Publications

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2015
Michael, A. M., M. R. Rezk, H. M. Lotfy, and M. A. Shehata, "Comparative Study of Multivariate and Univariate Determination of Zolmitriptan in the Presence of its Degradation products", Analytical Chemistry Letters, vol. 5, issue 2, pp. 73-84, 2015.
Lotfy, H. M., M. A. Hegazy, M. R. Rezk, and Y. R. Omran, "Comparative study of novel versus conventional two-wavelength spectrophotometric methods for analysis of spectrally overlapping binary mixture", Spectrochimica. Acta A, vol. 148, pp. 328-337, 2015.
El-Rahman, M. A. K., M. R. Rezk, A. M. Mahmoud, and M. R. Elghobashy, "Design of a Stable Solid-Contact Ion-Selective Electrode based on Polyaniline Nanoparticles as Ion-to-Electron Transducer for Application in Process Analytical Technology as a Real-Time Analyzer", Sensors & Actuators B, vol. 208, pp. 14-21, 2015.
Rezk, M. R., E. B. Basalious, and I. A. Karim, "Development of a sensitive UPLC-ESI-MS/MS method for quantification of sofosbuvir and its metabolite, GS-331007, in human plasma: Application to a bioequivalence study", Journal of Pharmaceutical and Biomedical Analysis, vol. 114, pp. 97-104, 2015.
Rezk, M. R., S. M. Riad, F. I. Khattab, and H. M. Marzouk, "Multi-residues determination of antimicrobials in fish tissues by HPLC-ESI-MS/MS method", J Chromatogr. B, vol. 978-979 , pp. 103-110, 2015.
El-Rahman, M. A. K., H. M. Lotfy, M. A. Hegazy, M. R. Rezk, and Y. R. Omran, "A Novel Sensor for Determination of Dexamethasone Disodium Phosphate in Different Pharmaceutical Formulations", Anal. Bioanal. Electrochem, vol. 7, issue 6, pp. 752-763, 2015.
Hegazy, M. A., H. M. Lotfy, M. R. Rezk, and Y. R. Omran, "Novel spectrophotometric determination of chloramphenicol and dexamethasone in the presence of non labeled interfering substances using univariate methods and multivariate regression model updating", Spectrochimica. Acta A, vol. 140, pp. 600-613, 2015.
Rezk, M. R., "Selective Determination of Diclazuril in Presence of its Degradation Products", J Chromatogr. Sci., vol. 53, issue 2, pp. 302-306, 2015.
Rezk, M. R., and K. A. Badr, "Simple and rapid LC-method for determination of moxifloxacin in human plasma: A bioequivalence study in healthy volunteers", Analytical Chemistry, An Indian Journal, vol. 15, issue 6, pp. 225-232, 2015.
Khattab, F. I., S. M. Riad, M. R. Rezk, M. K. Abd El-Rahman, and H. M. Marzouk, "A Single novel PVC membrane for dual determination of sulphadimethoxine and malachite green in aquatic environment", Arabian Journal of Chemistry, vol. 8, pp. 787-792, 2015.
A.Yehia, M., M. R. Rezk, M. A.El-Sayed, and M. A. Kawy, "Stability-Indicating Methods for determination of sildenafil in presence of its degradation product", Analytical Chemistry, An Indian Journal, vol. 15, issue 11, pp. 476-489, 2015.
A.Yehia, M., M. R. Rezk, M. A.El-Sayed, and M. A. Kawy, "Stability-Indicating Methods for determination of Terazocin in presence of its degradation product", Analytical Chemistry, An Indian Journal, vol. 15, issue 12, pp. 491-504, 2015.
Elghobashy, M. R., A. M. Mahmoud, M. R. Rezk, and M. A. K. El-Rahman, "Strategy for Fabrication of Stable Tramadol Solid-Contact Ion-Selective Potentiometric Sensor Based on Polyaniline Nanoparticles", Journal of Electrochemical Society, vol. 162, issue 1, pp. H1-H5, 2015.
2014
Riad, S. M., M. R. Rezk, F. I. Khattab, M. K. Abd El-Rahman, and H. M. Marzouk, "Anions Selective Electrodes with Unusual Half Nernstian Response", Anal. Bioanal. Electrochem, vol. 6, issue 4, pp. 392-402, 2014.
Elghobashy, M. R., and M. R. Rezk, "Comparative Study of Different Ionophores in Ion Selective Electrodes for Stability indicating Determination of Moxifloxacin", Anal. Bioanal. Electrochem, vol. 6, issue 4, pp. 461-474, 2014.
Rezk, M. R., and K. A. Badr, "Development, optimization and validation of a highly sensitive UPLC-ESI-MS/MS method for simultaneous quantification of amlodipine, benazeprile and benazeprilat in human plasma: Application to a bioequivalence study", Journal of Pharmaceutical and Biomedical Analysis, vol. 98, pp. 1-8, 2014.
Riad, S. M., M. R. Rezk, K. Ahmed, and H. Salem, "Ion-Selective Membrane Sensors for the Determination of Tinidazole and Clarithromycin in Bulk Powder and Pharmaceutical Formulation", Anal. Bioanal. Electrochem, vol. 6, issue 4, pp. 688-700, 2014.
Lotfy, H. M., M. A. Hegazy, M. R. Rezk, and Y. R. Omran, "Novel spectrophotometric methods for simultaneous determination of timolol and dorzolamide in their binary mixture", Spectrochimica. Acta A, vol. 126, issue 21, pp. 197-207, 2014.
Rezk, M. R., A. M. Michael, A. O. El-Kadi, H. M. Lotfy, and M. A. Shehata, "A Rapid and Sensitive HPLC Assay of Some Concomitant Anti-Migraine Drugs", Journal of Chromatographic Science, vol. 52, issue 7, pp. 704-706, 2014.
Salem, H., S. M. Riad, M. R. Rezk, and K. Ahmed, "Simultaneous Determination of Omeprazole, Tinidazole and Clarithromycin in Bulk Powder and Helicure Tablets by HPLC", Chromatography Separation Techniques, vol. 5, issue 2, 2014.
Khattab, F. I., S. M. Riad, M. R. Rezk, and H. M. Marzouk, "Simultaneous Determination of Sulphadiazine Sodium and Trimethoprim in Medicated Fish Feed, Fish Tissues and in Their Veterinary Pharmaceutical Formulation by Thin-Layer Chromatography-Densitometry", Journal of Planar Chromatography, vol. 27, issue 2, pp. 113-119, 2014.
A.Yehia, M., M. R. Rezk, M. A.El-Sayed, and M. A. Kawy, "Stability-Indicating Methods for determination of tadalafil in presence of its degradation product", Analytical Chemistry, An Indian Journal, vol. 14, issue 9, pp. 351-362, 2014.
2013
Rezk, M. R., and S. A. Abdel-Gawad, "Chromatographic determination of sitagliptin and simvastatin in their pharmaceutical formulation", Analytical Chemistry, An Indian Journal, vol. 12, issue 7, pp. 243 -247, 2013. Abstract

