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Algethami FK, Koraim BH, Abdelrahman EA, El-Reash YGA, Rizk MS, Abdel-Haleem FM. Ionophore-modified polyaniline-based optode for the determination of hydrogen sulfite levels in beverages, wastewater, and soil. Anal Methods 2023; 15:6275-6285. [PMID: 37955946 DOI: 10.1039/d3ay01320k] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2023]
Abstract
Sulfite is a very important species, affecting human health, plant and animal life, and environmental sustainability. In this study, for the first time, an ionophore-based ion-selective optode was constructed for hydrogen sulfite determination in beverages, such as Birell® and Sprite®, water, and soil samples; instead of normal pH-chromoionophores, polyaniline film was precipitated on a glass slide and used for the transduction of the sensation mechanism. The ionophore-modified polyaniline-based optode incorporated thiourea derivative as an ionophore and tridodecyl methyl ammonium chloride as an ion-exchanger. The optode film was prepared in situ with a modified chemical polymerization method, and it was characterized using atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD); also, FTIR spectroscopy was performed for the film before and after interaction with hydrogen sulfite for mechanism elucidation. The optode was applied in the hydrogen sulfite concentration range of 10-1 to 10-5 M with a low detection limit of 8.0 × 10-6 M and minimum interference of other interfering species, such as salicylate, iodide, and sulphide. The response mechanism was due to the ion-exchange of hydrogen sulfite with the anion exchanger, followed by the molecular recognition between thiourea ionophore and hydrogen sulfite, with concomitant redox reaction via the protonation of the polyaniline that causes a decrease in absorbance at 685 nm. The optode was applied successfully for the determination of hydrogen sulfite in real beverages, Birell® and Sprite® without any pretreatment steps. Also, it was applied successfully for the environmental monitoring of hydrogen sulfite in real wastewater and soil samples.
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Affiliation(s)
- Faisal K Algethami
- Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia.
| | - Basant H Koraim
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Ehab A Abdelrahman
- Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia.
| | - Yasmeen G Abou El-Reash
- Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11623, Saudi Arabia.
| | - Mahmoud S Rizk
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Fatehy M Abdel-Haleem
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
- Center for Hazards Mitigation, Environmental Studies and Research (CHMESR), Faculty of Science, Cairo University, Giza, Egypt.
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Mohamed Ibrahim A, Abdel-Haleem FM, Salah A, Rizk MS, Abdel-Latif SA, Omar Turky A, Rashad MM, Barhoum A. Development of potentiometric sensors based on thiourea derivatives, Gd2O3@rGO and MoO3@rGO for the determination of salicylate in drug tablets and biofluids and DFT studies. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108064] [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: 11/27/2022]
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Taha MM, Rizk MS, Zayed MA, Abdel-Haleem FM, Barhoum A. Non-Enzymatic Phenylboronic Acid-Based Optode Membrane for Glucose Monitoring in Serums of Diabetic Patients and in the Culture Medium of Human Embryos. Sensors (Basel) 2022; 22:7135. [PMID: 36236234 PMCID: PMC9571803 DOI: 10.3390/s22197135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 08/30/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
Monitoring glucose levels is important not only for diabetics, but also for tracking embryonic development in human embryo culture media. In this study, an optochemical sensor (glucose-selective polymer membrane) was fabricated for the determination of glucose in serum from diabetic patients and the culture media of human embryos. The optode membranes were formulated using polyvinyl chloride (PVC) as the polymer matrix and 4',5'-dibromofluorescein octadecyl ester (ETH 7075) as the chromoionophore. The sensitivity of the optode membranes was optimized using two different plasticizers (tricresyl phosphate-TCP and nitrophenyloctyl ether-NOPE) and three ionophores (nitrophenylboronic acid-NPBA, trifluorophenyboronic acid-TFPBA, 4'-nitrobenzo-15-crown-5) and tested for glucose detection. The best optode membrane was formulated from 49.5% PVC, 49.5% TCP, 1% NPBA, and 1% ETH 7075. It showed a linear dynamic range of 10-3 M to 10-1 M, with a detection limit of 9 × 10-4 M and a response time of 2 min. The detection mechanism involves H-bonding between NPBA and glucose, which was confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR). The reaction also involves the formation of boronate esters in basic media with deprotonation of the chromoionophore (ETH 7075), leading to a decrease in UV-Vis absorbance at λmax = 530 nm. The membrane optode was used for glucose determination in synthetic culture medium, commercial embryo culture medium (GLOBAL® TOTAL® W/HEPES), and serum from normal and diabetic patients, showing good accuracy and precision of the optode.
