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Affiliation(s)
- M. Aboudan
- b Chemistry Department, Faculty of Science , Aleppo University , Aleppo , Syria
| | - A. F. Shoukry
- a Chemistry Department, Faculty of Science , Cairo University , Giza , Egypt
| | - Y. M. Issa
- a Chemistry Department, Faculty of Science , Cairo University , Giza , Egypt
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Rizk MS, Issa YM, Shoukry AF, Atia EM. Spectrophotometric Determination of Lignocaine in Pure Form and in Pharmaceutical Preparations. ANAL LETT 2006. [DOI: 10.1080/00032719708001818] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Issa YM, Abdel-Ghani NT, Shoukry AF, Ahmed HM. New Conventional Coated-Wire Ion-Selective Electrodes for Flow-Injection Potentiometric Determination of Chlordiazepoxide. ANAL SCI 2005; 21:1037-42. [PMID: 16363470 DOI: 10.2116/analsci.21.1037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
New chlordiazepoxide hydrochloride (Ch-Cl) ion-selective electrodes (conventional type) based on ion associates, chlordiazepoxidium-phosphomolybdate (I) and chlordiazepoxidium-phosphotungstate (II), were prepared. The electrodes exhibited mean slopes of calibration graphs of 59.4 mV and 60.8 mV per decade of (Ch-Cl) concentration at 25 degrees C for electrodes (I) and (II), respectively. Both electrodes could be used within the concentration range 3.16 x 10(-6)-1 x 10(-2) M (Ch-Cl) within the pH range 2.0-4.5. The standard electrode potentials were determined at different temperatures and used to calculate the isothermal coefficients of the electrodes, which were 0.00139 and 0.00093 V degrees C(-1) for electrodes (I) and (II), respectively. The electrodes showed a very good selectivity for Ch-Cl with respect to the number of inorganic cations, amino acids and sugars. The electrodes were applied to the potentiometric determination of the chlordiazepoxide ion and its pharmaceutical preparation under batch and flow injection conditions. Also, chlordiazepoxide was determined by conductimetric titrations. Graphite, copper and silver coated wires were prepared and characterized as sensors for the drug under investigation.
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Affiliation(s)
- Y M Issa
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
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Abdel-Ghani NT, Shoukry AF, Issa YM, Wahdan OA. Spectrophotometric determination of meclozine HCl and papaverine HCl in their pharmaceutical formulations. J Pharm Biomed Anal 2002; 28:373-8. [PMID: 11929681 DOI: 10.1016/s0731-7085(01)00607-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A simple, accurate and highly sensitive spectrophotometric method is proposed for the rapid determination of meclozine and papaverine hydrochlorides using chromotrope 2B (C2B) and chromotrope 2R (C2R). The method consists of extracting the formed ion-associates into chloroform in the case of meclozine HCl and into methylene chloride in case of papaverine HCl. The ion-associates exhibit absorption maxima at 536 and 524 nm for C2B and C2R with meclozine HCl and at 540 and 528 nm with papaverine HCl, respectively. Meclozine can be determined up to 4.0 and 2.6 mg ml(-1), using C2B and C2R, respectively, while papaverine can be determined up to 1.68 and 1.37 mg ml(-1), respectively. The effect of acidity, reagent concentration, time, solvent and stoichiometric ratio of the ion-associates were studied. The molar absorptivity and Sandell sensitivity of the reaction products were calculated. The method was applied to the determination of the drugs in their pure state or pharmaceutical preparations with mean recovery values of 99.63-100.80 and 99.75-100.08% and coefficient of variation 0.945-2.210 and 1.020-1.268 for meclozine HCl and papaverine HCl, respectively.
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Affiliation(s)
- N T Abdel-Ghani
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
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Issa YM, Shoukry AF, El-Nashar RM. Conductimetric determination of reproterol HCl and pipazethate HCl and salbutamol sulphate in their pharmaceutical formulations. J Pharm Biomed Anal 2001; 26:379-86. [PMID: 11489383 DOI: 10.1016/s0731-7085(01)00415-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A simple and sensitive conductimetric method for the determination of salbutamol sulphate and reproterol and pipazethate hydrochlorides is presented based on their ion associates with phosphotungstic and phosphomolybdic acids. The effect of solvent, molar ratio, reagent concentration and temperature were studied, and the solubility products of the formed ion associates were calculated. The method was applied to the determination of the drugs in their pure state or pharmaceutical preparations with mean recovery values of 99.82-100.54, 99.75-100.12 and 99.95-100.40%, and coefficient of variation 0.28-0.52, 0.16-0.36 and 0.19-0.33 for salbutamol sulphate, reproterol HCl and pipazathate HCl, respectively.
