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Rais S, Islam A, Ahmad I, Kumar S, Chauhan A, Javed H. Preparation of a new magnetic ion-imprinted polymer and optimization using Box-Behnken design for selective removal and determination of Cu(II) in food and wastewater samples. Food Chem 2020; 334:127563. [PMID: 32791433 DOI: 10.1016/j.foodchem.2020.127563] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 06/25/2020] [Accepted: 07/09/2020] [Indexed: 12/23/2022]
Abstract
A new magnetic Cu(II) IIP (Fe3O4@IIP-IDC) is synthesized by polymerization of Imidazole-4,5-dicarboxylic acid functionalized Allyl chloride, and significant improvement of its performance has been compared. SPE parameters were optimized using Box-Behnken design to achieve the twin objectives of quantitative determination and removal of Cu(II). FLPSO kinetic model and BS isotherm model fits well with the capacity of 175 mg g-1. Analytical figures of merit includes a linearity range of 10-5,000 µg L-1 (R2 = 0.9986), preconcentration factor of 50 after eluting with 5 mL of 1 M HNO3, LOD of 1.03 µg L-1 and LOQ of 4.5 µg L-1. Accuracy was assessed by analysis of SRM (Standard Reference Material) and recovery experiments after spiking in food samples (Tea, coffee, chocolate, spinach, infant milk substitute) and battery wastewater. Ease of use, reusability (15 cycles), rapid adsorption and high selectivity makes it a promising candidate for efficient and selective removal and trace determination.
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Affiliation(s)
- Saman Rais
- Analytical Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
| | - Aminul Islam
- Analytical Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India.
| | - Izhar Ahmad
- Analytical Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
| | - Suneel Kumar
- Analytical Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
| | - Anjali Chauhan
- Analytical Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
| | - Hina Javed
- Analytical Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
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Abu-Alsoud GF, Hawboldt KA, Bottaro CS. Comparison of Four Adsorption Isotherm Models for Characterizing Molecular Recognition of Individual Phenolic Compounds in Porous Tailor-Made Molecularly Imprinted Polymer Films. ACS APPLIED MATERIALS & INTERFACES 2020; 12:11998-12009. [PMID: 32023026 DOI: 10.1021/acsami.9b21493] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A molecularly imprinted polymer (MIP) film using catechol as the template was designed for adsorption of a range of phenols from water. Four different isotherm models (Langmuir (LI), Freundlich (FI), Langmuir-Freundlich (L-FI), and Brunauer, Emmett, and Teller (BET)) were used to study the MIP adsorption of five phenolic compounds: phenol (Ph), 2-methylphenol (2-MP), 3-methylphenol (3-MP), 2-chlorophenol (2-CP), and 4-teroctylphenol (4-OP). Each model was evaluated for its fit with the experimental data, and key parameters, including a number of binding sites and binding site energies, were compared. Though the LI, L-FI, and BET models showed good agreement for estimation of the number of binding sites and affinity for most adsorbates, no single model was suitable for all. The LI and L-FI models gave the best fitting statistics for the Ph, 2-MP, 3-MP, and 2-CP. The recognition of 4-OP, which has much higher binding affinities than the smaller phenolic compounds not attributable to hydrophobicity alone, was explained only by the BET model, which indicates the formation of multilayers. The BET model failed only with phenol. MIPs also showed higher adsorption capacities and improved homogeneity over the analogous non-imprinted polymers.
