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Tu Y, Cao J, Zhang M, Liu M, Huang C, Li Y, Wang C. Dual Detection of Temperature And Chiral Amino Acid Using Triphenylamine‐Based Fluorescent Probes. ChemistrySelect 2022. [DOI: 10.1002/slct.202203323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yajing Tu
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 P. R. China
| | - Jian Cao
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 P. R. China
| | - Meijuan Zhang
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 P. R. China
| | - Mingming Liu
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 P. R. China
| | - Cuiping Huang
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 P. R. China
| | - Yanan Li
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 P. R. China
| | - Chuanxiao Wang
- School of Chemistry and Chemical Engineering Shanghai University of Engineering Science 333 Longteng Road Shanghai 201620 P. R. China
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A Novel Enantioseparation and Trace Determination of Chiral Herbicide Flurtamone Using UPLC-MS/MS in Various Food and Environmental Matrices Based on Box-Behnken Design. FOOD ANAL METHOD 2022. [DOI: 10.1007/s12161-022-02368-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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3
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Molecular fingerprint and machine learning to accelerate design of
high‐performance
homochiral metal–organic frameworks. AIChE J 2021. [DOI: 10.1002/aic.17352] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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4
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Nosal DG, Feinstein DL, van Breemen RB. Chiral liquid chromatography-tandem mass spectrometry analysis of superwarfarin rodenticide stereoisomers - Bromadiolone, difenacoum and brodifacoum - In human plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1165:122529. [PMID: 33486217 PMCID: PMC7875153 DOI: 10.1016/j.jchromb.2021.122529] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 12/28/2020] [Accepted: 01/02/2021] [Indexed: 01/08/2023]
Abstract
Superwarfarins are second-generation long-acting anticoagulant rodenticides that can cause unintended human and wildlife toxicity due, in part, to their prolonged half-lives. Commercially available superwarfarin rodenticides are synthesized as racemates with two asymmetric carbons, producing four stereoisomers. To support studies of human plasma half-lives of individual superwarfarin stereoisomers, a method was developed based on LC-MS/MS to separate and quantify stereoisomers of the commercially important superwarfarins bromadiolone, difenacoum and brodifacoum. Human plasma samples were prepared using protein precipitation and centrifugation. Chiral-phase HPLC separation was carried out on-line with tandem mass spectrometric quantitative analysis of the eluting stereoisomers using selected-reaction monitoring with positive ion electrospray on a triple quadrupole mass spectrometer. All four stereoisomers of each superwarfarin were resolved within 12.5 min with calibration curves spanning 2-3 orders of magnitude and lower limits of quantitation between 0.87 and 2.55 ng/mL. This method was used to determine the half-lives of superwarfarin stereoisomers in plasma from patients who had inhaled synthetic cannabinoid products contaminated with superwarfarins. These data may be used to guide the development of safer next generation anticoagulant rodenticides stereoisomers.
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Affiliation(s)
- Daniel G Nosal
- Linus Pauling Institute, Department of Pharmaceutical Sciences, Oregon State University 2900 SW Campus Way, Corvallis, OR 97331, USA
| | - Douglas L Feinstein
- Department of Anesthesiology, University of Illinois at Chicago, 835 South Wolcott Ave, MC513, E720, Chicago, IL 60612, USA
| | - Richard B van Breemen
- Linus Pauling Institute, Department of Pharmaceutical Sciences, Oregon State University 2900 SW Campus Way, Corvallis, OR 97331, USA.
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Wang Z, Liu S, Zhao X, Tian B, Sun X, Zhang J, Gao Y, Shi H, Wang M. Enantioseparation and stereoselective dissipation of the novel chiral fungicide pydiflumetofen by ultra-high-performance liquid chromatography tandem mass spectrometry. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 207:111221. [PMID: 32911181 DOI: 10.1016/j.ecoenv.2020.111221] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 08/20/2020] [Accepted: 08/23/2020] [Indexed: 06/11/2023]
Abstract
Pydiflumetofen is a novel and efficient broad-spectrum chiral fungicide consisting of a pair of enantiomers. A simple and sensitive chiral analytical method was established to determine the enantiomers of this chiral fungicide in food and environmental samples by ultra-high-performance liquid chromatography tandem triple quadrupole mass spectrometry (UHPLC-MS/MS) using QuEChERS method coupled with octadecylsilane-dispersive solid-phase extraction (C18-dSPE) as extraction procedure. The specific optical rotation and the absolute configuration of the enantiomers were identified by polarimetry and electronic circular dichroism (ECD). The elution order of the pydiflumetofen enantiomers on Lux Cellulose-2 was S-(-)-pydiflumetofen and R-(+)-pydiflumetofen. The average recoveries of eleven matrices ranged from 71.3% to 107.4%. The intraday relative standard deviations (RSDs) were less than 11.8%, and the interday RSDs were less than 12.6% for the two enantiomers. Stereoselective dissipation in pakchoi and soil were observed: S-(-)-pydiflumetofen was degraded faster than R-(+)-pydiflumetofen in pakchoi, causing the enantiomer fraction (EF) of the enantiomers to change from 0.50 to 0.42 in 7 days. However, R-(+)-pydiflumetofen was degraded faster than S-(-)-pydiflumetofen in soil, causing the EF of the enantiomers to change from 0.49 to 0.52 in 21 days. This study provides a method for monitoring pydiflumetofen enantiomer residues, which is crucial for improving risk assessments and the development of chiral pesticides.
