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Upmanis T, Sevostjanovs E, Kažoka H. Chiral recognition mechanism studies of Tyr-Arg-Phe-Lys-NH 2 tetrapeptide on crown ether-based chiral stationary phase. Chirality 2024; 36:e23619. [PMID: 37700546 DOI: 10.1002/chir.23619] [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: 06/29/2023] [Revised: 08/20/2023] [Accepted: 08/28/2023] [Indexed: 09/14/2023]
Abstract
Even though chiral recognition for crown-ether CSPs is generally understood, on a molecular level, exact mechanisms for the resolution are still unclear. Furthermore, short peptide analytes often contain multiple amino moieties capable of binding to the crown ether selector. In order to extend the understanding in chiral recognition mechanisms, polar organic mode separation of Tyr-Arg-Phe-Lys-NH2 tetrapeptide llll/dddd enantiomers on S- and R-(3,3'-diphenyl-1,1'-binaphthyl)-20-crown-6 stationary phases was studied with 50-mM perchloric acid in methanol as mobile phase. Deviation from the generally acceptable 1:1 stoichiometry was supported by mass spectroscopy analysis of the formed complexes between tetrapeptide enantiomer and crown ether selectors, which revealed adducts possessing 1:1, 1:2, and 1:3 stoichiometry. Further investigation of complexation induced shifts by NMR indicated on different binding mechanisms between llll/dddd enantiomers of Tyr-Arg-Phe-Lys-NH2 and crown ether selectors. Enantioselective proton shifts were observed in studied tetrapeptide tyrosine and phenylalanine residues exclusively for llll enantiomer upon binding with S-(3,3'-diphenyl-1,1'-binaphthyl)-20-crown-6 selector (and dddd enantiomer with R-(3,3'-diphenyl-1,1'-binaphthyl)-20-crown-6 selector), indicating that these two amino acid residues contribute to chiral recognition. The obtained results were in agreement with the LC data.
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Affiliation(s)
- Toms Upmanis
- Latvian Institute of Organic Synthesis, Riga, Latvia
| | | | - Helena Kažoka
- Latvian Institute of Organic Synthesis, Riga, Latvia
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2
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Qin S, You X, Guo X, Chu H, Dong Q, Cui H, Jin F, Gao L. A chiral fluorescent COF prepared by post-synthesis modification for optosensing of imazamox enantiomers. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 291:122370. [PMID: 36680831 DOI: 10.1016/j.saa.2023.122370] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 01/04/2023] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
We report a post-synthesis modification for the preparation of a novel chiral fluorescent covalent organic framework (COF) for selective recognization of imazamox enantiomers. In this study, chiral COF was firstly synthesized via a Schiff-base reaction between 2,5-dihydroxyterephthalaldehyde (Dha) and 1,3,5-tris(4-aminophenyl)benzene (Tab) followed by a nucleophilic substitution using (1S)-(+)-10-camphorsulfonyl chloride as chiral modifier. The resulting regular spherical chiral COF Dha Tab not only presented the high optical efficiency, strong covalent bond structure, good crystallinity, large specific surface area but also showed the specific enantioselectivity and quick identification for imazamox enantiomers among five pesticide enantiomers (S/R-imazamox, acephate, acetochlor, propisochlor and metalaxyl). The detection limits for S- and R-imazamox were 4.20 μmol/L and 3.03 μmol/L, respectively. Meanwhile, the enantiomeric excess value (5.30 %) manifested that the chiral COF Dha Tab had the strong adsorption ability to imazamox enantiomers and more higher affinity for R-imazamox. This chiral fluorescent COF opened up a new way for the recognition of enantiomers.
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Affiliation(s)
- Shili Qin
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China
| | - Xingyu You
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China
| | - Xinyu Guo
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China
| | - Hongtao Chu
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China
| | - Qing Dong
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China
| | - Hongshou Cui
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China
| | - Fenglong Jin
- Qiqihar Inspection and Testing Center, Qiqihar Administration for Market Regulation, China.
| | - Lidi Gao
- College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, PR China.
