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Frag, E. Y. Z., G. G. Mohamed, A. B. Farag, and E. B. Yussof, "Utility of π and σ-acceptor reagents for the spectrophotometric determination of cefotaxime sodium antibacterial drug via charge transfer complex formation", Insight Pharmaceutical Sciences, 2011. Abstract

Background: The antibacterial drugs were the first effective chemotherapeutic agents to be employed systematically for the prevention and cure of bacterial infection in humans. The considerable medical and their subsequent wide spread use were quickly reflected in the sharp decline in morbidity and mortality figures for the treatable infections diseases. Before penicillin became generally available, cefotaxime sodium was the mainstry of antibacterial chemotherapy.

Frag, E. Y. Z., M. A. Zayed, M. M. Omar, S. E. A. Elashery, and G. G. Mohamed, "Potentiometric determination of chlorpromazine HCl using carbon paste electrode in pure and pharmaceutical preparations", Int. J. Electrochem. Sci, vol. 7, pp. 650 - 662, 2012.
Frag, E. Y. Z., H. M. Elqudaby, N. F. A. El-Dien, N. M. Kamal, and G. G. Mohamed, "Extractive Spectrophotometric Method for Determination of Meoxipril HCl and Perindopril in raw materials and tablets using ion pair formation", International Journal of Chemical and Analytical Science, vol. 3, issue 3, pp. 1334-1339, 2012.
Frag, E. Y. Z., G. G. Mohamed, and H. M. S. Alelaiwi, "Utility of ion-associate formation reactions for the spectrophotometric determination of sildenafil citrate in pure form and in Virecta tablets", Pharmaceutica Analytica Acta, vol. 2 , issue 6, pp. 1-7, 2011.
Frag, E. Y. Z., A. M. K. Mohamed, G. G. Mohamed, and E. E. Alrahmony, "Construction and performance characterization of ion selective electrodes for potentiometric determination of ranitidine hydrochloride in pharmaceutical preparations and biological fluids", International Journal of Electrochemical Science, vol. 6, pp. 3508-3524, 2011.
Frag, E. Y., G. G. Mohamed, A. B. Farag, and E. B. Yussof, "Utility of π and σ-acceptor reagents for the spectrophotometric determination of cefotaxime sodium antibacterial drug via charge transfer complex formation", Insight Pharmaceutical Sciences, vol. 1, issue 4, pp. 47-54, 2011.
Frag, E. Y. Z., M. M. Omar, and H. A. Mohamed, "Electrochemical characterization of vanadium(V) sensors modified with 2,4-dinitrophenyl hydrazine. Studying the reaction mechanism using SEM and IR", Journal of Electroanalytical Chemistry , vol. 784, pp. 124–132, 2017.
Frag, E. Y., and G. G. Mohamed, "Electronic, infrared, mass, 1H NMR spectral studies of the charge-transfer complexes of sulphonamide drugs with π-acceptors in acetonitrile.", . J. Molecular Structure, vol. 979, issue 4, pp. 46-55, 2010.
Frag, E. Y. Z., M. A. Zayed, M. M. Omar, S. E. A. Elashery, and G. G. Mohamed, "Spectrophotometric determination of carbamazepine and mosapride citrate in pure and pharmaceutical preparations.", Arabian Journal of Chemistry, vol. 5, pp. 375-382, 2012.
Frag, E. Y. Z., G. G. Mohamed, and M. H. Gaber, "Sensitive extractive spectrophotometric method for the determination of some statin drugs in pharmaceutical preparations", Insight Pharmaceutical Sciences, vol. 1, issue 4, 2011. AbstractCU-PDF.pdf

Background: The statins (or HMG-CoA reductase inhibitors) formed a class of hypolipidemic drugs used to lower cholesterol levels in people with or at risk of cardiovascular disease. They lower cholesterol by inhibiting the enzyme HMG-CoA reductase, which is the rate-limiting enzyme of the mevalonate pathway of chloestrol synethesis. The context and purpose: Simple, sensitive and rapid extractive spectrophotometric method has been developed for the assay of statin drugs, simvastatin, pravastatin sodium and atorvastatin calcium, in pure form and in tablets. The method involves the formation of coloured ion-pairs between the drugs and the Mo(V)-thiocyanate

