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Separation of anaesthetic ketamine and its derivates in PAMAPTAC coated capillaries with tuneable counter-current electroosmotic flow. Talanta 2020; 217:121094. [PMID: 32498904 DOI: 10.1016/j.talanta.2020.121094] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 04/23/2020] [Accepted: 04/25/2020] [Indexed: 02/06/2023]
Abstract
Capillary electrophoretic separation of ketamine, norketamine, hydroxynorketamine, and dehydronorketamine was performed in the counter-current regime under the influence of oppositely-directed electroosmotic flow. For this purpose, the fused silica capillaries were covalently coated with the poly(acrylamide-co-3-acrylamidopropyl trimethylammonium chloride) copolymer (PAMAPTAC). The content of the cationic monomer APTAC in the polymerization mixture varied in the range 0-6 mol. % and the generated electroosmotic flow increased continuously in the 0-20 · 10-9 m2V-1s-1 interval. Importantly, it resulted in improved electrophoretic resolution of ketamine/norketamine, which increased from 0.8 for neutral PAM coating (i.e. 0% PAMAPTAC) to 3.0 for 6% PAMAPTAC. The determination of ketamine and its derivates in rat serum was performed in a 4% PAMAPTAC capillary with an inner diameter of 25 μm. The separation was performed in a 500 mM aqueous solution of acetic acid (pH 2.3). The clinical sample was deproteinized by the addition of acetonitrile to the serum and a large volume of the treated sample was injected directly into the capillary. The achieved limit of detection ranged from 2.2 ng/mL for dehydronorketamine to 4.1 ng/mL for hydroxynorketamine; the intra-day repeatability was 1.0-1.5% for the migration time and 2.8-3.3% for the peak area. The developed methodology was employed for time monitoring of ketamines in rat serum after intra venous administration of low doses of anaesthetic at a level of 2 μg per g of body weight.
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Tůma P, Sommerová B, Vaculín Š. Rapid electrophoretic monitoring of the anaesthetic ketamine and its metabolite norketamine in rat blood using a contactless conductivity detector to study the pharmacokinetics. J Sep Sci 2019; 42:2062-2068. [PMID: 30938060 DOI: 10.1002/jssc.201900116] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/28/2019] [Accepted: 03/28/2019] [Indexed: 01/23/2023]
Abstract
A method of capillary electrophoresis with contactless conductivity detection has been developed for non-enantioselective monitoring the anaesthetic ketamine and its main metabolite norketamine. The separation is performed in a 15 μm capillary with an overall length of 31.5 cm and length to detector of 18 cm; inner surface of the capillary is covered with a commercial coating solution to reduce the electroosmotic flow. In an optimised background electrolyte with composition 2 M acetic acid + 1% v/v coating solution under application of a high voltage of 30 kV, the migration time is 97.1 s for ketamine and 95.8 s for norketamine, with an electrophoretic resolution of 1.2. The attained detection limit was 83 ng/mL (0.3 μmol/L) for ketamine and 75 ng/mL (0.3 μmol/L) for norketamine; the number of theoretic plates for separation of an equimolar model mixture with a concentration of 2 μg/mL was 683 500 plates/m for ketamine and 695 400 plates/m for norketamine. Laboratory preparation of rat blood plasma is based on mixing 10 μL of plasma with 30 μL of acidified acetonitrile, followed by centrifugation. A pharmacokinetic study demonstrated an exponential decrease in the plasma concentration of ketamine after intravenous application and much slower kinetics for intraperitoneal application.
