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Du X, Yan Y, Dai Y, Xu R. Yogurt Alleviates Cyclophosphamide-Induced Immunosuppression in Mice through D-Lactate. Nutrients 2024; 16:1395. [PMID: 38732641 PMCID: PMC11085661 DOI: 10.3390/nu16091395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 04/29/2024] [Accepted: 05/01/2024] [Indexed: 05/13/2024] Open
Abstract
Numerous studies have investigated the immunomodulatory effects of yogurt, but the underlying mechanism remained elusive. This study aimed to elucidate the alleviating properties of yogurt on immunosuppression and proposed the underlying mechanism was related to the metabolite D-lactate. In the healthy mice, we validated the safety of daily yogurt consumption (600 μL) or D-lactate (300 mg/kg). In immunosuppressed mice induced by cyclophosphamide (CTX), we evaluated the immune regulation of yogurt and D-lactate. The result showed that yogurt restored body weight, boosted immune organ index, repaired splenic tissue, recovered the severity of delayed-type hypersensitivity reactions and increased serum cytokines (IgA, IgG, IL-6, IFN-γ). Additionally, yogurt enhanced intestinal immune function by restoring the intestinal barrier and upregulating the abundance of Bifidobacterium and Lactobacillus. Further studies showed that D-lactate alleviated immunosuppression in mice mainly by promoting cellular immunity. D-lactate recovered body weight and organ development, elevated serum cytokines (IgA, IgG, IL-6, IFN-γ), enhanced splenic lymphocyte proliferation and increased the mRNA level of T-bet in splenic lymphocyte to bolster Th1 differentiation. Finally, CTX is a chemotherapeutic drug, thus, the application of yogurt and D-lactate in the tumor-bearing mouse model was initially explored. The results showed that both yogurt (600 μL) and D-lactate (300 mg/kg) reduced cyclophosphamide-induced immunosuppression without promoting tumor growth. Overall, this study evaluated the safety, immune efficacy and applicability of yogurt and D-lactate in regulating immunosuppression. It emphasized the potential of yogurt as a functional food for immune regulation, with D-lactate playing a crucial role in its immunomodulatory effects.
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Affiliation(s)
- Xinru Du
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi 214122, China;
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Yongheng Yan
- School of Public Health, Shandong First Medical University, Jinan 271016, China
| | - Yufeng Dai
- State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi 214122, China;
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Ruijie Xu
- Global Health Institute, School of Public Health, Xi’an Jiaotong University, Xi’an 710061, China;
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2
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D'Orazio G, Fanali C, Gentili A, Tagliaro F, Fanali S. Nano-liquid chromatography for enantiomers separation of baclofen by using vancomycin silica stationary phase. J Chromatogr A 2019; 1605:360358. [PMID: 31337499 DOI: 10.1016/j.chroma.2019.07.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 07/03/2019] [Accepted: 07/06/2019] [Indexed: 01/06/2023]
Abstract
The chiral separation of baclofen (Bac) was obtained by nano-liquid chromatography tandem mass spectrometry (nano-LC-MS/MS) using a 100 μm I.D. fused silica capillary column packed with silica particles chemically modified with vancomycin. Various experimental parameters, such as composition (buffer concentration, water content, organic modifier) and pH of the mobile phase and sample solvent were investigated for method optimization. In order to increase the sensitivity an on-column focusing procedure was applied. Acceptable separation of Bac enantiomers was obtained in less than 11 min eluting in isocratic mode, with 90:10 MeOH/water (v/v) containing 10 mM ammonium acetate at pH 4.5. These optimized experimental conditions were applied to the analysis of human plasma samples spiked with racemic mixture of Bac. The use of a Buckypaper disc as sorbent membrane allows one to recover both enantiomers with yields ≥ 65%. The method was fully validated, following the identification criteria of the European Commission Decision 2002/657/EC.
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Affiliation(s)
- Giovanni D'Orazio
- Istituto per i Sistemi Biologici (ISB), CNR-Consiglio Nazionale delle Ricerche, Monterotondo, Rome, Italy
| | - Chiara Fanali
- Department of Medicine, University Campus Bio-Medico of Rome, Rome, Italy
| | | | - Franco Tagliaro
- Unit of Forensic Medicine, Department of Diagnostics and Public Health, University of Verona, Verona, Italy; Pharmacokinetics and Metabolomics Laboratory of the I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | - Salvatore Fanali
- Teaching Committee of Ph.D. School in Natural Science and Engineering, University of Verona, Verona, Italy.
