p-12583a: rapid enantiomeric separation of basic drugs and ......hplc 2008, baltimore, md, may...

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Rapid Enantiomeric Separation of Basic Drugs and Metabolites: A Universal Strategy for Ultra-Fast Method Development. John C. Hudson and Hans A. Dewald, Beckman Coulter, Inc., Fullerton, CA, USA Introduction Introduction This work describes the use of charged cyclodextrins in a continuing search for a universal strategy for separation of enantiomeric drug substances. The use of highly sulfated cyclodextrins (HSCDs), originally proposed by Chapman and Chen (1), is a well established and efficient approach used in many laboratories worldwide. In this study, a group of compounds was selected from a set of drugs and metabolites of pharmaceutical and forensic interest (2). This group of compounds was challenging because it included many closely related metabolites of drug substances in addition to the parent drugs. The results confirmed those of the earlier study (1) and allowed the current strategy to be used as a model for ultra- fast methods development. The strategy has been applied in the determination of drug purity for the pharmaceutical industry. An example of purity analysis illustrates the steps and practical considerations required for a successful outcome. Chemicals: Solutions of alpha-, beta- and gamma HSCD at a concentration of 20% w/v and all other reagents were purchased from Beckman Coulter, Fullerton, CA, USA. The reagents were prepared as per the enclosed product documentation. Drug and Metabolite Standards: Standards were purchased from Cerilliant Corporation, Round Rock, TX, USA or were obtained as a gift from the Royal Canadian Mounted Police, Forensic Laboratory, Winnipeg, MB, Canada or Dr. Robert Meatherall, St. Boniface Hospital, Winnipeg, MB, Canada. Solutions of these drug and metabolite standards were purchased or prepared at a concentration of 1 mg/mL and diluted to 25 ppm (25 ng/μL) in distilled and deionized water. Reference Marker: 1,3,6,8-Pyrene tetrasulfonate (PTS), 10 mM in water: 2 μL added to each sample. Instrument: P/ACE TM MDQ Capillary Electrophoresis System (Beckman Coulter, Fullerton, CA) equipped with a Photodiode Array Detector (PDAD) with detection at 200 nm (scanning 190- 350) and 32 KaratVersion 7 Software. Run Buffers: All chiral separations were performed in 5% HSCD in 25 mM triethylammonium phosphate pH 2.5 unless otherwise noted as either run in 2.5% or 7.5% of the HSCD. Capillaries and Conditioning: Fused-silica capillaries, 50 μm I.D. x 30 cm (effective length 20 cm) were used in all separations. The columns are rinsed daily with 25 mM lithium acetate containing 0.4% Polyethylene Oxide (PEO,MW 300,000) and 10% ethylene glycol, adjusted to pH 4.75 to speed up column equilibration. Applied Voltage: The voltage was set at 15 kV (500 V/cm) resulting in running currents of 140 to 180 μamps for 50 μm I.D. columns. Temperatures: Capillary and sample storage = 22 o C Sample introduction: Pressure injection of 4 s at 0.3 psi or Voltage injection of 10 s at 10 kV. Material and Methods Material and Methods Results Results 1. Of the 692 compounds in a library used in forensic drugs screening (2), 101 were known to be racemic compounds and were used in this study. 2. At a concentration of 5% HSCD, 73 of the compounds were resolved at a resolution of 2 or higher. 3. Twenty-eight (28) of the 101 compounds were selected for additional runs at a concentration of 2.5 and 7.5% of each HSCD to further improve resolution. As a result of these runs, a total of 94% of the 101 compounds were resolved at 2 or greater. 4. Examples of the excellent resolution that can be achieved are shown in Figures 1 and 2. Table 1: Resolution and HSCD Systems for 101 Basic Drugs and Metabolites Conclusion Conclusion Finding a universal method for chiral separations has been a challenge for many years. An important group of drugs and metabolites, expected to be frequently detected because of widespread use by the general population, was used to evaluate the proposed universal strategy. These 101 racemic drugs and metabolites are of interest to both the pharmaceutical and forensic communities. The compounds were rapidly screened and resolved with resolutions of 2 or greater for over 94% of the group. References References 1. Chapman, J.D and A-F. Chen, LCGC Europe, January 33 - 37 (2001) 2. Hudson, J.C. et al., Can. Soc. Forens. Sci., 31(1) 1 - 29 (1998) Figure 3: Rapid Method Development for Purity Analysis Using Highly Sulfated Cyclodextrins Some elements of this poster were presented at: CE in the Biotechnology & Pharmaceuticals Industries 10th Symposium on the Practical Applications for the Analysis of Proteins, Nucleotides and Small Molecules October 12-16, 2008 and at HPLC 2008, Baltimore, MD, May 