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Kobidze G, Sprega G, Daziani G, Balloni A, Lo Faro AF, Farkas T, Peluso P, Basile G, Busardò FP, Chankvetadze B. Separation of undeuterated and partially deuterated enantioisotopologues of some amphetamine derivatives on achiral and polysaccharide-based chiral columns in high-performance liquid chromatography. J Chromatogr A 2024; 1718:464709. [PMID: 38350352 DOI: 10.1016/j.chroma.2024.464709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 01/29/2024] [Accepted: 02/01/2024] [Indexed: 02/15/2024]
Abstract
The different behavior of enantiomers of chiral compounds in non-isotropic environments (among them in living organism) is well known. On the other hand, the importance of a kinetic isotope effect in the biomedical field has become evident during past few decades. Thus, separation of both, enantiomers and isotopologues is now critical. Only very few published studies have attempted the simultaneous separation of enantioisotopologues. In this article we report baseline separation of partially deuterated isotopologues of a few amphetamine derivatives in high-performance liquid chromatography (HPLC) using achiral columns. In addition, the simultaneous separations of enantiomers and isotopologues (i.e. enantioisotopologues) were attempted on polysaccharide-based chiral columns. For several compounds the isotope effect was tunable and could be switched from a "normal" to "inverse" by making changes to the mobile-phase composition. A stronger isotope effect was observed in acetonitrile-containing mobile phases compared to methanol-containing ones with both chiral and achiral columns. In a separation system where both "normal" and "inverse" isotope effects were observed the "normal" isotope effect was favored in polar organic solvents while increasing content of the aqueous component in the reversed-phase (RP) mobile phase favored an "inverse" isotope effect. This observation indicates that polar, hydrogen bonding-type noncovalent interactions are involved in the "normal" isotope effect, while apolar hydrophobic-type interactions are mostly responsible for the "inverse" isotope effect.
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Affiliation(s)
- Giorgi Kobidze
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, 60121 Ancona, Italy
| | - Giorgia Sprega
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, 60121 Ancona, Italy
| | - Gloria Daziani
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, 60121 Ancona, Italy
| | - Aurora Balloni
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, 60121 Ancona, Italy
| | - Alfredo Fabrizio Lo Faro
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, 60121 Ancona, Italy
| | - Tivadar Farkas
- Phenomenex Inc., 411 Madrid Ave., Torrance, 90501 CA, USA
| | - Paola Peluso
- Istituto di Chimica Biomolecolare ICB-CNR, Sede secondaria di Sassari, Traversa La Crucca 3, Regione Baldinca, Li Punti, 07100 Sassari, Italy
| | - Giuseppe Basile
- Department of Trauma Surgery, IRCCS Galeazzi Orthopedic Institute, Via Riccardo Galeazzi 4, 20161 Milan, Italy
| | - Francesco Paolo Busardò
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, 60121 Ancona, Italy.
| | - Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, 0179 Tbilisi, Georgia.
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Horváth S, Nguyen Thuy HH, Eke Z, Németh G. Exploitation of the enantioselectivity space of coated amylose tris(3,5-dimethylphenylcarbamate) in mixtures of 2-propanol and acetonitrile. J Chromatogr A 2023; 1705:464161. [PMID: 37352691 DOI: 10.1016/j.chroma.2023.464161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/11/2023] [Accepted: 06/13/2023] [Indexed: 06/25/2023]
Abstract
Chiral stationary phases (CSPs) with coated amylose tris(3,5-dimethylphenylcarbamate) (ADMPC) selector have long been recognized for their excellent chiral recognition ability in liquid chromatography. The conformational versatility behind this feature is the source of their known hysteretic behavior, which has been previously observed in polar organic (PO) mode eluents containing 2-propanol (IPA). Mixtures of IPA and acetonitrile (MeCN), a typical PO mode eluent system, have not been examined in this aspect yet, even though hysteresis is promising for finding unique unexplored enantioselectivities. Not only was the hysteresis detectable on ADMPC using mixtures of IPA and MeCN, but it was the typical behavior in a diverse set of test compounds. The difference in the retention time of the same analyte under conditions which only differed in the eluent history on the column can go up to 20-fold. The assumed hindered conformational changes of the selector were reflected in retention drift at certain eluent compositions. On the two sides of the transitions, distinct, useful states of the selector were detected. A series of IPA - MeCN compositions with defined pretreatment was selected and recommended as an extension of the preliminary, first choice method screening set that used only alcohols. The incorporation of a solvent possessing substantially different characteristics enhances the potential in practical applications, while keeping the technical simplicity. Stability and robustness of the additional states of the CSP were characterized. The examined columns of different brands shared the observed behavior. Kinetic stability of a column state is adequate for successful application. The evaluated states of ADMPC provide multiple enantiorecognition potential by using mixtures of IPA and MeCN also considering the pretreatment of the column. Unprecedented double and triple elution order reversals along the composition range supported the versatility of the available states. Our findings further enhance the usefulness of ADMPC-containing CSPs. We provide instructions for the application of the widespread chiral selector in common eluent mixtures to avoid pitfalls regarding reproducibility and robustness.
