优化葡萄糖氧化酶和锇基氧化还原聚合物在金电极上增强葡萄糖传感

IF 3.2 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Xue Wang, Keerthi Booshan Manikandan, Hyug-Han Kim, Chang-Joon Kim
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引用次数: 0

摘要

基于葡萄糖氧化酶(GOx)的电极在葡萄糖传感和植入式设备的潜在电源方面有很好的应用前景,但它们的性能仍然严重依赖于有效的电子转移和酶固定策略。本研究以聚乙二醇二甘油酯醚(PEGDGE)为交联剂,系统地研究了GOx与氧化还原活性聚合物聚(n-乙烯基咪唑)-[Os(4,4′-二甲基-2,2′-联吡啶)2Cl])+/2+ (PVI-Os-dme)的共固定化,以提高电极的催化性能和电子转移性能。通过改变酶与介质的比例并采用逐层组装方法,我们证明了负载量和组成对电流的产生、电荷转移电阻和整体电极效率都有重要影响。虽然电流输出随着层数的增加而增加,但单位质量酶或介质的催化活性降低,这表明在高负荷下存在权衡。优化后的电极由6层复合材料(每层2 μg GOx、3.6 μg PVI-Os-dme、2.2 μg PEGDGE)组成,在0.3 V下可获得23.7±1.7 μA的峰值电流,循环3次和5次可分别保留85%和57%的初始电流,具有良好的可重复使用性。动力学分析表明,该电极的表观Michaelis-Menten常数(Kmapp)为9.0 mM,最大电流(Imax)为29.2 μA,证实了该电极对葡萄糖的高亲和力和催化效率。这些结果强调了优化GOx/PVI-Os-dme负载、比例和层数对提高电极性能的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhanced Glucose Sensing through Optimization of Glucose Oxidase and Osmium-Based Redox Polymer on Gold Electrodes

Enhanced Glucose Sensing through Optimization of Glucose Oxidase and Osmium-Based Redox Polymer on Gold Electrodes

Glucose oxidase (GOx)-based electrodes offer promising applications in glucose sensing and as potential power sources for implantable devices, yet their performance remains critically dependent on efficient electron transfer and enzyme immobilization strategies. This study systematically investigated the co-immobilization of GOx and a redox-active osmium polymer, poly (N-vinylimidazole)-[Os(4,4′-dimethyl-2,2′-bipyridine)2Cl])+/2+ (PVI-Os-dme), using poly(ethylene glycol) diglycidyl ether (PEGDGE) as a crosslinker to enhance both the catalytic and electron-transfer properties of the electrode. By varying the enzyme-to-mediator ratio and applying a layer-by-layer assembly approach, we demonstrated that both loading quantity and composition critically influenced current generation, charge transfer resistance, and overall electrode efficiency. While current output increased with additional layers, the catalytic activity per unit mass of enzyme or mediator decreased, indicating a trade-off at high loadings. The optimized electrode, composed of six composite layers (2 μg GOx, 3.6 μg PVI-Os-dme, 2.2 μg PEGDGE per layer), achieved the highest peak current of 23.7 ± 1.7 μA at 0.3 V and retained over 85% of initial current after 3 cycles and 57% after 5 cycles, demonstrating favorable reusability. Kinetic analysis revealed an apparent Michaelis–Menten constant (Kmapp) of 9.0 mM and a maximum current (Imax) of 29.2 μA, confirming the electrode’s high affinity and catalytic efficiency toward glucose. These results highlight the importance of optimizing GOx/PVI-Os-dme loadings, ratio, and the number of layers for enhancing the electrode performance.

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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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