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Affiliation(s)
- Ghadeer F Abu-Alsoud
- Department of Chemistry, Memorial University of Newfoundland, St. John's, NL A1B 3X7, Canada
| | - Kelly A Hawboldt
- Department of Process Engineering, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada
| | - Christina S Bottaro
- Department of Chemistry, Memorial University of Newfoundland, St. John's, NL A1B 3X7, Canada
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Culver HR, Peppas NA. Protein-Imprinted Polymers: The Shape of Things to Come? CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2017; 29:5753-5761. [PMID: 30880872 PMCID: PMC6420229 DOI: 10.1021/acs.chemmater.7b01936] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The potential to develop materials with antibody-like molecular recognition properties has helped sustain interest in protein-imprinted polymers over the past several decades. Unfortunately, despite persistent research, the field of noncovalent protein imprinting has seen limited success in terms of achieving materials with high selectivity and high affinity. In this Perspective, important yet sometimes overlooked aspects of the imprinting and binding processes are reviewed to help understand why there has been limited success. In particular, the imprinting and binding processes are viewed through the scope of free radical polymerization and hydrogel swelling theories to underscore the complexity of the synthesis and behavior of protein-imprinted polymers. Additionally, we review the metrics of success commonly used in protein imprinting literature (i.e., adsorption capacity, imprinting factor, and selectivity factor) and consider the relevance of each to the characterization of an imprinted polymer's recognition characteristics. Throughout, common shortcomings are highlighted, and experiments that could help verify or disprove the efficacy of noncovalent protein imprinting are discussed.
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Affiliation(s)
- Heidi R. Culver
- Institute for Biomaterials, Drug Delivery, and Regenerative Medicine, C0800, The University of Texas at Austin, Austin, Texas 78712, United States
- Department of Biomedical Engineering, C0800, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Nicholas A. Peppas
- Institute for Biomaterials, Drug Delivery, and Regenerative Medicine, C0800, The University of Texas at Austin, Austin, Texas 78712, United States
- Department of Biomedical Engineering, C0800, The University of Texas at Austin, Austin, Texas 78712, United States
- McKetta Department of Chemical Engineering, C0400, The University of Texas at Austin, Austin, Texas 78712, United States
- Department of Surgery and Perioperative Care, Dell Medical School, The University of Texas at Austin, Austin, Texas 78712, United States
- College of Pharmacy, A1900, The University of Texas at Austin, Austin, Texas 78712, United States
- Corresponding Author:
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Ma L, Tang L, Li RS, Huang YP, Liu ZS. Water-compatible molecularly imprinted polymers prepared using metal–organic gel as porogen. RSC Adv 2015. [DOI: 10.1039/c5ra16029d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel water-compatible approach suitable for molecular imprinting was described by using metal–organic gel (MOG) as the porogenic solvent.
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Affiliation(s)
- Li Ma
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics)
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- China
| | - Lei Tang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics)
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- China
| | - Rong-Shan Li
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics)
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- China
| | - Yan-Ping Huang
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics)
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- China
| | - Zhao-Sheng Liu
- Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and Diagnostics (Theranostics)
- School of Pharmacy
- Tianjin Medical University
- Tianjin 300070
- China
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Askim JR, Mahmoudi M, Suslick KS. Optical sensor arrays for chemical sensing: the optoelectronic nose. Chem Soc Rev 2014; 42:8649-82. [PMID: 24091381 DOI: 10.1039/c3cs60179j] [Citation(s) in RCA: 466] [Impact Index Per Article: 46.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A comprehensive review is presented on the development and state of the art of colorimetric and fluorometric sensor arrays. Optical arrays based on chemoresponsive colorants (dyes and nanoporous pigments) probe the chemical reactivity of analytes, rather than their physical properties. This provides a high dimensionality to chemical sensing that permits high sensitivity (often down to ppb levels), impressive discrimination among very similar analytes and exquisite fingerprinting of extremely similar mixtures over a wide range of analyte types, both in the gas and liquid phases.
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Affiliation(s)
- Jon R Askim
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Av., Urbana, Illinois 61801, USA.