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Affiliation(s)
- Simon Horváth
- Drug Substance Development Division, Egis Pharmaceuticals PLC, P.O. Box 100, Budapest H-1475, Hungary.
| | - Hong Ha Nguyen Thuy
- Drug Substance Development Division, Egis Pharmaceuticals PLC, P.O. Box 100, Budapest H-1475, Hungary
| | - Zsuzsanna Eke
- Joint Research and Training Laboratory on Separation Science, Eötvös Loránd University, Pázmány Péter stny. 1/A, Budapest H-1117, Hungary
| | - Gábor Németh
- Drug Substance Development Division, Egis Pharmaceuticals PLC, P.O. Box 100, Budapest H-1475, Hungary.
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3
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Tsui HW, Hsieh CH, Zhan CF. Effect of mobile-phase modifiers on the enantioselective retention behavior of methyl mandelate with an amylose 3,5-dimethylphenylcarbamate chiral stationary phase under reversed-phase conditions. J Sep Sci 2023; 46:e2200651. [PMID: 36401614 DOI: 10.1002/jssc.202200651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 11/21/2022]
Abstract
In this study, methanol, ethanol, n-propyl alcohol, isopropyl alcohol, acetone, and tert-butanol were used as organic modifiers in reversed-phase mode chiral liquid-chromatography to systematically investigate the effects of mobile phase components on the enantioselective retention behavior of methyl mandelate with immobilized amylose 3,5-dimethylphenylcarbamate-based sorbent called Chiralpak IA. A two-site enantioselective model was used to obtain information on the recognition mechanisms by observing the dependence of the enantioselectivity and retention factor difference on the modifier content. Similar enantioselective retention behaviors were observed for all modifiers, and characteristic modifier concentration points (PL , PM , and PH ) were identified. At modifier concentrations up to PM , the weakened hydrophobic environment resulted in polymer structural relaxation, which changed the recognition mechanisms. By contrast, at concentrations beyond PH , considerably different enantioselectivity behaviors were observed, indicating that the existence of dipole-dipole interaction, which was stronger at higher modifier concentrations, contributed to the retention mechanisms. The concentrations at which these characteristic points occurred were dependent on the carbon number of the modifier molecule. Modifiers with more carbon numbers facilitated the transition in the enantioselective behaviors. These results demonstrated that the proposed method can provide a physically consistent quantitative description of enantioselective retention behavior in reversed-phase mode.
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Affiliation(s)
- Hung-Wei Tsui
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
| | - Ching-Hung Hsieh
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
| | - Chao-Fu Zhan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan
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4
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Peluso P, Chankvetadze B. Recognition in the Domain of Molecular Chirality: From Noncovalent Interactions to Separation of Enantiomers. Chem Rev 2022; 122:13235-13400. [PMID: 35917234 DOI: 10.1021/acs.chemrev.1c00846] [Citation(s) in RCA: 53] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
It is not a coincidence that both chirality and noncovalent interactions are ubiquitous in nature and synthetic molecular systems. Noncovalent interactivity between chiral molecules underlies enantioselective recognition as a fundamental phenomenon regulating life and human activities. Thus, noncovalent interactions represent the narrative thread of a fascinating story which goes across several disciplines of medical, chemical, physical, biological, and other natural sciences. This review has been conceived with the awareness that a modern attitude toward molecular chirality and its consequences needs to be founded on multidisciplinary approaches to disclose the molecular basis of essential enantioselective phenomena in the domain of chemical, physical, and life sciences. With the primary aim of discussing this topic in an integrated way, a comprehensive pool of rational and systematic multidisciplinary information is provided, which concerns the fundamentals of chirality, a description of noncovalent interactions, and their implications in enantioselective processes occurring in different contexts. A specific focus is devoted to enantioselection in chromatography and electromigration techniques because of their unique feature as "multistep" processes. A second motivation for writing this review is to make a clear statement about the state of the art, the tools we have at our disposal, and what is still missing to fully understand the mechanisms underlying enantioselective recognition.
