱法
生物化学
电化学
电极
酶
生物技术
物理化学
生物
作者
Jian Xue,Xiangyang Ying,Junshui Chen,and Yuezhong Xian,Litong Jin,Jiye Jin
摘要
The research studied the concentration variation of peroxynitrite anion (ON−O−O-) released from cultured neonatal myocardial cells induced by ischemia/reperfusion and studied the protective effect of melatonin on the injury. For this purpose, amperometry peroxynitrite ultramicrosensors (UMS) were fabricated and constructed by electropolymerizing inorganic macromolecular film of tetraaminophthalocyanine manganese(II) and coating chemically with poly(4-vinylpyridine). Under optimum conditions, the UMS showed high selectivity and sensitivity to peroxynitrite determination with a calculated detection limit of 1.8 × 10-8 mol/L (S/N of 3). The detection of peroxynitrite was based on electrocatalytic reduction of peroxynitrite. The mechanism of catalysis was also discussed. The UMS should be promising for in vivo measurement of peroxynitrite without interference or fouling. Peroxynitrite released from myocardial cells both in the ischemic period and in the reperfusion period was measured directly. This approach may lead to important information for myocardial cells on the mechanism of injury and prospective treatments of medicine such as melatonin.
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