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Affiliation(s)
- Mohamed M. Taha
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
- Adam International Hospital, Aden Street Mohandesein Anas Ibn Malek, Giza 12411, Egypt
| | - Mahmoud S. Rizk
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - Mohamed A. Zayed
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - Fatehy M. Abdel-Haleem
- Chemistry Department, Faculty of Science, Cairo University, Giza 12613, Egypt
- Center for Hazards Mitigation, Environmental Studies and Research (CHMESR), Cairo University, Giza 11795, Egypt
| | - Ahmed Barhoum
- NanoStruc Research Group, Chemistry Department, Faculty of Science, Helwan University, Cairo 11795, Egypt
- National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, D09 V209 Dublin, Ireland
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Abdel-Haleem FM, Rizk MS, El-Beshlawy MM. Molecularly-imprinted polymer-base bulk optode for the determination of ivabradine hydrochloride in Procoralan®. RSC Adv 2022; 12:17645-17654. [PMID: 35765437 PMCID: PMC9198995 DOI: 10.1039/d2ra02064e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 06/08/2022] [Indexed: 11/21/2022] Open
Abstract
IVH may be administered orally twice per day for treating heart failure, sinus rhythm, heart-related chest pain and angina pectoris, and its overdose may cause problems such as blurred vision, uncontrolled blood pressure, prolonged bradycardia, and others. A molecularly imprinted polymer-based bulk optode, miptode, was constructed for the determination of ivabradine hydrochloride (IVH) in its pharmaceutical preparation Procoralan®. The molecularly-imprinted polymers (MIPs) were prepared in different ratios, and MIP3 had the highest imprinting factor (1.6) as an ionophore in the miptode preparation. The miptode was prepared using weight ratios of 30% PVC polymer, 62% nitrophenyl octyl ether (NPOE) plasticizer, 6% MIP3 ionophore, 1% tetraphenyl borate derivative (TPB) ion-exchanger, and 1% ETH7075 chromoionophore; this miptode exhibited an absorbance increase at 530 nm in the concentration range of 10−2–10−5 M with a detection limit of 3.1 μM using Tris–HCl buffer of pH 7.2. The miptode was imaged using AFM, and showed the dissolution of all components except MIP particles which exhibited restricted solubility. However, the incorporation of MIP3 as an ionophore improved the selectivity coefficient over the interfering species that may exist in the pharmaceutical formulation to an extent that was not reported before; e.g. coefficients of IVH over sodium, magnesium, and glucose were improved by 5, 4 and 2 orders, when compared to the previous sensor that operated with the molecular interaction mechanism. The selectivity improvement in miptode is due to the Key-Lock fitting (host-guest molecular recognition) between the MIP particles and the template IVH molecule which is transduced with the ion-exchange process of the chromoionophore. The miptode has a response time of 1–2 minutes, and a reliable lifetime of two months. The miptode was applied successfully for the determination of IVH in the pharmaceutical preparation Procoralan® with recovery values of 89–99.8% with low standard deviations of <1.2. IVH may be administered orally twice per day for treating heart failure, sinus rhythm, heart-related chest pain and angina pectoris; its overdose may cause problems as blurred vision, uncontrolled blood pressure, prolonged bradycardia, and others.![]()
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Affiliation(s)
- Fatehy M Abdel-Haleem
- Chemistry Department, Faculty of Science, Cairo University Giza Egypt .,Center for Hazards Mitigation, Environmental Studies and Research (CHMESR), Cairo University Giza Egypt
| | - Mahmoud S Rizk
- Chemistry Department, Faculty of Science, Cairo University Giza Egypt
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Esaily HA, Serag DM, Rizk MS, Badr IT, Sonbol AA, Fotoh DS. Relationship between cellular communication network factor 1 (CCN1) and carotid atherosclerosis in patients with rheumatoid arthritis. Med J Malaysia 2021; 76:311-317. [PMID: 34031328] [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: 06/12/2023]
Abstract
