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Screen-printed amperometric biosensors for the rapid measurement of L- and D-amino acids
P SARKAR, I E TOTHILL, S J SETFORD, A P F TURNER
Published in -
1999
Volume: 124
   
Issue: 6
Pages: 865 - 870
Abstract
Screen-printed three-electrode amperometric sensors incorporating L- and/or D-amino acid oxidase for the general purpose measurement of L- or D-amino acids is described. The working electrode incorporates rhodinised carbon, to facilitate hydrogen peroxide oxidation at a decreased operating potential, and immobilised enzyme. The devices responded to all 20 common L-amino acids and all of the D-amino acids examined, the exceptions being L- and D-proline. Linear response profiles were observed for L-leucine, L-glycine and L-phenylalanine with limits of detection of 0.47, 0.15 and 0.20 mM respectively. The devices were reproducible and exhibited stability over a 56 d test period. The biosensor compares favourably with a standard photometric amino acid test and was used to monitor milk ageing effects. The assay is cheap, simple to perform and rapid, requiring only buffer-electrolyte and a small sample volume.
About the journal
JournalAnalyst
Publisher-
ISSN0003-2654