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Affiliation(s)
- Zhen Wang
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Shiling Liu
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xuejun Zhao
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Baohua Tian
- Fungicide Development Manager, Syngenta (China) Investment Co.,Ltd, Shanghai, 200120, China
| | - Xiaofang Sun
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jing Zhang
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yingying Gao
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Haiyan Shi
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China
| | - Minghua Wang
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing Agricultural University, Nanjing, 210095, China.
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6
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Li S, Liu B, Xue M, Yu J, Guo X. Enantioseparation and determination of flumequine enantiomers in multiple food matrices with chiral liquid chromatography coupled with tandem mass spectrometry. Chirality 2019; 31:968-978. [PMID: 31435970 DOI: 10.1002/chir.23125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 07/20/2019] [Accepted: 08/04/2019] [Indexed: 01/06/2023]
Abstract
The present work firstly described the enantioseparation and determination of flumequine enantiomers in milk, yogurt, chicken, beef, egg, and honey samples by chiral liquid chromatography-tandem mass spectrometry. The enantioseparation was performed under reversed-phase conditions on a Chiralpak IC column at 20°C. The effects of chiral stationary phase, mobile phase components, and column temperature on the separation of flumequine enantiomers have been studied in detail. Target compounds were extracted from six different matrices with individual extraction procedure followed by cleanup using Cleanert C18 solid phase extraction cartridge. Good linearity (R2 >0.9913) was obtained over the concentration range of 0.125 to 12.5 ng g-1 for each enantiomer in matrix-matched standard calibration curves. The limits of detection and limits of quantification of two flumequine enantiomers were 0.015-0.024 and 0.045-0.063 ng g-1 , respectively. The average recoveries of the targeted compounds varied from 82.3 to 110.5%, with relative standard deviation less than 11.7%. The method was successfully applied to the determination of flumequine enantiomers in multiple food matrices, providing a reliable method for evaluating the potential risk in animal productions.
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Affiliation(s)
- Shuang Li
- Department Pharmaceutical Analysis, Institution Shenyang Pharmaceutical University, Shenyang, P. R. China
| | - Beibei Liu
- Department Pharmaceutical Analysis, Institution Shenyang Pharmaceutical University, Shenyang, P. R. China
| | - Mengyao Xue
- Department Pharmaceutical Analysis, Institution Shenyang Pharmaceutical University, Shenyang, P. R. China
| | - Jia Yu
- Department Pharmaceutical Analysis, Institution Shenyang Pharmaceutical University, Shenyang, P. R. China
| | - Xingjie Guo
- Department Pharmaceutical Analysis, Institution Shenyang Pharmaceutical University, Shenyang, P. R. China
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Li L, Gao B, Zhang Z, Yang M, Li X, He Z, Wang M. Stereoselective Separation of the Fungicide Bitertanol Stereoisomers by High-Performance Liquid Chromatography and Their Degradation in Cucumber. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:13303-13309. [PMID: 30495953 DOI: 10.1021/acs.jafc.8b04594] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Bitertanol is a widely used triazole fungicide and consists of four stereoisomers. A new high-performance liquid chromatography (HPLC) method was developed for simultaneous analysis of the four stereoisomers in apple, pear, tomato, cucumber, and soil. The mechanism of separation was explained with molecular docking and effects of thermodynamic parameters on the resolution. The absolute configuration and optical rotation of four stereoisomers were confirmed by X-ray diffraction and HPLC tandem circular dichroism, respectively. A good linearity ( R2 ≥ 0.999) was obtained for four stereoisomers in all matrix-matched calibration curves in the range of 0.02-10 mg/L. The mean recoveries of four stereoisomers in five matrices ranged from 74.6% to 101.0% with an intraday and interday relative standard deviation from 0.6% to 9.9%. Stereoselective degradation of bitertanol in cucumber was observed: (1 R,2 S)-bitertanol and (1 R,2 R)-bitertanol were preferentially degraded with enantiomeric fraction values from 0.5 to 0.43 at 7 d and 0.42 at 5 d, respectively. This research provides a useful tool for the analysis of bitertanol stereoisomers.
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Affiliation(s)
- Lianshan Li
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application , Nanjing Agricultural University , Nanjing 210095 , China
| | - Beibei Gao
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application , Nanjing Agricultural University , Nanjing 210095 , China
| | - Zhaoxian Zhang
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application , Nanjing Agricultural University , Nanjing 210095 , China
| | - Mailun Yang
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application , Nanjing Agricultural University , Nanjing 210095 , China
| | - Xin Li
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application , Nanjing Agricultural University , Nanjing 210095 , China
| | - Zongzhe He
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application , Nanjing Agricultural University , Nanjing 210095 , China
| | - Minghua Wang
- Department of Pesticide Science, College of Plant Protection, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application , Nanjing Agricultural University , Nanjing 210095 , China
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8
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Xiong F, Yang BB, Zhang J, Li L. Enantioseparation, Stereochemical Assignment and Chiral Recognition Mechanism of Sulfoxide-Containing Drugs. Molecules 2018; 23:molecules23102680. [PMID: 30340337 PMCID: PMC6222453 DOI: 10.3390/molecules23102680] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 10/04/2018] [Accepted: 10/15/2018] [Indexed: 01/11/2023] Open
Abstract
The distinct pharmacodynamic and pharmacokinetic properties of enantiopure sulfoxide drugs have stimulated us to systematically investigate their chiral separation, stereochemical assignment, and chiral recognition mechanism. Herein, four clinically widely-used sulfoxide drugs were chosen and optically resolved on various chiral stationary phases (CSPs). Theoretical simulations including electronic circular dichroism (ECD) calculation and molecular docking were adopted to assign the stereochemistry and reveal the underlying chiral recognition mechanism. Our results showed that the sequence of calculated mean binding energies between each pair of enantiomers and CSP matched exactly with experimentally observed enantiomeric elution order (EEO). It was also found that the length of hydrogen bond might contribute dominantly the interaction between two enantiomers and CSP. We hope our study could provide a fresh perspective to explore the stereochemistry and chiral recognition mechanism of chiral drugs.