Frag, E. Y. Z., H. M. Elqudaby, G. G. Mohamed, and M. A. Mohamed, "Optimized and validated spectrophotometric methods for the determination of clomipramine and paroxetine hydrochloride in drug formulations", International Journal of Research in Ayurveda and Pharmacy, vol. 3, issue 4, pp. 537-542, 2012.
Frag, E. Y. Z., G. G. Mohamed, M. M. Khalil, and M. M. A. Hwehy, "Potentiometric Determination of Ketotifen Fumarate in Pharmaceutical Preparations and Urine Using Carbon Paste and PVC Membrane Selective Electrodes", International Journal of Analytical Chemistry, pp. 1-7, 2011.
Frag, E. Y. Z., G. G. Mohamed, and M. A. Mohamed, "A novel clomipramine and paroxetine-selective membrane sensors and their applications in pharmaceutical analysis. H.M. Elqudaby", Anal. Bioanal. Electrochem, vol. 3, issue 4, pp. 420-435, 2011.
Frag, E. Y. Z., G. G. Mohamed, and H. M. S. Alelaiwi, "Utility of Ion-Associate Formation Reactions for the Spectrophotometric Determination of Sildenafil Citrate in Pure Form and in Virecta Tablets", PharmaceuticaAnalyticaActa, 2011. Abstract

A simple, rapid and sensitive extractive spectrophotometric method has been developed for the assay ofsildenafil citrate (SILC) in pure and pharmaceutical formulations (Virecta tablets). This method is based on theformation of chloroform soluble ion-pair of SILC with bromothymol blue (BTB) and methylene chloride soluble ionpairof SILC with bromophenol blue (BPB) and eriochrome blue black R (EBBR) in borax buffer of pH 3 and volume1mL for BTB while acetate buffer of pH 3 and volume 1mL for BPB and universal buffer of pH 2 and volume 1.5 mLfor EBBR with absorption maximum at 415, 420 nm and 510 nm for BTB, BPB and EBBR reagents, respectively.

Frag, E. Y. Z., N. F. A. El-Dien, G. G. Mohamed, and M. E. - B. Mohamed, "The use of integrated analytical tools for determination of cyclopentolate and naphazoline hydrochlolrides in pure and pharmaceutical preparations", Pharmaceutica Analytica Acta, vol. 2 , issue 1, pp. 114 (1-6), 2011.
Frag, E. Y. Z., G. G. Mohamed, N. F. A. El-Dien, and M. E. - B. Mohamed, "The Use of Integrated Analytical Tools for Determination ofCyclopentolate and Naphazoline Hydrochlolrides in Pure and Pharmaceutical Preparations", Pharmaceutica Analytica Acta, 2011. Abstract

Simple and sensitive spectrophotometric methods were described for the determination of cyclopentolate (CPH) and naphazoline hydrochlorides (NPZ) drugs in pure form and in pharmaceutical preparations based on ion pair and charge transfer complexation reactions, respectively. The first method is based on the reaction of the CPH drug with Mo(V)-thiocyanate in hydrochloric acid medium and dyestuff reagents namely bromophenol blue (BPB), bromocresol green (BCG) and bromocresol purple (BCP).

Frag, E. Y. Z., M. A. Zayed, M. M. Omar, S. E. A. Elashery, and G. G. Mohamed, "Spectrophotometric determination of carbamazepine and mosapride citrate in pure and pharmaceutical preparations", Arabian J. Chemistry, vol. 5, pp. 375-382, 2012.
Frag, E. Y., N. A. El-Zaher, and S. E. A. Elashery, "Carbon thick sheet potentiometric sensor for selective determination of silver ions in X-ray photographic film", Microchemical Journal, vol. 155, issue 104750, 2020.
Fradin, M. S., "Mosquitoes and mosquito repellents: a clinician's guide", Annals of internal medicine, vol. 128, issue 11: American College of Physicians, pp. 931-940, 1998. Abstract
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Fowler, M., Analysis {Patterns}: {Reusable} {Object} {Models}, , Reading, Massachusetts, Addison-Wesley, 1997. Abstract
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