10-16, 2008. For Research Use Only; not for use in diagnostic procedures. . Minutes 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 AU 0.000 0.005 0.010 0.015 0.020 0.025 0.030 μA -160 -140 -120 -100 -80 -60 -40 -20 0 O-Desmethylvenlafaxine Venlafaxine PTS Figure 2: Venlafaxine and Metabolite in 5% Gamma-HSCD Figure 1: Methoxamine in 5% Gamma-HSCD 5. This strategy was applied to a very complex racemic drug containing four chiral centers. Prior to this, the existing method used a chromatographic approach where the enantiomers were poorly resolved. To fully resolve the Active Pharmaceutical Ingredient (API) and 3 enantiomers, this systematic process was applied as follows and is illustrated in Figure 3. Refer to steps A to E in Figure 3 (below): A. Pressure injection of the three enantiomers) at 10% of the API run in each HSCD at 5% was performed. The starting concentation of the API was 400 nanograms per microlitre in water. B. The best resolution between 5% systems, was obtained in Beta-HSCD. Improved resolution was obtained in 7.5% Beta-HSCD. C. The capillary length was increased from 20 to 30 cm to the detector (40 cm total). D. Voltage injection from the 10% solution gave excellent sensitivity, resolution and peak shape and the sample had to be diluted 20 to 1 for the final purity determination. E. Low level purity determination result was made possible with HSCDs and voltage injection from a solution containing 400 ng/μL of the API and 0.4 ng/μL of each enantiomer. Method development was completed in less than 3 days. D Dilution 20/1 of the 10% Solution Drug or Metabolite Resolution System* Drug or Metabolite Resolution System* Acebutolol 2.4 Gamma Fluoxetine, Nor- 9.8 Gamma Adrenaline, Nor- (Norepinephrine) 3.5 Gamma 2.5 Glutethimide 11.8 Gamma Aminorex, Cis-4-methyl- 4.5 Gamma Ketamine 2.2 Gamma Amphetamine 33.2 Gamma Ketamine, Nor- 4.5 Alpha Amphetamine, 2,3-Dimethoxy- 16.6 Gamma Labetolol 5.1/2.9/2.1*** Gamma 2.5 Amphetamine, 2,4-Dimethoxy- 22.5 Gamma MBDB 7.5 Gamma Amphetamine, 2,5-Dimethoxy- 17.2 Gamma MDA, 2,3- 16.7 Gamma Amphetamine, 2,5-Dimethoxy-4-bromo- 9.9 Beta MDA, 3,4- 14.6 Gamma Amphetamine, 2,5-Dimethoxy-4-ethyl- 11.6 Gamma MDEA, 3,4- 7.1 Gamma Amphetamine, 2,5-Dimethoxy-4-methyl- 13.8 Gamma MDMA, 2,3- 9.7 Gamma Amphetamine, 2,5-Dimethoxy-4-propyl- 6.0 Gamma MDMA, 3,4- 7.8 Gamma Amphetamine, 2,6-Dimethoxy- 4.5 Gamma Methadone 26.6 Beta Amphetamine, 3,4-Dimethoxy- 14.4 Gamma Methamphetamine 11.8 Gamma Amphetamine, 3,5-Dimethoxy- 4.6 Gamma Methoxamine 44.4 Gamma Amphetamine, 3-Methoxy-4,5-methylenedioxy- 4.6 Gamma Methylphenidate 14.5 Gamma Amphetamine, N-Ethyl- 14.7 Gamma Metoprolol 4.2 Alpha 2.5 Amphetamine, 4-Methylthio- (4-MTA) 13.4 Gamma Mexilitine 2.7 Gamma 7.5 Amphetamine, Hydroxy- 30.6 Gamma Midazolam 3.1 Gamma Atenolol 3.4 Gamma Mirtazapine 5.4 Gamma Bisoprolol 2.2 Gamma 2.5 Mirtazepine, N-Desmethyl 7.5 Gamma Brompheniramine, Dinor- 0.8 Beta 7.5 Nadolol 2.6/1.3/split*** Gamma Brompheniramine, Nor- 1.0 Beta Nefopam 7.6 Alpha Bupropion 10.1 Alpha Oxprenolol 10.0 Beta Bupropion, Erythroamino- 7.5 Gamma Pentazocine 7.2 Gamma 7.5 Bupropion, Hydroxy- 6.3 Beta Pheniramine 2.8 Beta 7.5 Bupropion, Threoamino- 7.6 Alpha Phenmetrazine 19.5 Alpha Butriptyline, N-desmethyl- 1.1 Alpha Phenylephrine, N-Desmethyl- 3.6 Alpha Chloroquine, N,N,-Didesethyl- 1.9 Gamma 7.5 Phenylpropanolamine 42.6 Gamma Chloroquine, N-Desethyl- 1.1 Alpha Pindolol 2.0 Beta 7.5 Chlorpheniramine 2.5 Beta 7.5 PMA (p-Methoxyamphetamine) 25.3 Gamma Chlorpheniramine, Dinor- 1.0 Beta 7.5 PMMA (p-Methoxymethamphetamine) 13.1 Gamma Chlorpheniramine, Nor- 1.1 Beta 7.5 Propranolol 4.3 Alpha 2.5 Citalopram 11.1 Gamma Pronethalol 2.5 Alpha 2.5 Citalopram N-Oxide 11.0 Gamma Propoxyphene 7.3 Alpha Citalopram, Dinor- 8.0 Gamma Pseudoephedrine 5.2 Gamma Citalopram, Nor- 8.0 Gamma Quetiapine 4.4 Gamma Cyclazocine 3.8 Beta Quinidine 2.3 Alpha Cyclobenzaprine 1.9 Gamma 7.5 Salbutamol 8.3 Beta Cyclobenzaprine, N-Desmethyl- 5.4 Alpha Tetramisole 3.6 Gamma Desloratadine 6.4 Gamma Tramadol 13.3 Gamma Dihydro-N,N-dimethyl-5-methylene- ** 3.2 Alpha Tramadol, Nor- 10.3 Gamma Disopyramide, p-Cl 4.7 Beta Trimipramine 7.3 Alpha Disopyramide, N-Dealkylated- 4.6 Alpha Trimipramine, Nor- 2.0 Alpha Doxapram 7.2 Gamma Venlafaxine 5.5 Gamma Doxylamine 2.2 Gamma 7.5 Venlafaxine, O-Desmethyl- 4.3 Gamma EDDP (Methadone Mtb.) 3.0 Beta 7.5 Verapamil 7.1 Alpha EMDP (Methadone Mtb.) 7.5 Gamma Verapamil, Nor- 6.9 Alpha Ephedrine 6.1 Alpha Zopiclone 24.0 Gamma Ephedrine, Hydroxy 15.6 Gamma Zopiclone N-Oxide 23.6 Gamma Esmolol 3.1 Gamma Zopiclone, Nor- 31.6 Gamma Fluoxetine 12.0 Alpha 2.5 * All systems 5% HSCD unless indicated otherwise ** Dihydro-N,N-dimethyl-5-methylene-5H-dibenzocycloheptene-10-ethanamine, 10,11- *** Compound with 2 chiral centers B C PDA Detection of Enantiomers & API E A

