Highly Functionalized Modified Metal Oxides Polymeric Sensors for Potentiometric Determination of Letrozole in Commercial Oral Tablets and Biosamples
Abstract
:1. Introduction
2. Experimental
2.1. Chemicals
2.2. Instruments
2.3. Synthesis of Magnesium Oxide and Copper Oxide Nanoparticles
2.4. Characterization of Nanoparticles
2.5. Preparation of Standard Drug Solution
2.6. Preparation of Electroactive Complex
2.7. Membrane Composition and Sensor Fabrication
2.8. Calibration Graphs
2.9. Optimization of Potential Readings Condition
2.10. Analysis of LTZ in Femara® Tablets
2.11. Analysis of LTZ in Biosamples
2.12. Statistical Analysis
3. Results and Discussion
3.1. Characterization of MgO and CuO Nanoparticles
3.2. The Nature of the Fabricated Sensors
3.3. Quantification of Letrozole
3.4. Method Validation
3.5. Determination of LTZ in Tablets
3.6. Quantification of LTZ in Biosamples
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameter | Conventional Coated Wire LTZ-PM Sensor | Modified LTZ-PM-MgONPs Sensor | Modified LTZ-PM-CuONPs Sensor |
---|---|---|---|
Slope (mV. Decade−1) | 53.3 ± 0.5 | 56.4 ± 0.7 | 58.7 ± 0.5 |
Intercept | 451.4 | 569.6 | 692.6 |
Regression equation | EmV = (53.3 ± 0.5) log [LTZ] + 451.4 | EmV = (56.4 ± 0.7) log [LTZ] + 569.6 | EmV = (58.7 ± 0.5) log [LTZ] + 692.6 |
Correlation coefficient, r | 0.9996 | 0.9998 | 0.9999 |
Linear range (mol L−1) | 10 × 10−6–1.0 × 10−2 | 1.0 × 10−8–1.0 × 10−2 | 1.0 × 10−10–1.0 × 10−2 |
LOD | 5.0 × 10−7 | 5.9 × 10−9 | 5.6 × 10−11 |
Response time/s | 75 | 45 | 30 |
Working pH range | 2–5 | 2–5 | 2–5 |
Lifetime/day | 20 | 50 | 65 |
Temperature, °C | 25 | 25 | 25 |
Accuracy (%) | 99.3 ± 0.4 | 99.6 ± 0.3 | 99.8 ± 0.3 |
Interferences | Conventional Coated Wire LTZ-PM Sensor (KpotLTZ+) | Modified LTZ-PM-MgONPs Sensor (KpotLTZ+) | Modified LTZ-PM-CuONPs Sensor (KpotLTZ+) |
---|---|---|---|
Na+ | 5.4 × 10−3 | 4.8 × 10−4 | 9.2 × 10−5 |
K+ | 1.9 × 10−3 | 3.3 × 10−4 | 4.8 × 10−4 |
Ag+ | 3.1 × 10−3 | 1.5 × 10−3 | 8.4 × 10−4 |
Ni2+ | 5.6 × 10−3 | 4.2 × 10−3 | 2.2 × 10−3 |
Mg2+ | 6.8 × 10−3 | 7.9 × 10−4 | 8.7 × 10−4 |
Cu2+ | 6.6 × 10−3 | 1.4 × 10−4 | 2.3 × 10−5 |
Zn2+ | 4.9 × 10−3 | 4.9 × 10−4 | 6.3 × 10−4 |
Glucose | 3.6 × 10−3 | 9.9 × 10−4 | 4.2 × 10−4 |
Lactose | 3.9 × 10−3 | 6.7 × 10−4 | 5.6 × 10−4 |
Starch | 4.8 × 10−3 | 2.3 × 10−4 | 2.1 × 10−3 |
Lysine | 1.4 × 10−3 | 8.9 × 10−3 | 9.5 × 10−4 |
