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Mohamed Shenger MS, Filipic S, Nikolic K, Agbaba D. ESTIMATION OF LIPOPHILICITY AND RETENTION BEHAVIOR OF SOME ALPHA ADRENERGIC AND IMIDAZOLINE RECEPTOR LIGANDS USING RP-TLC. J LIQ CHROMATOGR R T 2014. [DOI: 10.1080/10739149.2014.906880] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Nikolic K, Filipic S, Smoliński A, Kaliszan R, Agbaba D. Partial least square and hierarchical clustering in ADMET modeling: prediction of blood-brain barrier permeation of α-adrenergic and imidazoline receptor ligands. JOURNAL OF PHARMACY AND PHARMACEUTICAL SCIENCES 2014; 16:622-47. [PMID: 24210068 DOI: 10.18433/j3jk5p] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
PURPOSE. Rate of brain penetration (logPS), brain/plasma equilibration rate (logPS-brain), and extent of blood-brain barrier permeation (logBB) of 29 α-adrenergic and imidazoline-receptors ligands were examined in Quantitative-Structure-Property Relationship (QSPR) study. METHODS. Experimentally determined chromatographic retention data (logKw at pH 4.4, slope (S) at pH 4.4, logKw at pH 7.4, slope (S) at pH 7.4, logKw at pH 9.1, and slope (S) at pH 9.1) and capillary electrophoresis migration parameters (μeff at pH 4.4, μeff at pH 7.4, and μeff at pH 9.1), together with calculated molecular descriptors, were used as independent variables in the QSPR study by use of partial least square (PLS) methodology. RESULTS. Predictive potential of the formed QSPR models, QSPR(logPS), QSPR(logPS-brain), QSPR(logBB), was confirmed by cross- and external validation. Hydrophilicity (Hy) and H-indices (H7m) were selected as significant parameters negatively correlated with both logPS and logPS-brain, while topological polar surface area (TPSA(NO)) was chosen as molecular descriptor negatively correlated with both logPS and logBB. The principal component analysis (PCA) and hierarchical clustering analysis (HCA) were applied to cluster examined drugs based on their chromatographic, electrophoretic and molecular properties. Significant positive correlations were obtained between the slope (S) at pH 7.4 and logBB in A/B cluster and between the logKw at pH 9.1 and logPS in C/D cluster. CONCLUSIONS. Results of the QSPR, clustering and correlation studies could be used as novel tool for evaluation of blood-brain barrier permeation of related α-adrenergic/imidazoline receptor ligands.This article is open to POST-PUBLICATION REVIEW. Registered readers (see "For Readers") may comment by clicking on ABSTRACT on the issue's contents page.PURPOSE. Rate of brain penetration (logPS), brain/plasma equilibration rate (logPS-brain), and extent of blood-brain barrier permeation (logBB) of 29 α-adrenergic and imidazoline-receptors ligands were examined in Quantitative-Structure-Property Relationship (QSPR) study. METHODS. Experimentally determined chromatographic retention data (logKw at pH 4.4, slope (S) at pH 4.4, logKw at pH 7.4, slope (S) at pH 7.4, logKw at pH 9.1, and slope (S) at pH 9.1) and capillary electrophoresis migration parameters (μeff at pH 4.4, μeff at pH 7.4, and μeff at pH 9.1), together with calculated molecular descriptors, were used as independent variables in the QSPR study by use of partial least square (PLS) methodology. RESULTS. Predictive potential of the formed QSPR models, QSPR(logPS), QSPR(logPS-brain), QSPR(logBB), was confirmed by cross- and external validation. Hydrophilicity (Hy) and H-indices (H7m) were selected as significant parameters negatively correlated with both logPS and logPS-brain, while topological polar surface area (TPSA(NO)) was chosen as molecular descriptor negatively correlated with both logPS and logBB. The principal component analysis (PCA) and hierarchical clustering analysis (HCA) were applied to cluster examined drugs based on their chromatographic, electrophoretic and molecular properties. Significant positive correlations were obtained between the slope (S) at pH 7.4 and logBB in A/B cluster and between the logKw at pH 9.1 and logPS in C/D cluster. CONCLUSIONS. Results of the QSPR, clustering and correlation studies could be used as novel tool for evaluation of blood-brain barrier permeation of related α-adrenergic/imidazoline receptor ligands. This article is open to POST-PUBLICATION REVIEW. Registered readers (see "For Readers") may comment by clicking on ABSTRACT on the issue's contents page.
