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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., M. N. Morkos, and N. K. Ramadan, "Development and validation of PCR, PLS and TLC densitometric methods for the determination of vitamins B1, B6 and B12 in pharmaceutical formulations", Pakistanian Journal of Pharmaceutical Sciences, vol. 23 , issue 4, pp. 409 - 415, 2010.
Elzanfaly, E. S., and S. A. Abdel-Gawad, "Simultaneous quantification of ramipril, glimepiride and metformin in human plasma by ultra-performance liquid chromatography – tandem mass spectrometry", Journal of Applied Pharmaceutical Science , vol. 7, issue 7, pp. 62-69, 2017. metformin_2017.pdf
Elzanfaly, E. S., E. A. Amer, S. A. Galal, and H. E. Zaazaa, "Stability Indicating Spectrophotometric Methods for the Determination of Oxetacaine in the Presence of Its Hydrolytic and Oxidative Degradation Products", Der Pharma Chemica, vol. 8, issue 22, pp. 32-37, 2016. oxetacaine_2016.pdf
Elzanfaly, E. S., H. E. Zaazaa, A. T. Soudi, and M. Y. Salem, "Validated chiral chromatographic methods for clopidogrel bisulphate and its related substances in bulk drug and pharmaceutical dosage forms", Chemical Papers, vol. 69, issue 12, pp. 1541–1547, 2015.
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., A. S.Saad, and A. E. B. A. Elaleem, "A smart simple spectrophotometric method for simultaneous determination of binary mixtures", Journal of Pharmceutical Analysis, vol. 2 , issue 5, 2012.
ElZanfaly, E. S., E. A. H. Amer, S. A. B. Galal, and H. E. Zaazaa, "Validated High Performance Liquid Chromatographic Method for Stability Study of Eptifibatide", Journal of Chromatographic Science,, vol. 57, issue 6, pp. 541-551, 2019.
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., 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., 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., S. A. Hassan, M. Y. Salem, and B. A. El-Zeany, "In-line potentiometric monitoring of dissolution behavior ofverapamil hydrochloride versus traditional pharmacopeial method: Acomparative study", Sensors and Actuators, vol. B 228, pp. 587–594, 2016.
Elzanfaly, E. S., S. A. Hassan, M. Y. Salem, and B. E. - Z. A. Salem, "Different signal processing techniques of ratio spectra for spectrophotometric resolution of binary mixture of bisoprolol and hydrochlorothiazide; a comparative study", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , vol. 140, pp. 334–343, 2015.
Elzanfaly, E. S., A. S. Saad, and A. - E. B. Abd-Elaleem, "Combining the isoabsorptive point in the ratio spectrum and the smart ratio difference methods for a single step determination of compounds with overlapped spectra", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 95, pp. 188–192, 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., Y. F. Bassuoni, H. A. M. Essam, and H. E. Zaazaa, "Ion Selective Membrane Electrodes for Determination of Cetrimide in Pure form and in Pharmaceutical Formulations ", Anal. Bioanal. Electrochem. , vol. 7 , issue 4, pp. 401-414, 2015. cetrimide_ise_2015.pdf
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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Elzanfaly, E. S., M. A. Hegazy, Samah S Saad, M. Y. Salem, and L. A. E. Fattah, "Validated green high-performance liquid chromatographic methods for the determination of coformulated pharmaceuticals: A comparison with reported conventional methods", J. Sep. Sci. , vol. 38, pp. 757–763, 2015.
Elzanfaly, E. S., A. S. Saad, and A. - E. B. Abd-Elaleem, "A Novel Simple Method for Resolving Overlapped Spectral Data with A Wide Range of Applicability, and Its Application as a Stability Indicating Method for Determination of Tazarotene ", Pharmaceutica Anaytical Acta, , vol. 3, issue 3, pp. 153, 2012.
ElZanfaly, E. S., E. A. H. Amer, S. A. B. Galal, and H. E. Zaazaa, "Spectrofluorimetric determination of eptifibatide in human plasma and dosage form", Luminescence, vol. 34, pp. 64–69, 2019. elzanfaly_et_al-2019-luminescence.pdf
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