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Iyer J, Brunsteiner M, Ray A, Davis A, Saraf I, Paudel A. Theoretical and Experimental Investigation of Autoxidation Propensity of Selected Drugs in Solution State. Mol Pharm 2023; 20:1768-1778. [PMID: 36757102 DOI: 10.1021/acs.molpharmaceut.2c00967] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
The C-H bond dissociation energy (BDE) of drug molecules is often used to estimate their relative propensities to undergo autoxidation. BDE calculations based on electronic structures provide a convenient means to estimate the risk for a given compound to degrade via autoxidation. This study aimed to verify the utility of calculated C-H BDEs of a range of drug molecules in predicting their autoxidation propensities, in the solution state. For the autoxidation study, 2,2'-azobis (2-methylpropionitrile) was employed as the solution state stressor, and the experimental reaction rate constants were determined employing ultraperformance liquid chromatographic (UPLC) methods. Reaction rates in the solution state were compared to the calculated C-H BDE values of the respective compounds. The results indicated a poor correlation for compounds in the solution state, and their relative stabilities could not be explained with C-H BDE. On the other hand, a favorable relationship was observed between the relative extent of ionization and the autoxidation rates of the selected compounds. In the solution state, factors such as the type and extent of drug ionization, degree and type of solvation have been shown to contribute to differences in reactivity. By applying the computational method involving the effect of H-atom abstraction and potential ionization sites in the molecule, the calculated C-H BDE should relate better to the experimental autoxidation rates.
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Affiliation(s)
- Jayant Iyer
- Research Center Pharmaceutical Engineering GmbH (RCPE), Graz 8010, Austria
| | | | - Andrew Ray
- Dew Modalities Product Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Macclesfield SK10 2NA, United Kingdom
| | - Adrian Davis
- Pfizer Worldwide Research and Development, Sandwich, Kent CT13 9NJ, United Kingdom
| | - Isha Saraf
- Research Center Pharmaceutical Engineering GmbH (RCPE), Graz 8010, Austria
| | - Amrit Paudel
- Research Center Pharmaceutical Engineering GmbH (RCPE), Graz 8010, Austria.,Graz University of Technology, Institute of Process and Particle Engineering, Graz 8010, Austria
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2
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UPLC Technique in Pharmacy—An Important Tool of the Modern Analyst. Processes (Basel) 2022. [DOI: 10.3390/pr10122498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
In recent years, ultra-efficient liquid chromatography (UPLC) has gained particular popularity due to the possibility of faster separation of small molecules. This technique, used to separate the ingredients present in multi-component mixtures, has found application in many fields, such as chemistry, pharmacy, food, and biochemistry. It is an important tool in both research and production. UPLC created new possibilities for analytical separation without reducing the quality of the obtained results. This technique is therefore a milestone in liquid chromatography. Thanks to the increased resolution, new analytical procedures, in many cases, based on existing methods, are being developed, eliminating the need for re-analysis. Researchers are trying to modify and transfer the analytical conditions from the commonly used HPLC method to UPLC. This topic may be of strategic importance in the analysis of medicinal substances. The information contained in this manuscript indicates the importance of the UPLC technique in drug analysis. The information gathered highlights the importance of selecting the appropriate drug control tools. We focused on drugs commonly used in medicine that belong to various pharmacological groups. Rational prescribing based on clinical pharmacology is essential if the right drug is to be administered to the right patient at the right time. The presented data is to assist the analyst in the field of broadly understood quality control, which is very important, especially for human health and treatment. This manuscript shows that the UPLC technique is now an increasingly used tool for assessing the quality of drugs and determining the identity and content of active substances. It also allows the monitoring of active substances and finished products during their processing and storage.
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3
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Çelebier M. Ultrafiltration-based Sample Preparation for Pharmaceutical Analysis. CURR PHARM ANAL 2021. [DOI: 10.2174/1573412916999200729172653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Pharmaceutical analysis plays an important role in all steps of drug development processes.
Analysis of active pharmaceutical ingredients in biological samples needs sample preparation techniques
to prevent the signal of the analyte from interferences coming from matrix components. Ultrafiltration
is a well-known technique used in the food and pharmaceutical industry. Commercial ultrafiltration
devices have been frequently used on proteomics and metabolomics studies for sample preparation.
In pharmaceutical analysis, these devices have been employed to analyze the free concentration of
drugs in biological fluids after filtration. However, they have been rarely used to determine the total
concentration of targeted compounds when it is compared with some other common sample preparation
techniques. Ultrafiltration-based sample preparation might be used to clean-up the sample easily
from matrix components especially on bioanalysis performed with high-performance liquid chromatography
(HPLC). In the case of using protein precipitation agents on filtration procedure, the quantitative
recovery of this non-selective unique technique is competitive with solid-phase extraction.