BACKGROUND The cellular communication network factor 1 (CCN1) is one of the matricellular proteins of the CCN family involved in chronic inflammatory disorders like rheumatoid arthritis (RA) and involved in human atherosclerotic lesions. This study was aimed to assess the levels of serum CCN1 in patients with rheumatoid arthritis (RA), evaluating its relation to carotid intima-media thickness (CIMT) and predisposition to subclinical carotid atherosclerosis and its impact on activity of RA disease. MATERIALS AND METHODS This is a case-control study that included 105 RA patients classified into active and inactive groups according to disease activity score (DAS28) with 50 healthy matched controls. Clinical and laboratory assessments were done including enzyme-linked immunosorbent assay (ELISA) measurement of CCN1 with a bilateral assessment of CIMT using high resolutionultrasonography. Comparison of CCN1 between RA patients and controls, a correlation between CCN1, DAS28, swollen joint count (SJC), tender joint count (TJC), and CIMT were analyzed. RESULTS There was significant elevation of CCN1 in RA patients compared to controls (235.62±62.5 vs. 73.11±18.2, respectively). The cut off value of CCN1 was 99.25 pg/ml, with an area under the curve (AUC) =0.995, p<0.001, 98 % sensitivity and 95% specificity. CCN1 was inversely correlated with DAS28 and its components in both active and inactive RA patients (r=- 0.92, r=- 0.94, p<0.001). CCN1 was inversely correlated with SJC (r= -0.64, r= - 0.67, p<0.001), TJC (r=- 0.56, r= - 0.63, p<0.001), and with Larsen xray score (r=- 0.68, r= - 0.78, p<0.001) in both active and inactive RA patients, respectively. The CCN1 levels in active RA patients were significantly lower than that in patients with low disease activity. A significant positive correlation between CCN1 levels and CIMT in RA patient groups (r=0.88, r=0.47, p<0.001, respectively) was found. CONCLUSION Serum CCN1 could be a helpful biomarker in the diagnosis of RA, associated with RA remission. Disruption of serum CCN1 is engaged in the pathogenesis of atherosclerosis in RA patients which could be a clue for a future treatment strategy of atherosclerosis in RA by controlling CCN1 disruption. Regular follow-up of RA patients is recommended for early detection of subclinical atherosclerosis. New research ideas for controlling CCN1 disruption as new aspects of atherosclerosis treatment in RA patients are needed.
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Affiliation(s)
- H A Esaily
- Menoufia University, Faculty of Medicine, Physical Medicine, Rheumatology and Rehabilitation Department, Egypt
| | - D M Serag
- Menoufia University, Faculty of Medicine, Radiology Department, Egypt
| | - M S Rizk
- Menoufia University, Faculty of Medicine, Medical Biochemistry and Molecular Biology Department, Egypt
| | - I T Badr
- Menoufia University, Faculty of Medicine, Orthopedic Department, Egypt
| | - A A Sonbol
- Menoufia University, Faculty of Medicine, Clinical Pathology Department, Egypt
| | - D S Fotoh
- Menoufia University, Faculty of Medicine, Physical Medicine, Rheumatology and Rehabilitation Department, Egypt.
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Abdel-Haleem FM, Gamal E, Rizk MS, Madbouly A, El Nashar RM, Anis B, Elnabawy HM, Khalil ASG, Barhoum A. Molecularly Imprinted Electrochemical Sensor-Based Fe 2O 3@MWCNTs for Ivabradine Drug Determination in Pharmaceutical Formulation, Serum, and Urine Samples. Front Bioeng Biotechnol 2021; 9:648704. [PMID: 33898405 PMCID: PMC8060449 DOI: 10.3389/fbioe.2021.648704] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Accepted: 03/01/2021] [Indexed: 12/20/2022] Open
Abstract
Ivabradine hydrochloride (IVR) is a medically important drug because of its ability to lower the heart rate. Techniques reported for IVR determination were expensive, laborious, besides being of poor selectivity. In this study, iron oxide @ carbon nanotube (Fe2O3@MWCNTs) nanocomposite and molecularly imprinted polymer (MIP) were synthesized and used in the fabrication of carbon paste electrodes (CPEs) for the potentiometric detection of IVR in biological and pharmaceutical samples. CPEs of the best sensor were formulated from graphite (41 wt%) as a carbon source, MIP (3 wt.%) as an ionophore, Fe2O3@MWCNTs (5 wt%) as a modifier, and nitrophenyl octyl ether (NPOE, 51 wt.%) as a conductive oil so-called plasticizer. The best sensor exhibits a Nernstian slope (response) of 56 mV decade–1 within the IVR concentration range from 1.0 × 10–3 M to 9.8 × 10–8 M with high selectivity against interfering species (ascorbic, maltose, glucose, lactose, dopamine, glycine) over those reported earlier. The use of Fe2O3@MWCNTs together with MIP in the electrode formulation was found to improve the limit of detection (LOD) from 630 to 98 nM along with high reversibility, a short response time of 30 s, and a good lifetime of more than 2 weeks. The sandwich membrane (SMM) method was used to quantify the H-bonding complexing strength of the MIP binding sites for IVR with Log βILn = 11.33. The constructed sensors were successfully applied for the IVR determination in blood serum, urine, and commercial formulations (Savapran®) with high sensitivity.