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Affiliation(s)
- Fei Xiong
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Bei-Bei Yang
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Jie Zhang
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Li Li
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
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9
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Joshi N, Dhamarlapati B, Pillai A, Paulose J, Tan J, Blue LE, Tedrow J, Farrell B. Separation and quantitation of eight isomers in a molecule with three stereogenic centers by normal phase liquid chromatography. J Chromatogr A 2018; 1538:108-111. [DOI: 10.1016/j.chroma.2018.01.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 01/12/2018] [Accepted: 01/15/2018] [Indexed: 11/29/2022]
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10
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Ali I, Suhail M, Asnin L, Aboul-Enein HY. Reverse elution order of β-blockers in chiral separation. J LIQ CHROMATOGR R T 2017. [DOI: 10.1080/10826076.2017.1327443] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Imran Ali
- Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi, India
| | - Mohd. Suhail
- Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi, India
| | - Leonid Asnin
- Perm National Research Polytechnic University, Perm, Russia
| | - Hassan Y. Aboul-Enein
- Department of Pharmaceutical and Medicinal Chemistry, Pharmaceutical and Drug Industries Research Division, National Research Centre, Cairo, Egypt
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11
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Zhuang J, Kumar S, Rustum A. Development and Validation of a Normal Phase Chiral HPLC Method for Analysis of Afoxolaner Using a Chiralpak ®AD-3 Column. J Chromatogr Sci 2016; 54:1813-1819. [DOI: 10.1093/chromsci/bmw162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 08/02/2016] [Accepted: 09/12/2016] [Indexed: 11/12/2022]
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12
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Gao B, Zhang Q, Tian M, Zhang Z, Wang M. Enantioselective determination of the chiral pesticide isofenphos-methyl in vegetables, fruits, and soil and its enantioselective degradation in pak choi using HPLC with UV detection. Anal Bioanal Chem 2016; 408:6719-27. [DOI: 10.1007/s00216-016-9790-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 06/27/2016] [Accepted: 07/12/2016] [Indexed: 10/21/2022]
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13
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Hu W, Xie W, Chen S, Zhang N, Zou Y, Dong X, Rashid M, Xiao Y, Hu M, Zhong G. Separation of Cis- and Trans-Cypermethrin by Reversed-Phase High-Performance Liquid Chromatography. J Chromatogr Sci 2014; 53:612-8. [DOI: 10.1093/chromsci/bmu094] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Yang X, Su L, Hou X, Ding S, Xu W, Wang B, Fang H. High-performance liquid chromatographic enantioseparation of 3,5-disubstituted hydantoins analogs and temperature-induced reversals of elution orders on a polysaccharide-based chiral stationary phase. J Chromatogr A 2014; 1355:291-5. [DOI: 10.1016/j.chroma.2014.06.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 06/04/2014] [Accepted: 06/06/2014] [Indexed: 10/25/2022]
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15
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Chen XJ, Zhao M, Shen J, De Shen X, Ke XJ, Cai JC. COMPARATIVE STUDIES OF ENANTIOSEPARATION OF SOME AMINO ACIDS AND N-PROTECTED AMINO ACIDS IN NORMAL PHASE HPLC AND ANALYSIS OF UNUSUAL PEAK SHAPE. J LIQ CHROMATOGR R T 2013. [DOI: 10.1080/10826076.2012.745148] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Xing Juan Chen
- a Polymer Materials Research Center, College of Material Science and Chemical Engineering , Harbin Engineering University , Harbin , China
| | - Min Zhao
- a Polymer Materials Research Center, College of Material Science and Chemical Engineering , Harbin Engineering University , Harbin , China
| | - Jun Shen
- a Polymer Materials Research Center, College of Material Science and Chemical Engineering , Harbin Engineering University , Harbin , China
| | - Xian De Shen
- a Polymer Materials Research Center, College of Material Science and Chemical Engineering , Harbin Engineering University , Harbin , China
| | - Xian Jun Ke
- a Polymer Materials Research Center, College of Material Science and Chemical Engineering , Harbin Engineering University , Harbin , China
| | - Jian Chong Cai
- a Polymer Materials Research Center, College of Material Science and Chemical Engineering , Harbin Engineering University , Harbin , China
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16
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Sardella R, Ianni F, Lisanti A, Marinozzi M, Scorzoni S, Natalini B. The effect of mobile phase composition in the enantioseparation of pharmaceutically relevant compounds with polysaccharide-based stationary phases. Biomed Chromatogr 2013; 28:159-67. [DOI: 10.1002/bmc.3015] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 07/08/2013] [Accepted: 07/08/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Roccaldo Sardella
- Dipartimento di Chimica e Tecnologia del Farmaco; Via del Liceo 1 06123 Perugia Italy
