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Motaal, A. A., S. M. Ezzat, T. S. El-Alfy, and H. I. El-Askary, "A Validated HPLC Method for Standardization of The Most Active Fraction of The Antihyperglycemic Drug Cleome droserifolia using Bioactive Markers", Planta Medica, vol. 77, pp. 1235, 2012.
Motaal, A. A., S. Ezzat, T. El Alfy, and H. El Askary, "A validated HPLC method for standardization of the most active fraction of the antihyperglycemic drug Cleome droserifolia using bioactive markers", Planta Medica, vol. 77, no. 12, pp. WSI7, 2011. Abstract
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El-Askary, H. I., D. A. Al-Mahdy, and A. M. Helal, "A Validated HPLC Method For Standardization of the Bioactive Stabilized Rice Bran Extract", The 3rd International Conference of Faculty of Pharmacy, Cairo University, Egypt, 2012.
El-Maraghy, C. M., H. Salem, S. M. Amer, and M. Nebsen, "Validated HPLC Method for Simultaneous Determination of Aripiprazole and Co-Administered Clonazepam in Spiked Human Plasma", Journal of Pharmaceutical and Applied Chemistry An International Journal, vol. 1, issue 3, pp. 57-61, 2017.
Mohamed, S. H., A. F. A. Youssef, M. Issa, H. S. Abdel Salam, and A. L. El-Ansary, "Validated HPLC method for quantitative analysis of gallic acid and rutin in leaves of moringa oleifera grown in egypt", Egyptian Journal of Chemistry, vol. 64, issue 3, pp. 1583–1591, 2021.
Elkady, E. F., R. I. El-Bagary, S. Mowaka, and M. A. Attallah, "Validated HPLC and ultra-HPLC methods for determination of dronedarone and amiodarone-application for counterfeit drug analysis", J. AOAC Int., vol. 98, 2015.
M., A. S., salem H., M. Nebsen, and E. C. M., "Validated HPLC and Thin Layer-Densitometric Methods for Determination of Quetiapine Fumarate in Presence of its Related Compounds", J Chromatogr Sep Tech, vol. 6, issue 5, pp. 275, 2015.
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., E. A. H. Amer, S. A. B. Galal, and H. E. Zaazaa, Validated High Performance Liquid Chromatographic Method for Stability Study of Eptifibatide, , vol. 57(6), 2019.
A.Abdel-Gawad, S., A. K. A. Suwailem, and S. S. AlShowiman, Validated High Performance Liquid Chromatographic Quantification of Pamidronate in Bulk and Dosage Form, , 2020.
Elzanfaly, E. S., M. A. Hegazy, Samah S Saad, M. Y. Salem, and L. E. Abdel Fattah, "Validated green high‐performance liquid chromatographic methods for the determination of coformulated pharmaceuticals: A comparison with reported conventional methods", Journal of separation science, vol. 38, issue 5: Wiley Online Library, pp. 757-763, 2015. 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., Samah S Saad, M. Y. Salem, L. A. E. Fattah, and M. A. Hegazy, "Validated green high-performance liquid chromatographic methods for the determination of coformulated pharmaceuticals: A comparison with reported conventional methods", journal of separation science, vol. 38, pp. 757-763, 2015. separation_science_samah.pdf
Elzanfaly, E. S., M. A. Hegazy, Samah S Saad, M. Y. Salem, and L. E. Fattah, "Validated green high-performance liquid chromatographic methods for determination of co-formulated pharmaceuticals: A comparison with reported cconventional methods", Journal of separation science, 2014. Abstract

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Ibrahim, H. K., M. M. Abdel-Moety, S. A. Abdel-Gawad, M. A. Al-Ghobashy, and M. A. Kawy, "Validated electrochemical and chromatographic quantifications of some antibiotic residues in pharmaceutical industrial waste water.", Environmental science and pollution research international, vol. 24, issue 8, pp. 7023-7034, 2017 Mar. Abstract

