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Cousein E, Mareville J, Lerooy A, Caillau A, Labreuche J, Dambre D, Odou P, Bonte JP, Puisieux F, Decaudin B, Coupé P. Effect of automated drug distribution systems on medication error rates in a short-stay geriatric unit. J Eval Clin Pract 2014; 20:678-84. [PMID: 24917185 PMCID: PMC4524418 DOI: 10.1111/jep.12202] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/14/2014] [Indexed: 11/28/2022]
Abstract
RATIONALE, AIMS AND OBJECTIVES To assess the impact of an automated drug distribution system on medication errors (MEs). METHODS Before-after observational study in a 40-bed short stay geriatric unit within a 1800 bed general hospital in Valenciennes, France. Researchers attended nurse medication administration rounds and compared administered to prescribed drugs, before and after the drug distribution system changed from a ward stock system (WSS) to a unit dose dispensing system (UDDS), integrating a unit dose dispensing robot and automated medication dispensing cabinet (AMDC). RESULTS A total of 615 opportunities of errors (OEs) were observed among 148 patients treated during the WSS period, and 783 OEs were observed among 166 patients treated during the UDDS period. ME [medication administration error (MAE)] rates were calculated and compared between the two periods. Secondary measures included type of errors, seriousness of errors and risk reduction for the patients. The implementation of an automated drug dispensing system resulted in a 53% reduction in MAEs. All error types were reduced in the UDDS period compared with the WSS period (P<0.001). Wrong dose and wrong drug errors were reduced by 79.1% (2.4% versus 0.5%, P=0.005) and 93.7% (1.9% versus 0.01%, P=0.009), respectively. CONCLUSION An automated UDDS combining a unit dose dispensing robot and AMDCs could reduce discrepancies between ordered and administered drugs, thus improving medication safety among the elderly.
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Affiliation(s)
- Etienne Cousein
- Department of Biopharmacy, Galenic and Hospital Pharmacy, EA GRIIOT, UDSL, Université Lille Nord de FranceLille, France
- Department of Pharmacy, Valenciennes General HospitalValenciennes, France
| | - Julie Mareville
- Department of Pharmacy, Valenciennes General HospitalValenciennes, France
| | - Alexandre Lerooy
- Geriatric Short Stay Unit, Valenciennes General HospitalValenciennes, France
| | - Antoine Caillau
- Geriatric Short Stay Unit, Valenciennes General HospitalValenciennes, France
| | - Julien Labreuche
- Department of Biostatistics, UDSL, Université Lille Nord de FranceLille, France
| | - Delphine Dambre
- Geriatric Short Stay Unit, Valenciennes General HospitalValenciennes, France
| | - Pascal Odou
- Department of Biopharmacy, Galenic and Hospital Pharmacy, EA GRIIOT, UDSL, Université Lille Nord de FranceLille, France
- Department of Pharmacy, University Hospital of LilleCHU Lille, Lille, France
| | - Jean-Paul Bonte
- Department of Analytical Chemistry, EA GRIIOT, UDSL, Université Lille Nord de FranceLille, France
| | - François Puisieux
- Geriatric Department, University Hospital of LilleLille, France
- Laboratory for the Biology of Vascular Aging, UFR Médecine, Université Lille Nord de FranceLille, France
| | - Bertrand Decaudin
- Department of Biopharmacy, Galenic and Hospital Pharmacy, EA GRIIOT, UDSL, Université Lille Nord de FranceLille, France
- Department of Pharmacy, University Hospital of LilleCHU Lille, Lille, France
| | - Patrick Coupé
- Department of Pharmacy, Valenciennes General HospitalValenciennes, France
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Lecoeur M, Vérones V, Vaccher C, Bonte JP, Lebegue N, Goossens JF. Structural elucidation of degradation products of a benzopyridooxathiazepine under stress conditions using electrospray orbitrap mass spectrometry – Study of degradation kinetic. Eur J Pharm Sci 2012; 45:559-69. [DOI: 10.1016/j.ejps.2011.12.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 11/14/2011] [Accepted: 12/05/2011] [Indexed: 10/14/2022]
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Lecoeur M, Goossens JF, Vaccher C, Bonte JP, Foulon C. A multivariate approach for the determination of isoelectric point of human carbonic anhydrase isoforms by capillary isoelectric focusing. Electrophoresis 2011; 32:2857-66. [DOI: 10.1002/elps.201100219] [Citation(s) in RCA: 16] [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] [Received: 04/13/2011] [Revised: 05/09/2011] [Accepted: 05/11/2011] [Indexed: 01/11/2023]
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Stern E, Goossens L, Retailleau P, Kauffmann B, Bonte JP, Depreux P, Goossens JF. Preparative enantiomeric separation of new selective CB2 receptor agonists by liquid chromatography on polysaccharide-based chiral stationary phases: Determination of enantiomeric purity and assignment of absolute stereochemistry by X-ray structure analys. Chirality 2011; 23:389-96. [DOI: 10.1002/chir.20939] [Citation(s) in RCA: 4] [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] [Received: 04/02/2010] [Accepted: 12/09/2010] [Indexed: 11/09/2022]
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Lipka E, Folly-Klan M, Charton J, Vaccher MP, Bonte JP, Vaccher C. Determination of pKa values of benzimidazole derivatives from mobility obtained by capillary electrophoresis. J Pharm Biomed Anal 2010; 53:1267-71. [DOI: 10.1016/j.jpba.2010.07.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Revised: 07/08/2010] [Accepted: 07/18/2010] [Indexed: 10/19/2022]
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Garofalo A, Goossens L, Baldeyrou B, Lemoine A, Ravez S, Six P, David-Cordonnier MH, Bonte JP, Depreux P, Lansiaux A, Goossens JF. Design, synthesis, and DNA-binding of N-alkyl(anilino)quinazoline derivatives. J Med Chem 2010; 53:8089-103. [PMID: 21033670 DOI: 10.1021/jm1009605] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
New N-alkylanilinoquinazoline derivatives 5, 12, 20, and 22 have been prepared from 4-chloro-6,7-dimethoxyquinazoline 3, 4-chloro-6,7-methylenedioxyquinazoline 19, and commercially available anilines. Differents classes of compounds substituted by an aryloxygroup (6a-c, 16a,b, and 17a,b), (aminophenyl)ureas (12a,b and 13a-f), anilines (4a-m, 20a,b), N-alkyl(aniline) (5a-m, 21a,b, 22a,d), and N-aminoalkyl(aniline) (22e-g) have been synthesized. These molecules were evaluated for their cytotoxic activities and as potential DNA intercalating agents. We studied the strength and mode of binding to DNA of these molecules by DNA melting temperature measurements, fluorescence emission, and circular dichroism. The results of various spectral and gel electrophoresis techniques obtained with the different compounds, in particular compounds 5g and 22f, revealed significant DNA interaction. These experiments confirm that the N-aminoalkyl(anilino)-6,7-dimethoxyquinazoline nucleus is an efficient pharmacophore to trigger binding to DNA, via an intercalative binding process.