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Affiliation(s)
- Paola Peluso
- Istituto di Chimica Biomolecolare ICB, CNR, Sede secondaria di Sassari, Traversa La Crucca 3, Regione Baldinca, Li Punti, I-07100 Sassari, Italy
| | - Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Chavchavadze Avenue 3, 0179 Tbilisi, Georgia
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Cantatore C, Visconti P, Pierini M, Cirilli R. Kinetic and mechanism study of the spontaneous, solvent- and base-catalyzed degradation of the precursor of the β-nitro alcohol metaraminol by combining HPLC/electronic circular dichroism/theoretical methods. J Pharm Biomed Anal 2022; 220:114972. [DOI: 10.1016/j.jpba.2022.114972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/26/2022] [Accepted: 07/26/2022] [Indexed: 11/17/2022]
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6
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Comparative study on retention behaviour and enantioresolution of basic and neutral structurally unrelated compounds with cellulose-based chiral stationary phases in reversed phase liquid chromatography-mass spectrometry conditions. J Chromatogr A 2022; 1673:463073. [DOI: 10.1016/j.chroma.2022.463073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 04/12/2022] [Accepted: 04/15/2022] [Indexed: 11/21/2022]
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7
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Chankvetadze B. Our research cooperation with Professor Yoshio Okamoto. Chirality 2022; 34:630-645. [PMID: 35048410 DOI: 10.1002/chir.23418] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/05/2022] [Accepted: 01/06/2022] [Indexed: 12/13/2022]
Abstract
This article summarizes our cooperation with the research group of Prof. Yoshio Okamoto at Nagoya University during the period of time between 1992 and 2005. Although the text deals entirely with enantioseparations in high-performance liquid chromatography, capillary electrophoresis, and capillary electrochromatography, this is not a detailed review in any of these areas. The text highlights selected aspects of these techniques, which have been the subject of our joint research and in part their reflection in follow-up research by our and other research groups. Together with more systematically studied topics, aspects such as ultrafast separation of enantiomers, uncommonly high separation factor of enantiomers and other related issues are also addressed.
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Affiliation(s)
- Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
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8
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Tsui HW, Zhang HL, Hsieh CH. Effect of 2-propanol content on solute retention mechanisms determined using amylose tris(3,5-dimethylphenylcarbamate) chiral stationary phase under normal- and reversed-phase conditions. J Chromatogr A 2021; 1650:462226. [PMID: 34087518 DOI: 10.1016/j.chroma.2021.462226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/12/2021] [Accepted: 04/29/2021] [Indexed: 11/29/2022]
Abstract
The electrostatic interactions between chiral solutes and polysaccharide (PS)-based chiral selectors are the key to achieving chiral recognition; however, PS-based sorbents, derivatized of phenyl moieties, can exhibit considerably non-polar characteristics, and they are also useful for the separation of enantiomers in the reversed-phase mode. In this study, an immobilized amylose 3,5-dimethylphenylcarbamate-based sorbent was used to investigate the balance between electrostatic interactions and solvophobic interactions, with complementary effects on solute retention behavior when the isopropanol (IPA) concentration was altered. It was proposed that in both normal- and reversed-phase modes, information on the retention mechanisms could be obtained by observing the curvature of the logarithm of the retention factor versus the logarithm of the IPA concentration, and the slope values of the curves were related to the number of displaced IPA molecules upon solute adsorption. Using the proposed model and the two-site adsorption model, the retention behaviors of pantolactone (PL) enantiomers in both normal- and reversed-phase modes were investigated. The PL-sorbent interactions were classified into four types: electrostatic/enantioselective, electrostatic/nonselective, solvophobic/enantioselective, and solvophobic/nonselective. At IPA concentrations below 50 vol.% in n-hexane, the retention behaviors of PL were dominated by electrostatic/enantioselective sites, whereas at IPA concentrations beyond 50 vol.%, the solvophobic interactions of PL-sorbent were strengthened and mostly nonselective. By contrast, in the reversed-phase mode, a reverse in the enantiomeric elution order of PL was observed at 10 vol.% IPA, and considerably different enantioselectivity behaviors were found below and above 20 vol.%, indicating an abrupt change in the sorbent molecular environment. At IPA concentrations beyond 40 vol.%, the presence of PL-sorbent electrostatic interactions enhanced chiral recognition.