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Affiliation(s)
- Fatehy M Abdel-Haleem
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.,Cairo University Centre for Environmental Hazards Mitigation, Environmental Studies and Research, CHMESR, Cairo University, Giza, Egypt
| | - Eman Gamal
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Mahmoud S Rizk
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Adel Madbouly
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Rasha M El Nashar
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Badawi Anis
- Spectroscopy Department, National Research Centre, Giza, Egypt
| | - Hussam M Elnabawy
- Environmental and Smart Technology Group (ESTG), Faculty of Science, Fayoum University, Faiyum, Egypt
| | - Ahmed S G Khalil
- Environmental and Smart Technology Group (ESTG), Faculty of Science, Fayoum University, Faiyum, Egypt.,Materials Science and Engineering Department, School of Innovative Design Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Egypt
| | - Ahmed Barhoum
- NanoStruc. Research Group, Chemistry Department, Faculty of Science, Helwan University, Cairo, Egypt.,National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin, Ireland
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Abdel-Haleem FM, Gamal E, Rizk MS, El Nashar RM, Anis B, Elnabawy HM, Khalil ASG, Barhoum A. t-Butyl calixarene/Fe 2O 3@MWCNTs composite-based potentiometric sensor for determination of ivabradine hydrochloride in pharmaceutical formulations. Mater Sci Eng C Mater Biol Appl 2020; 116:111110. [PMID: 32806318 DOI: 10.1016/j.msec.2020.111110] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 05/16/2020] [Accepted: 05/20/2020] [Indexed: 12/31/2022]
Abstract
Ivabradine hydrochloride (IVB) has shown high medical importance as it is a medication for lowering the heart rate for the symptomatic chronic heart failure and symptomatic management of stable angina pectoralis. The high dose of IVB may cause severe and prolonged bradycardia, uncontrolled blood pressure, headache, and blurred vision. In this study, a highly sensitive carbon-paste electrode (CPEs) was constructed for the potentiometric determination of IVB in pharmaceutical formulations. t-Butyl calixarene (t-BCX) was used as an ionophore due to its ability to mask IVB in the cavity via multiple H-bonding at the lower rim, as estimated quantitatively by the sandwich membrane method (Log βILn = 8.62). Besides, the use of multi-walled carbon nanotubes decorated with Fe2O3 nanoparticles (Fe2O3@MWCNTs) as an additive for the paste electrode significantly improved the detection limit of the sensor up to 36 nM, with Nernstian response of 58.9 mV decade-1 in the IVB linear dynamic range of 10-3-10-7 M in aqueous solutions. The constructed sensors showed high selectivity against interfering species that may exist in physiological fluids or pharmaceutical formulations (e.g. Na+, K+, NH4+, Ca2+, Mg2+, Ba2+, Fe3+, Co2+, Cr3+, Sr2+, glucose, lactose, maltose, glycine, dopamine, and ascorbic acid). The sensors were successfully employed for IVB determination in the pharmaceutical formulations (Savapran®).
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Affiliation(s)
- Fatehy M Abdel-Haleem
- Chemistry Department, Faculty of Science, Cairo University, Gamaa Street, Giza 12613, Egypt.
| | - Eman Gamal
- Chemistry Department, Faculty of Science, Cairo University, Gamaa Street, Giza 12613, Egypt
| | - Mahmoud S Rizk
- Chemistry Department, Faculty of Science, Cairo University, Gamaa Street, Giza 12613, Egypt
| | - Rasha M El Nashar
- Chemistry Department, Faculty of Science, Cairo University, Gamaa Street, Giza 12613, Egypt
| | - Badawi Anis
- Spectroscopy Department, Physics Division, National Research Centre, 33 El Bohouth St. (former El Tahrir St.), P.O. 12622 Dokki, Giza, Egypt
| | - Hussam M Elnabawy
- Physics Department, Environmental and Smart Technology Group (ESGT), Faculty of Science, Fayoum University, Fayoum 63514, Egypt
| | - Ahmed S G Khalil
- Physics Department, Environmental and Smart Technology Group (ESGT), Faculty of Science, Fayoum University, Fayoum 63514, Egypt; Materials Science & Engineering Department, School of Innovative Design Engineering, Egypt-Japan University of Science and Technology (E-JUST), 179, New Borg El-Arab City, Alexandria 21934, Egypt
| | - Ahmed Barhoum
- Chemistry Department, Faculty of Science, Helwan University, Ain Helwan, 11795, Cairo, Egypt.