| | - Federica Ianni
- Dipartimento di Chimica e Tecnologia del Farmaco; Via del Liceo 1 06123 Perugia Italy
| | - Antonella Lisanti
- Dipartimento di Chimica e Tecnologia del Farmaco; Via del Liceo 1 06123 Perugia Italy
| | - Maura Marinozzi
- Dipartimento di Chimica e Tecnologia del Farmaco; Via del Liceo 1 06123 Perugia Italy
| | - Stefania Scorzoni
- Dipartimento di Chimica e Tecnologia del Farmaco; Via del Liceo 1 06123 Perugia Italy
| | - Benedetto Natalini
- Dipartimento di Chimica e Tecnologia del Farmaco; Via del Liceo 1 06123 Perugia Italy
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Vanthuyne N, Roussel C. Chiroptical Detectors for the Study of Unusual Phenomena in Chiral Chromatography. Top Curr Chem (Cham) 2013; 340:107-51. [DOI: 10.1007/128_2013_441] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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18
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Wang Q, Xiong Y, Lu B, Fan J, Zhang S, Zheng S, Zhang W. Reversal of elution order of N
-(2,4-dinitrophenyl)-proline and N
-(2,4-dinitrophenyl)-serine in HPLC by BSA chiral stationary phase. J Sep Sci 2013; 36:1343-8. [DOI: 10.1002/jssc.201201165] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 01/23/2013] [Accepted: 01/24/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Qiuyun Wang
- Institute of Special Materials; School of Chemistry and Environment; South China Normal University; Guangzhou P. R. China
| | - Yajin Xiong
- Institute of Special Materials; School of Chemistry and Environment; South China Normal University; Guangzhou P. R. China
| | - Baozhu Lu
- Guangzhou Research and Creativity Biotechnology Ltd.; Guangzhou P. R. China
| | - Jun Fan
- Institute of Special Materials; School of Chemistry and Environment; South China Normal University; Guangzhou P. R. China
| | - Sheng Zhang
- Department of Chemistry; National University of Singapore; Singapore
| | - Shengrun Zheng
- Institute of Special Materials; School of Chemistry and Environment; South China Normal University; Guangzhou P. R. China
| | - Weiguang Zhang
- Institute of Special Materials; School of Chemistry and Environment; South China Normal University; Guangzhou P. R. China
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West C, Cieslikiewicz-Bouet M, Lewinski K, Gillaizeau I. Enantiomeric Separation of Original Heterocyclic Organophosphorus Compounds in Supercritical Fluid Chromatography. Chirality 2013; 25:230-7. [DOI: 10.1002/chir.22133] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 10/15/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Caroline West
- Institut de Chimie Organique et Analytique (ICOA); Université d'Orléans, UMR CNRS 7311; B.P. 6759, rue de Chartres 45067 Orléans Cedex 2 France
| | - Monika Cieslikiewicz-Bouet
- Institut de Chimie Organique et Analytique (ICOA); Université d'Orléans, UMR CNRS 7311; B.P. 6759, rue de Chartres 45067 Orléans Cedex 2 France
- Department of Organic Chemistry; Jagiellonian University; R. Ingardena 3 30060 Krakow Poland
| | - Krzysztof Lewinski
- Department of Organic Chemistry; Jagiellonian University; R. Ingardena 3 30060 Krakow Poland
| | - Isabelle Gillaizeau
- Institut de Chimie Organique et Analytique (ICOA); Université d'Orléans, UMR CNRS 7311; B.P. 6759, rue de Chartres 45067 Orléans Cedex 2 France
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L(+) and D(-) lactate are increased in plasma and urine samples of type 2 diabetes as measured by a simultaneous quantification of L(+) and D(-) lactate by reversed-phase liquid chromatography tandem mass spectrometry. EXPERIMENTAL DIABETES RESEARCH 2012; 2012:234812. [PMID: 22474418 PMCID: PMC3310144 DOI: 10.1155/2012/234812] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2011] [Revised: 11/08/2011] [Accepted: 11/09/2011] [Indexed: 12/22/2022]
Abstract
BACKGROUND Plasma and urinary levels of D-lactate have been linked to the presence of diabetes. Previously developed techniques have shown several limitations to further evaluate D-lactate as a biomarker for this condition. METHODS D- and L-lactate were quantified using ultraperformance liquid chromatography tandem mass spectrometry with labelled internal standard. Samples were derivatized with diacetyl-L-tartaric anhydride and separated on a C(18)-reversed phase column. D- and L-lactate were analysed in plasma and urine of controls, patients with inflammatory bowel disease (IBD), and patients with type 2 diabetes (T2DM). RESULTS Quantitative analysis of D- and L-lactate was achieved successfully. Calibration curves were linear (r(2) > 0.99) over the physiological and pathophysiological ranges. Recoveries for urine and plasma were between 96% and 113%. Inter- and intra-assay variations were between 2% and 9%. The limits of detection of D-lactate and L-lactate in plasma were 0.7 μmol/L and 0.2 μmol/L, respectively. The limits of detection of D-lactate and L-lactate in urine were 8.1 nmol/mmol creatinine and 4.4 nmol/mmol creatinine, respectively. Plasma and urinary levels of D- and L-lactate were increased in patients with IBD and T2DM as compared with controls. CONCLUSION The presented method proved to be suitable for the quantification of D- and L-lactate and opens the possibility to explore the use of D-lactate as a biomarker.