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Lipka E, Vaccher MP, Vaccher C, Bonte JP. Chiral Capillary Electrophoresis with Highly Sulfated Cyclodextrins; Resolution of Benzoxazolinone Aminoalcohols, and Aminoketon Precursors, Potential Adrenergic Ligands. ANAL LETT 2010. [DOI: 10.1080/00032711003717448] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lecerf JM, Luc G, Marecaux N, Bal S, Bonte JP, Lacroix B, Borgies B. Une faible variation qualitative des apports en acides gras diminue le cholestérol LDL de sujets hypercholestérolémiques gardant des apports lipidiques élevés. ACTA ACUST UNITED AC 2010. [DOI: 10.1051/mnut/2005414165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Cabordery AC, Toussaint M, Bonte JP, Melnyk P, Vaccher C, Foulon C. Separation of Tic-hydantoin enantiomers, potent sigma-1 agonists, by high performance liquid chromatography and capillary electrophoresis. J Chromatogr A 2010; 1217:3871-5. [PMID: 20451916 DOI: 10.1016/j.chroma.2010.04.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Revised: 03/26/2010] [Accepted: 04/08/2010] [Indexed: 11/21/2022]
Abstract
Stereospecific separations of seven Tic-hydantoin sigma-1 agonists were performed by both HPLC method using derivatized cellulose and amylose chiral stationary phases and capillary electrophoresis (CE) method using neutral and anionic cyclodextrins added in the background electrolyte (BGE). An optimal baseline separation (R(s)>3.3 with analysis times<25min) was readily obtained with all silica-based celluloses and amyloses using a normal-phase methodology. CE was used as an alternative technique to HPLC for the Tic-hydantoin derivatives separation. The enantiomers were fully resolved with highly sulfated beta-cyclodextrins at pH 2.5 (R(s)>1.5 with analysis times <11min). Both methods were validated in terms of linearity, detection and quantification limits. They were used to check the enantiomeric purity of the enantiomers.
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Affiliation(s)
- A C Cabordery
- UDSL, UFR Pharmacie,Laboratoire de Chimie Analytique, EA 4034, F-59000 Lille, France
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Lipka E, Danel C, Yous S, Bonte JP, Vaccher C. Dual CD system in capillary electrophoresis for direct separation of the four stereoisomers of agonist and antagonist melatoninergic ligands. Electrophoresis 2010; 31:1529-32. [DOI: 10.1002/elps.200900661] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Andrzejak V, Millet R, Bakali J, Guelzim A, Gluszok S, Chavatte P, Bonte JP, Vaccher C, Lipka E. Synthesis of 2,3 and 4,5-Dihydro-hydroxy-isoxazoles and Isoxazoles Under Different pH Conditions. LETT ORG CHEM 2010. [DOI: 10.2174/157017810790533922] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Lipka E, Vaccher C, Bonte JP. Enantioseparation of benzoxazolinone aminoalcohols and their aminoketone precursors, potential adrenergic ligands, by analytical and preparative liquid chromatography on amylose chiral stationary phases and characterization of the enantiomers. Chirality 2009; 21:769-76. [DOI: 10.1002/chir.20678] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lipka E, Charton J, Vaccher MP, Folly-Klan M, Bonte JP, Vaccher C. Enantioseparation of chiral benzimidazole derivatives by electrokinetic chromatography using sulfated cyclodextrins. J Sep Sci 2009; 32:1907-15. [DOI: 10.1002/jssc.200800713] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Goossens JF, Roux S, Egron D, Perigaud C, Bonte JP, Vaccher C, Foulon C. Separation of nucleoside phosphoramidate diastereoisomers by high performance liquid chromatography and capillary electrophoresis. J Chromatogr B Analyt Technol Biomed Life Sci 2009; 875:288-95. [PMID: 18773872 DOI: 10.1016/j.jchromb.2008.06.056] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2008] [Revised: 06/20/2008] [Accepted: 06/24/2008] [Indexed: 10/21/2022]
Abstract
Separations of five diastereoisomers of nucleoside phosphoramidate derivatives (pronucleotides) were performed by both HPLC method using derivatized cellulose and amylose chiral stationary phases and CE method using anionic cyclodextrins added in the background electrolyte (BGE). An optimal baseline separation (Rs > 1.5) was readily obtained with all silica-based celluloses and amyloses using in a normal-phase methodology. Capillary electrophoresis was used as an alternative technique to HPLC for the separation of pronucleotides. The diastereoisomers were fully resolved with sulfated cyclodextrins at both BGE pH (2.5 and 6.2). Limits of detection and limits of quantification, calculated for both methods, are up to 200 times higher in CE separations than in HPLC separations. The analytical HPLC method was then applied in a preliminary study for the pronucleotide 1 quantification in cellular extract.
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Affiliation(s)
- J F Goossens
- Laboratoire de Chimie Analytique, EA 4034, Faculté des Sciences Pharmaceutiques et Biologiques, Université de LILLE 2, BP 83, 3, rue du Pr. Laguesse, 59006 Lille Cedex, France
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Lipka E, Vaccher C, Bonte JP. Enantiomeric Resolution of Benzoxazolinonic Aminoalcohols, Potential Adrenergic Ligands, by LC and CE. Chromatographia 2009. [DOI: 10.1365/s10337-008-0940-8] [Citation(s) in RCA: 4] [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: 11/05/2022]
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Lecerf JM, Luc G, Marécaux N, Bal S, Bonte JP, Lacroix B, Cayzeele A. Small, qualitative changes in fatty acid intake decrease plasma low-density lipoprotein-cholesterol levels in mildly hypercholesterolemic outpatients on their usual high-fat diets. Int J Food Sci Nutr 2009; 60 Suppl 7:151-63. [DOI: 10.1080/09637480902758727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lipka E, Bonte JP, Vaccher C. LC Using Two Different Cellulose Chiral Stationary Phases for Direct Enantioseparation of Benzoxazolinone Aminoalcohols and Aminoketones. Chromatographia 2008. [DOI: 10.1365/s10337-008-0826-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Vaccher MP, Charton J, Guelzim A, Caignard DH, Bonte JP, Vaccher C. Preparative enantiomeric separation of potent AMP-activated protein kinase activator by HPLC on amylose-based chiral stationary phase. J Pharm Biomed Anal 2008; 46:920-8. [DOI: 10.1016/j.jpba.2008.01.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2007] [Revised: 01/16/2008] [Accepted: 01/23/2008] [Indexed: 10/22/2022]
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Danel C, Chaminade P, Odou P, Bartélémy C, Azarzar D, Bonte JP, Vaccher C. Enantioselective analysis of the antipsychotic 9-hydroxyrisperidone, main metabolite of risperidone, by chiral capillary EKC using dual CDs. Electrophoresis 2007; 28:2683-92. [PMID: 17600845 DOI: 10.1002/elps.200600837] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
An analytical method for the enantioseparation of the 9-hydroxyrisperidone, main metabolite of the antipsychotic risperidone (Risp), was developed by CD-EKC in the dual CDs mode using anionic and neutral CDs at acidic pH 2.5. Preliminary experiments allowed us to select the more suitable couple of CDs composed of sulfated-alpha-CD and hydroxypropylated-beta-CD. The optimization of the main experimental parameters (concentrations of both CDs and concentration of the phosphate buffer) was based on a central composite design through the response surface methodology. Then, the influence of the voltage and the temperature on the enantioseparation was studied using the classical univariate approach. The final method permits to resolve the enantiomers of the 9-hydroxyrisperidone with a resolution of 3.13 and an analysis time of about 13 min. Finally, this method was successfully applied for the simultaneous determination of Risp and the enantiomers of 9-hydroxyrisperidone (9-OHRisp).