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Abdel‐Haleem FM, Salah A, Rizk MS, Moustafa H, Bechelany M, Barhoum A. Carbon‐based Nanosensors for Salicylate Determination in Pharmaceutical Preparations. ELECTROANAL 2019. [DOI: 10.1002/elan.201800728] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Azza Salah
- Chemistry DepartmentFaculty of ScienceCairo University Gamaa Street Giza 12613 Egypt
| | - Mahmoud S. Rizk
- Chemistry DepartmentFaculty of ScienceCairo University Gamaa Street Giza 12613 Egypt
| | - Hussein Moustafa
- Chemistry DepartmentFaculty of ScienceCairo University Gamaa Street Giza 12613 Egypt
| | - Mikhael Bechelany
- Institut Européen des Membranes, IEM – UMR 5635, ENSCM, CNRS, Univ Montpellier Montpellier France
| | - Ahmed Barhoum
- Institut Européen des Membranes, IEM – UMR 5635, ENSCM, CNRS, Univ Montpellier Montpellier France
- Chemistry Department, Faculty of ScienceHelwan University Helwan 11795 Helwan Egypt
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Abdel-Haleem FM, Saad M, Barhoum A, Bechelany M, Rizk MS. PVC membrane, coated-wire, and carbon-paste ion-selective electrodes for potentiometric determination of galantamine hydrobromide in physiological fluids. Materials Science and Engineering: C 2018; 89:140-148. [DOI: 10.1016/j.msec.2018.04.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 02/18/2018] [Accepted: 04/03/2018] [Indexed: 10/17/2022]
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Abdel-Haleem FM, Rizk MS. Development of ionophore-based nanosphere emulsion incorporating ion-exchanger for complexometric titration of thiocyanate anion. J Adv Res 2017; 8:449-454. [PMID: 28721299 PMCID: PMC5485864 DOI: 10.1016/j.jare.2017.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 06/14/2017] [Accepted: 06/15/2017] [Indexed: 11/30/2022] Open
Abstract
Ionophore-based ion-exchange nanosphere emulsion was prepared and tested for the determination of thiocyanate. The emulsified nanosphere contained the cationic additive tridodecylmethyl ammonium chloride (TDMAC), the plasticizer, and the ionophore Mn(III)-salophen or Mn(III)-salen. This emulsion was used as titrating agent for thiocyanate complexation with ionophores, which could be transduced using an ion-selective electrode (ISE) as an indicator electrode for the end point detection. The method showed no need for pH control and reliable selectivity, as thiocyanate could be determined in presence of other interfering ions with high accuracy. As well, the emulsion was stable and could be used for approximately couple of weeks. The developed emulsion could be used for the determination of thiocyanate in human saliva with standard deviation <4%. In sum, the proposed method could be used as an alternative for the argentometric titration and would open new avenues for the determination of neutral, anionic, and cationic species without necessity for water soluble ligands or pH control.
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Affiliation(s)
| | - Mahmoud S Rizk
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
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Abdel-Haleem FM, Rizk MS. Highly selective thiocyanate optochemical sensor based on manganese(III)-salophen ionophore. Mater Sci Eng C Mater Biol Appl 2017; 75:682-687. [PMID: 28415515 DOI: 10.1016/j.msec.2017.02.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 12/07/2016] [Accepted: 02/21/2017] [Indexed: 11/26/2022]
Abstract
We report on the development of optochemical sensor based on Mn(III)-salophen ionophore. The sensor was prepared by embedding the ionophore in a plasticized poly (vinyl chloride) impregnated with the chromoionophore ETH7075. Optical response to thiocyanate occurred due to thiocyanate extraction into the polymer via formation of strong complex with the ionophore and simultaneous protonation of the indicator dye yielding the optical response at 545nm. The developed optochemical sensor exhibited high selectivity for thiocyanate over other anions including the most lipophilic species such as salicylate and perchlorate. For instance, the optical selectivity coefficients, logKSCN,anionopt, were as follow: ClO4-=-5.8; Sal-=-4.0; NO3-˂-6. Further, the thiocyanate optical selectivity obtained using the present optochemical sensor was greatly enhanced in comparison with that obtained using an anion-exchanger based sensor. Also, the optimized optochemical sensor exhibited micro-molar detection limit with 2min response time at pH4.5 using acetate buffer. The reversibility of the optimized sensor was poor due to strong ligation of the thiocyanate to the central Metal ion, log K=14.1, which can be overcome by soaking the optode in sodium hydroxide followed by soaking in buffer solution. The developed sensor was utilized successfully for the determination of thiocyanate in human saliva and in spiked saliva samples.
