Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 37, Issue -, Pages 314-320Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2014.01.019
Keywords
Biosensors; Biopolymer; Horse-radish peroxidase; Artemisinin; Electrochemical impedance spectroscopy
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Funding
- Oil and Natural Gas Corporation (ONGC) of India
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The worrisome trend of antimalarial resistance has already highlighted the importance of artemisinin as a potent antimalarial agent. The current investigation aimed at fabricating a biosensor based on natural polymer polyhydroxyalkanoate-gold nanoparticle composite mounting on an indium-tin oxide glass plate for the analysis of artemisinin. The biosensor was fabricated using an adsorbing horse-radish peroxidase enzyme on the electrode surface for which cyclic voltammetry was used to monitor the electro-catalytic reduction of artemisinin under diffusion controlled conditions. Electrochemical interfacial properties and immobilization of enzyme onto a polyhydroxyalkanoate-gold nanoparticle film were evaluated, and confirmed by cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy. The differential pulse voltammetric peak current for artemisinin was increased linearly (concentration range of 0.01-0.08 mu g mL(-1)) with sensitivity of 0.26 mu A mu g mL(-1). The greater sensitivity of the fabricated biosensor to artemisinin (optimum limits of detection were 0.0035 mu g mL(-1) and 0.0036 mu g mL(-1) in bulk and spiked human serum, respectively) could be of much aid in medical diagnosis. (C) 2014 Elsevier B.V. All rights reserved.
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