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Affiliation(s)
- Petr Tůma
- Department of Hygiene, Third Faculty of Medicine, Charles University, Prague, Czechia
| | - Blanka Sommerová
- Department of Hygiene, Third Faculty of Medicine, Charles University, Prague, Czechia
| | - Šimon Vaculín
- Department of Physiology, Third Faculty of Medicine, Charles University, Prague, Czechia
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Slepchenko GB, Gindullina TM, Nekhoroshev SV. Capabilities of the electrochemical methods in the determination of narcotic and psychotropic drugs in forensic chemistry materials. JOURNAL OF ANALYTICAL CHEMISTRY 2017. [DOI: 10.1134/s1061934817070127] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Hassanzadeh J, Khataee A, Lotfi R. Sensitive fluorescence and chemiluminescence procedures for methamphetamine detection based on CdS quantum dots. Microchem J 2017. [DOI: 10.1016/j.microc.2017.02.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Han E, Kwon NJ, Feng LY, Li JH, Chung H. Illegal use patterns, side effects, and analytical methods of ketamine. Forensic Sci Int 2016; 268:25-34. [DOI: 10.1016/j.forsciint.2016.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 08/23/2016] [Accepted: 09/02/2016] [Indexed: 12/22/2022]
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6
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Approaching over 10 000-fold sensitivity increase in chiral capillary electrophoresis: Cation-selective exhaustive injection and sweeping cyclodextrin-modified micellar electrokinetic chromatography. Electrophoresis 2016; 37:2970-2976. [DOI: 10.1002/elps.201600324] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 08/07/2016] [Accepted: 08/11/2016] [Indexed: 11/07/2022]
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7
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Chiral separation and determination of ketamine and norketamine in hair by capillary electrophoresis. Forensic Sci Int 2016; 266:304-310. [DOI: 10.1016/j.forsciint.2016.06.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 06/03/2016] [Accepted: 06/10/2016] [Indexed: 11/15/2022]
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8
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Preconcentration and determination of chlordiazepoxide and diazepam drugs using dispersive nanomaterial-ultrasound assisted microextraction method followed by high performance liquid chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1008:146-155. [DOI: 10.1016/j.jchromb.2015.11.043] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 11/20/2015] [Accepted: 11/21/2015] [Indexed: 11/30/2022]
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9
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Ho YH, Wang CC, Hsiao YT, Ko WK, Wu SM. Analysis of ten abused drugs in urine by large volume sample stacking-sweeping capillary electrophoresis with an experimental design strategy. J Chromatogr A 2013; 1295:136-41. [PMID: 23683398 DOI: 10.1016/j.chroma.2013.04.057] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 04/16/2013] [Accepted: 04/18/2013] [Indexed: 11/18/2022]
Abstract
A statistical tool equipped with Plackett-Burman design (PBD) and central composite design (CCD) was used for fast stacking analysis of ten frequently consumed drugs, namely codeine, morphine, methamphetamine, ketamine, alprazolam, clonazepam, diazepam, flunitrazepam, nitrazepam and oxazepam, by capillary electrophoresis (CE). This statistical design is expected to help quick analysis with few procedures, avoiding tedious work required because of the large number of variables or parameters. A large volume sample stacking (LVSS)-sweeping CE is developed for concentrating and analyzing the 10 abused drugs. First, phosphate buffer (50 mM, pH 2.3) containing methanol was filled into a capillary and then the extracted urine sample was loaded (1 psi, 200 s) to enhance sensitivity. The sweeping and separating steps were completed simultaneously by phosphate buffer (50 mM, pH 2.3) containing methanol and sodium dodecyl sulfate, within 15 min. Better resolution was obtained by the experimental design than the "one factor at a time" (OFAT) approach. During method validation, calibration plots were linear (r>0.998), over a range of 25-1500 ng/mL for the six benzodiazepines, methamphetamine and ketamine, and 50-3000 ng/mL for codeine and morphine. The RSD of precision and absolute RE of accuracy in intra-day and inter-day assays were below 14.54% and 16.61%, respectively. The minimum limits for detection (S/N=3) of analytes were in the range of 7.5-30 ng/mL. This stacking method increased sensitivity more than 200-fold and can be applied for detection of the presence of methamphetamine in an abuser's urine (3600 ng/mL), which was confirmed by GC-MS. The method is considered feasible for fast screening of abused drugs in urine.