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Affiliation(s)
| | - Mahmoud S Rizk
- Chemistry department, Faculty of Science, Cairo university, Giza, Egypt
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Abdel-Haleem FM, Rizk MS, Badr IHA. Potentiometric Determination of Ciprofloxacin in Physiological Fluids Using Carbon Paste and Nano-Composite Carbon Paste Electrodes. ELECTROANAL 2017. [DOI: 10.1002/elan.201600735] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
| | - Mahmoud S. Rizk
- Chemistry Department, Faculty of Science; Cairo University; Giza Egypt
| | - Ibrahim H. A. Badr
- Chemistry Department, Faculty of Science; Ain Shams University; Cairo Egypt
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Shehata AB, Rizk MS, Rend EA. Certification of caffeine reference material purity by ultraviolet/visible spectrophotometry and high-performance liquid chromatography with diode-array detection as two independent analytical methods. J Food Drug Anal 2016; 24:703-715. [PMID: 28911607 PMCID: PMC9337290 DOI: 10.1016/j.jfda.2016.06.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Revised: 05/26/2016] [Accepted: 06/14/2016] [Indexed: 11/29/2022] Open
Abstract
Caffeine reference material certified for purity is produced worldwide, but no research work on the details of the certification process has been published in the literature. In this paper, we report the scientific details of the preparation and certification of pure caffeine reference materials. Caffeine was prepared by extraction from roasted and ground coffee by dichloromethane after heating in deionized water mixed with magnesium oxide. The extract was purified, dried, and bottled in dark glass vials. Stratified random selection was applied to select a number of vials for homogeneity and stability studies, which revealed that the prepared reference material is homogeneous and sufficiently stable. Quantification of caffeine purity % was carried out using a calibrated UV/visible spectrophotometer and a calibrated high-performance liquid chromatography with diode-array detection method. The results obtained from both methods were combined to drive the certified value and its associated uncertainty. The certified value of the reference material purity was found to be 99.86% and its associated uncertainty was ±0.65%, which makes the candidate reference material a very useful calibrant in food and drug chemical analysis.
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Affiliation(s)
- A B Shehata
- Reference Materials Department, National Institute of Standards, El-Matbah, Haram, Giza, Egypt.
| | - M S Rizk
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
| | - E A Rend
- Reference Materials Department, National Institute of Standards, El-Matbah, Haram, Giza, Egypt
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Shehata AB, Rizk MS, Farag AM, Tahoun IF. Development of two reference materials for all trans-retinol, retinyl palmitate, α- and γ-tocopherol in milk powder and infant formula. J Food Drug Anal 2015; 23:82-92. [PMID: 28911449 PMCID: PMC9351743 DOI: 10.1016/j.jfda.2014.10.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 10/20/2014] [Accepted: 10/22/2014] [Indexed: 11/24/2022] Open
Abstract
Vitamins are important food constituents that can be present in almost every foodstuff. Food quality and safety depends on food surveillance by reliable quantitative analysis enabled by appropriate quality control. Certified matrix reference materials are versatile tools to support quality assurance and control. However, in the case of vitamins, which are important in various foods, there is a lack of matrix reference materials. Two certified reference materials for the determination of all–trans-retinol, retinyl palmitate, and α- and γ-tocopherol in milk powder and infant formula have been developed by the National Institute of Standards, Egypt. This article presents the preparation, characterization, homogeneity, and stability testing as well as statistical treatment of data and certified value assignment. The assignment of the certified values and associated uncertainties in the prepared natural-matrix reference materials were based on the widely used approach of combining data from independent and reliable analytical methods.
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15
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Abdel-Ghani NT, Rizk MS, Mostafa M. Extractive determination of ephedrine hydrochloride and bromhexine hydrochloride in pure solutions, pharmaceutical dosage form and urine samples. Spectrochim Acta A Mol Biomol Spectrosc 2013; 111:131-141. [PMID: 23624039 DOI: 10.1016/j.saa.2013.03.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 02/22/2013] [Accepted: 03/03/2013] [Indexed: 06/02/2023]
Abstract
Simple, rapid, sensitive, precise and accurate spectrophotometeric methods for the determination of ephedrine hydrochloride (E-HCl) and bromhexine hydrochloride (Br-HCl) in bulk samples, dosage form and in spiked urine samples were investigated. The methods are based on the formation of a yellow colored ion-associates due to the interaction between the examined drugs with picric acid (PA), chlorophyllin coppered trisodium salt (CLPH), alizarin red (AR) and ammonium reineckate (Rk) reagents. A buffer solution had been used and the extraction was carried out using organic solvent, the ion associates exhibit absorption maxima at 410, 410, 430 and 530 nm of (Br-HCl)with PA, CLPH, AR and Rk respectively; 410, 410, 435 and 530 of (E-HCl) with PA, CLPH, AR and Rk respectively. (E-HCl) and (Br-HCl) could be determined up to 13, 121, 120 and 160; 25, 200, 92 and 206 μg mL(-1), using PA, CLPH, AR and Rk respectively. The optimum reaction conditions for quantitative analysis were investigated. In addition, the molar absorptivity, Sandell sensitivity were determined for the investigated drug. The correlation coefficient was ≥0.995 (n=6) with a relative standard deviation (RSD) ≤1.15 for five selected concentrations of the reagents. Therefore the concentration of Br-HCl and E-HCl drugs in their pharmaceutical formulations and spiked urine samples had been determined successfully.