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  • Rapid Enantiomeric Separation of Basic Drugs and Metabolites:A Universal Strategy for Ultra-Fast Method Development.

    John C. Hudson and Hans A. Dewald, Beckman Coulter, Inc., Fullerton, CA, USA

    IntroductionIntroduction

    This work describes the use of charged cyclodextrins in a continuing search for a universal strategy for separation of enantiomeric drug substances. The use of highly sulfated cyclodextrins (HSCDs), originally proposed by Chapman and Chen (1), is a well established and efficient approach used in many laboratories worldwide. In this study, a group of compounds was selected from a set of drugs and metabolites of pharmaceutical and forensic interest (2). This group of compounds was challenging because it included many closely related metabolites of drug substances in addition to the parentdrugs. The results confirmed those of the earlier study (1) andallowed the current strategy to be used as a model for ultra-fast methods development. The strategy has been applied in the determination of drug purity for the pharmaceutical industry. An example of purity analysis illustrates the steps and practical considerations required for a successful outcome.

    Chemicals:Solutions of alpha-, beta- and gamma HSCD at a concentration of 20% w/v and all other reagents were purchased from Beckman Coulter, Fullerton, CA, USA. The reagents were prepared as per the enclosed product documentation.

    Drug and Metabolite Standards:Standards were purchased from Cerilliant Corporation, Round Rock, TX, USA or were obtained as a gift from the Royal Canadian Mounted Police, Forensic Laboratory, Winnipeg, MB, Canada or Dr. Robert Meatherall, St. Boniface Hospital, Winnipeg, MB, Canada.

    Solutions of these drug and metabolite standards were purchased or prepared at a concentration of 1 mg/mL and diluted to 25 ppm (25 ng/µL) in distilled and deionized water.