L-histidine | 2.6 × 10−3 | 2.7 × 10−4 | 3.2 × 10−5 |
Tryptophan | 5.5 × 10−3 | 5.8 × 10−4 | 5.4 × 10−5 |
Glycine | 8.4 × 10−3 | 3.6 × 10−3 | 6.6 × 10−4 |
Valine | 2.6 × 10−3 | 8.4 × 10−3 | 2.5 × 10−4 |
Leucine | 2.5 × 10−3 | 3.5 × 10−3 | 2.9 × 10−4 |
Talc | 5.2 × 10−3 | 2.2 × 10−4 | 9.1 × 10−5 |
SiO2 | 3.7 × 10−3 | 7.7 × 10−3 | 8.2 × 10−4 |
TiO2 | 7.8 × 10−3 | 7.8 × 10−4 | 7.8 × 10−4 |
Magnesium stearate | 3.9 × 10−3 | 4.5 × 10−3 | 7.3 × 10−5 |
Microcrystalline cellulose | 4.5 × 10−3 | 1.8 × 10−4 | 3.6 × 10−4 |
Statistical analysis | Conventional LTZ-PM Coated Wire Sensor | Modified LTZ-PM MgONPs Sensor | Modified LTZ-PM CuONPs Sensor | |||
Test Solution | % Recovery | Test Solution * | % Recovery | Test Solution * | % Recovery | |
6 | 98.5 | 8 | 99.8 | 10 | 100.0 | |
5.3 | 99.2 | 7 | 99.7 | 9 | 99.7 | |
5 | 99.8 | 6 | 100.0 | 8 | 99.9 | |
4 | 99.5 | 5 | 100.2 | 7 | 100.0 | |
3 | 98.0 | 4 | 99.8 | 6 | 99.7 | |
2 | 98.7 | 3 | 98.7 | 5 | 99.2 | |
2 | 99.0 | 4 | 99.8 | |||
3 | 99.3 | |||||
2 | 99.5 | |||||
Mean ± SD | 98.9 ± 0.7 | 99.6 ± 0.5 | 99.7 ± 0.3 | |||
n | 6 | 7 | 9 | |||
Variance | 0.49 | 0.25 | 0.09 | |||
RSD % | 0.71 | 0.50 | 0.30 | |||
SE ** | 0.29 | 0.18 | 0.12 |
Statistical Analysis | Modified LTZ-PM-MgONPs Coated Wire Sensor | |||||
Intra-Day Assay | Inter-Day Assay | |||||
Test Solution * | Found * | % Recovery | Test Solution * | Found * | % Recovery | |
8.0 | 7.98 | 99.50 | 8.0 | 7.97 | 99.60 | |
6.0 | 6.00 | 100.00 | 6.0 | 5.99 | 99.80 | |
4.0 | 3.98 | 99.50 | 4.0 | 3.96 | 99.00 | |
Mean ± SD | 99.8 ± 0.3 | 99.5 ± 0.4 | ||||
n | 3 | 3 | ||||
Variance | 0.09 | 0.16 | ||||
RSD % | 0.30 | 0.40 | ||||
SE ** | 0.17 | 0.23 | ||||
Statistical Analysis | Modified LTZ-PM-CuONPs Sensor | |||||
Intra-day assay | Inter-day assay | |||||
Test Solution * | Found * | % Recovery | Test solution * | Found * | % Recovery | |
10 | 10.00 | 100.00 | 10 | 9.99 | 99.90 | |
8 | 7.99 | 99.90 | 8 | 8.00 | 100.00 | |
6 | 5.98 | 99.70 | 6 | 5.97 | 99.50 | |
Mean ± SD | 99.9 ± 0.1 | 99.8 ± 0.2 | ||||
n | 3 | 3 | ||||
Variance | 0.01 | 0.04 | ||||
RSD % | 0.10 | 0.20 | ||||
SE ** | 0.06 | 0.12 |
Statistical Analysis | Conventional LTZ-PM Coated Wire Sensor | Modified LTZ-PM MgONPs Sensor | Modified LTZ-PM CuONPs Sensor | Reported Method [37] | |||
Test Solution * | % Recovery | Test Solution * | % Recovery | Test Solution * | % Recovery | ||
