Nonenzymatic determination of glucose at near neutral pH values based on the use of nafion and platinum black coated microneedle electrode array
- Authors
- Chinnadayyala, Somasekhar R.; Park, Ilhwan; Cho, Sungbo
- Issue Date
- May-2018
- Publisher
- SPRINGER WIEN
- Keywords
- Chloroplatinic acid hexahydrate; Lead acetate; Parylene; Polydimethylsiloxane; Electrochemical sensor; Scanning electron microscope; Chronoamperometry; Cyclic voltammetry; Electrodeposition
- Citation
- MICROCHIMICA ACTA, v.185, no.5
- Journal Title
- MICROCHIMICA ACTA
- Volume
- 185
- Number
- 5
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/3827
- DOI
- 10.1007/s00604-018-2770-1
- ISSN
- 0026-3672
- Abstract
- The authors report on a microneedle-based amperometric nonenzymatic glucose sensor for painless and continuous monitoring of glucose. It consists of 3 x 5 sharp stainless steel microneedles micromachined from a stainless steel substrate. The microneedles are 600 and 100 mu m in height and width, respectively. Nafion and platinum black were sequentially coated onto the tip of gold-coated microneedles and used for nonenzymatic (direct) sensing of glucose. Attractive features of the modified microneedle electrode include (a) a low working potential (+0.12 V vs. Ag/AgCl), (b) a linear response in the physiologically relevant range (1-40 mM), (c) a sensitivity as high as 175 mu A mM(-1) cm(-2), (d) a 23 mu M detection limit, and (e) a response time of 2 s. The sensor also exhibits good reproducibility and stability. The sensor is selective for glucose even in the presence of 10-fold higher concentrations of ascorbic acid, lactic acid, dopamine, uric acid, and acetaminophen.
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