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Ma X, Fan Z, Tang Z, Cai L. Investigation on improvement of enantioseparation based on clindamycin phosphate by chiral deep eutectic solvents in capillary electrophoresis. J Sep Sci 2024; 47:e2300847. [PMID: 38356235 DOI: 10.1002/jssc.202300847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 01/19/2024] [Accepted: 01/21/2024] [Indexed: 02/16/2024]
Abstract
In this work, the potential synergetic effect between deep eutectic solvents and an antibiotic chiral selector (clindamycin phosphate) for enantioseparation was investigated in capillary electrophoresis. We synthesized a series of deep eutectic solvents with choline chloride as hydrogen bond acceptor and three α-hydroxyl acids (l-lactic acid, l-malic acid, and l-tartaric acid) as hydrogen bond donors. Compared to the single clindamycin phosphate separation system, significantly improved separations of model drugs were observed in several synergetic systems. Compared to deep eutectic solvents with a single hydrogen bond donor, deep eutectic solvents with mixed-type hydrogen bond donors were superior. The influences of several key parameters including the type and proportion of organic modifier, clindamycin phosphate concentrations, deep eutectic solvents concentrations, and buffer pH were investigated in detail. The mechanism of the enhanced separations in deep eutectic solvents systems was investigated by means of electroosmotic flow analysis, nuclear magnetic resonance analysis, and molecular modeling. It was the first time that the synergetic systems between deep eutectic solvents and antibiotic chiral selector were established in capillary electrophoresis, and these deep eutectic solvents were demonstrated to have a good synergetic effect with clindamycin phosphate for enantioseparation.
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Affiliation(s)
- Xiaofei Ma
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong, P. R. China
| | - Zhenyu Fan
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong, P. R. China
| | - Zhiyuan Tang
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong, P. R. China
| | - Liangliang Cai
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong, P. R. China
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Tang L, Chen Y, Wu M, Tang T, Yao Y. Comparative studies of immobilized polysaccharide derivatives chiral stationary phases for enantioseparation of furanocoumarins and dihydroflavones and discussion on chiral recognition mechanism. J Sep Sci 2023; 46:e2300318. [PMID: 37590330 DOI: 10.1002/jssc.202300318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 06/24/2023] [Accepted: 07/31/2023] [Indexed: 08/19/2023]
Abstract
Enantiomeric separation of furanocoumarins and dihydroflavones compounds were systematically studied in the normal-phase mode using four different polysaccharide-type chiral stationary phases, namely, Chiralpak IA, Chiralpak IC, Chiralpak IG, and Chiralpak IK-3 by high-performance liquid chromatography. The effect of alcohol modifiers and alcohol content on enantiomeric separation was evaluated for the separation of furanocoumarins and dihydroflavones. All the eight compounds have achieved baseline separation with the resolutions ranging between 1.52 and 23.11. For a better insight into the enantiorecognition mechanisms, thermodynamic analysis was carried out. The mechanisms of chiral recognition have been discussed. Among four chiral columns, Chiralpak IG exhibited the most universal and the best enantioseparation ability toward furanocoumarins and dihydroflavones when used n-hexane-isopropanol and n-hexane-ethanol as mobile phase, respectively. The steric hindrance, hydrogen bonding, and π-π interaction played major roles in chiral recognition on Chiralpak IG. By comparing four chiral columns, this work systematically analyzed the separation methods of furanocoumarins and dihydroflavones for the first time and reported some active chiral ingredients of traditional Chinese medicine that have never been separated, which provided a further insight into the enantioseparation of furanocoumarins and dihydroflavones on chiral stationary phases.
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Affiliation(s)
- Luhuan Tang
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China
| | - Yanyan Chen
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China
| | - Mengru Wu
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China
| | - Tingting Tang
- College of Pharmaceutical Engineering, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China
| | - Yaqi Yao
- College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin, P. R. China
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Ma X, Chen B, Cai L. Investigation on improvement of enantioseparation in capillary electrophoresis based on maltodextrin by chiral ionic liquids. J Sep Sci 2022; 45:3604-3613. [PMID: 35916273 DOI: 10.1002/jssc.202200408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/12/2022] [Accepted: 07/18/2022] [Indexed: 11/10/2022]
Abstract
Taking advantage of chiral ionic liquids, this study deals with the improvement of the enantioseparation performance of a traditional chiral selector (maltodextrin) in capillary electrophoresis. Herein, two polyhydroxy compound-based chiral ionic liquids, namely tetramethylammonium-D-gluconic acid and tetramethylammonium-shikimic acid were designed and utilized as additives for chiral separation for the first time. The synergistic systems provided much better enantioseparations of twelve model drugs compared to the single maltodextrin system. These model analytes contained analgesics, antidepressants, antiallergic drugs, antifungal drugs, antihypertensive drugs, and antiparkinsonian drugs. After optimizing the separation conditions, the chiral recognition mechanism was probed by means of ultraviolet spectroscopy, nuclear magnetic resonance, and molecular modeling. The results of spectroscopic and computational analyses were in good consistency with enantioseparation outcomes. Finally, the proposed method was successfully used for the determination of the enantiomeric purity of duloxetine hydrochloride.
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Affiliation(s)
- Xiaofei Ma
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong, P. R. China
| | - Bohua Chen
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong, P. R. China
| | - Liangliang Cai
- Department of Pharmacy, Affiliated Hospital of Nantong University, Nantong, P. R. China
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Haginaka J. Progress in Chiral Stationary Phases Based on Proteins and Glycoproteins. Chem Pharm Bull (Tokyo) 2022; 70:458-468. [PMID: 35786565 DOI: 10.1248/cpb.c22-00269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A lot of chiral stationary phases (CSPs) have been introduced for the purpose of analytical and preparative separations of enantiomers. CSPs based on proteins and glycoproteins have unique properties among those CSPs. This review article deals with the preparation of CSPs based on proteins and glycoproteins, their chiral recognition properties and mechanisms, focusing on the CSPs investigated in our group. The dealt proteins and glycoproteins are including bovine serum albumin, human serum albumin, lysozyme, pepsin, human α1-acid glycoprotein (AGP), chicken ovomucoid and chicken ovoglycoprotein (named chicken AGP).