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21
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Xiang C, Liu G, Kang S, Guo X, Yao B, Weng W, Zeng Q. Unusual chromatographic enantioseparation behavior of naproxen on an immobilized polysaccharide-based chiral stationary phase. J Chromatogr A 2011; 1218:8718-21. [DOI: 10.1016/j.chroma.2011.10.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2011] [Revised: 10/04/2011] [Accepted: 10/07/2011] [Indexed: 10/16/2022]
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22
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Hamman C, Schmidt DE, Wong M, Hayes M. The use of ammonium hydroxide as an additive in supercritical fluid chromatography for achiral and chiral separations and purifications of small, basic medicinal molecules. J Chromatogr A 2011; 1218:7886-94. [DOI: 10.1016/j.chroma.2011.08.064] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 08/17/2011] [Accepted: 08/19/2011] [Indexed: 11/16/2022]
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23
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Chankvetadze L, Ghibradze N, Karchkhadze M, Peng L, Farkas T, Chankvetadze B. Enantiomer elution order reversal of fluorenylmethoxycarbonyl-isoleucine in high-performance liquid chromatography by changing the mobile phase temperature and composition. J Chromatogr A 2011; 1218:6554-60. [DOI: 10.1016/j.chroma.2011.06.068] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Revised: 06/15/2011] [Accepted: 06/16/2011] [Indexed: 10/18/2022]
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24
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Reversal of Elution Order between Enantiomers of Binaphthol on an Immobilized Polysaccharide-Based Chiral Stationary Phase. Chromatographia 2011. [DOI: 10.1007/s10337-011-2104-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Dossou KSS, Edorh PA, Chiap P, Chankvetadze B, Servais AC, Fillet M, Crommen J. Determination of enantiomeric purity of S-amlodipine by chiral LC with emphasis on reversal of enantiomer elution order. J Sep Sci 2011; 34:1772-80. [DOI: 10.1002/jssc.201100339] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 05/06/2011] [Accepted: 05/08/2011] [Indexed: 11/09/2022]
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26
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Direct chiral liquid chromatography determination of aryloxyphenoxypropionic herbicides in soil: deconvolution tools for peak processing. Anal Bioanal Chem 2011; 400:3547-60. [DOI: 10.1007/s00216-011-4969-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 03/23/2011] [Accepted: 03/28/2011] [Indexed: 10/18/2022]
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27
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Tobis J, Boch L, Thomann Y, Tiller JC. Amphiphilic polymer conetworks as chiral separation membranes. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.02.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Zhang YJ, Zhang YP, Duan QR, Bai LY, Chen J, Zhou XM. ENANTIOSEPARATION USING A CELLULOSE-BASED STATIONARY PHASE BY CAPILLARY LIQUID CHROMATOGRAPHY. J LIQ CHROMATOGR R T 2010. [DOI: 10.1080/10826076.2010.526823] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Yi-Jun Zhang
- a Henan Institute of Science and Technology , Xinxiang, P. R. China
| | - Yu-Ping Zhang
- a Henan Institute of Science and Technology , Xinxiang, P. R. China
| | - Qi-Rong Duan
- a Henan Institute of Science and Technology , Xinxiang, P. R. China
| | - Lian-Yang Bai
- b Pesticide Research Institute, Hunan Agricultural University , Changsha, P. R. China
| | - Jun Chen
- a Henan Institute of Science and Technology , Xinxiang, P. R. China
- b Pesticide Research Institute, Hunan Agricultural University , Changsha, P. R. China
| | - Xiao-Mao Zhou
- b Pesticide Research Institute, Hunan Agricultural University , Changsha, P. R. China
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29
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Lao W, Gan J. Characterization of warfarin unusual peak profiles on oligoproline chiral high performance liquid chromatography columns. J Chromatogr A 2010; 1217:6545-54. [DOI: 10.1016/j.chroma.2010.08.066] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2010] [Revised: 06/25/2010] [Accepted: 08/24/2010] [Indexed: 11/29/2022]
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30
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Zhan F, Yu G, Yao B, Guo X, Liang T, Yu M, Zeng Q, Weng W. Solvent effect in the chromatographic enantioseparation of 1,1′-bi-2-naphthol on a polysaccharide-based chiral stationary phase. J Chromatogr A 2010; 1217:4278-84. [DOI: 10.1016/j.chroma.2010.04.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Revised: 04/03/2010] [Accepted: 04/09/2010] [Indexed: 11/25/2022]
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31
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Zhang X, Xia T, Chen J, Huang L, Cai X. Direct chiral resolution of metalaxyl and metabolite metalaxyl acid in aged mobile phases: the role of trace water. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:5004-5010. [PMID: 20302379 DOI: 10.1021/jf9044342] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The separation of chiral transformation products greatly complements the understanding of the stereochemistry of chiral pollutants. In this study, direct enantiomeric resolution of metalaxyl and its main degradation product metalaxyl acid, often co-occurring in the environment, was carried out in normal-phase high-performance liquid chromatography with a Chiralcel OJ-H column. (R)-Metalaxyl acid and (S)-metalaxyl, which were almost parallel bonding to the chiral stationary phase, tended to separate, started to overlap, coeluted, and separated again with subtle changes of the mobile phase consisting of n-hexane, 2-propanol, acetic acid, and trace water. Their competition above hampered an acceptable direct separation in fresh mobile phases. Aged mobile phases with a storage period of 3-5 days, however, significantly improved their separation, in which trace water from moisture air diffusion was found to play a major role. Trace water differentially affected peak width and retention times and then induced enhanced peak separation, confirmed by deliberate addition of water to fresh mobile phases. Furthermore, none of the studied factors, involving temperature, concomitant analytes, and trace water, could cause changes of the configuration of the chiral stationary phase. Simultaneous enantiomeric separation of both compounds was achieved in aged or fresh mobile phases with adventitious or added water and gave satisfactory peak separation, all with Rs values of more than 1.20 in environmental samples.