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Affiliation(s)
- Cécile Danel
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille, Lille, France
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Lipka E, Danel C, Orhan H, Bonte JP, Vaccher C. Chiral resolution of melatoninergic ligands by EKC using highly sulfated CDs. Electrophoresis 2007; 28:3915-21. [DOI: 10.1002/elps.200600677] [Citation(s) in RCA: 5] [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: 11/08/2022]
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Danel C, Barthélémy C, Azarzar D, Robert H, Bonte JP, Odou P, Vaccher C. Analytical and semipreparative enantioseparation of 9-hydroxyrisperidone, the main metabolite of risperidone, using high-performance liquid chromatography and capillary electrophoresis. J Chromatogr A 2007; 1163:228-36. [PMID: 17617416 DOI: 10.1016/j.chroma.2007.06.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2007] [Revised: 06/06/2007] [Accepted: 06/13/2007] [Indexed: 11/26/2022]
Abstract
The HPLC semipreparative enantioseparation of 9-hydroxyrisperidone (9-OHRisp) was studied by optimizing various experimental conditions: the nature of the chiral stationary phase (CSP), mobile phase composition, temperature and analyte loading. This semipreparative enantioseparation was successfully completed using the polysaccharide Chiralcel OJ chiral stationary phase and a n-hexane/ethanol/methanol (50/35/15, v/v/v) ternary mobile phase. To assess the enantiomeric purity of both isolated isomers, three analytical methods using UV detection were developed and validated: one CE method using dual cyclodextrin mode and two HPLC methods using either the Chiralcel OJ CSP in normal-phase mode or the alpha-acid glycoprotein (alpha-AGP) CSP in reversed-phase mode. The three methods make it possible to obtain excellent enantioseparations (R(s) >3) with analysis times lower than 15 min, and the calculated limits of detection allow for the determination of minor enantiomeric impurities (0.1%). Enantiomeric purity obtained for dextrorotatory and levorotatory enantiomers was superior to 99.9% and equal to 98.9%, respectively, which proved the success of the semipreparative enantioseparation. A brief comparison of the performances of the analytical methods completes this work.
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Affiliation(s)
- Cécile Danel
- Laboratoire de Chimie Analytique EA 4034, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, BP 83, 3 rue du Pr. Laguesse, 59006 Lille Cedex, France
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Foulon C, Duhal N, Lacroix-Callens B, Vaccher C, Bonte JP, Goossens JF. Determination of pKa values of benzoxa-, benzothia- and benzoselena-zolinone derivatives by capillary electrophoresis. Eur J Pharm Sci 2007; 31:165-71. [PMID: 17462870 DOI: 10.1016/j.ejps.2007.03.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2006] [Revised: 03/03/2007] [Accepted: 03/05/2007] [Indexed: 11/23/2022]
Abstract
Acidity constants of benzoxa-, benzothia- and benzoselena-zolinone derivatives were determined by capillary electrophoresis, potentiometry and spectrophotometry experiments. These three analytical techniques gave pK(a) results that were in good agreement. A convenient, accurate and precise method for the determination of pK(a) was developed to measure changes in acidity constants induced by heteroatom or 6-benzoyl substituted derivatives. pK(a) values were determined simultaneously for two compounds characterized by different electrophoretic mobility (micro(e)) and pK(a) value and in the presence of an analogous neutral marker.
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Affiliation(s)
- C Foulon
- Laboratoire de Chimie Analytique, EA 4034, Faculté des Sciences Pharmaceutiques et Biologiques, Université de LILLE 2, Lille Cedex, France
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Goossens JF, Mahieu C, Dias N, Bailly C, Principe P, Bonte JP, Lansiaux A, Vaccher C, Foulon C. Chiral capillary electrophoretic determination of the enantiomeric purity of homocamptothecin derivatives, promising antitumor topoisomerase I inhibitors, using highly sulfated CDs and fluorescence detection. Electrophoresis 2006; 27:4717-29. [PMID: 17091464 DOI: 10.1002/elps.200600143] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
EKC methods for the enantiomeric resolution of homocamptothecin derivatives, potent anticancer agents targeting DNA topoisomerase I selected for clinical trials, were developed using highly sulfated beta-CD as chiral selectors at acidic pH. Optimal electrophoretic conditions, with migration times under 15 min, were as follows: for the neutral homocamptothecin analog 1, a BGE of 75 mM phosphate buffer pH 2.5 (H(3)PO(4) + triethanolamine)/ACN - 95/5 v/v, with 7.5% w/v highly S-beta-CD, an applied field of 0.2 kV/cm and a fused capillary temperature control of 30 +/- 0.1 degrees C (typical current approximately 175 microA); for the cationic homocamptothecin 2, a BGE of 25 mM phosphate buffer pH 2.5 (H(3)PO(4) + TEA)/ACN - 90/10 v/v, with 2.5% w/v highly S-beta-CD, an applied field of 0.15 kV/cm and a fused capillary temperature control of 25 +/- 0.1 degrees C (typical current approximately 45 muA), and both are validated. The best results in terms of LOQ were obtained by EC with fluorescence detection: 10 ng/mL and 20 ng/mL for 1 and 2, respectively (LOQ divided by 150 for 1 and 5 for 2 with respect to UV), thus making this method particularly convenient for enantiomeric purity determination of galenic forms. UV detection appears to be an alternative to fluorescence for the analysis of the main component either for the control of galenic forms or for therapeutic adaptation. Moreover, this method exhibits better performances than HPLC.
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Affiliation(s)
- Jean-François Goossens
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, Lille, France.
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Danel C, Foulon C, Goossens JF, Bonte JP, Vaccher C. Kinetics of racemization of enantiopure N-imidazole derivatives, aromatase inhibitors: studies in organic, aqueous, and biomimetic media. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.08.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Foulon C, Vaccher C, Villard AL, Puy JY, Lefebvre I, Perigaud C, Bonte JP, Goossens JF. Diastereoisomeric resolution of a pronucleotide using solid phase extraction and high performance liquid chromatography: Application to a stereoselective decomposition kinetic in cell extracts. J Pharm Biomed Anal 2006; 42:245-52. [PMID: 16806786 DOI: 10.1016/j.jpba.2006.04.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2006] [Revised: 03/27/2006] [Accepted: 04/04/2006] [Indexed: 11/27/2022]
Abstract
A stereospecific HPLC methodology has been developed for the diastereoisomeric resolution of a mononucleotide prodrug in cell extracts. This method involves the use of solid phase extraction on a C18 cartridge. Diastereoisomers and internal standard resolutions were performed on a cellulose based chiral column (Chiralcel OD-H) used in the normal phase mode. The method was validated in terms of specificity, recovery, linearity (diasteroisomers mixture concentration: 3-60 micromol L(-1)), precision and accuracy and detection limit (1.67 and 1.33 micromol L(-1) for first and second eluted diastereoisomer). This method was applied to the determination of the apparent rate constants of disappearance and half-lives of each stereoisomers. This permits to conclude to the stereoselectivity of the enzymatic activity involved in the decomposition pathway of 2.