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3
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Recent advances in mass spectrometry studies of non-covalent complexes of macrocycles - A review. Anal Chim Acta 2019; 1081:32-50. [DOI: 10.1016/j.aca.2019.06.029] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 06/10/2019] [Accepted: 06/11/2019] [Indexed: 12/29/2022]
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4
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Wollschläger JM, Simon K, Gaedke M, Schalley CA. Ion mobility and gas phase H/D exchange: revealing the importance of a single hydrogen bond for the chiral recognition of crown ether ammonium complexes. Chem Commun (Camb) 2018; 54:4967-4970. [PMID: 29701736 DOI: 10.1039/c8cc01671b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Two new BINOL-based chiral crown ether/ammonium complexes are studied by travelling-wave ion-mobility spectrometry. Homo- and heterochiral crown ether/ammonium complexes differ in their collision cross sections, and these differences go along with changes in hydrogen bonding as revealed by gas phase H/D-exchange experiments. Applications for the determination of enantiomeric excess are discussed.
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Affiliation(s)
- Jan M Wollschläger
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany.
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5
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Avilés-Moreno JR, Berden G, Oomens J, Martínez-Haya B. Guanidinium/ammonium competition and proton transfer in the interaction of the amino acid arginine with the tetracarboxylic 18-crown-6 ionophore. Phys Chem Chem Phys 2018; 20:4067-4073. [DOI: 10.1039/c7cp07975c] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The binding of arginine by the 18-crown-6 tetracarboxylic ionophore relies on extensive host–guest redistribution of electronic charge and proton transfer.
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Affiliation(s)
- Juan Ramón Avilés-Moreno
- Department of Physical
- Chemical and Natural Systems
- Universidad Pablo de Olavide
- E-41013 Seville
- Spain
| | - Giel Berden
- Radboud University
- Institute for Molecules and Materials
- FELIX Laboratory
- Toernooiveld 7c
- The Netherlands
| | - Jos Oomens
- Radboud University
- Institute for Molecules and Materials
- FELIX Laboratory
- Toernooiveld 7c
- The Netherlands
| | - Bruno Martínez-Haya
- Department of Physical
- Chemical and Natural Systems
- Universidad Pablo de Olavide
- E-41013 Seville
- Spain
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6
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Yu X, Yao ZP. Chiral recognition and determination of enantiomeric excess by mass spectrometry: A review. Anal Chim Acta 2017; 968:1-20. [DOI: 10.1016/j.aca.2017.03.021] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 03/15/2017] [Accepted: 03/16/2017] [Indexed: 10/19/2022]
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7
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Avilés-Moreno JR, Berden G, Oomens J, Martínez-Haya B. Isolated complexes of the amino acid arginine with polyether and polyamine macrocycles, the role of proton transfer. Phys Chem Chem Phys 2017; 19:31345-31351. [DOI: 10.1039/c7cp04270a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Protonated arginine interacts with 12-crown-4 through the guanidinium side group. In the complex with the N-substituted analog cyclen, the dominant conformation is the result of the proton transfer from the carboxylic acid group of the amino acid to the macrocycle.
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Affiliation(s)
- Juan Ramón Avilés-Moreno
- Department of Physical
- Chemical and Natural Systems
- Universidad Pablo de Olavide
- E-41013 Seville
- Spain
| | - Giel Berden
- Radboud University
- Institute for Molecules and Materials
- FELIX Laboratory
- 6525ED Nijmegen
- The Netherlands
| | - Jos Oomens
- Radboud University
- Institute for Molecules and Materials
- FELIX Laboratory
- 6525ED Nijmegen
- The Netherlands
| | - Bruno Martínez-Haya
- Department of Physical
- Chemical and Natural Systems
- Universidad Pablo de Olavide
- E-41013 Seville
- Spain
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8
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Huang Q, Jiang L, Liang W, Gui J, Xu D, Wu W, Nakai Y, Nishijima M, Fukuhara G, Mori T, Inoue Y, Yang C. Inherently Chiral Azonia[6]helicene-Modified β-Cyclodextrin: Synthesis, Characterization, and Chirality Sensing of Underivatized Amino Acids in Water. J Org Chem 2016; 81:3430-4. [DOI: 10.1021/acs.joc.6b00130] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qinfei Huang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Liangwei Jiang
- Chongqing Municipal & Environmental Sanitation Monitoring Department, Yubei District, Chongqing, China
| | - Wenting Liang
- Institute
of Environmental Sciences, Shanxi University, Taiyuan 030006, China
| | - Jianchang Gui
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Dingguo Xu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | - Wanhua Wu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
| | | | | | | | | | | | - Cheng Yang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, China
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Hyun MH. Development of HPLC Chiral Stationary Phases Based on (+)-(18-Crown-6)-2,3,11,12-tetracarboxylic Acid and Their Applications. Chirality 2015; 27:576-88. [PMID: 26237013 DOI: 10.1002/chir.22484] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 06/08/2015] [Accepted: 06/08/2015] [Indexed: 11/05/2022]
Abstract
Crown ether-based chiral stationary phases (CSPs) have been known to be useful for the resolution of racemic primary amino compounds. In particular, CSPs based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid have been reported to be useful for the resolution of secondary amino compounds as well as primary amino compounds. In this article, the process of developing various CSPs based on (+)-(18-crown-6)-2,3,11,12-tetracarboxylic acid to improve the chiral recognition efficiency and/or the stability of the CSPs and their applications to the resolution of various primary and nonprimary amino compounds are reviewed.