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Affiliation(s)
- Xiaoxiang Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
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32
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Al-Badr AA. Omeprazole. PROFILES OF DRUG SUBSTANCES, EXCIPIENTS, AND RELATED METHODOLOGY 2010; 35:151-262. [PMID: 22469222 DOI: 10.1016/s1871-5125(10)35004-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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33
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Lämmerhofer M, Pell R, Mahut M, Richter M, Schiesel S, Zettl H, Dittrich M, Schubert-Zsilavecz M, Lindner W. Enantiomer separation and indirect chromatographic absolute configuration prediction of chiral pirinixic acid derivatives: Limitations of polysaccharide-type chiral stationary phases in comparison to chiral anion-exchangers. J Chromatogr A 2010; 1217:1033-40. [DOI: 10.1016/j.chroma.2009.10.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2009] [Revised: 10/13/2009] [Accepted: 10/14/2009] [Indexed: 10/20/2022]
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34
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Morante-Zarcero S, del Hierro I, Fajardo M, Sierra I. HPLC with polysaccharide chiral stationary phase in polar-organic phase mode: Application to the asymmetric epoxidation of allylic alcohols. J Sep Sci 2009; 32:3055-63. [DOI: 10.1002/jssc.200900170] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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35
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Wang S, Cann NM. A molecular dynamics study of chirality transfer from chiral surfaces to nearby solvent. J Chem Phys 2009; 130:244701. [DOI: 10.1063/1.3152332] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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36
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Ates H, Mangelings D, Vander Heyden Y. Fast generic chiral separation strategies using electrophoretic and liquid chromatographic techniques. J Pharm Biomed Anal 2008; 48:288-94. [DOI: 10.1016/j.jpba.2007.12.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2007] [Accepted: 12/09/2007] [Indexed: 11/29/2022]
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37
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Morante-Zarcero S, del Hierro I, Fajardo M, Sierra I. Development and validation of a chiral HPLC method for rapid screening of allylic alcohol asymmetric epoxidation processes. Anal Chim Acta 2008; 618:102-9. [DOI: 10.1016/j.aca.2008.04.034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2008] [Revised: 03/26/2008] [Accepted: 04/15/2008] [Indexed: 11/28/2022]
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38
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Zhang T, Nguyen D, Franco P. Enantiomer resolution screening strategy using multiple immobilised polysaccharide-based chiral stationary phases. J Chromatogr A 2008; 1191:214-22. [DOI: 10.1016/j.chroma.2007.12.026] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2007] [Revised: 12/06/2007] [Accepted: 12/10/2007] [Indexed: 10/22/2022]
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39
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Yoon TH, Lee E, Kim JM, Kim WS, Kim IH. The enrichment of loxoprofen enantiomer by 6-columns simulated moving bed chromatography. KOREAN J CHEM ENG 2008. [DOI: 10.1007/s11814-008-0050-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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40
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Park JS, Kim WS, Kim JM, Kim IH. Ibuprofen Racemate Separation by Simulated Moving Bed. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2008. [DOI: 10.1252/jcej.07we102] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Joon Sup Park
- Department of Chemical Engineering, Chungnam National University
| | - Woo-Sik Kim
- School of Environmental and Chemical Engineering, Kyunghee University
| | - Jong Min Kim
- Department of Chemical Engineering, Dong A University
| | - In-Ho Kim
- Department of Chemical Engineering, Chungnam National University
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41
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Hintermann L. Peak Separation by Adventitious or Added Water in Normal-Phase Chiral HPLC. J Org Chem 2007; 72:9790-3. [DOI: 10.1021/jo7019256] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lukas Hintermann
- Institut für Organische Chemie, RWTH Aachen, Landoltweg 1, D-52074 Aachen, Germany
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42
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Franco EJ, Hofstetter H, Hofstetter O. Enantiomer separation of alpha-hydroxy acids in high-performance immunoaffinity chromatography. J Pharm Biomed Anal 2007; 46:907-13. [PMID: 18022339 DOI: 10.1016/j.jpba.2007.10.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Accepted: 10/05/2007] [Indexed: 10/22/2022]
Abstract
In this study, a monoclonal anti-d-hydroxy acid antibody was immobilized onto a synthetic high-flow-through chromatographic support material to produce a chiral stationary phase suitable for enantiomer separation of free alpha-hydroxy acids. Chiral separation of several aliphatic and aromatic members of this class of compounds was achieved in HPLC under mild isocratic buffer conditions using phosphate buffered saline, pH 7.4, as mobile phase. Due to the high degree of stereoselectivity exhibited by the immobilized antibody, in all cases the l-enantiomer eluted with the void volume, while the d-enantiomer was retained and eluted second. The effect of the mobile phase parameters flow rate, temperature, pH, and ionic strength on the enantiomer separation of the model analyte mandelic acid was investigated. While it was found that variations in the flow rate did not change the retention factor k2, dramatic effects on the interaction between the immobilized antibody and d-mandelic acid were observed when any of the other mobile phase parameters were modulated.
