An investigation on dielectric properties of major constituents of grape must using electrochemical impedance spectroscopy

Zheng, S, Fang, Q and Cosic, I 2009, 'An investigation on dielectric properties of major constituents of grape must using electrochemical impedance spectroscopy', European Food Research and Technology, vol. 229, no. 6, pp. 887-897.


Document type: Journal Article
Collection: Journal Articles

Title An investigation on dielectric properties of major constituents of grape must using electrochemical impedance spectroscopy
Author(s) Zheng, S
Fang, Q
Cosic, I
Year 2009
Journal name European Food Research and Technology
Volume number 229
Issue number 6
Start page 887
End page 897
Total pages 11
Publisher Springer
Abstract The Australian wine industry has been undergoing an unprecedented growth during the last decade in both winery establishments and export volumes. Though automated controlling processes are useful for maintaining high quality products and reducing costs, the techniques are not widely adopted by small to medium sized wineries due to their relative high initial costs. In this paper, we investigate the dielectric properties of ethanol and organic acids, two major chemical ingredients that need to be monitored during wine fermentation using electrochemical impedance spectroscopy. The relationships between solution concentrations and parameters derived from the measured impedance spectra were investigated by two methods, the Nyquist plot approach and the equivalent circuit modeling approach. The investigation was carried out for both pure solutions including ethanol, malic acid and tartaric acid, the major constituents of grape must, and their various mixed compound solutions to simulate the grape must under fermentation. Strong linear as well as inverse-squared relations were found between the concentrations of the pure solutions and the derived dielectric parameters, e.g., the diameter of the Nyquist plot for ethanol has a correlation with concentrations with a coefficient of determination of 0.9796 and the R s value obtained from electric circuit modeling also shows a strong inverse-squared relationship with the concentration of both malic and tartaric acids. A further investigation suggests that the individual concentration of mixed acid solutions can be handily determined by measuring the impedance of the mixed acid solutions and using the initial concentration value of one of the mixed acids. Furthermore, the dielectric properties of mixed ethanol, malic acid and tartaric acid show a combined effort from mixed acid solutions and pure ethanol.
Subject Agricultural Biotechnology Diagnostics (incl. Biosensors)
Keyword(s) Electrochemical impedance spectroscopy
Dielectric property
Grape must
Ethanol fermentatio
Constant phase element
Equivalent electrical circuit
DOI - identifier 10.1007/s00217-009-1126-9
Copyright notice © Springer-Verlag 2009
ISSN 1438-2377
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