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Vol. 34 No. 8 (2022): Vol 34 Issue 8, 2022

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pH Measurement of Mixed Saliva using a Flow-injection Sensor with a Tubular Carbon Electrode

https://doi.org/10.14233/ajchem.2022.23839
S. Aronbaev
Samarkand State University, 15 University Boulevard, Samarkand, Uzbekistan
Ch. Raimkulova
Samarkand Medical Institute, 18 Amir Temur Street, Samarkand, Uzbekistan
D. Isakova
Samarkand Medical Institute, 18 Amir Temur Street, Samarkand, Uzbekistan
F. Berdymuradova
Samarkand Medical Institute, 18 Amir Temur Street, Samarkand, Uzbekistan
D. Aronbaev
Samarkand State University, 15 University Boulevard, Samarkand, Uzbekistan

Corresponding Author(s) : D. Aronbaev

diron51@mail.ru

Asian Journal of Chemistry, Vol. 34 No. 8 (2022): Vol 34 Issue 8, 2022

Abstract

Present work discusses the design of a flow-injection sensor for measuring pH in micro-volumes of the sample. A carbon electrode with a capillary channel was used as a working electrode, through which an electrolyte solution saturated with quinhydrone flows at a constant speed. The volume of the analyzed sample was 0.1-0.2 mL. Compliance with the Nernst pH function with a slope of 53.1 ± 1.1 mV/pH was observed in the range of 1.0-7.5 pH. The sensor has been tested in the non-invasive diagnostics of acid-base balance of the oral fluid. The analysis of mixed saliva was carried out in 30 practically healthy student volunteers with an intact row of teeth. The median pH value of 7.03 was established, which corresponds to the physiological norm. At the same time, there is a predisposition to caries in almost half of the subjects, since a high risk is determined in the formation of focal demineralization of tooth enamel with the appearance of erosion of hard tooth tissues.

Keywords

Non-invasive diagnostics Mixed saliva pH determination Flow-injection sensor Quinhydrone electrode
Aronbaev, S., Raimkulova, C., Isakova, D., Berdymuradova, F., & Aronbaev, D. (2022). pH Measurement of Mixed Saliva using a Flow-injection Sensor with a Tubular Carbon Electrode. Asian Journal of Chemistry, 34(8), 2081–2085. https://doi.org/10.14233/ajchem.2022.23839
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