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Ali I, Suhail M, Alothman ZA, Alwarthan A. Chiral separation and modeling of baclofen, bupropion, and etodolac profens on amylose reversed phase chiral column. Chirality 2017; 29:386-397. [DOI: 10.1002/chir.22717] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 04/29/2017] [Accepted: 05/05/2017] [Indexed: 12/27/2022]
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
| | - Zeid A. Alothman
- Department of Chemistry, College of Science; King Saud University; Riyadh Kingdom of Saudi Arabia
| | - Abdulrahman Alwarthan
- Department of Chemistry, College of Science; King Saud University; Riyadh Kingdom of Saudi Arabia
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Batra S, Bhushan R. Enantioresolution of (RS)-baclofen by liquid chromatography: A review. Biomed Chromatogr 2016; 31. [DOI: 10.1002/bmc.3833] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Accepted: 08/30/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Sonika Batra
- Department of Basic and Applied Sciences; GD Goenka University; Gurgaon India
| | - Ravi Bhushan
- Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee India
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Labat L, Goncalves A, Cleophax C, Megarbane B, Decleves X. Dosage du baclofène dans le plasma en chromatographie phase liquide couplée à de la spectrométrie de masse en tandem : à propos d’un cas de surdosage. TOXICOLOGIE ANALYTIQUE ET CLINIQUE 2016. [DOI: 10.1016/j.toxac.2016.04.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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6
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Singh M, Malik P, Bhushan R. Resolution of Enantiomers of (RS)-Baclofen by Ligand-Exchange Thin-Layer Chromatography. J Chromatogr Sci 2016; 54:842-6. [PMID: 26896346 DOI: 10.1093/chromsci/bmw014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Indexed: 11/14/2022]
Abstract
A new chromatographic method has been developed for direct enantioresolution of (RS)-baclofen by ligand-exchange thin-layer chromatography (TLC) adopting two different approaches; (A) TLC plates were prepared by mixing the ligand exchange reagents (LER) with silica gel slurry and the chromatograms were developed with different achiral solvents or solvents having no chiral additive, and (B) the LER consisting of Cu(II)-L-amino acid complex was used as chiral mobile phase additive and the plain plates of silica gel having no chiral selector were used. Cu(II) acetate and four L-amino acids (namely, L-tryptophan, L-histidine, L-proline and L-phenylalanine) were used for the preparation of LERs. Spots were located by the use of iodine vapor. Effect of temperature and the mole ratio of Cu(II)-to-amino acid on enantioresolution were also studied. The results for the two methods have been compared, and the issue of involvement of the Cu(II) cation for the best performance of the two methods has been discussed with respect to the same mobile phase. L-Trp proved to be a good ligand using a common mobile phase in each case.
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Affiliation(s)
- Manisha Singh
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Poonam Malik
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
| | - Ravi Bhushan
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India
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7
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Batra S, Bhushan R. Synthesis of three strong UV-absorbing Naproxen-based chiral derivatizing agents and their application for enantioseparation of Baclofen by RP-HPLC. ACTA CHROMATOGR 2015. [DOI: 10.1556/achrom.27.2015.2.5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Ali I, Alam SD, Al-Othman ZA, Farooqi JA. Recent Advances in SPE-Chiral-HPLC Methods for Enantiomeric Separation of Chiral Drugs in Biological Samples. J Chromatogr Sci 2013; 51:645-54. [DOI: 10.1093/chromsci/bms262] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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9
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Bhushan R, Dixit S. HPLC enantioresolution of (R,S)-baclofen using three newly synthesized dichloro-s-triazine reagents having amines and five others having amino acids as chiral auxiliaries. Biomed Chromatogr 2011; 26:743-8. [DOI: 10.1002/bmc.1723] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Accepted: 09/05/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Ravi Bhushan
- Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee; 247667; India
| | - Shuchi Dixit
- Department of Chemistry; Indian Institute of Technology Roorkee; Roorkee; 247667; India
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Bhushan R, Dixit S. Microwave-assisted synthesis and reversed-phase high-performance liquid chromatographic separation of diastereomers of (R,S)-baclofen using ten chiral derivatizing reagents designed from trichloro-s-triazine. J Chromatogr A 2010; 1217:6382-7. [PMID: 20817188 DOI: 10.1016/j.chroma.2010.08.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2010] [Revised: 07/30/2010] [Accepted: 08/06/2010] [Indexed: 10/19/2022]
Abstract