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Affiliation(s)
- C Foulon
- Laboratoire de Chimie Analytique, EA 4034, Faculté des Sciences Pharmaceutiques et Biologiques, Université de LILLE 2, BP 83, 3 rue du Pr. Laguesse, 59006 Lille Cedex, France
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Pérez-Méndez O, Duhal N, Lacroix B, Bonte JP, Fruchart JC, Luc G. Different VLDL apo B, and HDL apo AI and apo AII metabolism in two heterozygous carriers of unrelated mutations in the lipoprotein lipase gene. Clin Chim Acta 2006; 368:149-54. [PMID: 16487502 DOI: 10.1016/j.cca.2005.12.038] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2005] [Revised: 11/18/2005] [Accepted: 12/21/2005] [Indexed: 11/23/2022]
Abstract
BACKGROUND Lipoprotein lipase (LPL) deficiency has been suggested as a cause of low HDL-cholesterol (HDL-C) plasma levels, by a mechanism that involves an enhanced catabolism of HDL apolipoprotein (apo) AI. To verify the role of 2 different LPL gene mutations on HDL metabolism, we studied the in vivo turnover of the apo AI and apo AII in heterozygous carriers of LPL deficiency. METHODS Apo AI and AII kinetics were studied by a 10-h primed constant infusion of 5,5,5-2H3-leucine approach in 2 carriers, 1 man (patient 1) and 1 woman (patient 2), and 5 control subjects. The rates of HDL apolipoproteins production (PR) and catabolism (FCR) were estimated using a one-compartment model-based analysis. RESULTS Both carriers had low HDL-C plasma levels and only patient 1 was hypertriglyceridemic. VLDL apo B was 4-times slower in patient 1 as compared to patient 2. The FCRs of apo AI in both carriers was within the range of the controls (0.200, 0.221 and 0.211+/-0.051 day(-1), respectively). Apo AII FCR in patient 1 was about 20% lower than the mean of the control group whereas being normal in patient 2. Apo AI PR in patient 1 (9.20 mg kg(-1) day(-1)) was below the lowest value in controls (range, 10.52-13.24 mg kg(-1) day(-1)) whereas in patient 2 it was normal. Apo AII PR in both patients was similar to controls. CONCLUSION The heterozygous carriers of 2 different mutations in the LPL gene had different VLDL apo B FCR, and from normal to slightly low HDL apolipoprotein FCR and PR. These results disagree with the putative enhanced apo AI FCR in LPL deficient patients and suggest the need to reconsider the effects of LPL activity on HDL metabolism.
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Affiliation(s)
- Oscar Pérez-Méndez
- Department of Atherosclerosis, INSERM U545, Institut Pasteur de Lille, Lille, France.
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Danel C, Azaroual N, Foulon C, Goossens JF, Vermeersch G, Bonte JP, Vaccher C. NMR studies of chiral recognition mechanisms: interaction of enantiomers of N-imidazole derivatives with cyclodextrin hosts. Correlation with the CD-EKC studies. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.03.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [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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Goossens JF, Foulon C, Villard AL, Puy JY, Lefebvre I, Perigaud C, Vaccher C, Bonte JP. Column selection and method development for the separation of nucleoside phosphotriester diastereoisomers, new potential anti-viral drugs. Application to cellular extract analysis. Biomed Chromatogr 2005; 19:415-25. [PMID: 16037929 DOI: 10.1002/bmc.500] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Analytical HPLC methods using derivatized cellulose and amylose chiral stationary phases used in normal and reversed-phase modes were developed for the diastereoisomeric separation of mononucleotide prodrugs (pronucleotides) of 3'-azido-2',3'-dideoxythymidine (AZT). The resolutions were performed with two silica-based celluloses using normal and reversed-phase methodologies: Tris-3,5-dimethylphenylcarbamate (Chiralcel OD-H and Chiracel OD-RH) and Tris-methylbenzoate (Chiralcel OJ and OJ-R). Two amyloses phases, Tris-3,5-dimethylphenylcarbamate (Chiralpak AD) and Tris-(S)-1-phenylethylcarbamate (Chiralpak AS), were used in normal-phase mode. Additionally, we developed separation using two stationary phases with immobilized cyclodextrins in reversed-phase and polar-organic modes. The mobile phase and the chiral stationary phase were varied to achieve the best resolution. Different types and concentration of aliphatic alcohols, acetonitrile or water in the mobile phase were also tested for the different separation modes. An optimal baseline separation (Rs > 1.5) was readily obtained with all silica-based celluloses and amyloses using a normal-phase methodology. The different columns gave complementary results in term of resolution. Limits of detection and quantification were 0.12-0.20 and 0.40-0.67 microm, respectively. This analytical method was applied in a preliminary study for the pronucleotide 2 quantification in cellular extract.
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Affiliation(s)
- J F Goossens
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lilie 2,1 BP 83,1 3 rue du Pr. Laguesse, 59006 Lille Cedex, France. jfgoosse@pharma, univ-lille2.fr
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Danel C, Lipka E, Bonte JP, Goossens JF, Vaccher C, Foulon C. Enantioseparation of chiralN-imidazole derivatives by electrokinetic chromatography using highly sulfated cyclodextrins: Mechanism of enantioselective recognition. Electrophoresis 2005; 26:3824-32. [PMID: 16217831 DOI: 10.1002/elps.200500078] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Baseline separation of ten new substituted [1-(imidazo-1-yl)-1-phenylmethyl)] benzothiazolinone and benzoxazolinone derivatives, with one chiral center, was achieved by CD-EKC using highly sulfated CDs (alpha, beta, gamma highly S-CDs) as chiral selectors. The influence of the type and concentration of the chiral selectors on the enantioseparations was investigated. The highly S-CDs exhibit a very high enantioselectivity power since they allow excellent enantiomeric resolutions compared to those obtained with the neutral CDs. The enantiomers were resolved with analysis times inferior to 2.5 min and resolution factors R(s) of 3.73, 3.90, 1.40, and 4.35 for compounds 1, 2, 3, and 5, respectively, using 25 mM phosphate buffer at pH 2.5 containing either highly S-alpha-CD, highly S-beta-CD, and highly S-gamma-CD (3 or 4% w/v) at 298 K, with an applied field of 0.30 kV/cm. The determination of the enantiomer migration order for the various analytes and the study of the analyte structure-enantioseparation relationships display the high contribution of the interactions between the analytes phenyl ring and the CDs to the enantiorecognition process. The thermodynamic study of the analyte-CD affinities permits us to improve our knowledge about the enantioseparation mechanism.
