Graphite-methacrylate biocomposite material with renewable sensing surface for reagentless amperometric biosensors based on glucose dehydrogenase

A. Morales, F. Céspedes, S. Alegret

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

A glucose biosensor based on a rigid conducting biocomposite has been prepared. The biocomposite is made of graphite powder and poly(methacrylate) incorporating the glucose dehydrogenase (GDH) and nicotinamide adenine dinucleotide phosphate (NADP+) coenzyme system. This material is prepared easily using dry-chemistry procedures allowing for the bulk immobilisation of the enzyme and the cofactor. Although the immobilisation is not very stable, the biocomposite acts as a reservoir of the biological material with a sacrificial sensing surface that may be renewed by polishing. This results in a bioelectrochemical response that is highly reproducible. The enzyme and coenzyme system is stable within the biocomposite for more than 120 days. The technique presented is a practical alternative to more conventional procedures for the fabrication of reagentless biosensors based on NAD+-dependent dehydrogenases, that imply the use of costly and sophisticated wet-chemistry procedures not compatible with mass-fabrication techniques.
Original languageEnglish
Pages (from-to)99-104
JournalMaterials Science and Engineering C
Volume7
Issue number2
DOIs
Publication statusPublished - 1 Dec 1999

Keywords

  • Glucose
  • Glucose dehydrogenase
  • Graphite-methacrylate biocomposite
  • NAD +
  • Reagentless biosensor

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