Potentiometric urea biosensor based on an immobilised fullerene-urease bio-conjugate

Kasra Saeedfar, Yook Heng Lee, Ling Ling Tan @ Chong, Majid Rezayi

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

A novel method for the rapid modification of fullerene for subsequent enzyme attachment to create a potentiometric biosensor is presented. Urease was immobilized onto the modified fullerene nanomaterial. The modified fullerene-immobilized urease (C60-urease) bioconjugate has been confirmed to catalyze the hydrolysis of urea in solution. The biomaterial was then deposited on a screen-printed electrode containing a non-plasticized poly(n-butyl acrylate) (PnBA) membrane entrapped with a hydrogen ionophore. This pH-selective membrane is intended to function as a potentiometric urea biosensor with the deposition of C60-urease on the PnBA membrane. Various parameters for fullerene modification and urease immobilization were investigated. The optimal pH and concentration of the phosphate buffer for the urea biosensor were 7.0 and 0.5 mM, respectively. The linear response range of the biosensor was from 2.31 × 10-3 M to 8.28 × 10-5 M. The biosensor's sensitivity was 59.67 ± 0.91 mV/decade, which is close to the theoretical value. Common cations such as Na+, K+, Ca2+, Mg2+ and NH4 + showed no obvious interference with the urea biosensor's response. The use of a fullerene-urease bio-conjugate and an acrylic membrane with good adhesion prevented the leaching of urease enzyme and thus increased the stability of the urea biosensor for up to 140 days.

Original languageEnglish
Pages (from-to)16851-16866
Number of pages16
JournalSensors (Switzerland)
Volume13
Issue number12
DOIs
Publication statusPublished - 6 Dec 2013

Fingerprint

Fullerenes
Urease
Biosensing Techniques
ureas
bioinstrumentation
Biosensors
Urea
fullerenes
membranes
Membranes
acrylates
enzymes
Enzymes
Ionophores
Nanostructures
Biocompatible Materials
leaching
immobilization
Nanostructured materials
Biomaterials

Keywords

  • Fullerene
  • Potentiometric
  • Urea biosensor
  • Urease

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Biochemistry

Cite this

Potentiometric urea biosensor based on an immobilised fullerene-urease bio-conjugate. / Saeedfar, Kasra; Lee, Yook Heng; Tan @ Chong, Ling Ling; Rezayi, Majid.

In: Sensors (Switzerland), Vol. 13, No. 12, 06.12.2013, p. 16851-16866.

Research output: Contribution to journalArticle

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