TITLE

A new, improved sensor for ascorbate determination at copper hexacyanoferrate modified carbon film electrodes

AUTHOR(S)
Pauliukaite, Rasa; Ghica, Mariana Emilia; Brett, Christopher M. A.
PUB. DATE
February 2005
SOURCE
Analytical & Bioanalytical Chemistry;Feb2005, Vol. 381 Issue 4, p972
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new, improved sensor for the electrocatalytic determination of ascorbate has been developed that has both a low applied operating potential and a low detection limit. The sensor was constructed by depositing copper hexacyanoferrate film either electrochemically or chemically onto carbon film electrode, and it was then characterised by cyclic voltammetry and electrochemical impedance spectroscopy. Chemically deposited films were shown to be the best for ascorbate determination and were used as an amperometric sensor at +0.05 V versus SCE to determine ascorbate in wines and juice. The linear range extended to 5 mM with a limit of detection of 2.1 µM, the sensor was stable for more than four months, and it could be used continuously for at least 20 days.
ACCESSION #
16312054

 

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