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Affiliation(s)
- Elliott J Franco
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115-2862, USA
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43
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Teutenberg T, Tuerk J, Holzhauser M, Giegold S. Temperature stability of reversed phase and normal phase stationary phases under aqueous conditions. J Sep Sci 2007; 30:1101-14. [PMID: 17595945 DOI: 10.1002/jssc.200600507] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this study the temperature stability of several normal phase and RP columns was investigated using a water-only mobile phase. The temperature was adjusted to 120 degrees C for the bare silica stationary phases and to 185 degrees C for the metal oxide and carbon stationary phases. It could be shown that metal oxide stationary phases exhibited excellent thermal stability over the duration of the test period and are therefore suitable for high temperature LC applications.
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44
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Ghanem A. Exploring solvent versatility in immobilized cellulose-based chiral stationary phase for the enantioselective liquid chromatographic resolution of racemates. J Sep Sci 2007; 30:1019-28. [PMID: 17566336 DOI: 10.1002/jssc.200600357] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Chiralpak IB, a new chiral stationary phase (CSP) containing cellulose tris(3,5-dimethylphenylcarabamate) immobilized onto silica gel, is investigated for the direct enantioselective separation of a set of racemic N-alkylated barbiturates and analogs of thalidomide alkylated in position 3 of the piperidin-2,6-dione ring using different nonstandard solvents such as dichloromethane (DCM), ethyl acetate, THF, methyl tert-butyl ether as an eluent and diluent, respectively, in HPLC. The separation, resolution, and elution order of the investigated compounds were compared on both immobilized and coated cellulose tris(3,5-dimethylphenylcarbamate) CSPs (Chiralpak IB and Chiralcel OD, respectively) using a mixture of n-hexane/2-propanol (90:10 v/v) as mobile phase with different flow-rates and fixed UV detection at 254 nm. The effect of the immobilization of the cellulose tris-(3,5-dimethylphenylcarbamate) CSP on silica (Chiralpak IB) on the chiral recognition ability was noted as the coated phase (Chiralcel OD) possesses a higher resolving power in some cases than the immobilized one (Chiralpak IB). However, a few racemates, which were not or poorly resolved on the immobilized Chiralpak IB or the coated Chiralcel OD when using standard solvents were most efficiently resolved on the immobilized Chiralpak IB upon using nonstandard solvents. Furthermore, the immobilized phase withstands the nonstandard (prohibited) HPLC solvents mentioned previously when used as eluents or as a dissolving agent for the analyte itself. An example of inversion or apparent inversion of elution order on Chiralpak IB is reported. The direct analysis of a spiked plasma sample extracted using DCM on Chiralpak IB is also shown.
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Affiliation(s)
- Ashraf Ghanem
- Biomedicinal Chemistry Unit, Biological and Medical Research Department, King Faisal Specialist Hospital and Research Centre, (MBC-03-95), Riyadh, Saudi Arabia.
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45
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Ghanem A. True and false reversal of the elution order of barbiturates on a bonded cellulose-based chiral stationary phase. J Chromatogr A 2006; 1132:329-32. [DOI: 10.1016/j.chroma.2006.09.043] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2006] [Revised: 09/11/2006] [Accepted: 09/19/2006] [Indexed: 11/25/2022]
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46
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Lao W, Gan J. Responses of enantioselective characteristics of imidazolinone herbicides and Chiralcel OJ column to temperature variations. J Chromatogr A 2006; 1131:74-84. [PMID: 16919283 DOI: 10.1016/j.chroma.2006.07.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2006] [Revised: 06/26/2006] [Accepted: 07/10/2006] [Indexed: 12/01/2022]
Abstract
Temperature affects not only the chromatographic characteristics of solute but may also alter the conformation of the stationary phase. However, temperature influences on enantioseparation of solute and conformation of chiral stationary phase (CSP) are seldom considered simultaneously. In this study, three temperature programs, a conventional heating procedure, a cyclic van't Hoff program, and a step-temperature program, were employed to evaluate temperature effects on enantioseparation of five imidazolinone herbicides on Chiralcel OJ column and the conformational state of the stationary phase. The van't Hoff plots of retention factor (k'), distribution constant (K) and separation factor (alpha) for imazapyr (1), imazapic (2), imazethapyr (3), and imazamox (4) were linear within 15-50 degrees C. Nonlinear van't Hoff plots of alpha were observed for imazaquin (5) with mobile phase of n-hexane (0.1% TFA)-2-propanol at 70/30 or 60/40 (v/v). The large molecular size of imazaquin (5) and van't Hoff plots of alpha were therefore more sensitive at detecting conformational changes of the stationary phase. Small but irreversible conformational changes occurred at 5-10 degrees C with the solvent ratio of 60/40. During the cyclic van't Hoff program, reversible conformational changes were observed at >or=15 degrees C. A switch was even visible at about 25 degrees C with the solvent ratio of 60/40 during the re-cooling cycle. The cyclic van't Hoff temperature program showed that using OJ column may yield satisfactory results at 15-50 degrees C but not at <or=15 degrees C. The step-temperature program showed that fast temperature changes over the 5-50 degrees C range may be performed on the coated OJ phase, and the recovery of enantioselectivity was relatively fast. This study shows that simultaneous evaluation of temperature effects on the chromatographic behavior of a chiral analyte and the conformational state of the chiral stationary phase provides more insights for understanding mechanisms of enantioseparation and selecting optimal separation conditions.
