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K
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Ibrahim, M. M., M. B. El-Zeiny, N. K. Ramadan, E. S. Elzanfaly, and K. M. Kelani, "Spectrophotometric determination of meclizine hydrochloride and pyridoxine hydrochloride in laboratory prepared mixtures and in their pharmaceutical preparation ", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , vol. 178, pp. 234–238, 2017.
Ibrahim, N., E. S. Elzanfaly, A. E. El Gendy, and S. A. Hassan, "Development, optimization, and validation of a green spectrofluorimetric method for the determination of moxifloxacin using an experimental design approach", Research Journal of Pharmacy and Technology, vol. 14, no. 4, pp. 1880-1886, 2021. AbstractWebsite
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Hussein, O. G., E. S. Elzanfaly, H. E. Zaazaa, M. Abdelkawy, and S. A. Atty, "Analytical Eco-Scale for Evaluating the Greenness of Advanced Voltammetric Method Used for the Simultaneous Analysis of Combined Urinary Tract Infection Drugs in Different Matrices", Journal of the Electrochemical Society, vol. 169, no. 4, 2022. AbstractWebsite
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Heragy, M. O., A. A. M. Moustafa, E. S. Elzanfaly, and A. S. Saad, "A portable solid-state potentiometric sensor based on a polymeric ion-exchanger for the assay of a controversial food colorant (sunset yellow)", Analytical Methods, vol. 13, no. 41, pp. 4896-4903, 2021. AbstractWebsite
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Hassan, S. A., E. S. Elzanfaly, M. Y. Salem, and B. A. El-Zeany, "Mean centring of double divisor ratio spectra, a novel pectrophotometric method for analysis of ternary mixtures ", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , vol. 153, pp. 132–142, 2015.
Hassan, S. A., E. S. Elzanfaly, S. B. A. El-Zeany, and M. Y. Salem, "Development and validation of HPLC and CE methods for simultaneous determination of amlodipine and atorvastatin in the presence of their acidic degradation products in tablets", Acta pharmaceutica , vol. 66, issue 4, pp. 479-490, 2016.
Hassan, S. A., N. Ibrahim, E. S. Elzanfaly, and A. E. El Gendy, "Simultaneous Determination of Amlodipine and Olmesartan Using HPLC with Fluorescence Detection", Pharmaceutical Chemistry Journal, vol. 55, no. 2, pp. 206-212, 2021. AbstractWebsite
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Hassan, S. A., E. S. Elzanfaly, M. Y. Salem, and B. A. El-Zeany, "Mean centering of double divisor ratio spectra, a novel spectrophotometric method for analysis of ternary mixtures", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , vol. 153, pp. 132-142, 2016.
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Fayed, A. S., Youssif, R.M., N. N. Salama, H. A. Hendawy, and E. S. Elzanfaly, "Two-wavelength manipulation stability-indicating spectrophotometric methods for determination of meropenem and ertapenem: greenness consolidation and pharmaceutical product application ", Chemical Papers , vol. 73, issue 11, pp. 2723–2736, 2019.
Fayed, A. S., R. M. Youssif, N. N. Salama, E. S. Elzanfaly, and H. A. M. Hendawy, "Utility of Silver-nanoparticles for Nano Spectrofluorimetric Determination of Meropenem and Ertapenem: Bio-analytical Validation", Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, vol. 262, 2021. AbstractWebsite
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Essam, H. M., Y. F. Bassuoni, E. S. Elzanfaly, H. E. - S. Zaazaa, and K. M. Kelani, "Potentiometric sensing platform for selective determination and monitoring of codeine phosphate in presence of ibuprofen in pharmaceutical and biological matrices", Microchemical Journal, vol. 159, 2020. AbstractWebsite
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Elzanfaly, E. S., A. S. Saad, and A. - E. B. Abd-Elaleem, "Simultaneous determination of retinoic acid and hydroquinone in skin ointment using spectrophotometric technique (ratio difference method)", Saudi Pharmaceutical Journal, vol. 20, pp. 249–253, 2012.
Elzanfaly, E. S., N. N. Salama, R. M. Youssif, A. S. Fayed, H. A. M. Hendawy, and M. Y. Salem, "40) Zero and second‐derivative synchronous fluorescence spectroscopy for the quantification of two non‐classical β‐lactams in pharmaceutical vials: Application to stability studies", Luminescence, vol. 2017, pp. 1–11, 2017. luminesence_2017.pdf
Elzanfaly, E. S., and H. A. Merey, "36) A Liquid Chromatography/Tandem Mass Spectrometric Method for Determination of Captopril in Human Plasma: Application to a Bioequivalence Study", Journal of Applied Pharmaceutical Science, vol. 7 , issue 2, pp. 8-15, 2017. captopril_2017.pdf
Elzanfaly, E. S., H. E. Zaazaa, and H. A. Merey, "Ion Selective Phosphotungestate and β-cyclodextrin Based Membrane Electrodes for Stability-Indicating Determination of Midodrine Hydrochloride", Acta Chim. Slov., vol. 60 , issue 2, pp. 256–262, 2013. Abstract

This paper reports the construction and evaluation of two ion selective electrodes for the determination midodrine hydrochloride (MD) by direct potentiometry in pure drug substance and in tablet formulations. Precipitation based technique was used for fabrication of the first membrane sensor (sensor 1) using phosphotungestate (PT) and dioctylphthalate (DOP) as cation exchanger and solvent mediator, respectively. β-cyclodextrin (β-CD)-based technique with PT as a fixed anionic site in PVC matrix was used for fabrication of the second membrane sensor (sensor 2). The proposed sensors showed fast, stable Nernstian responses of 54 and 56 mV/decade for sensors 1 and 2, respectively, across a relatively wide MD concentration range (1 × 10–4 to 1 × 10–1 mol/L and 5 × 10–5 to 1 × 10–1 mol/L for sensor 1 and 2, respectively) in the pH range of 5–7. Sensor 1 and sensor 2 can be used for three and two weeks, respectively without any measurable change in sensitivity. The suggested electrodes succeeded to determine intact MD in the presence of up to 10% of its degradation product and displayed good selectivity in presence of common inorganic and organic species.

Elzanfaly, E. S., S. A. Hassan, M. Y. Salem, and B. A. El-Zeany, "Continuous Wavelet Transform, a powerful alternative to Derivative Spectrophotometry in analysis of binary and ternary mixtures: A comparative study", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , vol. 151, pp. 945–955, 2015.
Elzanfaly, E. S., H. E. Zaazaa, A. T. Soudi, and M. Y. Salem, "Multivariate Validated Models for Simultaneous Determination of Ibuprofen and Famotidine in the Presence of Related Substances", Journal of AOAC International, vol. 101, no. 4: Oxford University Press, pp. 1001–1007, 2018. Abstract
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