Two methods namely, coupled TLC densitometry and high performance liquid chromatography, were used to determine sitagliptin and simvastatin simultaneously in their pharmaceutical dosage form. A TLC separation with densitometric detection of both drugs was achieved using benzene: n-butanol: triethylamine (9:2:0.5, by volumes] as a developing solvent. Furthermore, a high performance liquid chromatographic procedure with ultraviolet detection at 220 nm was developed for the separation and determination of the studied drugs using a C18 column. The mobile phase was composed of water: methanol: acetonitrile (1: 2: 2, by volumes). The final pH was adjusted to 4.6 ± 0.1 with O-phosphoric acid. The proposed methods were successfully applied for the determination of the studied drugs in pure forms, their mixtures and in pharmaceutical formulation containing them.

Lotfy, H. M., M. R. Rezk, A. M. Michael, and M. A. Shehata, "Determination of Sumatriptan and Zolmitriptan in Presence of Their Corresponding Degradation Products by HPTLC Methods", Chromatographia, vol. 76, pp. 187-194, 2013.
Rezk, M. R., S. M. Riad, F. I. Khattab, and H. M. Marzouk, "Electrochemical Determination of Ciprofloxacin Hydrochloride in Pharmaceutical Formulation, Aquatic Environment and in Fish Tissues", International Journal of Biological & Pharmaceutical Research, vol. 4, issue 6, pp. 390-396, 2013.
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