    Reference Marker:1,3,6,8-Pyrene tetrasulfonate (PTS), 10 mM in water: 2 µL added to each sample.

    Instrument:P/ACETM MDQ Capillary Electrophoresis System (Beckman Coulter, Fullerton, CA) equipped with a Photodiode Array Detector (PDAD) with detection at 200 nm (scanning 190-350) and 32 Karat™ Version 7 Software.Run Buffers: All chiral separations were performed in 5% HSCD in 25 mM triethylammonium phosphate pH 2.5 unless otherwise noted as either run in 2.5% or 7.5% of the HSCD.

    Capillaries and Conditioning:Fused-silica capillaries, 50 µm I.D. x 30 cm (effective length 20 cm) were used in all separations. The columns are rinsed daily with 25 mM lithium acetate containing 0.4% Polyethylene Oxide (PEO,MW 300,000) and 10% ethylene glycol, adjusted to pH 4.75 to speed up column equilibration.

    Applied Voltage:The voltage was set at 15 kV (500 V/cm) resulting in running currents of 140 to 180 µamps for 50 µm I.D. columns.

    Temperatures:Capillary and sample storage = 22oC

    Sample introduction:Pressure injection of 4 s at 0.3 psi or Voltage injection of 10 s at 10 kV.

    Material and MethodsMaterial and Methods

    ResultsResults1. Of the 692 compounds in a library used in forensic drugs screening (2), 101 were known to be racemic compounds and were used in this study.

    2. At a concentration of 5% HSCD, 73 of the compounds were resolved at a resolution of 2 or higher.

    3. Twenty-eight (28) of the 101 compounds were selected for additional runs at a concentration of 2.5 and 7.5% of each HSCD to further improve resolution. As a result of these runs, a total of 94% of the 101 compounds were resolved at 2 or greater.

    4. Examples of the excellent resolution that can be achieved are shown in Figures 1 and 2.

    Table 1: Resolution and HSCD Systems for 101 Basic Drugs and Metabolites

    ConclusionConclusionFinding a universal method for chiral separations has been a challenge for many years. An important group of drugs and metabolites, expected to be frequently detected because of widespread use by the general population, was used to evaluate the proposed universal strategy. These 101 racemic drugs and metabolites are of interest to both the pharmaceutical and forensic communities. The compounds were rapidly screened and resolved with resolutions of 2 or greater for over 94% of the group.

    ReferencesReferences1. Chapman, J.D and A-F. Chen, LCGC Europe, January 33 - 37 (2001)

    2. Hudson, J.C. et al., Can. Soc. Forens. Sci., 31(1) 1 - 29 (1998)

    Figure 3: Rapid Method Development for Purity Analysis Using Highly Sulfated Cyclodextrins

    Some elements of this poster were presented at: CE in the Biotechnology & Pharmaceuticals Industries 10th Symposium on the Practical Applications for the Analysis of Proteins, Nucleotides and Small Molecules October 12-16, 2008 and at HPLC 2008, Baltimore, MD, May 10-16, 2008.

    For Research Use Only; not for use in diagnostic procedures.

    .

    M in u te s1 . 5 2 . 0 2 . 5 3 . 0 3 . 5 4 . 0 4 . 5 5 . 0 5 . 5 6 . 0 6 . 5 7 . 0 7 . 5 8 . 0

    AU

    0 . 0 0 0

    0 . 0 0 5

    0 . 0 1 0

    0 . 0 1 5

    0 . 0 2 0

    0 . 0 2 5

    0 . 0 3 0

    µA

    - 1 6 0

    -1 4 0

    -1 2 0

    -1 0 0

    -8 0

    -6 0

    -4 0

    -2 0

    0

    O-Desmethylvenlafaxine Venlafaxine

    PTS

    Figure 2: Venlafaxine and Metabolite in 5% Gamma-HSCD

    Figure 1: Methoxamine in 5% Gamma-HSCD

    5. This strategy was applied to a very complex racemic drug containing four chiral centers. Prior to this, the existing method used a chromatographic approach where the enantiomers were poorly resolved. To fully resolve the Active Pharmaceutical Ingredient (API) and 3 enantiomers, this systematic process was applied as follows and is illustrated in Figure 3.

    Refer to steps A to E in Figure 3 (below): A. Pressure injection of the three enantiomers) at 10% of the API run in each HSCD at 5% was performed. The starting

    concentation of the API was 400 nanograms per microlitre in water.B. The best resolution between 5% systems, was obtained in Beta-HSCD. Improved resolution was obtained in 7.5% Beta-HSCD. C. The capillary length was increased from 20 to 30 cm to the detector (40 cm total). D. Voltage injection from the 10% solution gave excellent sensitivity, resolution and peak shape and the sample had to be diluted 20

    to 1 for the final purity determination. E. Low level purity determination result was made possible with HSCDs and voltage injection from a solution containing 400 ng/µL

    of the API and 0.4 ng/µL of each enantiomer.Method development was completed in less than 3 days.