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Affiliation(s)
- N T Abdel-Ghani
- Chemistry Department, Faculty of Science, Cairo University, Egypt.
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16
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Abchee AB, Yaacoub CI, Rizk MS, Ayoub CM. A new device for easier handling of the transoesophageal echocardiography probe. Anaesthesia 2004; 59:192. [PMID: 14725527 DOI: 10.1111/j.1365-2044.2003.03637.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Ayoub CM, Letayf AM, Rizk MS. Pump activated by a foot switch pedal for controlled administration of local anaesthetic drugs. Anaesthesia 2002; 57:833; author reply 833-4. [PMID: 12133107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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18
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Baraka AS, Taha SK, Rizk MS, Rachid-Chehab I, Jalbout MI, Bizri SH. Rapacuronium for neuromuscular blockade in two myasthenic patients undergoing trans-sternal thymectomy. Eur J Anaesthesiol 2001; 18:778-80. [PMID: 11580788 DOI: 10.1046/j.1365-2346.2001.0914a.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Abdel-Ghani NT, Rizk MS, El-Nashar RM. Salbutamol plastic membrane electrodes based on individual and mixed ion-exchangers of salbutamolium phosphotungstate and phosphomolybdate. Analyst 2000. [DOI: 10.1039/b000861n] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Abstract
Direct current and differential pulse polarography DPP were used for the determination of three penicillins, namely, ampicillin, benzylpenicillin and carbenicillin, in pure form and in their dosage forms. The method is based upon treatment of penicillins with nitrous acid followed by polarographic measurement of the produced derivatives polarographically. The nitroso derivatives formed exhibited reduction waves over the whole pH range in Britton-Robinson buffers. The waves were characterized as being diffusion-controlled and free from adsorption phenomena. The current-concentration plots were rectilinear over the concentration range 8-200 and 2-160 micrograms ml-1 for DCt and DPP, respectively, for all the studied compounds. The proposed method was further applied to determine penicillins in pharmaceutical preparations, and the results obtained were in good agreement with those given by the companies.
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Affiliation(s)
- F Belal
- Faculty of Pharmacy, Department of Analytical Chemistry, University of Mansoura, Egypt
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21
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Shoukry AF, Rizk MS, Issa YM, Atia EM. Extraction-spectrophotometric determination of amprolium hydrochloride using bromocresol green, bromophenol blue and bromothymol blue. Mikrochim Acta 1997. [DOI: 10.1007/bf01242734] [Citation(s) in RCA: 9] [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: 11/27/2022]
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22
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Abo-Ellil MS, El-Kader FHA, Ahmed MA, Rizk MS. Investigation of electrical transport in ethylene diamene tetrachloride metal complexes. Phys Scr 1996; 53:108-112. [DOI: 10.1088/0031-8949/53/1/021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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23
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24
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Gaafar SA, El-Kader FHA, Rizk MS. Changes in the structure of poly (vinyl alcohol)-CrCl 3composites irradiated by low level fast neutron doses. Phys Scr 1994; 49:366-370. [DOI: 10.1088/0031-8949/49/3/019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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25
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Rizk MS, Belal F, Eid MM. Conductometric determination of some pharmaceutically important thiol compounds in dosage forms. Acta Pharm Hung 1993; 63:313-8. [PMID: 8116451] [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: 01/28/2023]
Abstract
A direct semimicro conductometric method is described for the determination of five pharmaceutically-important thiol compounds, namely: N-acetylcysteine, captopril, D-penicillamine, 6-mercaptopurine and thioguanine, in bulk and in dosage forms. The method involves the use of lead nitrate as a titrant in aqueous medium with conductometric detection of the end point. The proposed method was successfully applied to the determination of the studied compounds and the results obtained were found to agree with those given using the official methods. The proposed method is simple, accurate and precise.