Four dichloro-s-triazine (DCT) and five monochloro-s-triazine (MCT) chiral derivatizing reagents (CDRs) were synthesized by incorporating amino acid amide moieties as chiral auxiliaries in trichloro-s-triazine and its 6-methoxy derivative, respectively. Another MCT reagent was synthesized by substitution of two chlorine atoms with two different amino acid amides in trichloro-s-triazine. These reagents were used for synthesis of diastereomers of (R,S)-baclofen under microwave irradiation (i.e. 60 s at 85% power using DCT reagents and 90 s at 85% power using MCT reagents). The diastereomers were separated on a reversed-phase C18 column using mixtures of methanol with aqueous trifluoroacetic acid (TFA) with UV detection at 230 nm. The separation behavior in terms of retention times and resolutions obtained for the two sets of diastereomers prepared with DCT and MCT reagents were compared among themselves and among the two groups. Longer retention times and better resolutions were observed with DCT reagents as compared to MCT reagents. The calibration curves were linear for both (R)- and (S)-baclofen in the concentration range 50-500 μg/ml. The average regression was 0.999 for both (R)- and (S)-baclofen. The RSD for (R)-baclofen was 0.40-0.86% for intra-day precision and 0.60-1.40% for inter-day precision and these values for (S)-baclofen were 0.52-0.75% and 0.64-1.32%, respectively. The recovery was 97.2-98.9% for (R)- and 97.0-98.9% for (S)-baclofen. The limit of detection was 1.63 ng/ml and 1.52 ng/ml for (R)- and (S)-baclofen, respectively.
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Affiliation(s)
- Ravi Bhushan
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India.
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11
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Suntornsuk L, Ployngam S. Simultaneous determination of R-(−)-, S-(+)-baclofen and impurity A by electrokinetic chromatography. J Pharm Biomed Anal 2010; 51:541-8. [DOI: 10.1016/j.jpba.2009.09.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2009] [Revised: 09/04/2009] [Accepted: 09/05/2009] [Indexed: 10/20/2022]
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12
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Ban E, Park J, Kim C. Semi‐Microbore HPLC for the Determination of Baclofen in Human Plasma Using Column Switching. J LIQ CHROMATOGR R T 2009. [DOI: 10.1081/jlc-200032681] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Eunmi Ban
- a National Research Lab for Drug and Gene Delivery, College of Pharmacy , Seoul National University , San 56‐1, Shillim‐Dong, Kwanak‐Gu, Seoul , 151‐742 , Korea
| | - Jeong‐Sook Park
- a National Research Lab for Drug and Gene Delivery, College of Pharmacy , Seoul National University , San 56‐1, Shillim‐Dong, Kwanak‐Gu, Seoul , 151‐742 , Korea
| | - Chong‐Kook Kim
- a National Research Lab for Drug and Gene Delivery, College of Pharmacy , Seoul National University , San 56‐1, Shillim‐Dong, Kwanak‐Gu, Seoul , 151‐742 , Korea
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13
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Bhushan R, Kumar V. Indirect resolution of baclofen enantiomers from pharmaceutical dosage form by reversed-phase liquid chromatography after derivatization with Marfey's reagent and its structural variants. Biomed Chromatogr 2008; 22:906-11. [DOI: 10.1002/bmc.1013] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Felix G, Berthod A. Part II: From Dermatologicals to Sensory Organ and Various Drugs. SEPARATION AND PURIFICATION REVIEWS 2008. [DOI: 10.1080/15422110701873007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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15
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Saleh HM, El-Henawee MM, Ragab GH, El-Hay SSA. Utility of NBD-Cl for the spectrophotometric determination of some skeletal muscle relaxant and antihistaminic drugs. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 67:1284-9. [PMID: 17223379 DOI: 10.1016/j.saa.2006.09.039] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2006] [Accepted: 09/16/2006] [Indexed: 05/13/2023]
Abstract
A simple, accurate, precise and sensitive colorimetric method for the determination of some skeletal muscle relaxant drugs, namely orphenadrine citrate (I), baclofen (II), antihistaminic drugs as acrivastine (III) and fexofenadine hydrochloride (IV) is described. This method is based on the formation of charge transfer complex with 4-chloro-7-nitro-2,1,3-benzoxadiazole (NBD-Cl) in non-aqueous medium. The orange color products were measured at 472, 465, 475 and 469 nm for drugs I, II, III and IV, respectively. The optimization of various experimental conditions was described. Beer's Law was obeyed in the range (2.5-17.5), (5-70), (2.5-25) and (10-50)microg/ml for drugs I, II, III and IV, respectively. The molar absorptivity (epsilon), sandell sensitivity, detection((LOD)) and quantitation limits((LOQ)) are calculated. The procedure was favorably applied for determination of certain pharmaceutical dosage forms containing the studied drugs. The obtained results were compared with the official and reported methods. There were no significant differences between proposed, reported and the official methods.
