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Zhang GH, Xi JB, Chen W, Bai ZW. Comparison in enantioseparation performance of chiral stationary phases prepared from chitosans of different sources and molecular weights. J Chromatogr A 2020; 1621:461029. [PMID: 32192704 DOI: 10.1016/j.chroma.2020.461029] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 03/07/2020] [Accepted: 03/10/2020] [Indexed: 11/15/2022]
Abstract
The aim of the present study was to compare the enantioseparation performance of chiral stationary phases (CSPs) which were derived from chitosans of different sources and molecular weights. Therefore, chitosans of shrimp and crab shells were prepared. The viscosity-average molecular weights of the chitosans both prepared from shrimp and crab shells were 2.8 × 105 and 1.4 × 105. The chitosans were isobutyrylated yielding isopropylcarbonyl chitosans which were then derivatized with 4-methylphenyl isocyanate to provide chitosan 3,6-bis(4-methylphenylcarbamate)-2-(isobutyrylamide)s. The chitosan 3,6-bis(4-methylphenylcarbamate)-2-(isobutyrylamide)s were used as chiral selectors (CSs) with which the corresponding CSPs were prepared. With the same chiral analytes and under the same mobile phase conditions, the enantioseparation capability of the CSPs was evaluated by high-performance liquid chromatography. In two CSs prepared from the same source, the one with higher molecular weight showed better enantioseparation capability; in two CSs prepared with the chitosans of the same molecular weight, the one derived from shrimp shell exhibited better performance. With regard to the two shrimp chitosan CSs, most of chiral analytes interacted more strongly with the one with lower molecular weight, and an opposite trend was found for the two crab chitosan CSs. Based on the results observed in the present study and in previous work, we believe that the influence of molecular weight on CSP enantioseparation performance is related to the substituent introduced in the CS molecule.
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Affiliation(s)
- Gui-Hua Zhang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Jiang-Bo Xi
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Wei Chen
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Zheng-Wu Bai
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China.
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Zhang GH, Fu KQ, Xi JB, Chen W, Tang S, Bai ZW. Structure screening and performance restoration of chiral separation materials based on chitosan derivatives. Carbohydr Polym 2019; 214:259-268. [PMID: 30925995 DOI: 10.1016/j.carbpol.2019.03.031] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 03/11/2019] [Accepted: 03/11/2019] [Indexed: 10/27/2022]
Abstract
In order to screen chiral selector structure and find structure-property relationship, ten chitosan 3,6-bis(phenylcarbamate)-2-(cyclopropylformamide)s were synthesized from which corresponding chiral stationary phases were prepared. Enantioseparation capability and mobile phase tolerability of the chiral stationary phases were evaluated. The chiral selectors with 3-chloro-4-methylphenyl, 4-chlorophenyl, 3-chlorophenyl, 3,5-dichlorophenyl and 4-trifluoromethoxyphenyl groups demonstrated powerful enantioseparation capability. Enantioseparation capability was found to be dependent on a match between the substituent at C2 and the one attached to phenyl group at C3/C6 of glucose unit in the chitosan derivatives. Moreover, the tolerability tests revealed that the developed chiral stationary phases were highly tolerable to pure ethyl acetate, pure acetone and n-hexane/tetrahydrofuran of various ratios. In addition, n-hexane/tetrahydrofuran was found to be a modifier to adjust suprastructure of the chitosan derivatives, resulting in an improvement or restoration in enantioseparation. This observation implies n-hexane/tetrahydrofuran may make a damaged chiral selector restore its enantioseparation capability.
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Affiliation(s)
- Gui-Hua Zhang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Ke-Qin Fu
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Jiang-Bo Xi
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Wei Chen
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Sheng Tang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China
| | - Zheng-Wu Bai
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China.