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Affiliation(s)
- Mustafa Çelebier
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
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Bacil RP, de O. Marcondes Filho EA, de A. Dias K, Portes MC, de Araujo WR, Oliveira-Silva D, dos Santos AA, Serrano SH. The chemical interaction between the neurotransmitter dopamine and the antipsychotic drugs olanzapine and quetiapine. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2020.114946] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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5
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Katakam LNR, Dongala T, Ettaboina SK. Novel stability indicating UHPLC method development and validation for simultaneous quantification of hydrocortisone acetate, pramoxine hydrochloride, potassium sorbate and sorbic acid in topical cream formulation. TALANTA OPEN 2020. [DOI: 10.1016/j.talo.2020.100004] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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6
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Zheng Y, Peng Q, Dong R, Chen T, Bao Y, Peng Q, Yang M. Simultaneous Determination of Methocarbamol and Paracetamol in the Presence of Three Related Substances by Ultra Performance Liquid Chromatography. CURR PHARM ANAL 2019. [DOI: 10.2174/1573412914666180702150357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Introduction:A rapid, and accurate Ultra Performance Liquid Chromatography (UPLC) method was developed to simultaneously analyze Methocarbamol, Paracetamol and the related substancesMaterials and Methods:Waters ACQUITY UPLC® BEH Phenyl C18 column was used in conjunction with UV detection at 225nm. Gradient elution with 0.05M, pH 6 phosphate buffer and acetonitrile flow at 0.3mL /min rate were used to separate the substances. The retention times for 4-Aminopheno, Paracetamol, Guaifenesin, Methocarbamol, and 4-Chloroacetanilide were 1.319 minute, 2.224 minute, 4.467 minute, 4.769 minute and 5.433 minute respectively. The concentration was linear in the range of 2-100 µg/ml for Methocarbamol, and 1-100 µg/mL for Paracetamol. The percentage recoveries were between 99.28±1.23% to 100.57±0.99% for Methocarbamol, and between 99.08±1.23% to 101.23±1.39% for Paracetamol.Results and Discussion:The validated optimal protocol is robust and accurate for simultaneous analysis of Methocarbamol, Paracetamol and the related substances, applicable for bulk powder as well as pharmaceutical formulation.Conclusion:In this paper, a highly sensitive, accurate, and precise UPLC method with UV-Vis detection was developed and validated for quality control of MET and PAR in bulk as well as in pharmaceutical preparations.
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Affiliation(s)
- Yanjuan Zheng
- School of Pharmaceutical Sciences, Guizhou University, Guiyang 550025, China
| | - Qiushi Peng
- School of Pharmaceutical Sciences, Guizhou University, Guiyang 550025, China
| | - Rui Dong
- Technology Center, China Tobacco Guizhou Industrial Co., Ltd., Guizhou 550009, China
| | - Tingyu Chen
- School of Pharmaceutical Sciences, Guizhou University, Guiyang 550025, China
| | - Yi Bao
- School of Pharmaceutical Sciences, Guizhou University, Guiyang 550025, China
| | - Qianrong Peng
- Technology Center, China Tobacco Guizhou Industrial Co., Ltd., Guizhou 550009, China
| | - Min Yang
- School of Pharmaceutical Sciences, Guizhou University, Guiyang 550025, China
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7
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Testa CG, Prado LD, Costa RN, Costa ML, Linck YG, Monti GA, Cuffini SL, Rocha HVA. Challenging identification of polymorphic mixture: Polymorphs I, II and III in olanzapine raw materials. Int J Pharm 2018; 556:125-135. [PMID: 30543891 DOI: 10.1016/j.ijpharm.2018.12.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 11/13/2018] [Accepted: 12/02/2018] [Indexed: 10/27/2022]
Abstract
Olanzapine (OLZ), a drug for the treatment of schizophrenia, presents in more than 60 crystal forms. Polymorphs I, II and III were reported, however, the preparation conditions for pure II and III have not been reported. Polymorph IV was reported but this form is actually polymorph II described at different temperature. The diversity of solid forms of OLZ, the change in the nomenclature found in the literature and the presence of polymorphic mixture in samples, increase the difficulty for a correct solid state characterization. Therefore, the goal was the polymorphic identification of three OLZ raw materials, highlighting the limitation of conventional techniques (typically used in analytical control) and the necessity to use a combination of advanced ones to solve this challenge. The samples were studied by conventional techniques such as powder X-ray diffraction, thermoanalytical techniques, infrared spectroscopy. In apart from that, synchrotron powder X-ray diffraction (SPXRD) and solid state nuclear magnetic resonance (ss-NMR) were used. All samples were in accordance with the pharmacopoeia criteria. However, the conventional techniques were not specific for the complete polymorphic identification. Therefore, a combination of advanced techniques (SPXRD and ss-NMR) was necessary to identify the mixture of polymorphs (I, II and III) in all samples.