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Affiliation(s)
- Hung-Wei Tsui
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608 Taiwan.
| | - Hong-Lin Zhang
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608 Taiwan
| | - Ching-Hung Hsieh
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 1, Sec. 3, Zhongxiao E. Rd., Taipei 10608 Taiwan
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Li M, Guo X, Di X, Jiang Z. Enantioseparation on a new synthetic β-cyclodextrin chemically bonded chiral stationary phase and molecular docking study. Anal Bioanal Chem 2021; 413:3933-3944. [PMID: 33903946 DOI: 10.1007/s00216-021-03344-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/22/2021] [Accepted: 04/13/2021] [Indexed: 01/07/2023]
Abstract
A novel β-cyclodextrin derivative chemically bonded chiral stationary phase (EDACD) was synthesized by the reaction of mono-6-ethylenediamine-β-cyclodextrin with the active alkyl isocyanate, anchoring to silica gel. After the successful analysis and characterization using scanning electron microscopy, Fourier transform infrared spectra, solid-state nuclear magnetic resonance spectra, elemental analysis, and thermogravimetric analysis techniques, the enantioselective performance of the as-prepared EDACD column was evaluated by non-steroidal antiinflammatory drugs and flavonoids under the reversed-phase HPLC condition. The factors that affected enantioseparation including mobile phase compositions and buffers were investigated in more detail. As a result, EDACD showed a satisfactory enantioselectivity for the tested drugs. With the mobile phase of acetonitrile and 20-mM ammonium formate adjusted to pH 4.0 using formic acid (85:15, v/v) at the flow rate of 0.6 mL min-1, the enantiomers of ibuprofen, carprofen, naproxen, indoprofen, ketoprofen, eriocitrin, naringin, and narirutin were separated with the best resolutions of 1.53, 1.64, 3.72, 2.40, 0.50, 0.61, 0.58, and 0.52. To adjust the proportion of acetonitrile to 80% (by volume), the enantiomers of pranoprofen and flurbiprofen were completely resolved with the best resolutions of 1.60 and 1.59. Additionally, by the study of the molecular docking, hydrogen bonding and inclusion complexation were believed to play an important role in chiral recognition. As a new material, EDACD will have a wider application in the analysis of chiral compounds.
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Affiliation(s)
- Meng Li
- School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang, 110016, Liaoning, China
| | - Xingjie Guo
- School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang, 110016, Liaoning, China
| | - Xin Di
- School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang, 110016, Liaoning, China.
| | - Zhen Jiang
- School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang, 110016, Liaoning, China.
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Florio R, Carradori S, Veschi S, Brocco D, Di Genni T, Cirilli R, Casulli A, Cama A, De Lellis L. Screening of Benzimidazole-Based Anthelmintics and Their Enantiomers as Repurposed Drug Candidates in Cancer Therapy. Pharmaceuticals (Basel) 2021; 14:ph14040372. [PMID: 33920661 PMCID: PMC8072969 DOI: 10.3390/ph14040372] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 04/10/2021] [Accepted: 04/15/2021] [Indexed: 12/21/2022] Open
Abstract
Repurposing of approved non-antitumor drugs represents a promising and affordable strategy that may help to increase the repertoire of effective anticancer drugs. Benzimidazole-based anthelmintics are antiparasitic drugs commonly employed both in human and veterinary medicine. Benzimidazole compounds are being considered for drug repurposing due to antitumor activities displayed by some members of the family. In this study, we explored the effects of a large series of benzimidazole-based anthelmintics (and some enantiomerically pure forms of those containing a stereogenic center) on the viability of different tumor cell lines derived from paraganglioma, pancreatic and colorectal cancer. Flubendazole, parbendazole, oxibendazole, mebendazole, albendazole and fenbendazole showed the most consistent antiproliferative effects, displaying IC50 values in the low micromolar range, or even in the nanomolar range. In silico evaluation of their physicochemical, pharmacokinetics and medicinal chemistry properties also provided useful information related to the chemical structures and potential of these compounds. Furthermore, in view of the potential repurposing of these drugs in cancer therapy and considering that pharmaceutically active compounds may have different mechanisms of action, we performed an in silico target prediction to assess the polypharmacology of these benzimidazoles, which highlighted previously unknown cancer-relevant molecular targets.