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Affiliation(s)
- Hanaa M Saleh
- Department of Analytical Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
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16
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Sung WC, Chen SH. Pharmacokinetic applications of capillary electrophoresis: A review on recent progress. Electrophoresis 2006; 27:257-65. [PMID: 16315169 DOI: 10.1002/elps.200500617] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This article covers recent publications from 2003 to 2005 on the subject of pharmacokinetic applications of CE. Many analytical methods were validated and more importantly, they were shown to have sufficient sensitivities to access pharmacokinetic data on different models. Because of unique advantages, such as simplified sample preparation methods, small sample amount required, high separation power, and speedy analysis, CE-based assays were found to gain popularity not only as a second method but also as a major method for many pharmacokinetic studies.
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Affiliation(s)
- Wang-Chou Sung
- Department of Chemistry, National Cheng Kung University, Tainan, Taiwan
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Kavran-Belin G, Rudaz S, Veuthey JL. Enantioseparation of baclofen with highly sulfated β-cyclodextrin by capillary electrophoresis with laser-induced fluorescence detection. J Sep Sci 2005; 28:2187-92. [PMID: 16318216 DOI: 10.1002/jssc.200500100] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The enantioseparation of baclofen (4-amino-3-p-chlorophenylbutyric acid) was achieved by CE-LIF with highly sulfated beta-CD (HS-beta-CD) as chiral selector. Naphthalene-2,3-dicarboxaldehyde was used for the derivatization of nonfluorescent baclofen. HS-beta-CD (2%) containing 50 mM borate buffer at pH 9.5 was chosen as the optimal running electrolyte and applied to the analysis of baclofen enantiomers in human plasma. The linearity of calibration curves (R2 > or = 0.998) for R-(-) and S-(+)-baclofen was in the 0.1-2.0 microM concentration range. After a simple ACN-protein precipitation, the LOD of baclofen in plasma sample was found as low as 50 nM.
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Affiliation(s)
- Gamze Kavran-Belin
- Laboratory of Mass Spectrometry, University of Geneva, Geneva, Switzerland.
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18
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Rat'ko AA, Stefan-van Staden RI. Determination of baclofen enantiomers in pharmaceutical formulations using maltodextrin-based enantioselective, potentiometric membrane electrodes. ACTA ACUST UNITED AC 2004; 59:993-7. [PMID: 15598435 DOI: 10.1016/j.farmac.2004.08.005] [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: 07/22/2004] [Accepted: 08/07/2004] [Indexed: 10/26/2022]
Abstract
Two enantioselective, potentiometric membrane electrodes (EPMEs) based on maltodextrins with different value of dextrose equivalent (DE) (maltodextrin I: DE 4.0-7.0; maltodextrin II: DE 16.5-19.5) were proposed for the assay of baclofen enantiomers in baclofen raw materials and from its pharmaceutical formulation, Norton-Baclofen tablets. The slopes of the electrode function of the proposed electrodes were 55.0 mV/pS-baclofen for maltodextrin I-based electrode and 59.0 mV/pR-baclofen for maltodextrin II-based electrode and the detection limits were 1.34 x 10(-6) mol l(-1) (S-baclofen) and 2.52 x 10(-10) mol l(-1) (R-baclofen), respectively. The surfaces of the electrodes are stable and easily renewable by simply polishing on alumina paper.
