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Amperometric micro pH measurements in oxygenated saliva

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Abstract

An amperometric micro pH sensor has been developed based on the chemical oxidation of carbon fibre surfaces (diameter of 9 μm and length of ca. 1 mm) to enhance the population of surface quinone groups for the measurement of salivary pH. The pH analysis utilises the electrochemically reversible two-electron, two-proton behaviour of surface quinone groups on the micro-wire electrodes. A Nernstian response is observed across the pH range 2–8 which is the pH range of many biological fluids. We highlight the measurement of pH in small volumes of biological fluids without the need for oxygen removal and specifically the micro pH electrode is examined by measuring the pH of commercial synthetic saliva and authentic human saliva samples. The results correspond well with those obtained by using commercial glass pH electrodes on large volume samples.

Graphical abstract: Amperometric micro pH measurements in oxygenated saliva

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Publication details

The article was received on 16 May 2017, accepted on 29 Jun 2017 and first published on 06 Jul 2017


Article type: Paper
DOI: 10.1039/C7AN00809K
Citation: Analyst, 2017, Advance Article
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    Amperometric micro pH measurements in oxygenated saliva

    K. Chaisiwamongkhol, C. Batchelor-McAuley and R. G. Compton, Analyst, 2017, Advance Article , DOI: 10.1039/C7AN00809K

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