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Nikolic K, Filipic S, Agbaba D, Stark H. Procognitive properties of drugs with single and multitargeting H3 receptor antagonist activities. CNS Neurosci Ther 2014; 20:613-23. [PMID: 24836924 DOI: 10.1111/cns.12279] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 04/07/2014] [Accepted: 04/07/2014] [Indexed: 01/01/2023] Open
Abstract
The histamine H3 receptor (H3 R) is an important modulator of numerous central control mechanisms. Novel lead optimizations for H3 R antagonists/inverse agonists involved studies of structure-activity relationships, cross-affinities, and pharmacokinetic properties of promising ligands. Blockade of inhibitory histamine H3 autoreceptors reinforces histaminergic transmission, while antagonism of H3 heteroreceptors accelerates the corticolimbic liberation of acetylcholine, norepinephrine, glutamate, dopamine, serotonin and gamma-aminobutyric acid (GABA). The H3 R positioned at numerous neurotransmission crossroads indicates therapeutic applications of small-molecule H3 R modulators in a number of psychiatric and neurodegenerative diseases with various clinical candidates available. Dual target drugs displaying H3 R antagonism/inverse agonism with inhibition of acetylcholine esterase (AChE), histamine N-methyltransferase (HMT), or serotonin transporter (SERT) are novel class of procognitive agents. Main chemical diversities, pharmacophores, and pharmacological profiles of procognitive agents acting as H3 R antagonists/inverse agonists and dual H3 R antagonists/inverse agonists with inhibiting activity on AChE, HMT, or SERT are highlighted here.
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Filipic B, Nikolic K, Filipic S, Jovcic B, Agbaba D, Antic Stankovic J, Kojic M, Golic N. Identifying the CmbT substrates specificity by using a quantitative structure–activity relationship (QSAR) study. J Taiwan Inst Chem Eng 2014. [DOI: 10.1016/j.jtice.2013.09.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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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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Djordjević Filijović N, Pavlović A, Nikolić K, Agbaba D. Validation of an HPLC method for determination of aripiprazole and its impurities in pharmaceuticals. ACTA CHROMATOGR 2014. [DOI: 10.1556/achrom.26.2014.1.15] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Bautista-Aguilera OM, Esteban G, Bolea I, Nikolic K, Agbaba D, Moraleda I, Iriepa I, Samadi A, Soriano E, Unzeta M, Marco-Contelles J. Design, synthesis, pharmacological evaluation, QSAR analysis, molecular modeling and ADMET of novel donepezil-indolyl hybrids as multipotent cholinesterase/monoamine oxidase inhibitors for the potential treatment of Alzheimer's disease. Eur J Med Chem 2014; 75:82-95. [PMID: 24530494 DOI: 10.1016/j.ejmech.2013.12.028] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 12/11/2013] [Accepted: 12/22/2013] [Indexed: 01/21/2023]
Abstract
The design, synthesis, and pharmacological evaluation of donepezil-indolyl based amines 7-10, amides 12-16, and carboxylic acid derivatives 5 and 11, as multipotent ASS234 analogs, able to inhibit simultaneously cholinesterase (ChE) and monoamine oxidase (MAO) enzymes for the potential treatment of Alzheimer's disease (AD), is reported. Theoretical studies using 3D-Quantitative Structure-Activity Relationship (3D-QSAR) was used to define 3D-pharmacophores for inhibition of MAO A/B, AChE, and BuChE enzymes. We found that, in general, and for the same substituent, amines are more potent ChE inhibitors (see compounds 12, 13 versus 7 and 8) or equipotent (see compounds 14, 15 versus 9 and 10) than the corresponding amides, showing a clear EeAChE inhibition selectivity. For the MAO inhibition, amides were not active, and among the amines, compound 14 was totally MAO A selective, while amines 15 and 16 were quite MAO A selective. Carboxylic acid derivatives 5 and 11 showed a multipotent moderate selective profile as EeACE and MAO A inhibitors. Propargylamine 15 [N-((5-(3-(1-benzylpiperidin-4-yl)propoxy)-1-methyl-1H-indol-2-yl)methyl)prop-2-yn-1-amine] resulted in the most potent hMAO A (IC50 = 5.5 ± 1.4 nM) and moderately potent hMAO B (IC50 = 150 ± 31 nM), EeAChE (IC50 = 190 ± 10 nM), and eqBuChE (IC50 = 830 ± 160 nM) inhibitor. However, the analogous N-allyl and the N-morpholine derivatives 16 and 14 deserve also attention as they show an attractive multipotent profile. To sum up, donepezil-indolyl hybrid 15 is a promising drug for further development for the potential prevention and treatment of AD.