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Affiliation(s)
- Rosalba Florio
- Department of Pharmacy, G. d’Annunzio University of Chieti-Pescara, 66100 Chieti, Italy; (R.F.); (S.V.); (D.B.); (T.D.G.); (L.D.L.)
| | - Simone Carradori
- Department of Pharmacy, G. d’Annunzio University of Chieti-Pescara, 66100 Chieti, Italy; (R.F.); (S.V.); (D.B.); (T.D.G.); (L.D.L.)
- Correspondence: (S.C.); (A.C.)
| | - Serena Veschi
- Department of Pharmacy, G. d’Annunzio University of Chieti-Pescara, 66100 Chieti, Italy; (R.F.); (S.V.); (D.B.); (T.D.G.); (L.D.L.)
| | - Davide Brocco
- Department of Pharmacy, G. d’Annunzio University of Chieti-Pescara, 66100 Chieti, Italy; (R.F.); (S.V.); (D.B.); (T.D.G.); (L.D.L.)
| | - Teresa Di Genni
- Department of Pharmacy, G. d’Annunzio University of Chieti-Pescara, 66100 Chieti, Italy; (R.F.); (S.V.); (D.B.); (T.D.G.); (L.D.L.)
| | - Roberto Cirilli
- Centro Nazionale per il Controllo e la Valutazione dei Farmaci, Istituto Superiore di Sanità, 00161 Rome, Italy;
| | - Adriano Casulli
- WHO Collaborating Centre for the Epidemiology, Detection and Control of Cystic and Alveolar Echinococcosis (in Animals and Humans), Department of Infectious Diseases, Istituto Superiore di Sanità, 00161 Rome, Italy;
- European Union Reference Laboratory for Parasites, Department of Infectious Diseases, Istituto Superiore di Sanità, 00161 Rome, Italy
| | - Alessandro Cama
- Department of Pharmacy, G. d’Annunzio University of Chieti-Pescara, 66100 Chieti, Italy; (R.F.); (S.V.); (D.B.); (T.D.G.); (L.D.L.)
- Center for Advanced Studies and Technology, University “G. d’Annunzio” of Chieti-Pescara, 66100 Chieti, Italy
- Correspondence: (S.C.); (A.C.)
| | - Laura De Lellis
- Department of Pharmacy, G. d’Annunzio University of Chieti-Pescara, 66100 Chieti, Italy; (R.F.); (S.V.); (D.B.); (T.D.G.); (L.D.L.)
