Abstract
A portable capacitive sensor was designed to assess frying oil degradation by measuring the changes in electrical capacitance. An interdigital electrode (IDE) was designed to be implemented as the testing probe (as IDEs are resistive to parasitic capacitance), together with an adjacent capacitive chip Pcap01 and a further microprocessor STM32, which were used as the data-processing elements. Experimental results demonstrated that viscosity could be a useful frying oil quality indicator, and also proved a preliminary correlation between IDE capacitance and oils’ total polar materials. This implies that IDE capacitance could be a suitable metric for conveniently assessing frying oil degradation. The designed capacitance sensor is light in weight, cost effective, and has excellent potential for simple, inexpensive, on-the-spot testing of the current quality of frying oil.
Highlights
A series of physical and chemical changes occurs in frying oil at high temperatures, including polymerization, oxidation and hydrolysis [1]
As the frying time lengthened, the oil total polar materials (TPM) appeared to increase consistently, as did its viscosity, viscosity, as suggested in Figure 3, and the viscosity was nearly linearly correlated with TPM, in as suggested in Figure 3, and the viscosity was nearly linearly correlated with TPM, in accordance accordance with the results of previous researchers [10,11,12,13,14]
The capacitance measurement data were analyzed analyzed to evaluate the degradation of frying oil
Summary
A series of physical and chemical changes occurs in frying oil at high temperatures, including polymerization, oxidation and hydrolysis [1]. When testing the quality of frying oil, the measurement of total polar materials (TPM), provides the metric usually considered the most accurate since it includes critical information about the overall chemical degradation taking place in the oil. Through extensive use of these devices over time, a significant correlation between the dielectric constant and TPM in oil [4,5,6,7,8,9] has been established. These commercial devices have not been widely accepted, mostly because of their costly nature
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