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Yang F, Cai ML, Chen W, Bai ZW. Performances comparison of enantiomeric separation materials prepared from shrimp and crab shells. Carbohydr Polym 2019; 204:238-246. [DOI: 10.1016/j.carbpol.2018.10.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 09/16/2018] [Accepted: 10/07/2018] [Indexed: 10/28/2022]
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Xie SM, Yuan LM. Recent development trends for chiral stationary phases based on chitosan derivatives, cyclofructan derivatives and chiral porous materials in high performance liquid chromatography. J Sep Sci 2018; 42:6-20. [PMID: 30152091 DOI: 10.1002/jssc.201800656] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 08/20/2018] [Accepted: 08/20/2018] [Indexed: 11/06/2022]
Abstract
The separation of enantiomers by chromatographic methods, such as gas chromatography, high-performance liquid chromatography and capillary electrochromatography, has become an increasingly significant challenge over the past few decades due to the demand of pharmaceutical, agrochemical, and food analysis. Among these chromatographic resolution methods, high-performance liquid chromatography based on chiral stationary phases has become the most popular and effective method used for the analytical and preparative separation of optically active compounds. This review mainly focuses on the recent development trends for novel chiral stationary phases based on chitosan derivatives, cyclofructan derivatives, and chiral porous materials that include metal-organic frameworks and covalent organic frameworks in high-performance liquid chromatography. The enantioseparation performance and chiral recognition mechanisms of these newly developed chiral selectors toward enantiomers are discussed in detail.
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Affiliation(s)
- Sheng-Ming Xie
- Department of Chemistry, Yunnan Normal University, Kunming, P. R. China
| | - Li-Ming Yuan
- Department of Chemistry, Yunnan Normal University, Kunming, P. R. China
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Tang S, Mei X, Chen W, Huang SH, Bai ZW. A high-performance chiral selector derived from chitosan (p-methylbenzylurea) for efficient enantiomer separation. Talanta 2018; 185:42-52. [PMID: 29759222 DOI: 10.1016/j.talanta.2018.03.048] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 03/02/2018] [Accepted: 03/14/2018] [Indexed: 12/11/2022]
Abstract
N-Methoxycarbonyl chitosan was prepared by selectively modifying the amino group at the 2-position of chitosan with methyl chloroformate, which was further functionalized with p-methylbenzylamine to produce chitosan (p-methylbenzylurea). Then, the hydroxyl groups at the 3- and 6-positions of the glucose skeleton were modified with various phenyl isocyanates, affording a series of chitosan 3,6-bis(arylcarbamate)-2-(p-methylbenzylurea)s, which were characterized and proposed as chiral selectors for enantiomer separation. Nineteen racemates, most of which are drugs or intermediates for drugs, were selected as the model analytes to evaluate the enantioseparation performance. The structure-performance relationship of the chiral selectors was investigated in detail. It was found that the methyl-substituted chiral selectors possessed more preferable enantioseparation performance compared with the chloro-substituted ones, and the chiral selectors containing a methyl substituent at the 4-position of the benzene ring showed the best chiral recognition and separation ability with 17 racemates being recognized and 13 racemates being baseline separated. The prepared chiral separation materials derived from these chiral selectors exhibited favorable solvent tolerance towards ethyl acetate, acetone, chloroform and a low proportion of tetrahydrofuran in normal phase. To sum up, this work provided a useful reference for the design and preparation of high-performance chiral separation materials for efficient enantiomer separation.
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Affiliation(s)
- Sheng Tang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Xiaomeng Mei
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Wei Chen
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Shao-Hua Huang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Zheng-Wu Bai
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China.
