Publications

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2016
Motaleb, M. A., I. T. Ibrahim, A. R. S. Rizq, and E. S. Elzanfaly, "Preparation, chromatographic evaluation and biodistribution of 99mTc-procainamide as a radiopharmaceutical for heart imaging", Radiochim. Acta, 2016.
Zaazaa, H. E., E. S. Elzanfaly, A. T. Soudi, and M. Y. Salem, "SPECTROPHOTOMETRIC METHOD FOR THE DETERMINATION OF TWO COFORMULATED DRUGS WITH HIGHLY DIFFERENT CONCENTRATIONS. APPLICATION ON VILDAGLIPTIN AND METFORMIN HYDROCHLORIDE", JOURNAL OF APPLIED SPECTROSCOPY, vol. 83, issue 1, pp. 154-157, 2016.
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
Nebsen, M., and E. S. Elzanfaly, "Stability-Indicating Method and LC–MS-MS Characterization of Forced Degradation Products of Sofosbuvir", Journal of Chromatographic Science, vol. 54, issue 9, pp. 1631-1640, 2016.
Darwish, H. W., E. S. Elzanfaly, A. S. Saad, and A. E. - B. Abdelaleem, "Full spectrum and selected spectrum based multivariate calibration methods for simultaneous determination of betamethasone dipropionate, clotrimazole and benzyl alcohol: Development, validation and application on commercial dosage form", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 169: Elsevier, pp. 50–57, 2016. Abstract
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Zaazaa, H. E., E. S. Elzanfaly, A. T. Soudi, and M. Y. Salem, "Spectrophotometric method for the determination of two coformulated drugs with highly different concentrations. Application on vildagliptin and metformin hydrochloride", Journal of Applied Spectroscopy, vol. 83, no. 1: Springer US, pp. 137–140, 2016. Abstract
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2015
Zaazaa, H. E., E. S. Elzanfaly, A. T. Soudi, and M. Y. Salem, "Application of the ratio difference spectrophotometry to the determination of ibuprofen and famotidine in their combined dosage form; Comparison with previously published spectrophotometric methods", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , vol. 143, pp. 251–255, 2015.
Saad, A. S., A. K. Attia, M. S. Alaraki, and E. S. Elzanfaly, "Comparative study on the selectivity of various spectrophotometric techniques for the determination of binary mixture of fenbendazole and rafoxanide", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , vol. 150, pp. 682–690, 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., 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., 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
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.
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., 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.
Zaazaa, H. E., E. S. Elzanfaly, A. T. Soudi, and M. Y. Salem, "Application of the ratio difference spectrophotometry to the determination of ibuprofen and famotidine in their combined dosage form; Comparison with previously published spectrophotometric methods", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 143: Elsevier, pp. 251–255, 2015. Abstract
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Saad, A. S., A. K. Attia, M. S. Alaraki, and E. S. Elzanfaly, "Comparative study on the selectivity of various spectrophotometric techniques for the determination of binary mixture of fenbendazole and rafoxanide", Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, vol. 150: Elsevier, pp. 682–690, 2015. Abstract
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2013
, "Ion Selective Membrane Electrodes for Stability Indicating Determination of Benoxinate Hydrochloride in Pure form and in Drug Product", Anal. Bioanal. Electrochem. , vol. 5, issue 2, pp. 166 - 177, 2013. Abstract

This paper presents a comparative study between four sensors
constructed to determine benoxinate hydrochloride (BX) in the presence of its hydrolysis
induced degradation product using different ion association complexes and plasticizers.
Precipitation based technique was used for sensors fabrication. The BX complexes with the
cationic exchangers; BX- reinikate, BX-tetraphenylborate, BX-phosphotungestate, and BXtetrakis
were obtained in situ by soaking the PVC membranes in 1×10-2 BX solution.
Dioctylphthalate and nitrophenyl octyl ether were used as solvent mediators. The proposed
sensors showed fast, stable Nernstian responses across a relatively wide BX concentration
range (5×10-5 to 10-1 M) in the pH range of 4-6. The suggested sensors could be used for
several weeks without any measurable change in sensitivity. They displayed good selectivity
for BX in presence of its degradation product, common inorganic and organic species. The
proposed sensors were successfully applied for the determination of BX in pure powder form
and eye drops where good recoveries were obtained.

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.

2012
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.
AbdElHamid, G., M. R. Elghobashy, E. S. Elzanfaly, S. M. Amer, and S. Z. ElKhateeb, "Ion Selective Membrane Electrodes for Stability Indicating Determination of Amisulpride", Anal. Bioanal. Electrochem. , vol. 4, issue 6, pp. 579 – 592, 2012.
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., 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., 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.
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