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11
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The molecular bases of chiral recognition in 2-(benzylsulfinyl)benzamide enantioseparation. Anal Chim Acta 2021; 1141:194-205. [DOI: 10.1016/j.aca.2020.10.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 10/19/2020] [Accepted: 10/23/2020] [Indexed: 12/13/2022]
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12
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Direct HPLC enantioseparation of chemopreventive chiral isothiocyanates sulforaphane and iberin on immobilized amylose-based chiral stationary phases under normal-phase, polar organic and aqueous conditions. Talanta 2020; 218:121151. [DOI: 10.1016/j.talanta.2020.121151] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 05/06/2020] [Accepted: 05/09/2020] [Indexed: 12/13/2022]
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13
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Dogan A, Eylem CC, Akduman NEB. Application of green methodology to pharmaceutical analysis using eco-friendly ethanol-water mobile phases. Microchem J 2020. [DOI: 10.1016/j.microc.2020.104895] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Tóth G, Fogarasi E, Bartalis-Fábián Á, Foroughbakhshfasaei M, Boldizsár I, Darcsi A, Lohner S, Scriba GK, Szabó ZI. Liquid chromatographic method for the simultaneous determination of achiral and chiral impurities of dapoxetine in approved and counterfeit products. J Chromatogr A 2020; 1626:461388. [DOI: 10.1016/j.chroma.2020.461388] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 06/30/2020] [Accepted: 07/03/2020] [Indexed: 02/07/2023]
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15
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Separation of enantiomers of chiral basic drugs with amylose- and cellulose- phenylcarbamate-based chiral columns in acetonitrile and aqueous-acetonitrile in high-performance liquid chromatography with a focus on substituent electron-donor and electron-acceptor effects. J Chromatogr A 2020; 1624:461218. [DOI: 10.1016/j.chroma.2020.461218] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 05/04/2020] [Accepted: 05/06/2020] [Indexed: 11/20/2022]
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16
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Noncovalent interactions in high-performance liquid chromatography enantioseparations on polysaccharide-based chiral selectors. J Chromatogr A 2020; 1623:461202. [DOI: 10.1016/j.chroma.2020.461202] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/02/2020] [Accepted: 05/04/2020] [Indexed: 12/13/2022]
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17
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Chankvetadze B. Recent trends in preparation, investigation and application of polysaccharide-based chiral stationary phases for separation of enantiomers in high-performance liquid chromatography. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2019.115709] [Citation(s) in RCA: 96] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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18
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Tsui HW, Kuo CH, Huang YC. Elucidation of retention behaviors in reversed-phase liquid chromatography as a function of mobile phase composition. J Chromatogr A 2019; 1595:127-135. [DOI: 10.1016/j.chroma.2019.02.049] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 02/18/2019] [Accepted: 02/22/2019] [Indexed: 10/27/2022]
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Cirilli R. HPLC Enantioseparations with Polysaccharide-Based Chiral Stationary Phases in HILIC Conditions. Methods Mol Biol 2019; 1985:127-146. [PMID: 31069732 DOI: 10.1007/978-1-4939-9438-0_7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In contrast to achiral hydrophilic interaction liquid chromatography (HILIC), which is a popular and largely applied technique to analyze polar compounds such as pharmaceuticals, metabolites, proteins, peptides, amino acids, oligonucleotides, and carbohydrates, the introduction of the HILIC concept in enantioselective chromatography has been relatively recent and scarcely debated. In this chapter, the HILIC enantioseparations carried out on polysaccharide-based chiral stationary phases are grouped and discussed. Another objective of this chapter is to provide a comprehensive overview and insight into the experimental conditions needed to operate under HILIC mode. Finally, to stimulate and facilitate the application of this chromatographic technique, a detailed experimental protocol of a chiral resolution on a chlorinated cellulose-based chiral stationary phase under HILIC conditions is described.
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Affiliation(s)
- Roberto Cirilli
- National Institute of Health, Centre for the Control and Evaluation of Medicines, Rome, Italy.
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Cirilli R, Carradori S, Casulli A, Pierini M. A chromatographic study on the retention behavior of the amylose tris(3-chloro-5-methylphenylcarbamate) chiral stationary phase under aqueous conditions. J Sep Sci 2018; 41:4014-4021. [PMID: 30194899 DOI: 10.1002/jssc.201800696] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 08/28/2018] [Accepted: 08/29/2018] [Indexed: 01/02/2023]
Abstract
In this study, the retention properties of the immobilized polysaccharide-derived Chiralpak IG-3 chiral stationary phase under aqueous-organic conditions were investigated. A systematic evaluation of the retention factors of the enantiomers of the chiral sulfoxide oxfendazole, endowed with anthelmintic activity and selected as test compound, was carried out changing progressively the water content in hydro-organic eluents containing methanol, ethanol or acetonitrile. From the results obtained with acetonitrile/water mobile phases and the associated retention plots, clear U-shape retention dependencies, indicative of the interplay of both hydrophilic interaction liquid chromatography and reversed-phase modes, were highlighted. A U-turn point of retention mechanism was recorded in correspondence of the acetonitrile/water 100:40 v/v mobile phase. Retention was significantly affected by small percentages of trifluoroacetic acid or diethylamine additives incorporated in the mobile phase. It is worth emphasizing that the basic additive was more effective in reducing retention in the reversed-phase region, while the action of acid additive was more pronounced in the hydrophilic interaction liquid chromatography region. Finally, either in the transition from hydrophilic interaction liquid chromatography to reversed-phase conditions or after additive addition, the enantioselectivity did not vary significantly.
