Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/7793
Title: A new, improved sensor for ascorbate determination at copper hexacyanoferrate modified carbon film electrodes
Authors: Pauliukaite, Rasa 
Ghica, Mariana Emilia 
Brett, Christopher M. A. 
Issue Date: 2005
Citation: Analytical and Bioanalytical Chemistry. 381:4 (2005) 972-978
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.
URI: http://hdl.handle.net/10316/7793
DOI: 10.1007/s00216-004-2958-6
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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