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A Comparative Study between Screen-Printed and Solid-Contact Electrodes for the Stability-Indicating Determination of Bromazepam. Molecules 2022; 27:molecules27217616. [DOI: 10.3390/molecules27217616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/29/2022] [Accepted: 11/02/2022] [Indexed: 11/09/2022] Open
Abstract
Stability-indicating methods are awesome tools to ensure the safety and efficacy of active pharmaceutical ingredients (APIs). An accurate comparative study involving the use of potentiometric sensors for the determination of bromazepam (BRZ) in the presence of its main product of degradation and impurity was performed by the fabrication of two membrane electrodes. A screen-printed electrode (SPE) and a solid-contact glassy carbon electrode (SCE) were fabricated and their performance optimized. The fabricated sensors showed a linear electrochemical response in the concentration range 1.0 × 10−6 M to 1.0 × 10−2 M. The electrodes exhibited Nernstian slopes of 59.70 mV/decade and 58.10 mV/decade for the BRZ-SPE and BRZ-SCE membrane electrodes, respectively. The electrochemical performance was greatly affected by the medium pH. They showed an almost ideal electrochemical performance between pH 3.0 and pH 6.0. The fabricated membranes were applied successfully for the quantification of BRZ in the presence of up to 90% of its degradation product. Moreover, a successful application of the fabricated electrodes was performed for the sensitive and selective quantification of BRZ in its tablet form without any pretreatment procedure.
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Potentiometric Sensors for the Selective Determination of Benzodiazepine Drug Residues in Real Wastewater Effluents. CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10020074] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The application of ion-selective electrodes (ISEs) in the detection and determination of environmental pollutants has become a very important mission in the last few years. Two selective and sensitive membrane electrodes were fabricated in the laboratory and intended to evaluate the electrochemical response of bromazepam (BRZ) using phosphotungstic acid (PTA) and sodium tetraphenylborate (TPB) as ion pairing agents. The linearity range of the fabricated electrodes was between 1 × 10−6 M to 1 × 10−3 M. Nernstian slopes of 54 mV/decade and 57 mV/decade were obtained for the BRZ-PTA and BRZ-TPB membrane electrodes, respectively. The performance of the fabricated membranes was optimum in the pH range of 3–6. Optimum electrochemical response was attained through the careful adjustment of all assay settings. The cited method was successfully applied for the selective determination of BRZ in either its pure form or real wastewater samples obtained from a pharmaceutical industrial plant. The main core of novelty in the suggested method lies in the application of the membranes for the sensitive, selective, and economic determination of BRZ in real wastewater effluents without the tedious sample pretreatment procedures. This can make the suggested method considered an eco-friendly method, as it minimizes the use of organic solvents and chemicals used in the pretreatment process.
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Darwish HW, Ali NA, Naguib IA, El Ghobashy MR, Al-Hossaini AM, Abdelrahman MM. Development and validation of a stability indicating RP-HPLC-DAD method for the determination of bromazepam. PLoS One 2021; 16:e0244951. [PMID: 33690658 PMCID: PMC7946308 DOI: 10.1371/journal.pone.0244951] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 12/19/2020] [Indexed: 11/20/2022] Open
Abstract
A reliable, selective and sensitive stability-indicating RP-HPLC assay was established for the quantitation of bromazepam (BMZ) and one of the degradant and stated potential impurities; 2-(2-amino-5-bromobenzoyl) pyridine (ABP). The assay was accomplished on a C18 column (250 mm × 4.6 mm i.d., 5 μm particle size), and utilizing methanol-water (70: 30, v/v) as the mobile phase, at a flow rate of 1.0 ml min-1. HPLC detection of elute was obtained by a photodiode array detector (DAD) which was set at 230 nm. ICH guidelines were adhered for validation of proposed method regarding specificity, sensitivity, precision, linearity, accuracy, system suitability and robustness. Calibration curves of BMZ and ABP were created in the range of 1-16 μg mL-1 with mean recovery percentage of 100.02 ± 1.245 and 99.74 ± 1.124, and detection limit of 0.20 μg mL-1 and 0.24 μg mL-1 respectively. BMZ stability was inspected under various ICH forced degradation conditions and it was found to be easily degraded in acidic and alkaline conditions. The results revealed the suitability of the described methodology for the quantitation of the impurity (ABP) in a BMZ pure sample. The determination of BMZ in pharmaceutical dosage forms was conducted with the described method and showed mean percentage recovery of 99.39 ± 1.401 and 98.72 ± 1.795 (n = 6), respectively. When comparing the described procedure to a reference HPLC method statistically, no significant differences between the two methods in regard to both accuracy and precision were found.
