Electrode and electrodeless impedance measurement for determination of orange juices parameters

Abstract

Electrical impedance spectroscopy (EIS) is a non-destructive, rapid and real-time measurement method which does not require special high-tech measurement devices and can be applied to food quality assessment. This method is rapid, effective and affords low-cost investigation of the product. The conventional EIS method requires a set of metal electrodes in direct contact with the medium to be measured. The complicated electrochemical processes on the electrodes-electrolyte interface could substantially affect the value of the impedance measured. The present study sought to explore the possibilities of using the impedance method for quality control in orange juices, to introduce the electrodeless method of electrolyte impedance measurement and to compare this with the conventional impedance methods. The electrical properties of the orange juices were described with the help of an equivalent circuit. An equivalent circuit was designed with constant phase element approximation. The values of the equivalent circuit components were fitted using a non-standard algorithm inspired by the behaviour of actual ant colonies. Implementing the electrodeless method obviated the electrodes phenomena effects and the behaviour of the electrolyte is similar to inductance. The proposed electrodeless method is generally applicable to measuring the electrochemical properties of electrolytes.

Mathematical correlations between selected quality attributes and electrical parameters of apple juice

“…The feasibility of predicting concentrations of ethanol and organic acid in complex solutions based on impedance measurements was also demonstrated by Zheng () who used electrical impedance spectroscopy to investigate changes in the electrical properties of the major components of grape must during fermentation. The usefulness of impedance measurements has also been demonstrated for detecting artificial chemical additives in liquid food products (Nakonieczna et al, ), and to measuring the electrochemical properties of orange juice by electrical impedance spectroscopy (Seidlová et al, ).…”

On-chip detection and quantification of soap as an adulterant in milk employing electrical impedance spectroscopy

“…It is also being exploited to investigate the different structures of organic and inorganic materials over a wide and continuous range of frequencies [207]. EIS is also a useful tool for detecting artificial chemical additives/adulterants in beverages [21], fruit juices [208], dairy products [209][210][211], in determining the floral origin and electrical properties of honey [142,143] in examining specific biological tissues [22,173] and detecting pathogens [126,212,213].…”