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Affiliation(s)
- Roberto Cirilli
- Centro nazionale per il controllo e la valutazione dei farmaci, Istituto Superiore di Sanità, Rome, Italy
| | - Simone Carradori
- Dipartimento di Farmacia, Università "G. D'Annunzio" di Chieti-Pescara, Chieti, Italy
| | - Adriano Casulli
- European Union Reference Laboratory for Parasites, Department of infectious diseases, Istituto Superiore di Sanità, Rome, Italy.,World Health Organization Collaborating Centre for the epidemiology, detection and control of cystic and alveolar echinococcosis, Istituto Superiore di Sanità, Rome, Italy
| | - Marco Pierini
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, Rome, Italy
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21
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Padró JM, Keunchkarian S. State-of-the-art and recent developments of immobilized polysaccharide-based chiral stationary phases for enantioseparations by high-performance liquid chromatography (2013–2017). Microchem J 2018. [DOI: 10.1016/j.microc.2018.04.017] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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22
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Li M, Zhang B, Yu J, Wang J, Guo X. Enantiomeric separation and simulation study of eight anticholinergic drugs on an immobilized polysaccharide-based chiral stationary phase by HPLC. NEW J CHEM 2018. [DOI: 10.1039/c8nj00685g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Enantiomeric separation process of anticholinergic drugs and chiral recognition mechanisms on Chiralpak ID column.
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Affiliation(s)
- Meng Li
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- P. R. China
| | - Bo Zhang
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- P. R. China
| | - Jia Yu
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- P. R. China
| | - Jian Wang
- School of Pharmaceutical Engineering
- Shenyang Pharmaceutical University
- Shenyang
- P. R. China
| | - Xingjie Guo
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- P. R. China
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23
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West C, Konjaria ML, Shashviashvili N, Lemasson E, Bonnet P, Kakava R, Volonterio A, Chankvetadze B. Enantioseparation of novel chiral sulfoxides on chlorinated polysaccharide stationary phases in supercritical fluid chromatography. J Chromatogr A 2017; 1499:174-182. [PMID: 28404372 DOI: 10.1016/j.chroma.2017.03.089] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/27/2017] [Accepted: 03/28/2017] [Indexed: 11/28/2022]
Abstract
Asymmetric sulfoxides is a particular case of chirality that may be found in natural as well as synthetic products. Twenty-four original molecules containing a sulfur atom as a centre of chirality were analyzed in supercritical fluid chromatography on seven polysaccharide-based chiral stationary phases (CSP) with carbon dioxide - methanol mobile phases. While all the tested CSP provided enantioseparation for a large part of the racemates, chlorinated cellulosic phases proved to be both highly retentive and highly enantioselective towards these species. Favourable structural features were determined by careful comparison of the enantioseparation of the probe molecules. Molecular modelling studies indicate that U-shaped (folded) conformations were most favorable to achieve high enantioresolution on these CSP, while linear (extended) conformations were not so clearly discriminated. For a subset of these species adopting different conformations, a broad range of mobile phase compositions, ranging from 20 to 100% methanol in carbon dioxide, were investigated. While retention decreased continuously in this range, enantioseparation varied in a non-monotonous fashion. Abrupt changes in the tendency curves of retention and selectivity were observed when methanol proportion reaches about 60%, suggesting that a change in the conformation of the analytes and/or chiral selector is occurring at this point.
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Affiliation(s)
- Caroline West
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France.