    DDilution 20/1 of

    the 10%Solution

    Drug or Metabolite Resolution System* Drug or Metabolite Resolution System*Acebutolol 2.4 Gamma Fluoxetine, Nor- 9.8 GammaAdrenaline, Nor- (Norepinephrine) 3.5 Gamma 2.5 Glutethimide 11.8 GammaAminorex, Cis-4-methyl- 4.5 Gamma Ketamine 2.2 GammaAmphetamine 33.2 Gamma Ketamine, Nor- 4.5 AlphaAmphetamine, 2,3-Dimethoxy- 16.6 Gamma Labetolol 5.1/2.9/2.1*** Gamma 2.5Amphetamine, 2,4-Dimethoxy- 22.5 Gamma MBDB 7.5 GammaAmphetamine, 2,5-Dimethoxy- 17.2 Gamma MDA, 2,3- 16.7 GammaAmphetamine, 2,5-Dimethoxy-4-bromo- 9.9 Beta MDA, 3,4- 14.6 GammaAmphetamine, 2,5-Dimethoxy-4-ethyl- 11.6 Gamma MDEA, 3,4- 7.1 GammaAmphetamine, 2,5-Dimethoxy-4-methyl- 13.8 Gamma MDMA, 2,3- 9.7 GammaAmphetamine, 2,5-Dimethoxy-4-propyl- 6.0 Gamma MDMA, 3,4- 7.8 GammaAmphetamine, 2,6-Dimethoxy- 4.5 Gamma Methadone 26.6 BetaAmphetamine, 3,4-Dimethoxy- 14.4 Gamma Methamphetamine 11.8 GammaAmphetamine, 3,5-Dimethoxy- 4.6 Gamma Methoxamine 44.4 GammaAmphetamine, 3-Methoxy-4,5-methylenedioxy- 4.6 Gamma Methylphenidate 14.5 GammaAmphetamine, N-Ethyl- 14.7 Gamma Metoprolol 4.2 Alpha 2.5Amphetamine, 4-Methylthio- (4-MTA) 13.4 Gamma Mexilitine 2.7 Gamma 7.5Amphetamine, Hydroxy- 30.6 Gamma Midazolam 3.1 GammaAtenolol 3.4 Gamma Mirtazapine 5.4 GammaBisoprolol 2.2 Gamma 2.5 Mirtazepine, N-Desmethyl 7.5 GammaBrompheniramine, Dinor- 0.8 Beta 7.5 Nadolol 2.6/1.3/split*** GammaBrompheniramine, Nor- 1.0 Beta Nefopam 7.6 AlphaBupropion 10.1 Alpha Oxprenolol 10.0 BetaBupropion, Erythroamino- 7.5 Gamma Pentazocine 7.2 Gamma 7.5Bupropion, Hydroxy- 6.3 Beta Pheniramine 2.8 Beta 7.5Bupropion, Threoamino- 7.6 Alpha Phenmetrazine 19.5 AlphaButriptyline, N-desmethyl- 1.1 Alpha Phenylephrine, N-Desmethyl- 3.6 AlphaChloroquine, N,N,-Didesethyl- 1.9 Gamma 7.5 Phenylpropanolamine 42.6 GammaChloroquine, N-Desethyl- 1.1 Alpha Pindolol 2.0 Beta 7.5Chlorpheniramine 2.5 Beta 7.5 PMA (p-Methoxyamphetamine) 25.3 GammaChlorpheniramine, Dinor- 1.0 Beta 7.5 PMMA (p-Methoxymethamphetamine) 13.1 GammaChlorpheniramine, Nor- 1.1 Beta 7.5 Propranolol 4.3 Alpha 2.5Citalopram 11.1 Gamma Pronethalol 2.5 Alpha 2.5Citalopram N-Oxide 11.0 Gamma Propoxyphene 7.3 AlphaCitalopram, Dinor- 8.0 Gamma Pseudoephedrine 5.2 GammaCitalopram, Nor- 8.0 Gamma Quetiapine 4.4 GammaCyclazocine 3.8 Beta Quinidine 2.3 AlphaCyclobenzaprine 1.9 Gamma 7.5 Salbutamol 8.3 BetaCyclobenzaprine, N-Desmethyl- 5.4 Alpha Tetramisole 3.6 GammaDesloratadine 6.4 Gamma Tramadol 13.3 GammaDihydro-N,N-dimethyl-5-methylene- ** 3.2 Alpha Tramadol, Nor- 10.3 GammaDisopyramide, p-Cl 4.7 Beta Trimipramine 7.3 AlphaDisopyramide, N-Dealkylated- 4.6 Alpha Trimipramine, Nor- 2.0 AlphaDoxapram 7.2 Gamma Venlafaxine 5.5 GammaDoxylamine 2.2 Gamma 7.5 Venlafaxine, O-Desmethyl- 4.3 GammaEDDP (Methadone Mtb.) 3.0 Beta 7.5 Verapamil 7.1 AlphaEMDP (Methadone Mtb.) 7.5 Gamma Verapamil, Nor- 6.9 AlphaEphedrine 6.1 Alpha Zopiclone 24.0 GammaEphedrine, Hydroxy 15.6 Gamma Zopiclone N-Oxide 23.6 GammaEsmolol 3.1 Gamma Zopiclone, Nor- 31.6 GammaFluoxetine 12.0 Alpha 2.5