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Soares da Silva M, Viveiros R, Aguiar-Ricardo A, Bonifácio VDB, Casimiro T. Supercritical fluid technology as a new strategy for the development of semi-covalent molecularly imprinted materials. RSC Adv 2012. [DOI: 10.1039/c2ra20426f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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7
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Holland N, Frisby J, Owens E, Hughes H, Duggan P, McLoughlin P. The influence of polymer morphology on the performance of molecularly imprinted polymers. POLYMER 2010. [DOI: 10.1016/j.polymer.2009.10.035] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kirk C, Jensen M, Kjaer CN, Smedskjaer MM, Larsen KL, Wimmer R, Yu D. Aqueous batch rebinding and selectivity studies on sucrose imprinted polymers. Biosens Bioelectron 2009; 25:623-8. [DOI: 10.1016/j.bios.2009.01.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2008] [Revised: 01/09/2009] [Accepted: 01/13/2009] [Indexed: 10/21/2022]
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Athikomrattanakul U, Katterle M, Gajovic-Eichelmann N, Scheller FW. Development of molecularly imprinted polymers for the binding of nitrofurantoin. Biosens Bioelectron 2009; 25:82-7. [DOI: 10.1016/j.bios.2009.06.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 05/19/2009] [Accepted: 06/02/2009] [Indexed: 11/25/2022]
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Abstract
Traditional Chinese medicines (TCMs) are getting more and more popular nowadays in the whole world for improving health condition of human beings as well as preventing and healing diseases. TCM is a multi-component system with components mostly unknown, and only a few compounds are responsible for the pharmaceutical and/or toxic effects. The large numbers of other components in the TCM make the screening and analysis of the bioactive components extremely difficult. So, separation and analysis of the desired chemical components in TCM are very important subjects for modernization research of TCM. Thus, many novel separation techniques with significant advantages over conventional methods were introduced and applied to separation and analysis of the chemical constituents in TCM. This review presents just a brief outline of the applications of different separation methods for the isolation and analysis of TCM constituents.
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Affiliation(s)
- Shao Liu
- College of Chemistry and Chemical Engineering, Research Center of Modernization of Chinese Medicines, Central South University, Changsha, PR China
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11
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Molecularly imprinted polymers for RGD selective recognition and separation. Amino Acids 2008; 36:563-9. [DOI: 10.1007/s00726-008-0118-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2007] [Accepted: 06/09/2008] [Indexed: 10/21/2022]
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12
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Wang XJ, Xu ZL, Feng JL, Bing NC, Yang ZG. Molecularly imprinted membranes for the recognition of lovastatin acid in aqueous medium by a template analogue imprinting strategy. J Memb Sci 2008. [DOI: 10.1016/j.memsci.2007.12.067] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Wei S, Mizaikoff B. Binding site characteristics of 17β-estradiol imprinted polymers. Biosens Bioelectron 2007; 23:201-9. [PMID: 17540554 DOI: 10.1016/j.bios.2007.03.031] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2007] [Revised: 03/22/2007] [Accepted: 03/27/2007] [Indexed: 11/25/2022]
Abstract
The variety of applications utilizing molecularly imprinted polymers (MIPs) requires synthetic strategies yielding different MIP formats including films, irregular particles, or spheres, along with precise knowledge on the specific material characteristics, such as binding capacity and binding efficiency of these materials. In response to this demand, MIPs are prepared in different formats by variation of the polymerization methodology. It is commonly agreed that micro- and sub-microspheres are particularly advantageous MIP formats, due to their monodispersity and facile synthesis procedures in contrast to conventional imprinted polymers prepared by bulk polymerization. However, the differences in actual rebinding characteristics of different MIP formats based on molecular interactions under a variety of binding/rebinding conditions have not been studied in detail to date. Consequently, the present work details an analytical strategy generically applicable to MIP systems for rebinding studies including equilibrium binding, non-equilibrium binding, and release experiments enabling more profound understanding on the molecular interactions between the imprinted materials and the template molecules. In this study, three MIP formats were considered for the same template molecule, 17beta-estradiol: irregularly shaped particulate polymers prepared by bulk polymerization and grinding, microspheres, and sub-microspheres. The latter two formats were synthesized via precipitation polymerization using different processing strategies. The morphologies and porosities of the resulting imprinted materials were characterized by scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) analysis, respectively. The obtained results indicate that microspheres prepared by precipitation polymerization