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Affiliation(s)
- Alexander A Rat'ko
- Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa
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Goda R, Murayama N, Fujimaki Y, Sudo K. Simple and sensitive liquid chromatography–tandem mass spectrometry method for determination of the S(+)- and R(−)-enantiomers of baclofen in human plasma and cerebrospinal fluid. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 801:257-64. [PMID: 14751794 DOI: 10.1016/j.jchromb.2003.11.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A simple and sensitive liquid chromatography-tandem mass spectrometry (LC/MS/MS) method to determine the enantiomers of the muscle relaxant baclofen in human plasma and cerebrospinal fluid (CSF) has been developed. A commercially available ultrafiltration membrane is used to prepare the sample. A chiral CROWNPAK CR(+) stationary phase column is then used to perform complete resolution of the S(+)- and R(-)-enantiomers of baclofen. This method was used to analyze human plasma and CSF spiked with baclofen, and the calibration curves for both biologic samples were linear over a concentration range of 0.15-150 ng enantiomer/ml. The lower limit of quantification was 0.15 ng enantiomer/ml in both fluids. Finally, the method was tested with an artificial CSF as an alternative to authentic human CSF. The results showed that no matrix effects and no interfering peaks were observed using this artificial CSF.
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Affiliation(s)
- R Goda
- Drug Metabolism and Physicochemical Property Research Laboratory, Daiichi Pharmaceutical Co. Ltd., 16-13 Kita-Kasai 1-Chome, Edogawa-ku, 134-8630 Tokyo, Japan.
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Xu H, Yu X, Chen H. Enantiomeric Separation of Basic Drugs with Partially Filled Serum Albumin as Chiral Selector in Capillary Electrophoresis. ANAL SCI 2004; 20:1409-13. [PMID: 15524192 DOI: 10.2116/analsci.20.1409] [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] [Indexed: 11/23/2022]
Abstract
A reliable method is presented for the chiral separation of three basic drugs (mexiletine, chlorpheniramine and propranolol) with serum albumins (human and porcine, HSA and PSA) as chiral selectors by capillary electrophoresis in combination with the partial filling technique. Based on the systematic optimization of operation variables, the chiral separation of mexiletine, chlorpheniramine and propranolol was achieved in the pH 7.4 phosphate buffer by using HSA, PSA and PSA as selectors, respectively. The chiral recognition ability of HSA and PSA was compared. HSA and PSA show a different chiral recognition ability for each of the three drugs. In addition, the association constants between enantiomeric drugs and proteins were determined to be 2.00 and 3.80 x 10(2) M(-1) for mexiletine and HSA, 0.59 and 1.12 x 10(3) M(-1) for chlorpheniramine and PSA, and 0.87 and 1.42 x 10(3) M(-1) for propranolol and PSA. The method for the chiral separation and determination of association constants possesses the advantages of simple performance, effective avoiding of the interference of the UV detection from protein, and lowering of the reagent consumption.
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Affiliation(s)
- Hui Xu
- Institute of Analytical Science, Department of Chemistry, Nanjing University, Nanjing, P R China
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Rat'ko AA, Stefan R. Teicoplanin‐Based Enantioselective, Potentiometric Membrane Electrodes for the Determination of R‐Baclofen in Pharmaceutical Formulations. ANAL LETT 2004. [DOI: 10.1081/al-200040315] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Ali I, Aboul-Enein HY. Optimization of the chiral resolution of baclofen by capillary electrophoresis using beta-cyclodextrin as the chiral selector. Electrophoresis 2003; 24:2064-2069. [PMID: 12858376 DOI: 10.1002/elps.200305439] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The chiral resolution of baclofen was achieved by capillary electrophoresis using a fused-silica capillary (60 cm x 75 microm ID). The background electrolyte (BGE) was phosphate buffer (pH 7.0, 50 mM)-acetonitrile (95:5 v/v) containing 10 mM beta-cyclodextrin. The applied voltage was 15 kV. The values of alpha and R(s) were 1.06 and 1.00, respectively. The electrophoretic conditions were optimized varying the pH and the ionic strength of the BGE, concentrations of beta-cyclodextrin and acetonitrile and the applied voltage.
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Affiliation(s)
- Imran Ali
- Pharmaceutical Analysis Laboratory, Biological and Medical Research Department (MBC-03), King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
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