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Affiliation(s)
- Myung Ho Hyun
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, Republic of Korea
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10
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Fujihara A, Maeda N, Hayakawa S. EnantioselectivePhotolysis and Quantitative Chiral Analysis of Tryptophan Complexed With Alkali-Metalized L-Serine in the Gas Phase. Chirality 2015; 27:349-52. [DOI: 10.1002/chir.22442] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Revised: 02/26/2015] [Accepted: 02/27/2015] [Indexed: 01/24/2023]
Affiliation(s)
- Akimasa Fujihara
- Department of Chemistry, Graduate School of Science; Osaka Prefecture University; Osaka Japan
| | - Naoto Maeda
- Department of Chemistry, Graduate School of Science; Osaka Prefecture University; Osaka Japan
| | - Shigeo Hayakawa
- Department of Chemistry, Graduate School of Science; Osaka Prefecture University; Osaka Japan
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11
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Fujihara A, Maeda N, Hayakawa S. Quantitative chiral analysis of tryptophan using enantiomer-selective photolysis of cold non-covalent complexes in the gas phase. JOURNAL OF MASS SPECTROMETRY : JMS 2015; 50:451-453. [PMID: 25800180 DOI: 10.1002/jms.3547] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 11/13/2014] [Accepted: 11/14/2014] [Indexed: 06/04/2023]
Affiliation(s)
- Akimasa Fujihara
- Department of Chemistry, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
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12
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Lariat ethers in the chiral recognition of amino acid esters:electrospray ionization mass spectrometry investigation. J INCL PHENOM MACRO 2014. [DOI: 10.1007/s10847-014-0430-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Avilés-Moreno JR, Quesada-Moreno MM, López-González JJ, Martínez-Haya B. Chiral Recognition of Amino Acid Enantiomers by a Crown Ether: Chiroptical IR-VCD Response and Computational Study. J Phys Chem B 2013; 117:9362-70. [DOI: 10.1021/jp405027s] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Juan Ramón Avilés-Moreno
- Department of Physical and Analytical
Chemistry, Campus Las Lagunillas, University of Jaén, E-23071 Jaén, Spain
| | - María Mar Quesada-Moreno
- Department of Physical and Analytical
Chemistry, Campus Las Lagunillas, University of Jaén, E-23071 Jaén, Spain
| | - Juan Jesús López-González
- Department of Physical and Analytical
Chemistry, Campus Las Lagunillas, University of Jaén, E-23071 Jaén, Spain
| | - Bruno Martínez-Haya
- Department of Physical, Chemical
and Natural Systems, Universidad Pablo de Olavide, E-41013 Seville, Spain
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14
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Lemaur V, Carroy G, Poussigue F, Chirot F, De Winter J, Isaacs L, Dugourd P, Cornil J, Gerbaux P. Homotropic Allosterism: In-Depth Structural Analysis of the Gas-Phase Noncovalent Complexes Associating a Double-Cavity Cucurbit[n]uril-Type Host and Size-Selected Protonated Amino Compounds. Chempluschem 2013; 78:959-969. [DOI: 10.1002/cplu.201300208] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Indexed: 11/09/2022]
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15
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Fraschetti C, Filippi A, Crestoni ME, Ema T, Speranza M. Unexpected behavior of diastereomeric ions in the GasPhase: a stimulus for pondering on ee measurements by ESI-MS. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:573-578. [PMID: 23494298 DOI: 10.1007/s13361-012-0575-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 12/21/2012] [Accepted: 12/21/2012] [Indexed: 06/01/2023]
Abstract