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Affiliation(s)
- Yu-Hsiang Ho
- School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan
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Determination of ketamine and norketamine in hair by micropulverized extraction and liquid chromatography–high resolution mass spectrometry. Forensic Sci Int 2013; 226:88-93. [DOI: 10.1016/j.forsciint.2012.12.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 12/11/2012] [Accepted: 12/14/2012] [Indexed: 11/24/2022]
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11
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Anres P, Delaunay N, Vial J, Thormann W, Gareil P. Influence of high-conductivity buffer composition on field-enhanced sample injection coupled to sweeping in CE. Electrophoresis 2013; 34:353-62. [DOI: 10.1002/elps.201200374] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Revised: 09/25/2012] [Accepted: 09/25/2012] [Indexed: 11/08/2022]
Affiliation(s)
| | | | | | - Wolfgang Thormann
- Clinical Pharmacology Laboratory, Institute for Infectious Diseases; University of Bern; Bern; Switzerland
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12
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Determination of RNA degradation by capillary electrophoresis with cyan light-emitted diode-induced fluorescence. J Chromatogr A 2012; 1239:78-84. [DOI: 10.1016/j.chroma.2012.03.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2012] [Revised: 03/10/2012] [Accepted: 03/21/2012] [Indexed: 11/18/2022]
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13
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Anres P, Delaunay N, Vial J, Gareil P. A chemometric approach for the elucidation of the parameter impact in the hyphenation of field-enhanced sample injection and sweeping in capillary electrophoresis. Electrophoresis 2012; 33:1169-81. [DOI: 10.1002/elps.201100483] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography for the analysis of methadone and its metabolites in serum of heroin addicts. J Chromatogr A 2011; 1218:6832-7. [DOI: 10.1016/j.chroma.2011.07.086] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2011] [Revised: 07/25/2011] [Accepted: 07/26/2011] [Indexed: 11/18/2022]
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15
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El Deeb S, Iriban MA, Gust R. MEKC as a powerful growing analytical technique. Electrophoresis 2010; 32:166-83. [PMID: 21171121 DOI: 10.1002/elps.201000398] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 09/30/2010] [Accepted: 09/30/2010] [Indexed: 11/11/2022]
Abstract
This review summarizes the principle and the developments in MEKC in terms of separation power, sensitivity, and detection approaches more than 25 years after its appearance. Newly used surfactants are mentioned. Classical and new sample concentration techniques in MEKC are described. The different detection approaches in MEKC with advantages, limitations, and future prospects are also discussed. This review highlights the wider application of MEKC in different analytical fields. Various recent selected applications of this technique in different analytical fields are reported.
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Affiliation(s)
- Sami El Deeb
- Institute of Pharmacy, Freie Universität Berlin, Berlin, Germany
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Zhang W, Su P, Yang Y, Guo Z. DEVELOPMENT OF A SENSITIVE BIOTIN–AVIDIN AMPLIFIED ENZYME-LINKED IMMUNOSORBENT ASSAY FOR THE DETERMINATION OF KETAMINE IN BIOLOGICAL SAMPLES. J Immunoassay Immunochem 2010; 31:205-16. [DOI: 10.1080/10739149.2010.488613] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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17
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Chen SJ, Cheng FC, Jen JF. On-line microdialysis coupled solid-phase extraction to decrease matrix interference in the HPLC analysis of urinary ketamine and its metabolites. J Sep Sci 2010; 33:2010-6. [DOI: 10.1002/jssc.201000002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Bo X, Xie W, Ndamanisha J, Bai J, Guo L. Electrochemical Oxidation and Detection of Morphine at Ordered Mesoporous Carbon Modified Glassy Carbon Electrodes. ELECTROANAL 2009. [DOI: 10.1002/elan.200900265] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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On-line stacking and sweeping capillary electrophoresis for detecting heroin metabolites in human urine. J Chromatogr A 2009; 1216:7570-5. [DOI: 10.1016/j.chroma.2009.04.058] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Revised: 04/11/2009] [Accepted: 04/17/2009] [Indexed: 11/21/2022]
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20
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Abstract
Sample stacking techniques remain an important tool for enhancement of the selectivity and sensitivity of analyses in contemporary CZE. This contribution reviews new knowledge on this topic published since 2006. It is organized according to the operational principles used, which include concentration adjustment, application of a pH step, MEKC and sweeping, and transient ITP. Techniques combining several of these principles and comparative studies are also included.