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Affiliation(s)
- Wenjian Lao
- Department of Environmental Sciences, University of California, Riverside, 92521, USA
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47
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Ming Y, Zhao L, Zhang H, Shi Y, Li Y. Investigation of Enantiomer Separation by LC with a New Bonded Cellulose 3,5-Dimethylphenylcarbamate Chiral Stationary Phase. Chromatographia 2006. [DOI: 10.1365/s10337-006-0018-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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48
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Yang G, Parrilla Vazquez P, Garrido Frenich A, Martinez Vidal JL, Aboul‐Enein HY. Enantioseparation of Organophosphonate Derivatives on Amylose Tris(3,5‐Dimethylphenylcarbamate) Chiral Stationary Phase by HPLC. J LIQ CHROMATOGR R T 2006. [DOI: 10.1081/jlc-120025424] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Guo‐Sheng Yang
- a Department of Chemistry , Shandong University , Jinan, P. R. China
- b Department of Analytical Chemistry , University of Almeria , La Canada de San Urbano, Almeria, Spain
| | - Piedad Parrilla Vazquez
- b Department of Analytical Chemistry , University of Almeria , La Canada de San Urbano, Almeria, Spain
| | - Antonia Garrido Frenich
- b Department of Analytical Chemistry , University of Almeria , La Canada de San Urbano, Almeria, Spain
| | - Jose L. Martinez Vidal
- b Department of Analytical Chemistry , University of Almeria , La Canada de San Urbano, Almeria, Spain
| | - Hassan Y. Aboul‐Enein
- c Pharmaceutical Analysis Laboratory, Biological and Medical Research Department (MBC‐03‐65) , King Faisal Specialist Hospital and Research Centre , P.O. Box 3354, Riyadh, 11211, Saudi Arabia
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49
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Cass QB, Degani ALG, Cassiano NM. Effects on Enantioselectivity by the Use of Polysaccharide‐Based Columns by Multimodal Elution. J LIQ CHROMATOGR R T 2006. [DOI: 10.1081/jlc-120022395] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Quezia B. Cass
- a Departmento de Química , Universidade Federal de São Carlos , CP 676, São Carlos , SP , 13565‐905 , Brazil
| | - Ana Luiza G. Degani
- a Departmento de Química , Universidade Federal de São Carlos , CP 676, São Carlos , SP , 13565‐905 , Brazil
| | - Neila M. Cassiano
- a Departmento de Química , Universidade Federal de São Carlos , CP 676, São Carlos , SP , 13565‐905 , Brazil
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50
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Sellers JA, Olsen BA, Owens PK, Gavin PF. Determination of the enantiomer and positional isomer impurities in atomoxetine hydrochloride with liquid chromatography using polysaccharide chiral stationary phases. J Pharm Biomed Anal 2006; 41:1088-94. [PMID: 16533585 DOI: 10.1016/j.jpba.2006.01.063] [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] [Received: 12/02/2005] [Revised: 01/25/2006] [Accepted: 01/27/2006] [Indexed: 11/20/2022]
Abstract
A normal-phase isocratic chiral liquid chromatographic method has been developed and validated for atomoxetine hydrochloride. In addition to the S-enantiomer of atomoxetine, the conditions separate both para and meta positional isomers and the phenyl des-methyl analog. Method development strategies included (a) evaluation of polysaccharide-based chiral stationary phases with nonaqueous mobile phases, (b) the use of an octyl stationary phase with a sulfated-beta-cyclodextrin mobile phase additive, and (c) capillary electrophoresis using a single isomer heptakis-6-sulfato-beta-cyclodextrin modifier. All three approaches yielded acceptable conditions for the separation of atomoxetine from related molecules with the former fully validated and the latter two held as alternatives if needed. The final method conditions employing a Chiralcel OD-H column and mobile phase of hexane/IPA/DEA/TFA (85/15/0.15/0.2, v/v/v/v) at 1.0 mL/min have been fully validated with acceptable specificity, linearity, accuracy, repeatability, intermediate precision and quantitation limit.
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Affiliation(s)
- Jane A Sellers
- Analytical Sciences Research & Development, Eli Lilly & Company, Lilly Corporate Center, Indianapolis, IN 46285, USA
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