The most common protocols for the quantitative determination of the enantiomeric excess (ee) of raw mixtures by ESI-MS reveal inadequate in cases where the distribution of diastereomeric derivatives diverges from the ee of original solutions. This phenomenon is attributable to a matrix effect, i.e., to the stereospecific formation of high order noncovalent adducts in the ESI droplets, which alters the actual availability of the diastereomeric species under MS analysis. In this frame, the assumption of classic protocols that the ionization correction factor q is independent on the composition of the mixture submitted to analysis is questionable. An alternative methodology is presented in this paper, which is aimed at circumventing the problem by excluding any chemical derivatization of the original raw mixture. It is based on the measurement of the actual distribution of ESI-formed proton-bound diastereomeric complexes from the enantiomeric mixture through a careful analysis of their reaction kinetics with a suitable reactant.
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Affiliation(s)
- Caterina Fraschetti
- Dipartimento di Chimica e Tecnologie del Farmaco, Università La Sapienza, Rome, Italy
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Abstract
Capillary electrophoresis (CE) has matured to one of the major liquid phase enantiodifferentiation techniques since the first report in 1985. This can be primarily attributed to the flexibility as well as the various modes available including electrokinetic chromatography (EKC), micellar electrokinetic chromatography (MEKC), and microemulsion electrokinetic chromatography (MEEKC). In contrast to chromatographic techniques, the chiral selector is mobile in the background electrolyte. Furthermore, a large variety of chiral selectors are available that can be easily combined in the same separation system. In addition, the migration order of the enantiomers can be adjusted by a number of approaches. In CE enantiodifferentiations the separation principle is comparable to chromatography while the principle of the movement of the analytes in the capillary is based on electrophoretic phenomena. The present chapter will focus on mechanistic aspects of CE enantioseparations including enantiomer migration order and the current understanding of selector-selectand structures. Selected examples of the basic enantioseparation modes EKC, MEKC, and MEEKC will be discussed.
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Affiliation(s)
- Gerhard K E Scriba
- Department of Pharmaceutical/Medicinal Chemistry, Friedrich Schiller University Jena, Philosophenweg 14, 07743, Jena, Germany,
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Hayashi N, Jin S, Ujihara T. Removal of Acidic or Basic α-Amino Acids in Water by Poorly Water Soluble Scandium Complexes. J Org Chem 2012; 77:9652-8. [DOI: 10.1021/jo301739s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nobuyuki Hayashi
- National Food Research Institute, National Agriculture and Food Research Organization (NARO), 2-1-12
Kannondai, Tsukuba, Ibaraki 305-8642, Japan
| | - Shigeki Jin
- Faculty of Health
Science, Hokkaido University, Kita 12, Nishi 5, Kita-ku, Sapporo, Hokkaido 060-0812, Japan
| | - Tomomi Ujihara
- National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization (NARO), 2769 Kanaya, Shimada, Shizuoka 428-8501, Japan
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Xu K, Jiao S, Yao W, Xie E, Tang B, Wang C. Syntheses and Highly Enantioselective Fluorescent Recognition of α-Aminocarboxylic Acid Anions Using Chiral Oxacalix[2]arene[2]bisbinaphthes. Chirality 2012; 24:646-51. [DOI: 10.1002/chir.22059] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Revised: 02/13/2012] [Accepted: 02/28/2012] [Indexed: 12/30/2022]
Affiliation(s)
- Kuoxi Xu
- Institute of Fine Chemistry and Chemical Engineering, College of Chemistry and Chemical Engineering; Henan University; Kaifeng 475004 China
- Key Laboratory of Natural Medicinal and Immunal Engineering; Henan University; Kaifeng 475004 China
| | - Shuyan Jiao
- Institute of Fine Chemistry and Chemical Engineering, College of Chemistry and Chemical Engineering; Henan University; Kaifeng 475004 China
| | - Wenyong Yao
- Institute of Fine Chemistry and Chemical Engineering, College of Chemistry and Chemical Engineering; Henan University; Kaifeng 475004 China
| | - En Xie
- Institute of Fine Chemistry and Chemical Engineering, College of Chemistry and Chemical Engineering; Henan University; Kaifeng 475004 China
| | - Baowei Tang
- Institute of Fine Chemistry and Chemical Engineering, College of Chemistry and Chemical Engineering; Henan University; Kaifeng 475004 China