6 | 99.3 | 8 | 99.9 | 10 | 100.0 | 99.5 ± 0.4 | |
5.3 | 99.4 | 7 | 100.01 | 8 | 99.9 | ||
5 | 99.4 | 6 | 99.7 | 6 | 99.7 | ||
4 | 99.8 | 4 | 99.8 | 4 | 99.8 | ||
3 | 99.3 | 3 | 99.3 | 3 | 100.3 | ||
2 | 98.5 | 2 | 99.0 | 2 | 100.0 | ||
Mean ± SD | 99.3 ± 0.4 | 99.6 ± 0.3 | 99.9 ± 0.2 | ||||
n | 6 | 6 | 6 | ||||
Variance | 0.16 | 0.09 | 0.04 | ||||
RSD % | 0.40 | 0.30 | 0.20 | ||||
SE ** | 0.16 | 0.12 | 0.08 | ||||
t-test | 0.884 (2.228) *** | 0.500 (2.228) *** | 2.236 (2.228) *** | ||||
F-test | 1.00 (5.05) *** | 1.78 (5.05) *** | 4.00 (5.05) *** |
Initial [LTZ], mol L−1 | Added [LTZ] mol L−1 | LTZ-PM-MgONPs | LTZ-PM-CuONPs | Reported Method [55] |
---|---|---|---|---|
% Recovery ± %RSD | % Recovery ± %RSD | % Recovery ± %RSD | ||
8.9 | 0.5 | 98.2 ± 0.8 | 99.3 ± 0.7 | 97.3 ± 0.6 |
6.8 | 0.5 | 98.4 ± 0.6 | 99.2 ± 0.1 | 96.8 ± 0.9 |
8.5 | 0.5 | 98.8 ± 0.5 | 99.5 ± 0.2 | 97.2 ± 1.2 |
6.6 | 0.5 | 98.2 ± 0.4 | 98.9 ± 0.6 | 96.8 ± 0.9 |
8.4 | 0.5 | 98.3 ± 0.5 | 99.4 ± 0.3 | 97.3 ± 0.7 |
6.3 | 0.5 | 98.7 ± 0.9 | 99.8 ± 0.2 | 98.2 ± 1.2 |
6.7 | 0.5 | 99.3 ± 0.7 | 99.5 ± 0.3 | 96.9 ± 1.4 |
8.7 | 0.5 | 99.2 ± 0.4 | 99.7 ± 0.9 | 97.6 ± 0.9 |
7.2 | 0.5 | 98.6 ± 1.2 | 99.9 ± 0.1 | 98.1 ± 0.4 |
8.3 | 0.5 | 98.6 ± 0.8 | 99.7 ± 0.3 | 96.7 ± 1.1 |
7.4 | 0.5 | 98.9 ± 1.2 | 99.2 ± 0.6 | 97.5 ± 0.6 |
8.1 | 0.5 | 98.2 ± 0.7 | 98.9 ± 0.7 | 98.1 ± 1.2 |
7.9 | 0.5 | 98.6 ± 0.4 | 99.4 ± 0.2 | 96.8 ± 0.9 |
8.8 | 0.5 | 99.3 ± 0.8 | 99.8 ± 0.4 | 97.8 ± 0.6 |
7.5 | 0.5 | 98.4 ± 1.4 | 99.6 ± 0.1 | 98.3 ± 0.4 |
8.4 | 0.5 | 99.3 ± 0.7 | 99.9 ± 0.3 | 96.9 ± 1.1 |
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Shawky, A.M.; El-Tohamy, M.F. Highly Functionalized Modified Metal Oxides Polymeric Sensors for Potentiometric Determination of Letrozole in Commercial Oral Tablets and Biosamples. Polymers 2021, 13, 1384. https://doi.org/10.3390/polym13091384
Shawky AM, El-Tohamy MF. Highly Functionalized Modified Metal Oxides Polymeric Sensors for Potentiometric Determination of Letrozole in Commercial Oral Tablets and Biosamples. Polymers. 2021; 13(9):1384. https://doi.org/10.3390/polym13091384
Chicago/Turabian StyleShawky, Ahmed Mahmoud, and Maha Farouk El-Tohamy. 2021. "Highly Functionalized Modified Metal Oxides Polymeric Sensors for Potentiometric Determination of Letrozole in Commercial Oral Tablets and Biosamples" Polymers 13, no. 9: 1384. https://doi.org/10.3390/polym13091384