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Electrochemical Determination of Protease with Improving Sensitivity by Electrochemical-chemical-chemical Redox Cycling

机译:电化学-化学-化学氧化还原循环电化学法测定蛋白酶的敏感性

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Redox-labeled peptides attached on the electrode surface have allowed for the determination of variousproteases. Herein, we reported a simple method to improve the sensitivity of redox-labeledelectrochemical protease biosensors by employing an electrochemical-chemical-chemical redoxcycling. Specifically, ferrocene (Fc) conjugated to the peptide substrate immobilized onto the electrode+ +surface was oxidized into ferrocenium (Fc ); then, Fc was regenerated from Fc by ascorbic acid. Inthe presence of tris(2-carboxyethyl)phosphine (TCEP), ascorbic acid was also regenerated immediatelyafter its oxidation, therefore resulting in the further increase in the oxidation current. To demonstratethe feasibility of this amplified strategy, thrombin was tested as a model analyte.
机译:附着在电极表面的氧化还原标记的肽可用于测定各种蛋白酶。在这里,我们报告了一种简单的方法,可以通过采用电化学-化学-化学氧化还原循环来提高氧化还原标记的电化学蛋白酶生物传感器的灵敏度。具体地,将与固定在电极+表面上的肽底物缀合的二茂铁(Fc)氧化为二茂铁(Fc)。然后,通过抗坏血酸从Fc再生Fc。在三(2-羧乙基)膦(TCEP)的存在下,抗坏血酸氧化后也立即再生,因此导致氧化电流进一步增加。为了证明这种放大策略的可行性,将凝血酶作为模型分析物进行了测试。

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