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Affiliation(s)
- Cécile Danel
- Laboratoire de Chimie Analytique EA 1043, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, Lille Cedex, France
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Vaccher MP, Lipka E, Bonte JP, Foulon C, Goossens JF, Vaccher C. Enantiomeric analysis of baclofen analogs by capillary zone electrophoresis, using highly sulfated cyclodextrins: Inclusion ionization constant pKa determination. Electrophoresis 2005; 26:2974-83. [PMID: 15995978 DOI: 10.1002/elps.200410311] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Using cyclodextrin-capillary zone electrophoresis (CD-CZE), baseline separation of baclofen phaclofen, saclofen, and hydroxy-saclofen, potent gamma-aminobutyric acid(B) (GABA(B)) agonist or antagonists was achieved. A method for the enantioresolution of those analogs of GABA was developed using anionic cyclodextrins (highly sulfated CD or highly S-CD) as chiral selectors and capillaries dynamically coated with polyethylene oxide (PEO). With charged CDs we observed good resolutions due to the large electrophoretic mobility of these chiral selectors opposite to the mobility of the solutes. The highly S-alpha-CD and S-beta-CD were found to be complementary and the most effective complexing agent, allowing good enantiomeric resolution in short runtimes. The complete resolution was obtained using 25 mM phosphate buffer at pH 2.5 containing 3% w/v of highly S-alpha-CD or S-beta-CD at 25 degrees C with an applied field of 0.30 kV/cm. The apparent binding constants of the inclusion complexes were evaluated and the migration order was determined. A comparison was possible to investigate the importance of the anionic group of the molecules in the separations. The pK(a) values were determined for all four compounds in order to explain relative electrophoretic migration of the solutes.
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Affiliation(s)
- Marie-Pierre Vaccher
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille, France.
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Lipka E, Guelzim A, Yous S, Bonte JP, Vaccher C. Preparative HPLC separation of methoxytetralins, ligands for melatonin receptors, containing two chiral centers with polysaccharide chiral stationary phases. Determination of enantiomeric purity. ACTA ACUST UNITED AC 2005; 64:46-58. [PMID: 15993947 DOI: 10.1016/j.jbbm.2005.05.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Revised: 04/27/2005] [Accepted: 05/27/2005] [Indexed: 11/23/2022]
Abstract
Preparative chromatography was used to obtain approximately 200 mg of each of the four individual isomers of the three methoxytetrahydronaphthalenic derivatives, new agonist and antagonist ligands for melatonin receptors to be tested for binding. The mobile and stationary phases were chosen to achieve best resolution in shorter runtime. Enantiomeric purity was verified and quantified using normal and reversed phase methodology on cellulose CSPs. Enantiomer elution order was analysed and discussed. Limit of detection (LOD) and limit of quantification (LOQ) were calculated.
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Affiliation(s)
- Emmanuelle Lipka
- Laboratoire de Chimie Analytique EA 1043, UFR de Physique, Bâtiment P5, Université de Lille 1, 59655 Villeneuve d'Ascq Cedex, France
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Quilliot D, Walters E, Bonte JP, Fruchart JC, Duriez P, Ziegler O. Diabetes mellitus worsens antioxidant status in patients with chronic pancreatitis. Am J Clin Nutr 2005; 81:1117-25. [PMID: 15883437 DOI: 10.1093/ajcn/81.5.1117] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Patients with chronic pancreatitis (CP) are at high risk of antioxidant deficiencies. Furthermore, this disease can lead to diabetes mellitus (DM) that could exacerbate the severity of oxidative stress. Oxidative stress and the resulting LDL oxidation are a major cause of atherosclerosis. OBJECTIVE The objective of the study was to ascertain whether diabetes significantly modifies oxidative status in patients with CP. DESIGN CP patients with or without DM were compared with type 1 DM patients and healthy control subjects. RESULTS Two-way factorial analyses showed that a decrease in the plasma concentrations of vitamin A, vitamin E, and carotenoids accompanied both CP and DM, and CP was also associated with lower plasma concentrations of selenium and zinc, lower catalase activity, and higher plasma concentrations of copper. The lag phase of LDL oxidation was lower in CP patients with or without DM than in the control subjects, whereas there was no significant difference between type 1 DM patients and control subjects. Multivariate analysis showed that LDL vitamin E (R2 = 0.24, P < 0.0001) and fasting plasma glucose (R2 = 0.32, P < 0.0001) concentrations were the main determinants of the lag phase of LDL oxidation. CONCLUSIONS Antioxidant status is altered in CP patients, particularly in those who also have DM. In these patients, a vitamin E deficiency and an elevated plasma glucose concentration were associated with significantly higher LDL oxidizability.
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Affiliation(s)
- Didier Quilliot
- Service de Diabétologie, Maladies Métaboliques et Nutrition, Hôpital Jeanne d'Arc, CHU de Nancy, France.
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Danel C, Foulon C, Park C, Yous S, Bonte JP, Vaccher C. Enantiomeric resolution of new aromatase inhibitors by liquid chromatography on cellulose chiral stationary phases. J Sep Sci 2005; 28:428-34. [PMID: 15835730 DOI: 10.1002/jssc.200401761] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Analytical HPLC methods using derivatized cellulose chiral stationary phases were developed for the direct enantioseparation of substituted [1-(imidazo-1-yl)-1-phenylmethyl)]-benzothiazolinone and benzoxazolinone derivatives with one chiral center. Those analogues of fadrozole constitute new potent nonsteroidal inhibitors of aromatase (P450 arom). The separations were made using normal phase methodology with a mobile phase consisting of n-hexane-alcohol (ethanol, 1-propanol, or 2-propanol) in various proportions, and a silica-based cellulose tris-3,5-dimethylphenylcarbamate (Chiralcel OD-H), or tris-methylbenzoate (Chiralcel OJ). The effects of concentration of various aliphatic alcohols in the mobile phase were studied. A better separation was achieved on cellulose carbamate phase compared with the cellulose ester phase. The effects of structural features of the solutes along with the temperature of the column on the discrimination between the enantiomers were examined. Baseline separation (Rs > 1.5) was easily obtained in many cases.
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Affiliation(s)
- Cécile Danel
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, BP 83, 3, rue du Pr. Laguesse, 59006 Lille Cedex, France
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35
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Foulon C, Danel C, Vaccher MP, Bonte JP, Vaccher C, Goossens JF. Chiral separation of N-imidazole derivatives, aromatase inhibitors, by cyclodextrin-capillary zone electrophoresis. Mechanism of enantioselective recognition. Electrophoresis 2005; 25:2735-44. [PMID: 15352005 DOI: 10.1002/elps.200405903] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Baseline separation of ten new, substituted [1-(imidazo-1-yl)-1-phenylmethyl)] benzothiazolinone and benzoxazolinone derivatives with one chiral center was achieved using cyclodextrin-capillary zone electrophoresis (CD-CZE). A method for the enantiomeric resolution of these compounds was developed using neutral CDs (native alpha-, beta-, gamma-CDs or alpha-, beta-, gamma-hydroxypropyl (HP)-CDs) as chiral selectors. Operational parameters including the nature and concentration of the chiral selectors, pH, ionic strength, organic modifiers, temperature, and applied voltage were investigated. The use of neutral CDs provides enantiomeric resolution by inclusion of compounds in the CD cavity. The HP-alpha-CD and HP-beta-CD were found to be the most effective complexing agents and allowed efficient enantiomeric resolutions. Optimal separation of N-imidazole derivatives was obtained using 50 mM phosphate buffer at pH 2.5 containing either HP-alpha-CD or HP-beta-CD (7.5-12.5 mM) at 25 degrees C, with an applied field of 0.50 kV.cm(-1) giving resolution factors Rs superior to 1.70 with migration times of the second enantiomer less than 13 min. The same enantiomer migration order observed for all molecules can be related to a close interaction mechanism with CDs. The influence of structural features of the solutes on Rs and tm was studied. The lipophilic character (log kw) of the solutes and the apparent and averaged association constants of inclusion complexes for four compounds with the six different CDs led us to rationalize the enantioseparation mechanisms. The conclusions were corroborated with reversed-phase high-performance liquid chromatography (HPLC) on chiral stationary phases (CSPs) based on CDs.
