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采用示差脉冲伏安法,在乳酸脱氢酶(LDH)酶促体系“丙酮酸盐 + NADH +H+ (?) 乳酸盐 + NAD+”中,通过检测NAD+还原峰电流的变化,测定了不同条件下(不同酶用量、缓冲液pH值以及温度)LDH的活性、酶促体系的米氏常数KmNADH以及最大反应速率vmax。并且在最佳实验条件下,通过检测LDH活性的改变,实验考察了3种纳米物质(ZnS,TiO2(R)和TiO2(A))对乳酸脱氢酶酶促体系的影响。 相似文献
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The intramolecularly bridged alkyl cobaltic complexes are one of important coenzyme B12 model coplexes. In this paper, study on the thermolytic reaction of aqua(3-bromopropyl)cobaloximes in solution revealed that a new intramolecularly bridged alkyl cobaloximes complex was formed and the reaction is influenced by tempertature and solvent. Adding cyclodxtrin has no obvious effect to the rate of the reaction, but various products with different axial bases were obtained. The intramolecularly bridged alkyl cobaloxime complex (bromo(O-trimethylene-dimethy- lglyoxime)(dimethylglyoximate)cobalt(Ⅲ)) was characterized by EA and ESI-MS. Thermogravimetric analysis of this complex found that a carbon radical that from homolysis of the Co-C bond is retained in the proximity of CoⅡ- complex, which is very similar to the behavior of coenzyme B12. 相似文献
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研究了酸性、中性、碱性范嗣内丙酮酸在悬汞电极上的电化学行为.对实验条件进行了优化.在最佳条件下丙酮酸的还原峰电流和浓度有良好的线性关系。同时在不同pH值条件下研究了AI(Ⅲ)和丙酮酸的相互作用,结果表明,不同pH值范围内AI(Ⅲ)和丙酮酸的相互作用均为弱作用,弱作用强度为酸性〉碱性〉中性。这种作用强度的差别可能来自于不同条件下AI(Ⅲ)的存在形态不同. 相似文献
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