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Gagic Z, Ivkovic B, Nikolic K, Agbaba D. Application of thin layer and column chromatography in monitoring the synthesis of α- tocopheryl-lysine ester. ARHIV ZA FARMACIJU 2014. [DOI: 10.5937/arhfarm1403261g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
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Nikolic K, Filijović ND, Maričić B, Agbaba D. Development of a novel RP-HPLC method for the efficient separation of aripiprazole and its nine impurities. J Sep Sci 2013; 36:3165-75. [DOI: 10.1002/jssc.201300477] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 06/25/2013] [Accepted: 07/21/2013] [Indexed: 11/11/2022]
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Topić V, Filipić S, Popović G, Nikolić K, Agbaba D. TLC DETERMINATION OF GLIMEPIRIDE AND ITS MAIN IMPURITIES IN PHARMACEUTICALS. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2013.790767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Nikolic K, Agbaba D. Pharmacophore development and SAR studies of imidazoline receptor ligands. Mini Rev Med Chem 2013; 12:1542-55. [PMID: 22512575 DOI: 10.2174/138955712803832636] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Revised: 02/27/2012] [Accepted: 03/01/2012] [Indexed: 11/22/2022]
Abstract
Relationship between biological responses and binding affinities at I(1)/I(2)/I(3) imidazoline receptors of compounds with imidazoline, pyrroline or oxazoline moieties was studied by 2D-QSAR, 3D-QSAR and quantitative pharmacophore development approaches. Since the I(1) imidazoline receptor is involved in central inhibition of sympathicus that produce hypotensive effect, the I(2) receptor is allosteric modulator of monoamine oxidase B (MAO-B) and the I(3) receptor regulates insulin secretion from pancreatic β-cells, design and synthesis of selective I(1)/I(2)/I(3) imidazoline ligands are very important for the development of new effective therapeutic agents. New agonists and antagonists with high selectivity for I(1)/I(2)/I(3) imidazoline receptor classes have been recently synthesized and examined. The present review will highlight the main chemical diversity and pharmacophore features of selective I(1)/I(2)/I(3) imidazoline receptor ligands.
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Nikolic K, Veljkovic N, Gemovic B, Srdic-Rajic T, Agbaba D. Imidazoline-1 Receptor Ligands as Apoptotic Agents: Pharmacophore Modeling and Virtual Docking Study. Comb Chem High Throughput Screen 2013; 16:298-319. [DOI: 10.2174/1386207311316040004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2012] [Revised: 01/04/2013] [Accepted: 01/21/2013] [Indexed: 11/22/2022]
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Filipic S, Nikolic K, Vovk I, Krizman M, Agbaba D. Quantitative structure-mobility relationship analysis of imidazoline receptor ligands in CDs-mediated CE. Electrophoresis 2013; 34:471-82. [DOI: 10.1002/elps.201200171] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Revised: 08/16/2012] [Accepted: 09/15/2012] [Indexed: 11/05/2022]
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Radulović V, Aleksić MM, Agbaba D, Kapetanović V. An Electroanalytical Approach to Brimonidine at Boron Doped Diamond Electrode Based on Its Extensive Voltammetric Study. ELECTROANAL 2012. [DOI: 10.1002/elan.201200400] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Nikolic K, Pavlovic M, Smolinski A, Agbaba D. The Chemometric Study and Quantitative Structure Retention Relationship Modeling of Liquid Chromatography Separation of Ziprasidone Components. Comb Chem High Throughput Screen 2012; 15:730-44. [DOI: 10.2174/138620712803519699] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 04/27/2012] [Accepted: 04/30/2012] [Indexed: 11/22/2022]
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Nikolic K, Filipic S, Agbaba D. Multi-Target QSAR and Docking Study of Steroids Binding to Corticosteroid-Binding Globulin and Sex Hormone-Binding Globulin. Curr Comput Aided Drug Des 2012; 8:296-308. [DOI: 10.2174/157340912803519642] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 05/30/2011] [Accepted: 11/08/2011] [Indexed: 11/22/2022]
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Savic IM, Nikolic K, Nikolic G, Savic I, Agbaba D, Cakic M. Application of mathematical modeling for the development and optimization formulation with bioactive copper complex. Drug Dev Ind Pharm 2012; 39:1084-90. [DOI: 10.3109/03639045.2012.707208] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Djekic L, Primorac M, Filipic S, Agbaba D. Investigation of surfactant/cosurfactant synergism impact on ibuprofen solubilization capacity and drug release characteristics of nonionic microemulsions. Int J Pharm 2012; 433:25-33. [DOI: 10.1016/j.ijpharm.2012.04.070] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 04/24/2012] [Accepted: 04/25/2012] [Indexed: 10/28/2022]