provide superior rebinding properties during equilibrium binding in contrast to bulk polymers and sub-microspheres, and that the rebinding properties are different during equilibrium binding versus non-equilibrium binding. The median binding affinity constant determined during non-equilibrium rebinding is higher than the values obtained from equilibrium rebinding. Furthermore, the binding site distribution appears more homogeneous thief derived from non-equilibrium rebinding, as reflected in a heterogeneity index of m=0.725. Moreover, it is hypothesized that the specific interactions between template and monomers are related to the porosity of the imprinted polymers, which implies that the amount of binding sites and the pore sized distribution of the imprinted materials are a critical factor in achieving the desired MIP performance in various analytical applications. The BET results indicate that particles prepared with lower cross-linker-to-template ratio have a reduced surface area. Furthermore, it can be expected that there are less specific binding sites available at particles with reduced surface area and pore volume given similar distribution of the binding sites, as confirmed by the equilibrium binding isotherm studies. The pore size distribution results reveal that control of the pore size in the range of 100-180 A is essential to obtain the desired retention properties and Gaussian peak shape during HPLC analysis of small molecules.
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Affiliation(s)
- Shuting Wei
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA
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14
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Stephenson CJ, Shimizu KD. Colorimetric and fluorometric molecularly imprinted polymer sensors and binding assays. POLYM INT 2007. [DOI: 10.1002/pi.2206] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Li W, Li S. Molecular Imprinting: A Versatile Tool for Separation, Sensors and Catalysis. OLIGOMERS # POLYMER COMPOSITES # MOLECULAR IMPRINTING 2006. [DOI: 10.1007/12_2006_105] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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16
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Alexander C, Andersson HS, Andersson LI, Ansell RJ, Kirsch N, Nicholls IA, O'Mahony J, Whitcombe MJ. Molecular imprinting science and technology: a survey of the literature for the years up to and including 2003. J Mol Recognit 2006; 19:106-80. [PMID: 16395662 DOI: 10.1002/jmr.760] [Citation(s) in RCA: 776] [Impact Index Per Article: 43.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Over 1450 references to original papers, reviews and monographs have herein been collected to document the development of molecular imprinting science and technology from the serendipitous discovery of Polyakov in 1931 to recent attempts to implement and understand the principles underlying the technique and its use in a range of application areas. In the presentation of the assembled references, a section presenting reviews and monographs covering the area is followed by papers dealing with fundamental aspects of molecular imprinting and the development of novel polymer formats. Thereafter, literature describing attempts to apply these polymeric materials to a range of application areas is presented.
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Affiliation(s)
- Cameron Alexander
- The School of Pharmacy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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Baggiani C, Giraudi G, Giovannoli C, Tozzi C, Anfossi L. Adsorption isotherms of a molecular imprinted polymer prepared in the presence of a polymerisable template. Anal Chim Acta 2004. [DOI: 10.1016/s0003-2670(03)00671-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Hilal N, Kochkodan V, Windsor P, Lester E. Composite Microfiltration Membranes Imprinted with cAMP. Chem Eng Technol 2003. [DOI: 10.1002/ceat.200390069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Zhu L, Xu X. Selective separation of active inhibitors of epidermal growth factor receptor from Caragana jubata by molecularly imprinted solid-phase extraction. J Chromatogr A 2003; 991:151-8. [PMID: 12741595 DOI: 10.1016/s0021-9673(03)00207-3] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A feasibility research was performed to study the possibilities of using a molecularly imprinted polymer as sorbent material in solid-phase extraction for the separation of active inhibitors of epidermal growth factor receptor (EGRF) from Caragana Jubata, a Chinese traditional Tibetan medicine. A molecularly imprinted polymer using quercetin, an active anti-EGFR inhibitor (IC50 = 15 microM), as the template and acrylamide as the functional monomer was prepared. The polymer was evaluated as a selective sorbent in molecularly imprinted solid-phase extraction. The EtOAc extract of Caragana Jubata was loaded on the polymer, and two novel active anti-EGFR inhibitors were found to be selectively retained after washing the polymer with appropriate solvent to disrupt the non-specific interactions occurring between the sample and the polymer matrix, which were identified as (E)-piceatannol (IC50 =4.9 microM) and butein (IC50 = 10 microM). The present work affords us a new potential method for selective separation of bioactive components from herb by using molecularly imprinted polymer as a solid-phase extraction adsorbent.