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Affiliation(s)
- Catherine Foulon
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille, Lille, France
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Danel C, Foulon C, Guelzim A, Park CH, Bonte JP, Vaccher C. Preparative enantiomeric separation of new aromatase inhibitors by HPLC on polysaccharide-based chiral stationary phases: Determination of enantiomeric purity and assignment of absolute stereochemistry by X-ray structure analysis. Chirality 2005; 17:600-7. [PMID: 16200535 DOI: 10.1002/chir.20206] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The development of high-performance liquid chromatography methods on polysaccharide-based stationary phases (cellulose or amylose derivatives) has permitted preparative enantioseparations of various 6-[1(imidazol-1-yl)-1-phenylmethyl]-3-methyl-1,3-benzoxazol-2(3H)-one and 6-[1(imidazol-1-yl)-1-phenylmethyl]-3-methyl-1,3-benzothiazol-2(3H)-one, aromatase inhibitors, with satisfactory yields. Analytical enantioseparation methods using both UV and evaporative light-scattering detection (ELSD) were validated to determine the enantiomeric purity of these compounds. Using UV detection, linear calibration curves in the range from 4 x 10(-6) to 4.8 x 10(-4) M range were obtained; repeatability, limits of detection (LD), and quantification (LQ) were determined: LD varied, for the various solutes, from 1 to 80 microg/l and from 2.05 to 10.05 mg/l with UV detection and ELSD, respectively. Single-crystal X-ray analysis was successful in determining the absolute configuration of the individual enantiomers. The relationship between retention order and absolute configuration of the enantiomers was established.
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Affiliation(s)
- Cecile Danel
- Laboratoire de Chimie Analytique, EA 1043, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, France
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Vaccher MP, Lipka E, Bonte JP, Vaccher C. Chiral capillary electrophoretic resolution of baclofen, gabaergic ligand, using highly sulfated cyclodextrins. Electrophoresis 2004; 25:1111-9. [PMID: 15095454 DOI: 10.1002/elps.200305796] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Using cyclodextrin-capillary zone electrophoresis (CD-CZE), baseline separation of baclofen, a potent GABA(B) agonist; was achieved. A method for the enantioresolution of this gamma-aminobutyric acid (GABA) and determination of enantiomeric purity was developed using CDs (highly sulfated-CD or highly S-CD) as chiral selectors and capillaries dynamically coated with polyethylene oxide (PEO). Operational parameters, such as the nature and concentration of the chiral selectors, buffer concentration, organic modifiers, and applied voltage, were investigated. The use of charged CDs provides a driving force in the opposite direction of the positively charged baclofen in the running buffer and enantiomeric resolution by inclusion of compounds in the CD cavity. Highly S-beta-CD was found to be the most effective complexing agent, allowing good enantiomeric resolution. The complete resolution was obtained using 25 mM phosphate buffer, pH 2.5, containing 3% w/v highly S-beta-CD at 25 degrees C with aN applied field of 0.40 kV/cm. The apparent association constants of the inclusion complexes were calculated. This optimized method was validated in terms of repeatability and limits of detection (0.13 microg x mL(-1)) and quantification. The migration order was determined.
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Affiliation(s)
- Marie-Pierre Vaccher
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille, Lille, France
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Lipka E, Selouane A, Postel D, Len C, Vaccher MP, Bonte JP, Vaccher C. Enantioseparation of four cis and trans diastereomers of 2′,3′-didehydro-2′,3′-dideoxythymidine analogs, by high-performance liquid chromatography and capillary electrophoresis. J Chromatogr A 2004; 1034:161-7. [PMID: 15116926 DOI: 10.1016/j.chroma.2004.02.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Compounds 1-4 are the four stereoisomers of a synthetic new potential antiviral agent (d4T analog) containing two chiral centers and a base (uracil). Both high-performance liquid chromatography (HPLC) and capillary electrophoresis (CE) techniques were used to separate and quantify enantiomers with high resolution. The determination of enantiomeric purity of the compounds was developed using both amylose chiral stationary phase by HPLC and anionic cyclodextrins (highly S-CD) as chiral selectors in CE. The HPLC method was found to be superior in sensitivity to the CE method.
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Affiliation(s)
- E Lipka
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille II, BP 83-3, rue du Pr. Laguesse, 59006 Lille Cedex, France
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Foulon C, Danel C, Vaccher C, Yous S, Bonte JP, Goossens JF. Determination of ionization constants of N-imidazole derivatives, aromatase inhibitors, using capillary electrophoresis and influence of substituents on pKa shifts. J Chromatogr A 2004; 1035:131-6. [PMID: 15117082 DOI: 10.1016/j.chroma.2004.02.053] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Capillary electrophoresis (CE) was used as a method to determine the acidity constants of eight aromatase inhibitors. This method was validated by comparison of results obtained with a traditional method, UV spectroscopy, and additionally with computational calculations. We confirmed here, with our series of compounds, that capillary electrophoresis is an attractive method for pKa measurements which is based on migration time or mobilities of the ionic species over a range of pH values. The precision of pKa measurements of N-imidazole derivatives is useful to observe pKa shifts induced by chemical modifications introduced on adjacent aromatic rings such as heterocycle (benzoxa- or benzothiazolinone) or substituted benzyle. The knowledge of these pKa values is a great interest to predict migration of solutes and qualitative interactions with ionized cyclodextrines as chiral selectors in further enantioseparative CE studies.
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Affiliation(s)
- C Foulon
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, BP 83, 3 Rue du Pr. Laguesse, 59006 Lille Cedex, France
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Lipka E, Daniel C, Vaccher MP, Glaçon V, Ewing D, Mackenzie G, Len C, Bonte JP, Vaccher C. Enantioseparation of new nucleoside analogs, related to d4T and acyclovir, by chiral capillary electrophoresis using highly sulfatedβ-cyclodextrins. Electrophoresis 2004; 25:444-53. [PMID: 14760636 DOI: 10.1002/elps.200305706] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Baseline separation of some new acyclic nucleosides which are potential antiviral agents was achieved using cyclodextrin capillary zone electrophoresis (CD-CZE). A method for the enantiomeric resolution of these compounds and determination of their enantiomeric purity was developed using anionic CDs (highly sulfated-CD or highly S-CD) as chiral selectors and capillaries, which were dynamically coated with polyethylene oxide (PEO). Operational parameters including (i) the nature and concentration of the chiral selectors, (ii) organic modifiers, (iii) temperature, and (iv) applied voltage were investigated. The use of charged CDs provides (i) a supplementary driving force for the compounds in a running buffer and (ii) enantiomeric resolution by inclusion of compounds in the CD cavity. The highly S-CD was found to be the most effective complexing agent and allowed good enantiomeric resolution. The complete resolution of five nucleoside analogs was obtained using 25 mM phosphate buffer, pH 2.5, containing either highly S-alpha-CD, S-beta-CD or S-gamma-CD at 30 degrees C with an applied field of 0.30 kV/cm. The apparent association constants of the inclusion complexes were calculated. The enantiomer migration order for the molecules investigated was determined and the detection limit of enantiomeric impurities was found to vary between 0.34 to 3.56 ng.mL(-1) for the first enantiomer.