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Affiliation(s)
- Y M Issa
- Chemistry Department, Faculty of Science, Cairo University, Cairo, Egypt.
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Shoukry AF, Abdel Ghani NT, Issa YM, Wahdan OA. SPECTROPHOTOMETRIC DETERMINATION OF DIPYRIDAMOLE AND CHLORPHENIRAMINE MALEATE USING SOME CHROMOTROPIC ACID AZO DYES. ANAL LETT 2001. [DOI: 10.1081/al-100105352] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Abstract
New plastic membrane electrodes for pipazethate hydrochloride based on pipazethatium phosphotungstate, pipazethatium phosphomolybdate and a mixture of the two were prepared. The electrodes were fully characterized in terms of composition, life span, pH and temperature and were then applied to the potentiometric determination of the pipazethate ion in its pure state and pharmaceutical preparations under batch and flow injection conditions. The selectivity of the electrodes towards many inorganic cations, sugars and amino acids was also tested.
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Affiliation(s)
- N T Abdel-Ghani
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
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Shoukry AF, Issa YM, Rizk MS, El-Nashar RM. Etilefrine Plastic Membrane Electrodes Based on Individual and Mixed Ion-exchangers of Etilefrinium Phosphotungstate and Tetraphenylborate. ANAL LETT 1996. [DOI: 10.1080/00032719608001497] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Shoukry AF, Issa YM, Rizk MS, Abdel-Aal MM. Amoxycillinium-Selective plastic membrane electrodes based on amoxycillinium-phosphotungstate ion associate. ELECTROANAL 1994. [DOI: 10.1002/elan.1140061018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rizk MS, Issa YM, Shoukry AF, Abdel-Aal MM. New Ampicillin Selective Plastic Membrane and Coated Metal Electrodes Based on Ampicillinium Phosphotungstate Ion pair. ANAL LETT 1994. [DOI: 10.1080/00032719408000278] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Issa YM, Shoukry AF, Ibrahim H, Mohamed SK. Atomic Emission Spectrometric Determination of Antazoline, Hydralazine, Amiloride, Thiamine and Quinine Based on Formation of Ion Associates with Ammonium Reineckate. ANAL LETT 1994. [DOI: 10.1080/00032719408000267] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Zareh MM, Issa YM, Shoukry AF, Shohaib RE. Potentiometric determination of ephedrine hydrochloride using plastic membrane ion-selective electrode. J Chem Technol Biotechnol 1993; 58:371-376. [PMID: 7764360 DOI: 10.1002/jctb.280580410] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A plastic membrane electrode based on phenylephrine-tetraphenylborate ion association shows a Nernstian response to both ephedrinium (Ep+) and silver (Ag+) cations over the concentration ranges 2 x 10(-5)-10(-1) M and 10(-5)-10(-1) M for Ep+ and Ag+, respectively. The performance characteristics of the electrode were investigated. The electrode proved to be an excellent potentiometric sensor for the determination of Ep-hydrochloride in its pure solutions and pharmaceutical preparations using the extrapolation method and potentiometric titration using a standard solution of AgNO3.
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Affiliation(s)
- M M Zareh
- Chemistry Department, Faculty of Science, Zagazig University, Egypt
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Shoukry AF, Issa YM, Ibrahim H, El-rashiedy OA. Papaverine-Selective Plastic Membrane Electrode Based on Papaverinium Tetraphenylborate. ANAL LETT 1991. [DOI: 10.1080/00032719108053018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Shoukry AF, Issa YM. Construction and Performance Characteristics of a Chromotropate Sensing Plastic Membrane Electrode. ANAL LETT 1989. [DOI: 10.1080/00032718908051249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Shoukry AF, Badawy SS. Selective membrane electrode potentiometry and spectrophotometry of a photochemical reaction of thioredazine hydrochloride. J Assoc Off Anal Chem 1988; 71:1042-5. [PMID: 3235398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A PVC membrane electrode of the coated wire type was prepared which is selective for thioredazine. It showed a Nernstian response over a thioredazine concentration range 6.3 x 10(-6) to 2.5 x 10(-3) M, at 25 degrees C, and was selective, precise, and usable within the pH range 2.1-7.0. The standard electrode potentials, E degrees, were determined at different temperatures and used to calculate the isothermal temperature coefficient of the electrode. The photoreaction occurring in thioredazine solution exposed to daylight did not affect the electrode performance. This reaction was investigated kinetically to determine its rate constant and half-life at different temperatures.
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Affiliation(s)
- A F Shoukry
- University of Cairo, Department of Chemistry, Faculty of Science, Giza, Egypt
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