    * All systems 5% HSCD unless indicated otherwise ** Dihydro-N,N-dimethyl-5-methylene-5H-dibenzocycloheptene-10-ethanamine, 10,11-*** Compound with 2 chiral centers

    BC

    PDA Detection of Enantiomers & API

    E

    A

    Dilution 20/1 of

    the 10% Solution

    Rapid Enantiomeric Separation of Basic Drugs and Metabolites:

    A Universal Strategy for Ultra-Fast Method Development.

    John C. Hudson and Hans A. Dewald,

    Beckman Coulter, Inc., Fullerton, CA, USA

    Introduction

    This work describes the use of charged cyclodextrins in a continuing search for a universal strategy for separation of enantiomeric drug substances. The use of highly sulfated cyclodextrins (HSCDs), originally proposed by Chapman and Chen (1), is a well established and efficient approach used in many laboratories worldwide. In this study, a group of compounds was selected from a set of drugs and metabolites of pharmaceutical and forensic interest (2). This group of compounds was challenging because it included many closely related metabolites of drug substances in addition to the parent drugs. The results confirmed those of the earlier study (1) and allowed the current strategy to be used as a model for ultra-fast methods development. The strategy has been applied in the determination of drug purity for the pharmaceutical industry. An example of purity analysis illustrates the steps and practical considerations required for a successful outcome.

    Chemicals:

    Solutions of alpha-, beta- and gamma HSCD at a concentration of 20% w/v and all other reagents were purchased from Beckman Coulter, Fullerton, CA, USA. The reagents were prepared as per the enclosed product documentation.

    Drug and Metabolite Standards:

    Standards were purchased from Cerilliant Corporation, Round Rock, TX, USA or were obtained as a gift from the Royal Canadian Mounted Police, Forensic Laboratory, Winnipeg, MB, Canada or Dr. Robert Meatherall, St. Boniface Hospital, Winnipeg, MB, Canada.

    Solutions of these drug and metabolite standards were purchased or prepared at a concentration of 1 mg/mL and diluted to 25 ppm (25 ng/µL) in distilled and deionized water.

    Reference Marker:

    1,3,6,8-Pyrene tetrasulfonate (PTS), 10 mM in water:

    2 µL added to each sample.

    Instrument:

    P/ACETM MDQ Capillary Electrophoresis System (Beckman Coulter, Fullerton, CA) equipped with a Photodiode Array Detector (PDAD) with detection at 200 nm (scanning 190-350) and 32 Karat™ Version 7 Software.

    Run Buffers: All chiral separations were performed in 5% HSCD in 25 mM triethylammonium phosphate pH 2.5 unless otherwise noted as either run in 2.5% or 7.5% of the HSCD.

    Capillaries and Conditioning:

    Fused-silica capillaries, 50 µm I.D. x 30 cm (effective length 20 cm) were used in all separations. The columns are rinsed daily with 25 mM lithium acetate containing 0.4% Polyethylene Oxide (PEO,MW 300,000) and 10% ethylene glycol, adjusted to pH 4.75 to speed up column equilibration.

    Applied Voltage:

    The voltage was set at 15 kV (500 V/cm) resulting in running currents of 140 to 180 µamps for 50 µm I.D. columns.

    Temperatures:

    Capillary and sample storage = 22oC

    Sample introduction:

    Pressure injection of 4 s at 0.3 psi or

    Voltage injection of 10 s at 10 kV.

