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Hassib, S. T., A. E. Farag, M. A. Mahrouse, and E. A. Mostafa, "Validated Derivative Spectrophotometric and Chromatographic Methods for the Determination of Doxazosin Mesylate in Presence of its Degradation Product and/or Related Impurity", International Journal of Pharmaceutical Analysis, vol. 38, issue 2, pp. 1146-1155, 2013.
M.A.Hegazy, F. E.khattab, and B.M.Abdelhameed, "Validated chromatographicmethods for determination of paracetamol, pseudoephedrin and cetirizin in pharmaceutical formulation", Analytical chemistry, an indian journal, vol. 12, issue 7, pp. 248-255, 2013. Anal.chem.ind.J._3.pdf
El-Zaher, A. A., M. A. Mahrouse, and A. M. ElGhany, "Validated Chromatographic Methods for The Simultaneous Estimation of Etamsylate and Mefenamic Acid in Presence of Their Main Impurities ", Current pharmaceutical analysis, vol. 15, pp. 624-631, 2019.
Nariman A. El-Ragehy, M. A.Hegazy, G.AbdelHamid, and S. A. Tawfik, "Validated Chromatographic Methods for the Simultaneous Determination of Sulfacetamide Sodium and Prednisolone Acetate in their Ophthalmic Suspension", Journal of Chromatographic Science, vol. 55, issue 10, pp. 1000-1005, 2017. pdf.pdf
Ragehy, N. E., M. Hegazy, G. Sedik, and samia Tawfik, "Validated Chromatographic Methods for the Simultaneous Determination of Sulfacetamide Sodium and Prednisolone Acetate in their Ophthalmic Suspension", Journal of Chromatographic Science, vol. 1-6, 2017.
El-Ragehy, N. A., M. A. Hegazy, G. AbdElHamid, and S. A. Tawfik, "Validated chromatographic methods for the simultaneous determination of sulfacetamide sodium and prednisolone acetate in their ophthalmic suspension", Journal of chromatographic science, vol. 55, issue 10: Oxford University Press, pp. 1000-1005, 2017. Abstract
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El-Tanany, B. M., M. A. Hegazy, M. A. Al-Ghobashy, and F. I.; Khattab, "Validated Chromatographic Methods for the Simultaneous Determination of Sodium Cromoglycate and Oxymetazoline Hydrochloride in a Combined Dosage Form", Journal of Advances in Chemistry, vol. 11, issue 8, pp. 3850-3859, 2015.
Hegazy, M. A., M. A. Al-Ghobashy, B. M. Eltanany, and F. I. Khattab, "Validated chromatographic methods for the simultaneous determination of sodium cromoglycate and oxymetazoline hydrochloride in a combined dosage form", Journal: Journal of Advances in Chemistry, vol. 11, issue 8, 2015. Abstract
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Merey, H. A., S. S. El-Mosallamy, N. Y. Hassan, and B. A. El-Zeany, "Validated chromatographic methods for the simultaneous determination of Mometasone furoate and Formoterol fumarate dihydrate in a combined dosage form", Bulletin of Faculty of Pharmacy, Cairo University, vol. 54, pp. 99-106, 2016. Abstract

Two chromatographic methods were developed and validated for the simultaneous
determination of Mometasone furoate (MO) and Formoterol fumarate dihydrate (FOR). Combination
of MO and FOR is used for the treatment of asthma in patients suffering from reversible
obstructive airway disease. The first chromatographic method was based on using aluminum
TLC plates pre-coated with silica gel GF254 as the stationary phase and chloroform:ethyl acetate:
methanol:toluene:formic acid (5:2:2:2:0.1, by volume) as the mobile phase followed by densitometric
measurement of the separated bands at 233 nm. The second method is a high performance liquid
chromatographic method for the separation and determination of MO and FOR using reversed
phase C18 column with isocratic elution. The mobile phase composed of methanol: 0.5% ammonium
acetate pH adjusted with acetic acid (80:20, v/v) at a flow rate of 1.0 mL/min. Quantitation
was achieved with UV detection at 220 nm. The specificity of the developed methods was investigated
by analyzing the pharmaceutical dosage form. The validity of the proposed methods was
assessed using the standard addition technique. The obtained results were statistically compared
with those obtained by the reported methods, showing no significant difference with respect to accuracy
and precision at p = 0.05.