Realistic implementation of ion selective electrodes (ISEs) into environmental monitoring programs has always been a challenging task. This could be largely attributed to difficulties in validation of ISE assay results. In this study, the electrochemical response of amoxicillin trihydrate (AMX), ciprofloxacin hydrochloride (CPLX), trimethoprim (TMP), and norfloxacin (NFLX) was studied by the fabrication of sensitive membrane electrodes belonging to two types of ISEs, which are polyvinyl chloride (PVC) membrane electrodes and glassy carbon (GC) electrodes. Linear response for the membrane electrodes was in the concentration range of 10-10 mol/L. For the PVC membrane electrodes, Nernstian slopes of 55.1, 56.5, 56.5, and 54.0 mV/decade were achieved over a pH 4-8 for AMX, CPLX, and NFLX, respectively, and pH 3-6 for TMP. On the other hand, for GC electrodes, Nernstian slopes of 59.1, 58.2, 57.0, and 58.2 mV/decade were achieved over pH 4-8 for AMX, CPLX, and NFLX, respectively, and pH 3-6 for TMP. In addition to assay validation to international industry standards, the fabricated electrodes were also cross-validated relative to conventional separation techniques; high performance liquid chromatography (HPLC), and thin layer chromatography (TLC)-densitometry. The HPLC assay was applied in concentration range of 0.5-10.0 μg/mL, for all target analytes. The TLC-densitometry was adopted over a concentration range of 0.3-1.0 μg/band, for AMX, and 0.1-0.9 μg/band, for CPLX, NFLX, and TMP. The proposed techniques were successfully applied for quantification of the selected drugs either in pure form or waste water samples obtained from pharmaceutical plants. The actual waste water samples were subjected to solid phase extraction (SPE) for pretreatment prior to the application of chromatographic techniques (HPLC and TLC-densitometry). On the other hand, the fabricated electrodes were successfully applied for quantification of the antibiotic residues in actual waste water samples without any pretreatment. This finding assures the suitability of the fabricated ISEs for environmental analysis.

Ibrahim, H. K., M. M. Abdel-Moety, S. A. Abdel-Gawad, M. A. Al-Ghobashy, and M. A. Kawy, "Validated electrochemical and chromatographic quantifications of some antibiotic residues in pharmaceutical industrial waste water", Environmental Science and Pollution Research, vol. 24, issue 8: Springer, pp. 7023-7034, 2017. Abstract
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nagiba y. hassan, H. A. Merey, S. S. El-Mosallamy, and B. A. El-Zeany, "VALIDATED ECO-FRIENDLY SPECTROPHOTOMETRIC METHODS FOR THE DETERMINATION OF ACEFYLLINE PIPERAZINE AND BROMHEXINE HYDROCHLORIDE IN THE PRESENCE OF DOSAGE FORM ADDITIVES**", JOURNAL OF APPLIED SPECTROSCOPY, vol. 87, issue 1, pp. 1-10, 2020.
Merey, H. A., S. S. El-Mosallamy, N. Y. Hassan, and B. A. El-Zeany, "VALIDATED ECO-FRIENDLY SPECTROPHOTOMETRIC METHODS FOR THE DETERMINATION OF ACEFYLLINE PIPERAZINE AND BROMHEXINE HYDROCHLORIDE IN THE PRESENCE OF DOSAGE FORM ADDITIVES", Journal of Applied Spectroscopy, vol. 87, issue 1, pp. 159-168, 2020.
Alamein, A. A. A. M., "Validated eco-friendly chromatographic methods for simultaneous determination of sacubitril and valsartan in spiked human plasma and in pharmaceutical formulation", Journal of Applied Pharmaceutical Science , vol. 8, issue (02), pp. 011-017., 2018.
H. A. Merey, S. S. El-Mosallamy, N. Y. Hassan, and B. A. El-Zeany, "Validated eco--friendly spectrophotometric methods for the determination of acefylline piperazine and bromhexine hydrochloride in the presence of dosage form additives", Journal of Applied Spectroscopy, vol. 87, issue 1, pp. 159-168, 2020.
Salama, N. N., H. E. Zaazaa, L. A. E. M. Halim, M. Y. Salem, and L. A. E. Fattah, "A Validated Direct Thin-Layer Chromatographic Separation and Enantioselective Determination of Racemic Centrally Acting Drugs Using Ion-Pair and Ligand-Exchange Chiral Selectors: A Thermodynamic Study of Complexation", Journal of Planar Chromatography , vol. 29, issue 3, pp. 176–183, 2016.
Moussa, B. A., M. A. Mahrouse, M. A. Hassan, and M. G. Fawzy, "Validated difference spectrophotometric and stability indicating HPLC estimation of linezolid in tablets", International Journal of Pharmaceutical Analysis, Recent Sciences Publications, vol. 38, issue 2, pp. 1166-1173, 2013.
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, Recent Sciences Publications, vol. 38, issue 2, pp. 1146-1155, 2013.