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Tang S, Liu JD, Chen W, Huang SH, Zhang J, Bai ZW. Performance comparison of chiral separation materials derived from N-cyclohexylcarbonyl and N-hexanoyl chitosans. J Chromatogr A 2017; 1532:112-123. [PMID: 29246422 DOI: 10.1016/j.chroma.2017.11.067] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 11/17/2017] [Accepted: 11/28/2017] [Indexed: 11/28/2022]
Abstract
Chitosan bis(phenylcarbamate)-(N-cyclohexylformamide)s and chitosan bis(phenylcarbamate)-(N-hexanamide)s were synthesized as chiral selectors for enantiomeric separation. Since two types of substituents with different structures were, respectively, introduced onto the 2-position and the 3-/6-positions of the glucose skeleton in the chitosans through a "heterogeneous" modification pathway, the enantioseparation performances of the chiral selectors could be improved. Influence of the type and position of the substituents on chiral recognition and enantioseparation abilities was studied in detail, and the structural dependence on enantioseparation performance was particularly demonstrated. It was found that methyl- and chloro-substituted chitosan bis(phenylcarbamate)-(N-hexanamide)s possessed comparable enantioseparation performances, whereas chloro-substituted chitosan bis(phenylcarbamate)-(N-cyclohexylformamide)s exhibited much more powerful chiral recognition and enantioseparation abilities than the methyl-substituted ones. Among all the prepared chiral selectors, those with the combination of the cyclohexyl group at the 2-position of the glucose skeleton in the chitosan derivatives and the chlorophenyl group at the 3-/6-positions seemed to be more preferable for enantiomeric separation. As a result, the chitosan bis(3,4-dichlorophenylcarbamate)-(N-cyclohexylformamide) possessed the best enantioseparation performance. The solvent tolerability of the prepared chiral selectors was also investigated in the present study. Compared with the classical coated-type chiral separation materials derived from cellulose/amylose derivatives, the N-cyclohexylcarbonyl and N-hexanoyl chitosans based chiral stationary phases were observed to possess more favorable solvent tolerability, thus possibly widening their applications for various practical enantioseparations.
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Affiliation(s)
- Sheng Tang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Jian-De Liu
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Wei Chen
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Shao-Hua Huang
- Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
| | - Juan Zhang
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China
| | - Zheng-Wu Bai
- School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China.
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Chiral Stationary Phases for Liquid Chromatography Based on Chitin- and Chitosan-Derived Marine Polysaccharides. Symmetry (Basel) 2017. [DOI: 10.3390/sym9090190] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Liang S, Huang SH, Chen W, Bai ZW. High-performance chiral stationary phases based on chitosan derivatives with a branched-chain alkyl urea. Anal Chim Acta 2017; 985:183-193. [DOI: 10.1016/j.aca.2017.07.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 06/26/2017] [Accepted: 07/02/2017] [Indexed: 10/19/2022]
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Mei XM, Chen W, Bai ZW. Enantioseparation characteristics of the chiral stationary phases based on natural and regenerated chitins. J Sep Sci 2017; 40:1710-1717. [DOI: 10.1002/jssc.201700032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 02/14/2017] [Accepted: 02/14/2017] [Indexed: 01/06/2023]
Affiliation(s)
- Xiao-Meng Mei
- School of Chemistry and Environmental Engineering; Wuhan Institute of Technology; Wuhan P.R. China
| | - Wei Chen
- School of Chemistry and Environmental Engineering; Wuhan Institute of Technology; Wuhan P.R. China
| | - Zheng-Wu Bai
- School of Chemistry and Environmental Engineering; Wuhan Institute of Technology; Wuhan P.R. China
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Bai ZW, Yang F, Fu KQ, Wang XC, Liu JD, Chen W, Huang SH, Tang S. Evaluation and comparison of N-cycloalkylformylated chitosan bis(arylcarbamate)s as chiral selectors for enantioseparation. NEW J CHEM 2017. [DOI: 10.1039/c7nj01611e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral separation materials were prepared by coating chitosan bis(3,5-dimethylphenylcarbamate)-(N-cycloalkylformamide)s onto silica gel for enantiomeric separations.
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Affiliation(s)
- Zheng-Wu Bai
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430205
- China
| | - Fei Yang
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430205
- China
| | - Ke-Qin Fu
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430205
- China
| | - Xiao-Chen Wang
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430205
- China
| | - Jian-De Liu
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430205
- China
| | - Wei Chen
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430205
- China
| | - Shao-Hua Huang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao 266101
- China
| | - Sheng Tang
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430205
- China
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