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Electrochemical characterization of a superoxide biosensor based on the co-immobilization of cytochromecand XOD on SAM-modified gold electrodes and application to garlic samples

Authors
Journal
Talanta
0039-9140
Publisher
Elsevier
Publication Date
Volume
79
Issue
2
Identifiers
DOI: 10.1016/j.talanta.2009.03.046
Keywords
  • Impedance Spectroscopy
  • Amperometry
  • Cytochromec-Based Biosensor
  • Antioxidant Capacity
  • Screen-Printed Gold Electrodes
Disciplines
  • Biology
  • Chemistry

Abstract

Abstract This paper describes the characterization and optimization of an amperometric cytochrome c (cyt c)-based sensor for the determination of the antioxidant capacity of pure substances and natural samples. The cyt c and the xanthine oxidase (XOD) enzyme were co-immobilized on the electrode using the combination of several long-chain thiols. The self-assembled monolayer (SAM) was optimized in terms of composition and ratio between thiols. The immobilization protocol for both cyt c and XOD and the SAM formation time were evaluated through electrochemical methods, such as cyclic voltammetry (CV), square wave voltammetry (SWV), chronoamperometry (CA) and impedance spectroscopy (IS). Finally, the biosensor was applied to the determination of the antioxidant capacity of pure alliin and two compounds extracted from garlic bulbs.

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