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Affiliation(s)
- Zdena Malá
- Institute of Analytical Chemistry of the ASCR, Brno, Czech Republic
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21
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Chiang JF, Hsiao YT, Ko WK, Wu SM. Analysis of multiple abused drugs and hypnotics in urine by sweeping CE. Electrophoresis 2009; 30:2583-9. [DOI: 10.1002/elps.200900067] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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22
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Kartsova LA, Bessonova EA. Preconcentration techniques in capillary electrophoresis. JOURNAL OF ANALYTICAL CHEMISTRY 2009. [DOI: 10.1134/s1061934809040029] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Aranas AT, Guidote AM, Quirino JP. Sweeping and new on-line sample preconcentration techniques in capillary electrophoresis. Anal Bioanal Chem 2009; 394:175-85. [PMID: 19255749 DOI: 10.1007/s00216-009-2646-7] [Citation(s) in RCA: 147] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2008] [Revised: 01/09/2009] [Accepted: 01/21/2009] [Indexed: 11/24/2022]
Abstract
Sweeping is a powerful on-line sample preconcentration technique that improves the concentration sensitivity of capillary electrophoresis (CE). This approach is designed to focus the analyte into narrow bands within the capillary, thereby increasing the sample volume that can be injected, without any loss of CE efficiency. It utilizes the interactions between an additive [i.e., a pseudostationary phase (PS) or complexing agent] in the separation buffer and the sample in a matrix that is devoid of the additive used. The accumulation occurs due to chromatographic partitioning, complexation or any interaction between analytes and the additive through electrophoresis. The extent of the preconcentration is dependent on the strength of interaction involved. Both charged and neutral analytes can be preconcentrated. Remarkable improvements--up to several thousandfold--in detection sensitivity have been achieved. This suggests that sweeping is a superior and general approach to on-line sample preconcentration in CE. The focusing mechanism of sweeping under different experimental conditions and its combination with other on-line preconcentration techniques are discussed in this review. The recently introduced techniques of transient trapping (tr-trapping) and analyte focusing by micelle collapse (AFMC) as well as other novel approaches to on-line sample preconcentration are also described.
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Affiliation(s)
- Agnes T Aranas
- Department of Chemistry, Ateneo de Davao University, School of Arts and Sciences, Davao City, 8000, Philippines
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Quirino JP. Micelle to solvent stacking of organic cations in capillary zone electrophoresis with electrospray ionization mass spectrometry. J Chromatogr A 2009; 1216:294-9. [DOI: 10.1016/j.chroma.2008.11.062] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2008] [Revised: 11/13/2008] [Accepted: 11/17/2008] [Indexed: 01/21/2023]
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25
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Silva M. Micellar electrokinetic chromatography: Methodological and instrumental advances focused on practical aspects. Electrophoresis 2009; 30:50-64. [DOI: 10.1002/elps.200800414] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Breadmore MC, Thabano JRE, Dawod M, Kazarian AA, Quirino JP, Guijt RM. Recent advances in enhancing the sensitivity of electrophoresis and electrochromatography in capillaries and microchips (2006-2008). Electrophoresis 2009; 30:230-48. [DOI: 10.1002/elps.200800435] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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27
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Su HL, Hsieh YZ. Using cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography to determine selective serotonin reuptake inhibitors. J Chromatogr A 2008; 1209:253-9. [DOI: 10.1016/j.chroma.2008.08.087] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2008] [Revised: 08/22/2008] [Accepted: 08/26/2008] [Indexed: 11/29/2022]
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Liu YM, Cao JT, Zheng YL, Chen YH. Sensitive determination of norepinephrine, synephrine, and isoproterenol by capillary electrophoresis with indirect electrochemiluminescence detection. J Sep Sci 2008; 31:2463-9. [DOI: 10.1002/jssc.200800034] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Lin YH, Chiang JF, Lee MR, Lee RJ, Ko WK, Wu SM. Cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography for analysis of morphine and its four metabolites in human urine. Electrophoresis 2008; 29:2340-7. [DOI: 10.1002/elps.200700825] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Simpson SL, Quirino JP, Terabe S. On-line sample preconcentration in capillary electrophoresis. J Chromatogr A 2008; 1184:504-41. [DOI: 10.1016/j.chroma.2007.11.001] [Citation(s) in RCA: 269] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2007] [Revised: 10/30/2007] [Accepted: 11/01/2007] [Indexed: 02/06/2023]
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Abstract
This paper is the 29th consecutive installment of the annual review of research concerning the endogenous opioid system, now spanning 30 years of research. It summarizes papers published during 2006 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (Section 2), and the roles of these opioid peptides and receptors in pain and analgesia (Section 3); stress and social status (Section 4); tolerance and dependence (Section 5); learning and memory (Section 6); eating and drinking (Section 7); alcohol and drugs of abuse (Section 8); sexual activity and hormones, pregnancy, development and endocrinology (Section 9); mental illness and mood (Section 10); seizures and neurological disorders (Section 11); electrical-related activity and neurophysiology (Section 12); general activity and locomotion (Section 13); gastrointestinal, renal and hepatic functions (Section 14); cardiovascular responses (Section 15); respiration and thermoregulation (Section 16); and immunological responses (Section 17).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, CUNY, 65-30 Kissena Blvd., Flushing, NY 11367, United States.
