Quality assessment of deep-frying palm oil by impedimetric sensing with a simple and economic electrochemical cell
Journal
Sensors
Journal Volume
21
Journal Issue
21
Date Issued
2021
Author(s)
Kung Y
Abstract
Quality control of deep-frying oil is a global public health concern. A simple and economic electrochemical chamber composed of two bare screen-printed carbon electrodes (working area: 78.54 × 102 cm2; distance: 0.0055 cm; cell constant: 0.70 × 10?2 cm?1) was constructed for precisely acquiring the impedimetric responses of a high-resistance palm oil sample (RSD < 7%, n = 3). Good correlations between the measured impedance data (charge transfer resistance and logarithmic out-put impedance (Log Z) obtained in the frequency region <0.1 Hz) and the regulatory quality indicators (total polar compounds and acid value) were achieved (R2 > 0.97), suggesting that the proposed impedimetric sensing method is useful for accurately assessing the deteriorated condition of repeated frying oil. Applications for rapid screening can also be realized because the measurement times of Log Z at any given perturbation frequency from 0.01–1 Hz were all less than 3 min. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Subjects
Acid value
Cell constant
Screen-printed carbon electrode
Total polar compounds
Viscosity
Charge transfer
Electrochemical electrodes
Deep frying
Frying oil
Global public health
Polar compounds
Quality assessment
Screen-printed carbon electrodes
Simple++
Total polar compound
Palm oil
palm oil
cooking
electrode
heat
Cooking
Electrodes
Hot Temperature
Palm Oil
SDGs
Type
journal article