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Affiliation(s)
- Jun Haginaka
- Institute for Biosciences, Mukogawa Women's University
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Ma Q, Cong W, Liu Y, Geng Z, Lin Y, Wang Z. Experimental and computational study on the enantioseparation of four chiral fluoroquinolones by capillary electrophoresis with sulfated-β-cyclodextrin as chiral selector. Chirality 2021; 33:549-557. [PMID: 34275169 DOI: 10.1002/chir.23340] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 06/09/2021] [Accepted: 07/06/2021] [Indexed: 11/10/2022]
Abstract
In this work, enantioseparation of four chiral fluoroquinolones (FQs), namely, ofloxacin, gemifloxacin, lomefloxacin, and gatifloxacin, was achieved by capillary electrophoresis with sulfated-β-cyclodextrin (S-β-CD) as chiral selector. Factors affecting the enantiomeric resolution, such as the concentrations of S-β-CD, BGE pH conditions, and the buffer types and concentrations, were optimized and discussed. A BGE consisting of 30 g/L S-β-CD and 30-mM phosphate at pH 4.0 was found fit for enantiomeric resolution of ofloxacin and gemifloxacin, while the same BGE at pH 3.0 was suitable for enantioseparation of lomefloxacin and gatifloxacin. The pH-dependent experiments showed that separation resolutions of four FQs enantiomers were significantly affected by BGE pH, which was thought to be related with the varying electrostatic attraction between the enantiomers and chiral selector. To verify this speculation, molecular docking studies were used for further investigation of the enantiomeric recognition mechanism of S-β-CD. Molecular model indicated that hydrophobic effect and hydrogen bond were involved in host-guest inclusion, but the electrostatic attraction enhanced the chiral discrimination by increasing the difference in binding energy between individual enantiomers and S-β-CD. This work provided a further insight into the chiral recognition mechanisms of CD derivatives.
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Affiliation(s)
- Qianyun Ma
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Wei Cong
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Ye Liu
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Zikai Geng
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Ying Lin
- School of Pharmacy, Binzhou Medical University, Yantai, China
| | - Zhaokun Wang
- School of Pharmacy, Binzhou Medical University, Yantai, China
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Li W, Liu C, Tan G, Zhang X, Zhu Z, Chai Y. Molecular modeling study of chiral separation and recognition mechanism of β-adrenergic antagonists by capillary electrophoresis. Int J Mol Sci 2012; 13:710-725. [PMID: 22312281 PMCID: PMC3269715 DOI: 10.3390/ijms13010710] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 12/13/2011] [Accepted: 12/31/2011] [Indexed: 11/16/2022] Open
Abstract
Chiral separations of five β-adrenergic antagonists (propranolol, esmolol, atenolol, metoprolol, and bisoprolol) were studied by capillary electrophoresis using six cyclodextrins (CDs) as the chiral selectors. Carboxymethylated-β-cyclodextrin (CM-β-CD) exhibited a higher enantioselectivity power compared to the other tested CDs. The influences of the concentration of CM-β-CD, buffer pH, buffer concentration, temperature, and applied voltage were investigated. The good chiral separation of five β-adrenergic antagonists was achieved using 50 mM Tris buffer at pH 4.0 containing 8 mM CM-β-CD with an applied voltage of 24 kV at 20 °C. In order to understand possible chiral recognition mechanisms of these racemates with CM-β-CD, host-guest binding procedures of CM-β-CD and these racemates were studied using the molecular docking software Autodock. The binding free energy was calculated using the Autodock semi-empirical binding free energy function. The results showed that the phenyl or naphthyl ring inserted in the hydrophobic cavity of CM-β-CD and the side chain was found to point out of the cyclodextrin rim. Hydrogen bonding between CM-β-CD and these racemates played an important role in the process of enantionseparation and a model of the hydrogen bonding interaction positions was constructed. The difference in hydrogen bonding formed with the -OH next to the chiral center of the analytes may help to increase chiral discrimination and gave rise to a bigger separation factor. In addition, the longer side chain in the hydrophobic phenyl ring of the enantiomer was not beneficial for enantioseparation and the chiral selectivity factor was found to correspond to the difference in binding free energy.
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Affiliation(s)
- Wuhong Li
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mails: (W.L.); (C.L.); (G.T.); (X.Z.); (Z.Z.)
- Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Second Military Medical University, Shanghai 200433, China
| | - Changhai Liu
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mails: (W.L.); (C.L.); (G.T.); (X.Z.); (Z.Z.)
| | - Guangguo Tan
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mails: (W.L.); (C.L.); (G.T.); (X.Z.); (Z.Z.)
- Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Second Military Medical University, Shanghai 200433, China
| | - Xinrong Zhang
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mails: (W.L.); (C.L.); (G.T.); (X.Z.); (Z.Z.)
| | - Zhenyu Zhu
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mails: (W.L.); (C.L.); (G.T.); (X.Z.); (Z.Z.)
- Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Second Military Medical University, Shanghai 200433, China
| | - Yifeng Chai
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China; E-Mails: (W.L.); (C.L.); (G.T.); (X.Z.); (Z.Z.)
- Shanghai Key Laboratory for Pharmaceutical Metabolite Research, Second Military Medical University, Shanghai 200433, China
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