Quality Assessment of Deep-Frying Palm Oil by Impedimetric Sensing with a Simple and Economic Electrochemical Cell
Abstract
:1. Introduction
2. Materials and Methods
2.1. Reagents, Samples, and Electrodes
2.2. Deep-Frying Process
2.3. EIS Measurement
2.4. Viscosity
2.5. Acid Value
2.6. Total Polar Compounds
3. Results and Discussion
3.1. Effect of Electrochemical Cell Geometry on Impedimetric Sensing
3.2. Effect of Deep-Frying Cycle on Impedimetric Sensing
3.3. Effect of Deep-Frying Cycle on Viscosity, AV, and TPC
3.4. Relationships between Impedimetric Data and Regulatory Quality Indicators
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Geometry | Distance (L, cm) | Area (A, cm2) | Cell Constant (cm−1) | RS (MΩ) | CD (pF) | RCT (GΩ) |
---|---|---|---|---|---|---|
#1 | 0.0385 | 19.63 × 102 | 19.61 × 10−2 | 860 ± 303 | 19.83 ± 2.89 | 165.33 ± 30.14 |
#2 | 0.0275 | 19.63 × 102 | 14.01 × 10−2 | 628 ± 177 | 22.47 ± 2.03 | 118.50 ± 17.97 |
#3 | 0.0165 | 19.63 × 102 | 8.40 × 10−2 | 687 ± 338 | 28.50 ± 1.41 | 71.83 ± 7.77 |
#4 | 0.0055 | 19.63 × 102 | 2.80 × 10−2 | 238 ± 179 | 48.87 ± 3.21 | 34.97 ± 1.43 |
#5 | 0.0055 | 78.54 × 102 | 0.70 × 10−2 | 139 ± 80 | 61.27 ± 2.64 | 10.67 ± 0.61 |
#6 | 0.0055 | 176.71 × 102 | 0.31 × 10−2 | 110 ± 46 | 79.50 ± 2.85 | 6.17 ± 0.93 |
#7 | 0.0055 | 314.16 × 102 | 0.18 × 10−2 | 55 ± 17 | 101.57 ± 5.44 | 3.95 ± 0.79 |
#8 | 0.0055 | 490.87 × 102 | 0.11 × 10−2 | 28 ± 16 | 126.67 ± 2.08 | 3.21 ± 0.87 |
Deep-Frying Time (h) | RS (MΩ) | CD (pF) | RCT (GΩ) |
---|---|---|---|
0 | 291 ± 72 | 40.47 ± 1.80 | 10.47 ± 0.49 |
4 | 318 ± 92 | 40.33 ± 1.71 | 9.81 ± 0.60 |
8 | 327 ± 60 | 41.03 ± 3.40 | 7.35 ± 0.50 |
12 | 249 ± 72 | 46.03 ± 2.31 | 6.24 ± 0.36 |
16 | 320 ± 92 | 49.20 ± 7.81 | 4.31 ± 0.29 |
20 | 259 ± 45 | 47.73 ± 3.60 | 3.51 ± 0.24 |
24 | 353 ± 52 | 48.70 ± 7.04 | 2.46 ± 0.17 |
Deep-Frying Time (h) | Viscosity (cP) | Acid Value (mg KOH/g Oil) | TPC (%) |
---|---|---|---|
0 | 55.23 ± 0.21 | 0.21 ± 0.01 | 4.67 ± 0.29 |
4 | 57.90 ± 0.36 | 0.35 ± 0.01 | 7.17 ± 0.29 |
8 | 60.57 ± 0.15 | 0.74 ± 0.02 | 11.17 ± 0.29 |
12 | 64.43 ± 0.35 | 0.90 ± 0.01 | 16.00 ± 0.50 |
16 | 68.47 ± 0.25 | 1.25 ± 0.03 | 20.50 ± 0.50 |
20 | 73.23 ± 0.25 | 1.60 ± 0.03 | 24.17 ± 0.29 |
24 | 75.80 ± 0.20 | 1.91 ± 0.03 | 26.33 ± 0.29 |
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Kung, Y.; Hsieh, B.-C. Quality Assessment of Deep-Frying Palm Oil by Impedimetric Sensing with a Simple and Economic Electrochemical Cell. Sensors 2021, 21, 7093. https://doi.org/10.3390/s21217093
Kung Y, Hsieh B-C. Quality Assessment of Deep-Frying Palm Oil by Impedimetric Sensing with a Simple and Economic Electrochemical Cell. Sensors. 2021; 21(21):7093. https://doi.org/10.3390/s21217093
Chicago/Turabian StyleKung, Yi, and Bo-Chuan Hsieh. 2021. "Quality Assessment of Deep-Frying Palm Oil by Impedimetric Sensing with a Simple and Economic Electrochemical Cell" Sensors 21, no. 21: 7093. https://doi.org/10.3390/s21217093