Abstract
We report a simple method for the direct and quantitative determination of dihydronicotinamide adenine dinucleotide (NADH) using a single-walled carbon nanohorn (SWCNH) modified glassy carbon electrode (GCE). The electrochemically activated SWCNH modified GCE (SWCNH/GCE) substantially lowers the overpotential necessary for NADH oxidation compared to the inactivated SWCNH/GCE or bare GCE. We observe a 89-mV shift in the peak potential of NADH from GCE to SWCNH/GCE and another 101-mV shift from inactivated SWCNH/GCE to activated SWCNH/GCE in phosphate buffer (pH 7.0) at a scan rate of 50 mV/s. The activated SWCNH/GCE shows a linear response toward NADH between 1 and 100 μM with the detection limit of 0.2 μM. The activated SWCNH/GCE displays good reproducibility, high sensitivity, and excellent stability. Furthermore, the fabricated electrochemical sensors were used to detect NADH in serum by standard addition method and the recoveries are satisfactory.
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Acknowledgments
The authors are grateful to Professor S. Iijima (Solution Oriented Research for Science and Technology in Japan Science and Technology Agency) for generous offer of SWCNHs. This work is kindly supported by the National Natural Science Foundations of China (No. 21405094, No. 81303179, No. 21475074), by the Natural Science Foundation of Shandong Province (No. ZR2013BQ018), the Open Funds of the State Key Laboratory of Electroanalytical Chemistry (No. SKLEAC201506), the Scientific Research Foundation of Qufu Normal University (No. xkj201301, No. bsqd2012023), and the Taishan Scholar Foundation of Shandong Province, China.
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Zhu, S., Zhao, Xe., Chen, G. et al. Electrochemical behavior and voltammetric determination of dihydronicotinamide adenine dinucleotide using a glassy carbon electrode modified with single-walled carbon nanohorns. Ionics 21, 2911–2917 (2015). https://doi.org/10.1007/s11581-015-1472-5
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DOI: https://doi.org/10.1007/s11581-015-1472-5