Abstract
Nanostructured nickel oxide (NiO) thin film has been explored as a matrix to develop a reagentless biosensor for free and total cholesterol as well as low density lipoprotein (LDL) detection. The redox property of the matrix has been exploited to enhance the electron transfer between the enzyme and the electrode as well as to eliminate the toxic mediator in solution. X-ray diffraction, scanning electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy were carried out to characterize the NiO thin film. Biosensing response studies were accomplished using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). The developed biosensors exhibited a high sensitivity of 27 and 63 μA/mM/cm2 over a linear range of 0.12–10.23 and 1–12 mM, respectively, for free and total cholesterol. Reagentless estimation of LDL was also achieved over the wide range 0.018–0.5 μM with a sensitivity of 0.12 mA/μM/cm2. The results are extremely promising for the realization of an integrated biosensor for complete detection of cholesterol in the serum samples.
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Acknowledgements
The authors are grateful to the Department of Science and Technology (DST), Ministry of Science and Technology for the financial support. GK gratefully acknowledges the University Grants Commission (UGC) for research fellowship.
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Kaur, G., Tomar, M. & Gupta, V. Nanostructured NiO-based reagentless biosensor for total cholesterol and low density lipoprotein detection. Anal Bioanal Chem 409, 1995–2005 (2017). https://doi.org/10.1007/s00216-016-0147-z
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DOI: https://doi.org/10.1007/s00216-016-0147-z