    Material and Methods

    Results

    1. Of the 692 compounds in a library used in forensic drugs screening (2), 101 were known to be racemic compounds and were used in this study.

    2. At a concentration of 5% HSCD, 73 of the compounds were resolved at a resolution of 2 or higher.

    3. Twenty-eight (28) of the 101 compounds were selected for additional runs at a concentration of 2.5 and 7.5% of each HSCD to further improve resolution. As a result of these runs, a total of 94% of the 101 compounds were resolved at 2 or greater.

    4. Examples of the excellent resolution that can be achieved are shown in Figures 1 and 2.

    Table 1: Resolution and HSCD Systems for 101 Basic Drugs and Metabolites

    Conclusion

    Finding a universal method for chiral separations has been a challenge for many years. An important group of drugs and metabolites, expected to be frequently detected because of widespread use by the general population, was used to evaluate the proposed universal strategy. These 101 racemic drugs and metabolites are of interest to both the pharmaceutical and forensic communities. The compounds were rapidly screened and resolved with resolutions of 2 or greater for over 94% of the group.

    References

    1. Chapman, J.D and A-F. Chen, LCGC Europe, January 33 - 37 (2001)

    2. Hudson, J.C. et al., Can. Soc. Forens. Sci., 31(1) 1 - 29 (1998)

    Figure 3: Rapid Method Development for Purity Analysis Using Highly Sulfated Cyclodextrins

    Some elements of this poster were presented at: CE in the Biotechnology & Pharmaceuticals Industries 10th Symposium on the Practical Applications for the Analysis of Proteins, Nucleotides and Small Molecules October 12-16, 2008 and at HPLC 2008, Baltimore, MD, May 10-16, 2008.

    For Research Use Only; not for use in diagnostic procedures.

    .

    O-Desmethylvenlafaxine

    Venlafaxine

    PTS

    Figure 2: Venlafaxine and Metabolite in 5% Gamma-HSCD

    Figure 1: Methoxamine in 5% Gamma-HSCD

    5. This strategy was applied to a very complex racemic drug containing four chiral centers. Prior to this, the existing method used a chromatographic approach where the enantiomers were poorly resolved. To fully resolve the Active Pharmaceutical Ingredient (API) and 3 enantiomers, this systematic process was applied as follows and is illustrated in Figure 3.

    Refer to steps A to E in Figure 3 (below):

    A. Pressure injection of the three enantiomers) at 10% of the API run in each HSCD at 5% was performed. The starting concentation of the API was 400 nanograms per microlitre in water.

    B. The best resolution between 5% systems, was obtained in Beta-HSCD. Improved resolution was obtained in 7.5% Beta-HSCD.

    C. The capillary length was increased from 20 to 30 cm to the detector (40 cm total).

    D. Voltage injection from the 10% solution gave excellent sensitivity, resolution and peak shape and the sample had to be diluted 20 to 1 for the final purity determination.

    E. Low level purity determination result was made possible with HSCDs and voltage injection from a solution containing 400 ng/µL of the API and 0.4 ng/µL of each enantiomer.

    Method development was completed in less than 3 days.