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Savic IM, Nikolic GS, Savic IM, Katarina N, Agbaba D. Development and optimization of formulation for treatment of copper deficiency in human organism. ACTA POLONIAE PHARMACEUTICA 2012; 69:739-749. [PMID: 22876618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The aim of this study was to design and optimize a new tablet formulation for treatment of copper deficiency in human organism by using an experimental design. The new no-veneered tablets, prepared by a wet granulation technique, are containg active substance, a copper(II) complex with polysaccharide pullulan. The binder concentration, the disintegrant concentration and the resistance to crushing were used as independent variables in the formulation, while in vitro measured drug release characteristics of the tablets was response variable in a full factorial design 2(3) modeling. A cubic model for data fitted was used to examine the obtained results. They showed that the resistance to crushing has the most significant effect on copper(II) complex release from the formulation, while the disintegrant concentration has smaller influence on dissolution profile of copper(II) complex and the binder concentration had minor impact in this study. Lower value of resistance to crushing has influence on better dissolution profile. Furthermore, physical characteristics of the tablets were evaluated, viz., drug content, hardness, thickness, friability, disintegration time, mass variation, particle size and size distribution.
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Ranković K, Filipić S, Nikolić K, Agbaba D. TLC DETERMINATION OF TIAPRIDE HYDROCHLORIDE AND ITS IMPURITIES IN PHARMACEUTICALS. J LIQ CHROMATOGR R T 2012. [DOI: 10.1080/10826076.2012.675870] [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]
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Antic D, Filipic S, Ivkovic B, Nikolic K, Agbaba D. Direct separation of clopidogrel enantiomers by reverse-phase planar chromatography method using β-cyclodextrin as a chiral mobile phase additive. ACTA CHROMATOGR 2011. [DOI: 10.1556/achrom.23.2011.2.4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Agbaba D, Malenovic A. New Methods for Drug Analysis in Biological Samples and Other Matrixes. J AOAC Int 2011. [DOI: 10.1093/jaoac/94.3.665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Vovk I, Popović G, Simonovska B, Albreht A, Agbaba D. Ultra-thin-layer chromatography mass spectrometry and thin-layer chromatography mass spectrometry of single peptides of angiotensin-converting enzyme inhibitors. J Chromatogr A 2011; 1218:3089-94. [DOI: 10.1016/j.chroma.2011.03.039] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Revised: 03/14/2011] [Accepted: 03/16/2011] [Indexed: 11/30/2022]
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Agbaba D, Malenovic A. New methods for drug analysis in biological samples and other matrixes. J AOAC Int 2011; 94:665-666. [PMID: 21796995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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Pavlovic M, Malesevic M, Nikolic K, Agbaba D. Development and validation of an HPLC method for determination of ziprasidone and its impurities in pharmaceutical dosage forms. J AOAC Int 2011; 94:713-722. [PMID: 21796998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Ziprasidone is known as a novel "atypical" or "second-generation" antipsychotic drug. A sensitive and reproducible method was developed and validated for determination of ziprasidone and its major impurities, which are significantly different in polarity. The separation is performed on a Waters Spherisorb octadecylsilyl 1 column (5.0 microm particle size, 250 x 4.6 mm id) using a gradient with mobile phase A [buffer-acetonitrile (80+20, v/v)] and mobile phase B [buffer-acetonitrile (10+90, v/v)] at a working temperature of 25 degrees C. The buffer was 0.05 M KH2PO4 solution with an addition of 10 mL triethylamine/L solution, adjusted to pH 2.5 with orthophosphoric acid. The flow rate was 1.5 mL/min, and the eluate was monitored at 250 nm using a diode array detector. Optimization of the experimental conditions was performed using partial least squares regression, for which four factors were selected for optimization: buffer concentration, buffer pH, triethylamine concentration, and temperature. The proposed validated method is convenient and reliable for the assay and purity control in both raw materials and dosage forms.
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