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Affiliation(s)
- Emmanuelle Lipka
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, Lille, France
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Quilliot D, Walters E, Böhme P, Lacroix B, Bonte JP, Fruchart JC, Drouin P, Duriez P, Ziegler O. Fatty acid abnormalities in chronic pancreatitis: effect of concomitant diabetes mellitus. Eur J Clin Nutr 2003; 57:496-503. [PMID: 12627189 DOI: 10.1038/sj.ejcn.1601556] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2001] [Revised: 06/12/2002] [Accepted: 06/18/2002] [Indexed: 11/09/2022]
Abstract
OBJECTIVE Patients with chronic pancreatitis suffer from malabsorption and nutritional deficiencies. However there is little data available concerning the fatty acid profile in chronic pancreatitis. Diabetes mellitus, a common complication of this disease, could interfere with the metabolism of fatty acids. SUBJECTS We therefore compared the fatty acid composition of LDL from four groups of male patients with (a) chronic pancreatitis without diabetes (ND-CP; n=12), (b) diabetes secondary to chronic pancreatitis and insulin-treated (CP-D; n=35); (c) type 1 diabetes (n=25); and (d) controls (n=20). RESULTS The patients in both groups of chronic pancreatitis (ND-CP and CP-D) had lower mean values for linoleic acid than that seen in the type 1 DM and control groups, whereas monounsaturated fatty acids (MUFA; 18 : 1(n-9) and (16 : 1(n-7)) were significantly increased in these two groups (ND-CP and CP-D). Docosa-hexaenoic-acid (22 : 6(n-3)) was significantly decreased in the CP-D group (P>0.05), a response that could be explained by the effects of diabetes mellitus and by selenium deficiency. In this way, diabetes was associated with a decrease in the docosa-hexaenoic-acid (22 : 6(n-3); r=0.30, P=0.005), and selenium was correlated with DHA (r=0.28, P=0.029) and with the 22 : 6(n-3)/20 : 5(n-3) ratio (evaluating the delta 4 desaturation); r=0.31, P=0.022), independently of the diabetes effect. Selenium was negatively correlated with 20 : 4(n-6)/20 : 3(n-6) ratio (evaluating the delta 5 desaturase; r=-0.30; P=0.025). These results suggest that these two factors may have a role in the regulation of the desaturation process. If we consider that a ratio of 16 : 1(n-7)/18 : 2(n-6) greater than 0.086 in plasma indicates an EFAn-6 deficiency, 40% of our CP patients, 57.6% of CP-D patients and 13.6% of type 1 DM patients were involved. CONCLUSIONS The consequences of these deficiencies are not evaluated in this disease. However, correction of the fundamental deficiencies in essential fatty acids and in selenium seems desirable in chronic pancreatitis.
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Affiliation(s)
- D Quilliot
- Centre d'Investigation Clinique, Centre Hospitalo Universitaire et INSERM, France.
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Lipka-Belloli E, Glaçon V, Mackenzie G, Ewing D, Len C, Vaccher C, Bonte JP. Determination of the enantiomeric purity of nucleoside analogs related to d4T and acyclovir, new potential antiviral agents, using liquid chromatography on cellulose chiral stationary phases. J Chromatogr A 2002; 972:211-9. [PMID: 12416879 DOI: 10.1016/s0021-9673(02)01036-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We reported a method of determination of enantiomeric purity of the new potential antiviral agents by direct analytical HPLC. Those agents are nucleoside analogs, having one chiral center. They are synthesized as a single enantiomer (R or S) by an asymmetric pathway. The chiral stationary phases chosen are silica-based cellulose tris-3,5-dimethylphenylcarbamate (Chiralcel OD-H), or tris-methylbenzoate (Chiralcel OJ). Resolution was achieved using normal-phase chromatography with a mobile phase consisting of n-hexane-alcohol (ethanol or 2-propanol) in various percentages. Furthermore the effects of structural features on retention, selectivity and resolution, as well as on the elution order were thoroughly studied. Differences in the lipophilicity of the compounds were also examined.
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Affiliation(s)
- Emmanuelle Lipka-Belloli
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille 2, France
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Foulon C, Goossens JF, Fourmaintraux E, Bonte JP, Vaccher C. Chiral capillary electrophoretic determination of the enantiomeric purity of tetrahydronaphthalenic derivatives, melatoninergic ligands, using highly sulfated beta-cyclodextrins. Electrophoresis 2002; 23:1121-8. [PMID: 11981861 DOI: 10.1002/1522-2683(200204)23:7/8<1121::aid-elps1121>3.0.co;2-f] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Using cyclodextrin capillary zone electrophoresis (CD-CZE), baseline separation of synthetic tetrahydronaphthalenic derivatives, potential melatoninergic compounds, was achieved. A method for the enantioresolution of these tetralins and determination of their enantiomeric purity was developed using anionic CDs (highly sulfated-CD or highly S-CD) as chiral selectors and capillaries dynamically coated with polyethylene oxide (PEO). Operational parameters such as the nature and concentration of the chiral selectors, buffer pH, organic modifiers, temperature and applied voltage were investigated. The use of charged CDs provides a driving force for our neutral compounds in the running buffer and enantiomeric resolution by inclusion of compounds in the CD cavity. The highly S-beta-CD was found to be the most effective complexing agent, allowing good enantiomeric resolution. The complete resolution of three tetralin compounds was obtained using 25 mM phosphate buffer at pH 2.5 containing 2.5% w/v of highly S-beta-CD at 25 degrees C with an applied field of 0.25 kV/cm. The apparent association constants of the inclusion complexes were calculated. This optimized method was validated in terms of linearity, sensitivity, accuracy and recovery. The enantiomeric purity for the three molecules was determined and the detection limit of enantiomer impurities is about 0.3-0.6%.
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Affiliation(s)
- Catherine Foulon
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille, France
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Lipka-Belloli E, Len C, Mackenzie G, Ronco G, Bonte JP, Vaccher C. Diastereomeric resolution of nucleoside analogues, new potential antiviral agents, using high-performance liquid chromatography on polysaccharide-type chiral stationary phases. J Chromatogr A 2002; 943:91-100. [PMID: 11820284 DOI: 10.1016/s0021-9673(01)01431-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper describes the separation of the four sets of stereoisomers of nucleoside analogs, new potential antiviral agents by direct analytical HPLC methods using derivatized cellulose and amylose chiral stationary phases. The resolution was made using normal-phase methodology with a mobile phase consisting of n-hexane-alcohol (ethanol or 2-propanol) in various percentages, and a silica-based cellulose tris-3,5-dimethylphenylcarbamate (Chiralcel OD-H), or tris-methylbenzoate (Chiralcel OJ) and a silica-based amylose tris-3,5-dimethylphenylcarbamate (Chiralpak AD) or tris-(S)-1-phenylethylcarbamate (Chiralpak AS). The effects of structural features on the extent of discrimination between the stereoisomers were examined through the retention, the selectivity and the resolution factors as well as the elution order. Baseline separation (Rs>1.5) was easily obtained in many cases. The resolution results were complementary between the different columns.
