Investigation of organic phase biosensor for measuring glucose in flow injection analysis system

N. Adányi, M. Tóth-Markus, E. E. Szabó, M. Váradi, M. P. Sammartino, M. Tomassetti, L. Campanella

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The aim of our present work was to develop a flow-through measuring apparatus for the determination of glucose content as model system in organic media and to compare the properties of the biosensor in organic and in aqueous solutions. Glucose oxidase (GOx) enzyme was immobilized on a natural protein membrane in a thin-layer enzyme cell, made of Teflon. The enzyme cell was connected into a flow injection analyzer (FIA) system with an amperometric detector. After optimizing the system the optimal flow rate was found at 0.8mlmin-1. In this case 50-60 samples were measured per hour. Adding ferrocene monocarboxylic acid (FMCA) to acetonitrile and to 2-propanol the optimal concentration was 5mgl-1, while in the case of tetrabutylammonium-p-toluenesulfonate (TBATS) the optima were 2.7 and 8.0mgl-1, respectively. With 6% buffer in acetonitrile containing FMCA more than 100 samples could be measured with the enzyme cell without any loss of activity. Measuring the hydrogen peroxide content produced in 2-propanol, the optimal concentration of buffer solution was at about 20%. The linear measuring range was 0-0.5mM glucose in acetonitrile and 0-1.0mM in 2-propanol. Glucose concentration of oily food samples was measured and compared with results obtained by the reference UV-photometric method. The correlation between the results measured by the two methods was very good with correlation coefficient (r) as high as 0.976.

Original languageEnglish
Pages (from-to)219-225
Number of pages7
JournalAnalytica Chimica Acta
Volume501
Issue number2
DOIs
Publication statusPublished - Jan 16 2004

Fingerprint

Flow Injection Analysis
2-Propanol
Biosensing Techniques
systems analysis
Biosensors
glucose
enzyme
Glucose
Buffers
Enzymes
Immobilized Enzymes
Glucose Oxidase
Acids
Polytetrafluoroethylene
Hydrogen Peroxide
acid
Membrane Proteins
hydrogen peroxide
Food
Injections

Keywords

  • Amperometric detection
  • FIA system
  • Glucose measurement
  • Glucose oxidase
  • Organic phase biosensor

ASJC Scopus subject areas

  • Biochemistry
  • Analytical Chemistry
  • Spectroscopy
  • Environmental Chemistry

Cite this

Investigation of organic phase biosensor for measuring glucose in flow injection analysis system. / Adányi, N.; Tóth-Markus, M.; Szabó, E. E.; Váradi, M.; Sammartino, M. P.; Tomassetti, M.; Campanella, L.

In: Analytica Chimica Acta, Vol. 501, No. 2, 16.01.2004, p. 219-225.

Research output: Contribution to journalArticle

Adányi, N. ; Tóth-Markus, M. ; Szabó, E. E. ; Váradi, M. ; Sammartino, M. P. ; Tomassetti, M. ; Campanella, L. / Investigation of organic phase biosensor for measuring glucose in flow injection analysis system. In: Analytica Chimica Acta. 2004 ; Vol. 501, No. 2. pp. 219-225.
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