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Affiliation(s)
- Carla G Testa
- Laboratório Farmacêutico da Marinha, Av. Dom Hélder Câmara, 315, 20911-291 Rio de Janeiro, Brazil; Mestrado Profissional em Gestão, Pesquisa e Desenvolvimento na Indústria Farmacêutica, Farmanguinhos/Fiocruz, Av. Cmte. Guaranys, 447, 22775-903 Rio de Janeiro, Brazil
| | - Livia D Prado
- Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Outeiro São João Batista, s/n°, 24210-130 Niterói, Brazil; Laboratório de Micro e Nanotecnologia, Farmanguinhos/Fiocruz, Av. Brasil, 4036, 21040-361 Rio de Janeiro, Brazil.
| | - Rogéria N Costa
- Programa de Pós-Graduação em Engenharia e Ciência de Materiais, Universidade Federal de São Paulo, Rua Talim 330, 12231-280 São José dos Campos, Brazil
| | - Michelle L Costa
- Departamento de Materiais e Tecnologia, Universidade Estadual Paulista, Av. Dr. Ariberto Pereira da Cunha, 333, 12516-410 Guaratinguetá, Brazil
| | - Yamila G Linck
- Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Medina Allende, Ciudad Universitaria, X5000HUA Córdoba, Argentina; Instituto de Fisica Enrique Gaviola, Consejo Nacional de Investigaciones Científicas y Técnicas, Medina Allende, Ciudad Universitaria, X5016LAE Córdoba, Argentina
| | - Gustavo A Monti
- Facultad de Matemática, Astronomía, Física y Computación, Universidad Nacional de Córdoba, Medina Allende, Ciudad Universitaria, X5000HUA Córdoba, Argentina; Instituto de Fisica Enrique Gaviola, Consejo Nacional de Investigaciones Científicas y Técnicas, Medina Allende, Ciudad Universitaria, X5016LAE Córdoba, Argentina
| | - Silvia L Cuffini
- Programa de Pós-Graduação em Engenharia e Ciência de Materiais, Universidade Federal de São Paulo, Rua Talim 330, 12231-280 São José dos Campos, Brazil
| | - Helvécio V A Rocha
- Mestrado Profissional em Gestão, Pesquisa e Desenvolvimento na Indústria Farmacêutica, Farmanguinhos/Fiocruz, Av. Cmte. Guaranys, 447, 22775-903 Rio de Janeiro, Brazil; Laboratório de Micro e Nanotecnologia, Farmanguinhos/Fiocruz, Av. Brasil, 4036, 21040-361 Rio de Janeiro, Brazil
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8
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Zhuang T, Zhang W, Cao L, He K, Wang Y, Li J, Chen L, Liu B, Zhang G. Isolation, identification and characterization of two novel process-related impurities in olanzapine. J Pharm Biomed Anal 2018; 152:188-196. [DOI: 10.1016/j.jpba.2018.01.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 12/26/2017] [Accepted: 01/15/2018] [Indexed: 10/18/2022]
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9
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Quality by Design in the development of hydrophilic interaction liquid chromatography method with gradient elution for the analysis of olanzapine. J Pharm Biomed Anal 2017; 134:18-26. [DOI: 10.1016/j.jpba.2016.11.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 10/19/2016] [Accepted: 11/09/2016] [Indexed: 11/18/2022]
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10
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Trawiński J, Skibiński R. Studies on photodegradation process of psychotropic drugs: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:1152-1199. [PMID: 27696160 PMCID: PMC5306312 DOI: 10.1007/s11356-016-7727-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 09/15/2016] [Indexed: 05/10/2023]
Abstract
Consumption of psychotropic drugs is still increasing, especially in high-income countries. One of the most crucial consequences of this fact is significant release of them to the environment. Considerable amounts of atypical antipsychotics, benzodiazepines, antidepressants, and their metabolites were detected in river, lake, and sea water, as well as in tissues of aquatic organisms. Their ecotoxicity was proved by numerous studies. It should be noticed that interaction between psychotropic pharmaceuticals and radiation may lead to formation of potentially more toxic intermediates. On the other hand, photo-assisted wastewater treatment methods can be used as an efficient way to eliminate them from the environment. Many methods based on photolysis and photocatalysis were proposed and developed recently; nevertheless, the problem is still unsolved. However, according to recent studies, photocatalysis could be considered as the most promising and far more effective than regular photolysis. An overview on photolytic as well as homogenous and heterogeneous photocatalytic degradation methods with the use of various catalysts is presented. The photostability and phototoxicity of pharmaceuticals were also discussed. Various analytical methods were used for the photodegradation research, and this issue was also compared and summarized. Use of high-resolution multistage mass spectrometry (Q-TOF, ion trap, Orbitrap) was suggested. The combined techniques such as LC-MS, GC-MS, and LC-NMR, which enable qualitative and quantitative analyses in one run, proved to be the most valuable in this case. Assembling of MS/MS spectra libraries of drug molecules and their phototransformation products was identified as the future challenge.