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Affiliation(s)
- Emmanuelle Lipka-Belloli
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques, Université de Lille, France
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Belloli E, Vaccher C, Fourmaintraux E, Guelzim A, Bonte JP. PREPARATIVE CHROMATOGRAPHIC ENANTIOSEPARATION OF PUTATIVE MELATONIN RECEPTOR AGENTS, USING CELLULOSE CHIRAL STATIONARY PHASES. ANAL LETT 2001. [DOI: 10.1081/al-100107524] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Belloli E, Foulon C, Yous S, Vaccher MP, Bonte JP, Vaccher C. Direct separation of the stereoisomers of methoxytetrahydronaphthalene derivatives, new agonist and antagonist ligands for melatonin receptors, by liquid chromatography on cellulose chiral stationary phases. J Chromatogr A 2001; 907:101-13. [PMID: 11217017 DOI: 10.1016/s0021-9673(00)01020-7] [Citation(s) in RCA: 12] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Analytical HPLC methods using derivatized cellulose chiral stationary phases were developed for the direct separation of the stereoisomers of disubstituted tetralin derivatives with two chiral centers, new agonist and antagonist ligands for melatonin receptors. The separations were made using normal-phase methodology with a mobile phase consisting of n-hexane-alcohol (methanol, ethanol, 1-propanol or 2-propanol) in various proportions, and a silica-based cellulose tris-3,5-dimethylphenylcarbamate (Chiralcel OD-H), or tris-methylbenzoate (Chiralcel OJ). The effects of concentration of various aliphatic alcohols in the mobile phase were studied. A better separation was achieved on cellulose carbamate phase compared with the cellulose ester phase. The effects of structural features of the solutes on the discrimination between the stereoisomers were examined. Baseline separation (Rs>1.5) was easily obtained in many cases.
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Affiliation(s)
- E Belloli
- Laboratoire de Chimie Analytique, Faculté des Sciences Pharmaceutiques et Biologiques, Université de Lille, France
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Beghin L, Duhal N, Poulain P, Hauw P, Lacroix B, Lecerf JM, Bonte JP, Fruchart JC, Luc G. Measurement of apolipoprotein B concentration in plasma lipoproteins by combining selective precipitation and mass spectrometry. J Lipid Res 2000. [DOI: 10.1016/s0022-2275(20)32024-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Beghin L, Duhal N, Poulain P, Hauw P, Lacroix B, Lecerf JM, Bonte JP, Fruchart JC, Luc G. Measurement of apolipoprotein B concentration in plasma lipoproteins by combining selective precipitation and mass spectrometry. J Lipid Res 2000; 41:1172-6. [PMID: 10884300] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
The measurement of apolipoprotein B (apoB) in purified lipoproteins by immunological assays is subject to criticism because of denatured epitopes or immunoreactivity differences between purified lipoproteins and standard. Chemical methods have therefore been developed, such as the selective precipitation of apoB followed by quantification of the precipitate. In this study, we present the measurement of apoB concentration in lipoproteins purified by ultracentrifugation by combining isopropanol precipitation and gas chromatography/mass spectrometry. Very low density lipoprotein (VLDL; d < 1.006 g/mL); VLDL plus intermediate density lipoprotein (VLDL + IDL; d < 1.019 g/mL); and VLDL, IDL, and low density lipoprotein (VLDL + IDL + LDL; d < 1.063 g/mL) were purified by ultracentrifugation. Apolipoprotein B-100 was selectively precipitated by isopropanol. The leucine content of the pellet was then determined by gas chromatography/mass spectrometry, using norleucine as internal standard. Knowledge of the number of leucine molecules in one apoB-100 molecule makes it possible to calculate the plasma concentration of apoB in the various lipoprotein fractions. ApoB in IDL (d 1.006-1.019 g/mL) and LDL (d 1.019-1.063 g/mL) were then determined by subtracting VLDL-apoB from apoB in lipoproteins d < 1.019 and apoB in lipoproteins d < 1.019 g/mL from apoB in lipoproteins d < 1.063 g/mL, respectively. The isopropanol precipitate was verified as pure apoB (>97%) in lipoprotein fractions isolated from normo- and hyperlipidemic plasma and the method appeared reproducible. The combination of isopropanol precipitation and the GC/MS method appears therefore to be a precise and reliable method for kinetic and epidemiological studies.
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Affiliation(s)
- L Beghin
- Department of Atherosclerosis, Institut Pasteur de Lille, France
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Perez-Mendez O, Bruckert E, Franceschini G, Duhal N, Lacroix B, Bonte JP, Sirtori C, Fruchart JC, Turpin G, Luc G. Metabolism of apolipoproteins AI and AII in subjects carrying similar apoAI mutations, apoAI Milano and apoAI Paris. Atherosclerosis 2000; 148:317-25. [PMID: 10657568 DOI: 10.1016/s0021-9150(99)00279-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
ApoAI Milano (AI(M)) and apoAI Paris (AI(P)) are mutant forms of apoAI in which cysteine is substituted for arginine at residues 173 and 151 respectively leading to the formation of homodimers and heterodimers with apoAII. Heterozygous subjects with these mutants are characterized by low levels of plasma HDL cholesterol and apoAI. The present study analyzed the metabolism of the different complexes of apoAI in three subjects, two AI(M) and one AI(P), using a primed-constant infusion of trideuterated leucine. In AI(M) carriers, the mutant form was almost equally distributed in AI(M) dimer, AI(M):AII heterodimer and the monomer, whereas, in the AI(P) subject, the mutant apoAI was essentially in the apoAI(P):AII complex. Normal apoAI was low in the AI(M) subjects (20 and 16 mg/dl) but very low in the AI(P) subject (0.3 mg/dl). In the AI(M) subjects, the low levels of apoAI were due to a rapid catabolism with a normal synthetic rate. However, the apoAI kinetics were heterogeneous with a rapid catabolism of the AI(M):AII complex (FCR of 0.430 and 0.401 day(-1)) and the AI(M) monomer (FCR of 0.570 and 0.406 day(-1)) whereas the AI(M) dimer was catabolized slowly (FCR of 0.114 and 0. 118 day(-1)). In contrast, AI(P) was catabolized relatively slowly with a FCR of 0.263, 0.182 and 0.258 day(-1) for AI(P) homodimer, apoAI(P):AII heterodimer and AI(P) monomer. In the three subjects, normal apoAI was catabolized quickly, with an FCR of 0.805 and 0.601 day(-1) in AI(M) carriers and 0.526 day(-1) in the AI(P) carrier. Therefore, the low level of apoAI in the AI(P) carrier is caused by a low production rate of apoAI, particularly of normal apoAI. In conclusion, apoAI is kinetically heterogeneous in AI(M) and in AI(P) subjects. Moreover, the two mutations lead to significant differences in the kinetic behavior of mutant apoAI depending on its inclusion in its complexes.
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Affiliation(s)
- O Perez-Mendez
- Department of Atherosclerosis, SERLIA and INSERM U325, Institut Pasteur de Lille, 1, rue du Professeur Calmette, 59019, Lille, France
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Belloli E, Vaccher C, Bonte JP. Influence of the kind of the Alcoholic Modifier on Chiral Separation of 4-Substituted-Pyrrolidin-2-Ones Using Amylose Based Chiral Stationary Phase. ANAL LETT 2000. [DOI: 10.1080/00032710008543237] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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