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Affiliation(s)
- Hany W. Darwish
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi Arabia
- Faculty of Pharmacy, Analytical Chemistry Department, Cairo University, Cairo, Egypt
| | - Nesma A. Ali
- Analytical Toxicology Laboratory, Forensic Medicine Authority, Justice Ministry, El Sayeda Zeinab, Cairo, Egypt
| | - Ibrahim A. Naguib
- Department of Pharmaceutical Chemistry, College of Pharmacy, Taif University, Taif, Saudi Arabia
| | - Mohamed R. El Ghobashy
- Faculty of Pharmacy, Analytical Chemistry Department, Cairo University, Cairo, Egypt
- Faculty of Pharmacy, October 6 University, October 6 city, Giza, Egypt
| | - Abdullah M. Al-Hossaini
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Maha M. Abdelrahman
- Faculty of Pharmacy, Pharmaceutical Analytical Chemistry Department, Beni-Suef University, Beni-Suef, Egypt
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Darwish HW, A Ali N, Naguib IA, El Ghobashy MR, Al-Hossaini AM, Abdelrahman MM. Stability indicating spectrophotometric methods for quantitative determination of bromazepam and its degradation product. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 238:118433. [PMID: 32403074 DOI: 10.1016/j.saa.2020.118433] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/27/2020] [Accepted: 04/27/2020] [Indexed: 06/11/2023]
Abstract
Four simple, sensitive and selective stability indicating spectrophotometric methods are presented for quantitative determination of the benzodiazepine drug; bromazepam (BMZ) and one of its reported potential impurities and degradation product; 2-(2-amino-5-bromobenzoyl) pyridine (ABP) in methanol. Method A, is isoabsorptive point coupled with D0 method, where good linearity was obtained by measuring the absorbance of BMZ at 264 nm (Aiso) in the concentration range of 2-25 μg mL-1, and the absorbance of ABP at its λmax 396 nm in concentration range of 0.5-24 μg mL-1. Method B, is ratio subtraction; the absorbance was measured at 233 nm for BMZ using 20 μg mL-1 of ABP, while ABP was determined directly at its λmax 396 nm using methanol as a solvent. Method C, was based on measuring the total peak amplitude of the first derivative of the ratio spectra (DD1) of BMZ from 301 to 326 nm using 10 μg mL-1 of ABP as a divisor and determination of ABP at peak amplitude of 293 nm using 5 μg mL-1 of BMZ as a divisor. In method D, ratio difference method, good linearity was achieved for determination of BMZ and ABP by measuring the differences between the amplitudes of ratio spectra at 312 nm and 274 nm and differences between the amplitudes of ratio spectra at 274 nm and 312 nm, respectively. The stability of BMZ was investigated under different ICH recommended forced degradation conditions. The suggested methods were then successfully applied for determination of BMZ in its pharmaceutical formulations.