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Affiliation(s)
- Jakub Trawiński
- Department of Medicinal, Medical University of Lublin, Jaczewskiego 4, 20-090, Lublin, Poland.
| | - Robert Skibiński
- Department of Medicinal, Medical University of Lublin, Jaczewskiego 4, 20-090, Lublin, Poland
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11
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Development and validation of a novel stability-indicating HPLC method for the quantitative determination of eleven related substances in ezetimibe drug substance and drug product. Talanta 2015; 139:67-74. [DOI: 10.1016/j.talanta.2015.02.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2014] [Revised: 02/17/2015] [Accepted: 02/20/2015] [Indexed: 11/18/2022]
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12
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Farzaneh S, Asadi E, Abdouss M, Barghi-Lish A, Azodi-Deilami S, Khonakdar HA, Gharghabi M. Molecularly imprinted polymer nanoparticles for olanzapine recognition: application for solid phase extraction and sustained release. RSC Adv 2015. [DOI: 10.1039/c4ra12725k] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The aim of this study was to prepare efficient imprinted polymer nanoparticles from an olanzapine template for the controlled release of olanzapine as a therapeutic drug for CNS diseases.
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Affiliation(s)
- Sina Farzaneh
- Department of Polymer Engineering
- South Tehran Branch, Islamic Azad University Tehran
- Iran 1777613651
| | - Ebadullah Asadi
- Department of Chemistry
- Amirkabir University of Technology
- Tehran
- Iran
| | - Majid Abdouss
- Department of Chemistry
- Amirkabir University of Technology
- Tehran
- Iran
| | - Azam Barghi-Lish
- Department of Chemistry
- Faculty of Sciences
- Islamic Azad University, Rasht Branch
- Rasht
- Iran
| | | | | | - Mehdi Gharghabi
- Department of Toxicology-Pharmacology
- School of Pharmacy
- Tehran University of Medical Sciences
- Tehran
- Iran
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Shahrokhian S, Azimzadeh M, Hosseini P. Modification of a glassy carbon electrode with a bilayer of multiwalled carbon nanotube/benzene disulfonate-doped polypyrrole: application to sensitive voltammetric determination of olanzapine. RSC Adv 2014. [DOI: 10.1039/c4ra04584j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Hussien LAEA, Ghani MFA, El-Alamein AMA, Mohamed EH. Stability-indicating methods for the determination of olanzapine in presence of its degradation products. ACTA ACUST UNITED AC 2014. [DOI: 10.5155/eurjchem.5.2.311-320.951] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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15
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Vallapragada VV, Inti G, Vidiyala SR, Jadi S. Validated UPLC Method for Determination of Unbound Bile Acids in Colesevelam HCl Tablets. J Chromatogr Sci 2014; 53:154-60. [DOI: 10.1093/chromsci/bmu032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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Djordjević Filijović N, Antonijević MD, Pavlović A, Vučković I, Nikolić K, Agbaba D. The stress stability of olanzapine: studies of interactions with excipients in solid state pharmaceutical formulations. Drug Dev Ind Pharm 2014; 41:502-14. [PMID: 24611817 DOI: 10.3109/03639045.2014.884114] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Stress stability testing represents an important part of the drug development process. It is used as an important tool for the identification of degradation products and degradation pathways, as well as for the assessment of changes in physical form of drug molecules. The impact of excipients on the stability of olanzapine confirms that levels of impurities and degradants are limiting parameters and are therefore used for stability evaluation. The major degradation product of olanzapine was identified as 2-methyl-5,10-dihydro-4H-thieno[2,3-b][1,5]benzodiazepine-4-one (III). The structure of III was determined by using LC-MS, IR and NMR. Compatibility and stress stability results demonstrated that tablet formulations of olanzapine are sensitive to temperature and moisture. In samples protected from moisture, the increase in concentration of III was shown to be highly temperature dependent and the degradation followed zero-order kinetics. In addition, studies of olanzapine with excipients and in formulated tablets revealed polymorphic phase changes in some samples, influenced by a combination of stress temperature and humidity conditions. Polymorphic transitions were monitored using x-ray powder diffraction (XRPD) analysis and exhibited no correlation between the phase change (appearance of a new polymorph) and the degradation process.