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Affiliation(s)
- M S Rizk
- Department of Analytical Chemistry, Faculty of Pharmacy, University of Mansoura, Egypt
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26
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Rizk MS, Belal F, Eid MM. 2-Iodoxybenzoate as a titrant for the determination of some pharmaceutically-important thiol compounds. Acta Pharm Hung 1993; 63:13-8. [PMID: 8452030] [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: 01/30/2023]
Abstract
A simple and reliable method was developed for the determination of five pharmaceutical compounds containing thiol group; namely: N-acetylcysteine, D-penicillamine, 6-mercaptopurine, captopril and thioguanine. The method is based on the use of 2-iodoxybenzoate as a titrant in acid medium. The detection of the end point is accomplished potentiometrically, using platinum/calomel electrode combination. For all the studied compounds, the stoichiometry of the reaction was found to be 2:3 suggesting that, the thiol group is oxidised to the corresponding sulphonic acid. This finding was confirmed through TLC study of the reaction products. The proposed method was successfully applied to the determination of the studied compounds in dosage forms and the results were in good agreement with those given using the official methods.
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Affiliation(s)
- M S Rizk
- Department of Analytical Chemistry, Faculty of Pharmacy, University of Mansoura, Egypt
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27
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Abstract
A simple gas chromatographic procedure has been developed for the determination of methyltestosterone in bulk powders and in tablets. Two new silyl ether derivatives of methyltestosterone have been prepared using dimethylethylsilylimidazole (DMESI) and dimethylisopropylsilylimidazole (DMiPSI). The method is accurate and selective for methyltestosterone within the concentration range 0.1-1.5 micrograms microliters-1.
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Affiliation(s)
- N A Zakhari
- Department of Analytical Chemistry, Faculty of Pharmacy, University of Mansoura, Egypt
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28
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Rizk MS, Zakhari NA. 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone as a redox titrant. Farmaco Prat 1986; 41:75-82. [PMID: 3699144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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29
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Walash MI, Rizk MS, Ibrahim FA. DC polarographic assay of piperazines. J Assoc Off Anal Chem 1985; 68:532-4. [PMID: 4019381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Piperazine, piperazine salts, and piperazine-containing compounds, e.g., diethylcarbamazine and piperazine theophylline, are determined by direct current polarography of the corresponding nitroso-derivative. The nitroso-derivative exhibits a well defined cathodic wave at -0.8 V vs SCE. The plot of peak height vs concentration is rectilinear between 1.6 X 10(-5) and 19.2 X 10(-5) M. Recoveries from bulk drugs were 97.7-101.12% with a standard deviation of 2.14-3.44. The procedure was successfully applied to analysis of drug content in representative dosage forms with good accuracy.
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30
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Abdel-Magied SA, Abo-Shady AF, Abou-Zkham A, Rizk MS, Farag FM. Counterimmunoelectrophoresis, a rapid diagnostic test for extra-intestinal amoebiasis. J Egypt Soc Parasitol 1984; 14:109-13. [PMID: 6736690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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31
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Abdel-Magied SA, Abo-Shady AF, Ali MM, Ali MM, Rizk MS. Counterimmunoelectrophoresis and circumoval precipitin tests in serodiagnosis of schistosomiasis mansoni. J Egypt Soc Parasitol 1984; 14:173-7. [PMID: 6736698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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32
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Rizk MS, Walash MI, El-Brashy A. Colorimetric determination of acetylenic hypnotics by formation of silver acetylides. J Assoc Off Anal Chem 1980; 63:88-90. [PMID: 7380797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A colorimetric method is described for the determination of certain mono-substituted acetylenic hypnotic drugs--ethinamate, methyl pentnol carbamate, and ethchlorvynol. Silver acetylide is formed and extracted into isobutyl methyl ketone. After acidification, an equivalent amount of silver ions is liberated which is assayed colorimetrically as silver dithizonate (lambda mx. 472 nm). About 10--50 microgram compound could be assayed with good accuracy. The procedure is reproducible and precise (standard deviation 1.5--2.19%). The procedure was successfully applied to different pharmaceutical dosage forms.
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Abou-Ouf AM, Walash MI, Rizk MS, Ibrahim FA. Spectrophotometric determination of piperazine and its salts in pharmaceuticals. J Assoc Off Anal Chem 1979; 62:1138-40. [PMID: 528460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A spectrophotometric determination of piperazine and some of its salts is described. The method depends on the UV measurement of the N-nitroso derivatives formed by the interaction of piperazine with nitrous acid. The chromophore is developed by heating the reaction mixture at 80 degrees C for 15 min, at pH 2.3--2.6. Beer's law is obeyed in the range 1--15 micrograms/mL.
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