| | - Chaojie Wang
- Key Laboratory of Natural Medicinal and Immunal Engineering; Henan University; Kaifeng 475004 China
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Hurtado P, Gámez F, Hamad S, Martínez–Haya B, Steill JD, Oomens J. Multipodal coordination of a tetracarboxylic crown ether with NH 4+: A vibrational spectroscopy and computational study. J Chem Phys 2012; 136:114301. [DOI: 10.1063/1.3693518] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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21
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Zobnina VG, Kosevich MV, Chagovets VV, Boryak OA, Vékey K, Gömöry Á, Kulyk AN. Interactions of oligomers of organic polyethers with histidine amino acid. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:532-540. [PMID: 22302493 DOI: 10.1002/rcm.5342] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
RATIONALE Knowledge on noncovalent intermolecular interactions of organic polyethers with amino acids is essential to gain a better understanding on how polymers assemble in organic nanoparticles which are promising for drug delivery and cryoprotection. The main objective of the present study was to determine how polyethers assemble around ionizable amino acids such as histidine. METHODS Electrospray mass spectrometry was applied to probe the interactions in model systems consisting of polyethylene glycol PEG-400 or oxyethylated glycerol OEG-5 and amino acid histidine hydrochloride. Molecular dynamics simulation was utilized to visualize the structure of complexes of polyether oligomers with histidine in different charge states. RESULTS Stable gas-phase clusters composed of polyether oligomers (PEG(n), OEG(n)) with protonated histidine--PEG(n)•His•H(+), OEG(n)•His•H(+), OEG(n)•OEG(m)•His•H(+) and chlorine counterion--PEG(n)•Cl(-), OEG(n)•Cl(-), were observed under electrospray conditions. Molecular dynamics simulation of representative polyether-histidine complexes revealed the stabilization of oligomers by multiple hydrogen and coordination bonds whereby charged groups are wrapped by the polymeric chains. CONCLUSIONS The self-organization of polyether chains around the protonated imidazole group of histidine was revealed. This finding should be considered when modelling a pegylated protein structure and polyether-based organic nanoparticles.
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Affiliation(s)
- Valentina G Zobnina
- B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Lenin Avenue 47, Kharkov, 61103, Ukraine
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Zhu LH, Song LX, Yang J, Pan SZ, Yang J. Push–pull effect and synergistic discrimination of β-cyclodextrin and 18-crown-6. Supramol Chem 2011. [DOI: 10.1080/10610278.2011.581282] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Abstract
This perspective gives an introduction into the design of luminescent lanthanide(iii)-containing complexes possessing chiral properties and used to probe biological materials. The first part briefly describes general principles, focusing on the optical aspect (i.e. lanthanide luminescence, sensitization processes) of the most emissive trivalent lanthanide ions, europium and terbium, incorporated into molecular luminescent edifices. This is followed by a short discussion on the importance of chirality in the biological and pharmaceutical fields. The second part is devoted to the assessment of the chiroptical spectroscopic tools available (typically circular dichroism and circularly polarized luminescence) and the strategies used to introduce a chiral feature into luminescent lanthanide(iii) complexes (chiral structure resulting from a chiral arrangement of the ligand molecules surrounding the luminescent center or presence of chiral centers in the ligand molecules). Finally, the last part illustrates these fundamental principles with recent selected examples of such chiral luminescent lanthanide-based compounds used as potential probes of biomolecular substrates.
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Affiliation(s)
- Gilles Muller
- Department of Chemistry, San José State University, San José, CA 95192-0101, USA.
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