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Forced degradation and impurity profiling: Recent trends in analytical perspectives. J Pharm Biomed Anal 2013; 86:11-35. [DOI: 10.1016/j.jpba.2013.07.013] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Revised: 06/28/2013] [Accepted: 07/07/2013] [Indexed: 11/23/2022]
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Gumustas M, Kurbanoglu S, Uslu B, Ozkan SA. UPLC versus HPLC on Drug Analysis: Advantageous, Applications and Their Validation Parameters. Chromatographia 2013. [DOI: 10.1007/s10337-013-2477-8] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Cielecka-Piontek J, Zalewski P, Jelińska A, Garbacki P. UHPLC: The Greening Face of Liquid Chromatography. Chromatographia 2013; 76:1429-1437. [PMID: 24273332 PMCID: PMC3825615 DOI: 10.1007/s10337-013-2434-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2012] [Revised: 12/22/2012] [Accepted: 02/14/2013] [Indexed: 01/05/2023]
Abstract
Pharmaceutical analysis based on chromatographic separation is an important part of studies aimed at developing routine quality analysis of drugs. High-performance liquid chromatography (HPLC) is one of the main analytical techniques recommended for drug analysis. Although it meets many criteria vital for analysis, it is time-consuming and uses a relatively high amount of organic solvents compared to other analytical techniques. Recently, Ultra-high-performance liquid chromatography (UHPLC) has been frequently proposed as an alternative to HPLC, which means introducing an environment-friendly approach to drug analysis achieved by reducing the consumption of solvents. It also offers greater chromatographic resolution and higher sensitivity as well as requiring less time due to faster analysis. This review focuses on the basics of UHPLC, compares that technique with HPLC and discusses the possibilities of applying UHPLC for the analysis of different pharmaceuticals and biopharmaceuticals.
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Affiliation(s)
- Judyta Cielecka-Piontek
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznan, Poland
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Quantitative analysis of olanzapine in rat brain microdialysates by HPLC–MS/MS coupled with column-switching technique. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 905:127-32. [DOI: 10.1016/j.jchromb.2012.07.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2011] [Revised: 06/17/2012] [Accepted: 07/25/2012] [Indexed: 01/16/2023]
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Malati V, Krishnaiah C, Reddy AR, Mukkanti K, Suryanarayana MV. QUANTIFICATION OF 2-((2-METHOXY PHENOXY) METHYL) OXIRANE, ITS PROCESS RELATED IMPURITIES AND REGIO ISOMERS BY RAPID AND SENSITIVE ULTRA PERFORMANCE LIQUID CHROMATOGRAPHIC METHOD. J LIQ CHROMATOGR R T 2012. [DOI: 10.1080/10826076.2011.619045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Vakamulla Malati
- a Analytical Research and Process Development, Integrated Product Development Operations, Dr. Reddy's Laboratories Ltd, Bachupalli , Qutubullapur , Andhra Pradesh , India
- b Center for Chemical Science and Technology, Institute of Science and Technology, J. N. T. University, Kukatpally , Hyderabad , Andhra Pradesh , India
| | - Ch. Krishnaiah
- a Analytical Research and Process Development, Integrated Product Development Operations, Dr. Reddy's Laboratories Ltd, Bachupalli , Qutubullapur , Andhra Pradesh , India
| | - Anumala Raghupati Reddy
- a Analytical Research and Process Development, Integrated Product Development Operations, Dr. Reddy's Laboratories Ltd, Bachupalli , Qutubullapur , Andhra Pradesh , India
| | - K. Mukkanti
- b Center for Chemical Science and Technology, Institute of Science and Technology, J. N. T. University, Kukatpally , Hyderabad , Andhra Pradesh , India
| | - M. V. Suryanarayana
- c Matrix Laboratories Limited, Anrich Industrial Estate, Bollaram , Jinnaram (Mandal) , Andhra Pradesh , India
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Karpińska J, Sokół A, Bernatowicz A, Szulęcka A, Kotowska U. Studies on photodegradation of levomepromazine and olanzapine under simulated environmental conditions. Photochem Photobiol Sci 2012; 11:1575-84. [DOI: 10.1039/c2pp25068c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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