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Fabrication of a Novel Hydrogen Peroxide Biosensor Based on [email protected] Composite

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A promising hydrogen peroxide (H2O2) biosensor was fabricated by the immobilization of hemoglobin (Hb) on [email protected] composite surface. The composite with carbon spheres and gold shell ([email protected]) was synthesized via the seed-growth assembly technique. The assembly of the gold shell on carbon sphere surfaces was characterized by scanning electron miscroscopy (SEM). Owing to the unique structure and large surface area of the gold shell, the composite offered an effective interface for the immobilization of hemoglobin to fabricate a H2O2 biosensor. The obtained biosensor showed a wide linear range from 5.0 μM to 135 μM with a detection limit of 1.67 μM at 3σ, and the apparent Michaelis-Menten constant (K m app) of the immobilized Hb was calculated to be 88.6 μM. Moreover, the biosensor also exhibited good reproducibility and long-term stability. Therefore, this kind of composite can provide an ideal matrix for protein immobilization and biosensor fabrication.
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Keywords: BIOSENSOR; C COMMAT AU; DIRECT ELECTRON TRANSFER; HEMOGLOBIN

Document Type: Research Article

Publication date: 2011-01-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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