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Affiliation(s)
- Lili Zhu
- Department of Chemistry and Molecular Engineering, Yangshengtang Joint Laboratory for Natural Products, Peking University, Beijing 100871, China
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20
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Umpleby RJ, Rushton GT, Shah RN, Rampey AM, Bradshaw JC, Berch JK, Shimizu KD. Recognition Directed Site-Selective Chemical Modification of Molecularly Imprinted Polymers. Macromolecules 2001. [DOI: 10.1021/ma010903s] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Robert J. Umpleby
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Gregory T. Rushton
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Ripal N. Shah
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Andrew M. Rampey
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Jessica C. Bradshaw
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - John K. Berch
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
| | - Ken D. Shimizu
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208
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Umpleby RJ, Baxter SC, Bode M, Berch JK, Shah RN, Shimizu KD. Application of the Freundlich adsorption isotherm in the characterization of molecularly imprinted polymers. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(00)01211-3] [Citation(s) in RCA: 175] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Molecularly imprinted polymers in enantiomer separations. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0167-9244(01)80020-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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23
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De Bruin TJ, Marcelis AT, Zuilhof H, Rodenburg LM, Niederländer HA, Koudijs A, Overdevest PE, Van der Padt A, Sudhölter EJ. Separation of amino acid enantiomers by micelle-enhanced ultrafiltration. Chirality 2000; 12:627-36. [PMID: 10897100 DOI: 10.1002/1520-636x(2000)12:8<627::aid-chir5>3.0.co;2-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A Micelle-enhanced ultrafiltration (MEUF) separation process was investigated that can potentially be used for large-scale enantioseparations. Copper(II)-amino acid derivatives dissolved in nonionic surfactant micelles were used as chiral selectors for the separation of dilute racemic amino acids solutions. For the alpha-amino acids phenylalanine, phenylglycine, O-methyltyrosine, isoleucine, and leucine good separation was obtained using cholesteryl L-glutamate and Cu(II) ions as chiral selector with an operational enantioselectivity (alpha(op)) up to 14.5 for phenylglycine. From a wide set of substrates, including four beta-amino acids, it was concluded that the performance of this system is determined by two factors: the hydrophobicity of the racemic amino acid, which results in a partitioning of the racemic amino acid over micelle and aqueous solution, and the stability of the diastereomeric complex formed upon binding of the amino acid with the chiral selector. The chiral hydrophobic cholesteryl anchor of the chiral selector also plays an active role in the recognition process, since inversion of the chirality of the glutamate does not yield the reciprocal enantioselectivities. However, if the cholesteryl group is replaced by a nonchiral alkyl chain, reciprocal operational enantioselectivities are found with enantiomeric glutamate selectors.
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Affiliation(s)
- T J De Bruin
- Laboratory of Organic Chemistry, Wageningen University, Wageningen, The Netherlands
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Langmuir isotherms for enantioselective complexation of (d/l)-phenylalanine by cholesteryl-l-glutamate in nonionic micelles. Colloids Surf A Physicochem Eng Asp 2000. [DOI: 10.1016/s0927-7757(99)00308-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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25
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Allender CJ, Brain KR, Heard CM. 6 Molecularly Imprinted Polymers—Preparation, Biomedical Applications and Technical Challenges. PROGRESS IN MEDICINAL CHEMISTRY 1999. [DOI: 10.1016/s0079-6468(08)70049-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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