Merey, H. A., S. S. El-Mosallamy, N. Y. Hassan, and B. A. El-Zeany, "Validated chromatographic methods for the simultaneous determination of Mometasone furoate and Formoterol fumarate dihydrate in a combined dosage form", Bulletin of Faculty of Pharmacy, Cairo University , vol. 54, issue 1, pp. 99-106, 2016.
El-Ragehy, N. A., M. A. Hegazy, S. A. Tawfik, and G. A. Sedik, "Validated chromatographic methods for the simultaneous determination of a ternary mixture of sulfacetamide sodium and two of its official impurities; sulfanilamide and dapsone", Acta Chromatographica: Akadémiai Kiadó Budapest, 2021. Abstract
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Mahrouse, M. A., A. A. El-Zaher, and A. M. ElGhany, "Validated Chromatographic Methods for Simultaneous Estimation of Cinnarizine in Binary Mixture with Paracetamol & Domperidone in Tablets", Current pharmaceutical analysis, vol. 15, pp. 429-438, 2019.
Merey, H. A., S. S. El-Mosallamy, N. Y. Hassan, and B. A. El-Zeany, "Validated Chromatographic Methods for Simultaneous Determination of Calcipotriol Monohydrate and Betamethasone Dipropionate in the Presence of Two Dosage Form Additives.", Journal of chromatographic science, vol. 57, issue 4, pp. 305-311, 2019. Abstract

Two chromatographic methods were developed, optimized and validated for simultaneous determination of calcipotriol monohydrate (CPM) and betamethasone dipropionate (BMD) in the presence of two dosage form additives named; butylated hydroxytoluene (BHT) and alpha-tocopherol (TOCO). The proposed methods were accurate, sensitive and specific. The first method based on using aluminum thin-layer chromatographic plates precoated with silica gel GF254 as a stationary phase and chloroform-ethyl acetate-toluene (5:5:3, by volume) as a developing system. This was followed by densitometric measurement of the separated bands at 264 nm. Whereas the second method is RP-HPLC where OnyxMonolithic C18® column was used with a gradient profile using methanol, water and acetic acid at flow rate 2.0 mL min-1. Detection was carried out at 264 nm. The methods were validated according to ICH guidelines. The specificity of the developed methods was investigated by analyzing the pharmaceutical dosage form. The validity of the proposed methods was assessed using the standard addition technique. The obtained results were statistically compared with those obtained by the official methods, showing no significant difference with respect to accuracy and precision at P = 0.05.

Merey, H. A., S. S. El-Mosallamy, N. Y. Hassan, and B. A. El-Zeany, "Validated Chromatographic Methods for Simultaneous Determination of Calcipotriol Monohydrate and Betamethasone Dipropionate in the Presence of Two Dosage Form Additives", Journal of chromatographic Science, vol. 57, issue 4, pp. 305-311, 2019.
Zaazaa, H. E., S. S. Abbas, H. A. M. Essam, and M. G. El-Bardicy, "Validated Chromatographic Methods for Determination of Perindopril and Amlodipine in Pharmaceutical Formulation in the Presence of their Degradation Products", Journal of Chromatographic Science, vol. 51, issue 6, pp. 533-543, 2013.
E.Zaazaa, H., S. S.Abbas, H. A. M. Essam*, and M. G. El-Bardicy, "Validated Chromatographic Methods for Determination of Perindopril and Amlodipine in Pharmaceutical Formulation in the Presence of their Degradation Products", Journal of Chromatographic Science , vol. 51, pp. 533-543, 2013. 533.full_.pdf
Hegazy, M. A., F. H. Metwaly, M. Abdelkawy, and N. S. Abdelwahab, "Validated chromatographic methods for determination of hydrochlorothiazide and spironolactone in pharmaceutical formulation in presence of impurities and degradants", Journal of chromatographic science, vol. 49, issue 2: Oxford University Press, pp. 129-135, 2011. Abstract
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in of Impurities, F. P., and Degradants, "Validated Chromatographic Methods for Determination of Hydrochlorothiazide and Spironolactone in Pharmaceutical", Maha A. Hegazy, 2011. Abstract

Journal of Chromatographic science, 49: 1-7 (2011) IF: 1.078

Saleh, O. A., A. M. Yehia, A. A. El-Azzounya, and H. Y. Aboul-Enein, "A validated chromatographic method for simultaneous determination of guaifenesin enantiomers and ambroxol HCl in pharmaceutical formulation", RSC Advances, vol. 5, pp. 93749–93756, 2015. rsc_adv_5_2015.pdf
Boltia, S. A., M. Abdelkawy, T. A. Mohamed, and N. N. Mostafa, "Validated Chromatographic and Spectrofluorimetric Methods for Analysis of Silodosin: A Comparative Study with Application of RP-HPLC in the Kinetic Investigation of Silodosin Degradation", Journal of AOAC INTERNATIONAL, vol. 103, issue 4, pp. 946-957, 2020.
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., 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., H. E. Zaazaa, A. T. Soud, 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.
Youssef, R. B. - A., M. A. Fouad, and A. A. El-Zaher, "Validated analytical study of the effect of Lycopene on the pharmacokinetics of Paracetamol and Chlorzoxazone in rats", Brazilian Journal of Pharmaceutical Sciences, vol. 55, pp. e18084, 2019. bjps-reem.pdf
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