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Affiliation(s)
- Hany W Darwish
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia; Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., Cairo 11562, Egypt
| | - Nesma A Ali
- Toxicology Laboratory, Forensic Medicine Authority, Justice Ministry,114 Bairam El Tounsy St., El Sayeda Zeinab, 11647 Cairo, Egypt
| | - Ibrahim A Naguib
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., 62514 Beni-Suef, Egypt; Department of Pharmaceutical Chemistry, College of Pharmacy, Taif University, Al-Hawiah 21974, Taif, Saudi Arabia.
| | - Mohamed R El Ghobashy
- Analytical Chemistry Department, Faculty of Pharmacy, Cairo University, Kasr El-Aini St., Cairo 11562, Egypt; Faculty of Pharmacy, October 6 University, October 6 City, Giza, Egypt
| | - Abdullah M Al-Hossaini
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Maha M Abdelrahman
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., 62514 Beni-Suef, Egypt
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Xie L, Beyer S, Vogel V, Wacker MG, Mäntele W. Assessing the drug release from nanoparticles: Overcoming the shortcomings of dialysis by using novel optical techniques and a mathematical model. Int J Pharm 2015; 488:108-19. [DOI: 10.1016/j.ijpharm.2015.03.080] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 03/30/2015] [Accepted: 03/31/2015] [Indexed: 12/21/2022]
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Determination of Quinine and Doxycycline in Rat Plasma by LC–MS–MS: Application to a Pharmacokinetic Study. Chromatographia 2011. [DOI: 10.1007/s10337-011-1949-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Benzodiazepines: sample preparation and HPLC methods for their determination in biological samples. Bioanalysis 2011; 1:755-84. [PMID: 21083137 DOI: 10.4155/bio.09.43] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Benzodiazepines (BDZs) belong to a group of substances known for their sedative, antidepressive, muscle relaxant, tranquilizer, hypnotic and anticonvulsant properties. Their determination in biological fluids is essential in clinical assays as well as in forensics and toxicological studies. Researchers focus on the development of rapid, accurate, precise and sensitive methods for the determination of BDZs and their metabolites. A large number of analytical methods using different techniques have been reported, but none can be considered as the method of choice. BDZs are usually present at trace levels (microgram or nanogram per milliliter) in a complex biological matrix and the potentially interfering compounds must be isolated by various extraction techniques before analysis. An extended and comprehensive review is presented herein, focusing on sample preparation (pretreatment and extraction) and HPLC conditions applied by different authors. These methods enable bioanalysts to achieve detection limits down to 1-2 ng/ml using UV/diode array detection, readily available in most laboratories, and better than 1 ng/ml using electron capture detection, which is lower than that obtained using a nitrogen phosphorus detector. MS interfaced with electrospray ionization offered a similar sensitivity, while negative chemical ionization MS or sonic spray ionization MS provided sensitivity down to 0.1 ng/ml.
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Nakamura M. Analyses of benzodiazepines and their metabolites in various biological matrices by LC-MS(/MS). Biomed Chromatogr 2011; 25:1283-307. [DOI: 10.1002/bmc.1598] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Revised: 11/15/2010] [Accepted: 11/23/2010] [Indexed: 01/01/2023]
Affiliation(s)
- Mitsuhiro Nakamura
- Laboratory of Drug Informatics; Gifu Pharmaceutical University; 1-25-4, daigaku-nishi; Gifu; 501-1196; Japan
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Albu F, Georgita C, Tache F, Mutihac L, Medvedovici A, David V. Considerations on MS/MS Detection of Bromazepam after Liquid Chromatographic Separation from Plasma Samples: Application to a Bioequivalence Study. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070701560603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Florin Albu
- a S. C. Labormed Pharma S.A. , Bucharest, Romania
| | | | - Florentin Tache
- b Faculty of Chemistry, Department of Analytical Chemistry , University of Bucharest , Bucharest, Romania
| | - Lucia Mutihac
- b Faculty of Chemistry, Department of Analytical Chemistry , University of Bucharest , Bucharest, Romania
| | - Andrei Medvedovici
- b Faculty of Chemistry, Department of Analytical Chemistry , University of Bucharest , Bucharest, Romania
| | - Victor David
- b Faculty of Chemistry, Department of Analytical Chemistry , University of Bucharest , Bucharest, Romania
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