    D

    B

    C

    PDA Detection of Enantiomers & API

    E

    A

    Drug or Metabolite Resolution System* Drug or Metabolite Resolution System*

    Acebutolol 2.4Gamma Fluoxetine, Nor- 9.8Gamma

    Adrenaline, Nor- (Norepinephrine) 3.5Gamma 2.5 Glutethimide 11.8Gamma

    Aminorex, Cis-4-methyl- 4.5Gamma Ketamine 2.2Gamma

    Amphetamine 33.2Gamma Ketamine, Nor- 4.5Alpha

    Amphetamine, 2,3-Dimethoxy- 16.6Gamma Labetolol 5.1/2.9/2.1*** Gamma 2.5

    Amphetamine, 2,4-Dimethoxy- 22.5Gamma MBDB 7.5Gamma

    Amphetamine, 2,5-Dimethoxy- 17.2Gamma MDA, 2,3- 16.7Gamma

    Amphetamine, 2,5-Dimethoxy-4-bromo- 9.9Beta MDA, 3,4- 14.6Gamma

    Amphetamine, 2,5-Dimethoxy-4-ethyl- 11.6Gamma MDEA, 3,4- 7.1Gamma

    Amphetamine, 2,5-Dimethoxy-4-methyl- 13.8Gamma MDMA, 2,3- 9.7Gamma

    Amphetamine, 2,5-Dimethoxy-4-propyl- 6.0Gamma MDMA, 3,4- 7.8Gamma

    Amphetamine, 2,6-Dimethoxy- 4.5Gamma Methadone 26.6Beta

    Amphetamine, 3,4-Dimethoxy- 14.4Gamma Methamphetamine 11.8Gamma

    Amphetamine, 3,5-Dimethoxy- 4.6Gamma Methoxamine 44.4Gamma

    Amphetamine, 3-Methoxy-4,5-methylenedioxy- 4.6Gamma Methylphenidate 14.5Gamma

    Amphetamine, N-Ethyl- 14.7Gamma Metoprolol 4.2Alpha 2.5

    Amphetamine, 4-Methylthio- (4-MTA) 13.4Gamma Mexilitine 2.7Gamma 7.5

    Amphetamine, Hydroxy- 30.6Gamma Midazolam 3.1Gamma

    Atenolol 3.4Gamma Mirtazapine 5.4Gamma

    Bisoprolol 2.2Gamma 2.5 Mirtazepine, N-Desmethyl 7.5Gamma

    Brompheniramine, Dinor- 0.8Beta 7.5 Nadolol 2.6/1.3/split*** Gamma

    Brompheniramine, Nor- 1.0Beta Nefopam 7.6Alpha

    Bupropion 10.1Alpha Oxprenolol 10.0Beta

    Bupropion, Erythroamino- 7.5Gamma Pentazocine 7.2Gamma 7.5

    Bupropion, Hydroxy- 6.3Beta Pheniramine 2.8Beta 7.5

    Bupropion, Threoamino- 7.6Alpha Phenmetrazine 19.5Alpha

    Butriptyline, N-desmethyl- 1.1Alpha Phenylephrine, N-Desmethyl- 3.6Alpha

    Chloroquine, N,N,-Didesethyl- 1.9Gamma 7.5 Phenylpropanolamine 42.6Gamma

    Chloroquine, N-Desethyl- 1.1Alpha Pindolol 2.0Beta 7.5

    Chlorpheniramine 2.5Beta 7.5 PMA (p-Methoxyamphetamine) 25.3Gamma

    Chlorpheniramine, Dinor- 1.0Beta 7.5 PMMA (p-Methoxymethamphetamine) 13.1Gamma

    Chlorpheniramine, Nor- 1.1Beta 7.5 Propranolol 4.3Alpha 2.5

    Citalopram 11.1Gamma Pronethalol 2.5Alpha 2.5

    Citalopram N-Oxide 11.0Gamma Propoxyphene 7.3Alpha

    Citalopram, Dinor- 8.0Gamma Pseudoephedrine 5.2Gamma

    Citalopram, Nor- 8.0Gamma Quetiapine 4.4Gamma

    Cyclazocine 3.8Beta Quinidine 2.3Alpha

    Cyclobenzaprine 1.9Gamma 7.5 Salbutamol 8.3Beta

    Cyclobenzaprine, N-Desmethyl- 5.4Alpha Tetramisole 3.6Gamma

    Desloratadine 6.4Gamma Tramadol 13.3Gamma

    Dihydro-N,N-dimethyl-5-methylene- ** 3.2Alpha Tramadol, Nor- 10.3Gamma

    Disopyramide, p-Cl 4.7Beta Trimipramine 7.3Alpha

    Disopyramide, N-Dealkylated- 4.6Alpha Trimipramine, Nor- 2.0Alpha

    Doxapram 7.2Gamma Venlafaxine 5.5Gamma

    Doxylamine 2.2Gamma 7.5 Venlafaxine, O-Desmethyl- 4.3Gamma

    EDDP (Methadone Mtb.) 3.0Beta 7.5 Verapamil 7.1Alpha

    EMDP (Methadone Mtb.) 7.5Gamma Verapamil, Nor- 6.9Alpha

    Ephedrine 6.1Alpha Zopiclone 24.0Gamma

    Ephedrine, Hydroxy 15.6Gamma Zopiclone N-Oxide 23.6Gamma

    Esmolol 3.1Gamma Zopiclone, Nor- 31.6Gamma

    Fluoxetine 12.0Alpha 2.5

    * All systems 5% HSCD unless indicated otherwise ** Dihydro-N,N-dimethyl-5-methylene-5H-dibenzocycloheptene-10-ethanamine, 10,11-

    *** Compound with 2 chiral centers

    Minutes

    1.5

    2.0

    2.5

    3.0

    3.5

    4.0

    4.5

    5.0

    5.5

    6.0

    6.5

    7.0

    7.5

    8.0

    AU

    0.000

    0.005

    0.010

    0.015

    0.020

    0.025

    0.030

    µA

    -160

    -140

    -120

    -100

    -80

    -60

    -40

    -20

    0

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