Graphene and tricobalt tetraoxide nanoparticles based biosensor for electrochemical glutamate sensing


DALKIRAN B., ERDEN P. E. , Kilic E.

ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY, vol.45, no.2, pp.340-348, 2017 (Peer-Reviewed Journal) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 45 Issue: 2
  • Publication Date: 2017
  • Doi Number: 10.3109/21691401.2016.1153482
  • Journal Name: ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.340-348
  • Keywords: Amperometry, biosensor, Co3O4, glutamate, graphene, AMPEROMETRIC BIOSENSOR, VOLTAMMETRIC DETECTION, MONOSODIUM GLUTAMATE, CARBON NANOTUBES, REDUCED GRAPHENE, OXIDASE, IMMOBILIZATION, ELECTRODE, DEHYDROGENASE, SYSTEM

Abstract

An amperometric biosensor based on tricobalt tetraoxide nanoparticles (Co3O4), graphene (GR), and chitosan (CS) nanocomposite modified glassy carbon electrode (GCE) for sensitive determination of glutamate was fabricated. Scanning electron microscopy was implemented to characterize morphology of the nanocomposite. The biosensor showed optimum response within 25 s at pH 7.5 and 37 degrees C, at +0.70 V. The linear working range of biosensor for glutamate was from 4.0 x10(-6) to 6.0 x 10(-4) M with a detection limit of 2.0 x10(-6) M and sensitivity of 0.73 mu A/mM or 7.37 mu A/mMcm(2). The relatively low Michaelis-Menten constant (1.09 mM) suggested enhanced enzyme affinity to glutamate. The glutamate biosensor lost 45% of its initial activity after three weeks.