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Lu CC, Jong YJ, Ferrance J, Ko WK, Wu SM. On-line sample stacking and short-end injection CE for the determination of fluoxetine and norfluoxetine in plasma: Method development and validation using experimental designs. Electrophoresis 2007; 28:3290-5. [PMID: 17696212 DOI: 10.1002/elps.200700187] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A short-end injection CE method combining field-amplified sample stacking (FASS) is presented for the analysis of fluoxetine (FL) and norfluoxetine in plasma. In this study, FASS enhanced the sensitivity about 1100-fold, while short-end injection reduced the analysis time to less than 4 min. Parameters involved in the separations were investigated using a central composite design (CCD) and response surface methodology to optimize the separation conditions in a total of only 32 runs. Samples injected into the capillary for 99.9 s at a voltage of -5 kV were stacked in a water plug (0.5 psi, 9 s). Baseline resolution of FL and its major metabolite was achieved using a BGE formulation consisting of phosphate-triethanolamine at low pH, and a separation voltage of -10 kV. Five percent methanol was added as organic modifier to enhance selectivity and resolution. The linear range was between 10 and 500 ng/mL (r >0.9946), covering the expected plasma therapeutic ranges. The LOD in plasma were 4 ng/mL (S/N = 3), a value comparable to that obtained using LC-MS, showing the success of the on-line stacking technique. Our method was also successfully validated in quantification and pharmacokinetic studies with three volunteer plasma samples and could be applied to pharmacogenetic studies.
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Affiliation(s)
- Chia-Chia Lu
- Graduate Institute of Pharmaceutical Science, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
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Lin YH, Lee MR, Lee RJ, Ko WK, Wu SM. Hair analysis for methamphetamine, ketamine, morphine and codeine by cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography. J Chromatogr A 2007; 1145:234-40. [PMID: 17316663 DOI: 10.1016/j.chroma.2007.01.054] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2006] [Revised: 01/10/2007] [Accepted: 01/15/2007] [Indexed: 10/23/2022]
Abstract
We established a capillary electrophoretic method with high sensitivity and specificity for testing hair taken from addicts. After pretreatment of hair sample, the cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography (CSEI-Sweep-MEKC) was used to test for the presence of abused drugs in human hair. These drugs include morphine (M), codeine (C), ketamine (K) and methamphetamine (MA). First, an uncoated fused-silica capillary (40 cm, 50 microm I.D.) was filled with phosphate buffer (50 mM, pH 2.5) containing 30% methanol, followed by high conductivity buffer (100 mM phosphate, 6.9 kPa for 99.9 s). Electrokinetic injection (10 kV, 600 s) was used to load samples and to enhance sensitivity. Stacking steps and separations were performed at -20 kV with detection at 200 nm, using phosphate buffer (25 mM, pH 2.5) containing 20% methanol and 100 mM sodium dodecyl sulfate. Using CSEI-Sweep-MEKC, the analytes could be simultaneously analyzed and have a detection limit down to the level of picogram per milligram hair. During method validation, calibration plots were linear (r > or = 0.999) over a range of 0.15-80 ng/mg hair for MA and K, 0.3-30 ng/mg hair for C and 0.5-50 ng/mg hair for M. The limits of detection were 50 pg/mg hair for MA and K, 100 pg/mg hair for C and 200 pg/mg hair for M (S/N=3, sampling 600 s at 10 kV). Our method was applied for analysis of real hair samples taken from addicts. The addicts' specimens were also analyzed by LC-MS, and showed good coincidence of results. This method has proven feasible for application in detecting trace levels of abused drugs in forensic analysis.
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Affiliation(s)
- Yi-Hui Lin
- Graduate Institute of Pharmaceutical Science, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
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