| | - Mari-Luiza Konjaria
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
| | - Natia Shashviashvili
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
| | - Elise Lemasson
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France
| | - Pascal Bonnet
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France
| | - Rusudan Kakava
- Institut de Chimie Organique et Analytique (ICOA), Université d'Orléans et CNRS, UMR7311, BP 6759, 45067 Orléans, France
| | - Alessandro Volonterio
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Via Mancinelli 7, 20131, Milan, Italy; CNR Istituto di Chimica del Riconoscimento Moleculare (ICRM), Via Mancinelli 7, 20131 Milan, Italy
| | - Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi, Georgia
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Ferretti R, Carradori S, Guglielmi P, Pierini M, Casulli A, Cirilli R. Enantiomers of triclabendazole sulfoxide: Analytical and semipreparative HPLC separation, absolute configuration assignment, and transformation into sodium salt. J Pharm Biomed Anal 2017; 140:38-44. [PMID: 28340473 DOI: 10.1016/j.jpba.2017.03.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 03/10/2017] [Accepted: 03/11/2017] [Indexed: 11/17/2022]
Abstract
Direct HPLC separation of the enantiomers of triclabendazole sulfoxide (TCBZ-SO), which is the main metabolite of the anthelmintic drug triclabendazole, was carried out using the polysaccharide-based Chiralpak AS-H and Chiralpak IF-3 chiral stationary phases (CSPs). The chromatographic behaviour of both CSPs was evaluated and compared using normal-phase and reversed-phase eluents at different column temperatures. The eluent mixture of n-hexane-2-propanol-trifluoroacetic acid 70:30:0.1 (v/v/v) and a column temperature of 40°C were identified as the best operational conditions to carry out semipreparative enantioseparations on a 1-cm I.D. AS-H column. Under these conditions, 12.5mg of racemic sample were resolved in a single chromatographic run within 15min. Comparison of calculated and experimental chiroptical properties provided the absolute configuration assignment at the sulfur atom. The salification of the isolated enantiomers of TCBZ-SO by reaction with sodium hydroxide solution produced water-soluble Na salts which are potentially useful in the development of new anthelmintic enantiomerically pure formulations.
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Affiliation(s)
- Rosella Ferretti
- Centro nazionale per il controllo e la valutazione dei farmaci, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy
| | - Simone Carradori
- Dipartimento di Farmacia, Università "G. D'Annunzio" di Chieti-Pescara, Via dei Vestini 31, 66100 Chieti, Italy
| | - Paolo Guglielmi
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, P.le A. Moro 5, 00185 Rome, Italy
| | - Marco Pierini
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, P.le A. Moro 5, 00185 Rome, Italy
| | - Adriano Casulli
- Dipartimento di Malattie Infettive, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy; World Health Organization Collaborating Centre for the Epidemiology, Detection and Control of Cystic and Alveolar Echinococcosis (in Animals and Humans), Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy
| | - Roberto Cirilli
- Centro nazionale per il controllo e la valutazione dei farmaci, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy.
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25
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Cirilli R, Guglielmi P, Formica FR, Casulli A, Carradori S. The sodium salt of the enantiomers of ricobendazole: Preparation, solubility and chiroptical properties. J Pharm Biomed Anal 2017; 139:1-7. [PMID: 28258982 DOI: 10.1016/j.jpba.2017.01.057] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/26/2017] [Accepted: 01/30/2017] [Indexed: 11/26/2022]
Abstract
Albendazole (ABZ) is a sulfanyl-benzimidazole anthelmintic drug used worldwide in the treatment and prevention of parasitic diseases in animals and humans. Following oral administration, ABZ is rapidly oxidized into the pharmacologically active chiral sulfoxide metabolite known as ricobendazole (RBZ). As its achiral precursor, RBZ shows very low intestinal absorption due to its poor solubility in water (0.06mgmL-1). To the best of our knowledge, there is no known example in human medicine of a water-soluble salt form of racemic or enantiomerically pure RBZ. In the present study, we describe in detail the preparation of the sodium (Na) salt of the enantiomers of RBZ through a two-step process: i) the multi-milligram resolution of RBZ by HPLC on the amylose-based Chiralpak IG chiral stationary phase under polar organic mode; ii) the salification of the isolated enantiomers of RBZ by reaction with sodium hydroxide solution. The spectroscopic and chiroptical properties of the RBZ-Na enantiomers were determined. Due to their unique solubility in 0.01M phosphate buffer at physiological pH (14.49mgmL-1) and the high sample throughput obtained on semipreparative separation of the non-salified form, it is potentially possible to develop new anthelmintic enantiopure formulations with improved pharmacokinetic properties and lower toxicity.
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Affiliation(s)
- Roberto Cirilli
- Centro nazionale per il controllo e la valutazione dei farmaci, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy.
| | - Paolo Guglielmi
- Dipartimento di Chimica e Tecnologie del Farmaco, "Sapienza" Università di Roma, P.le A. Moro 5, 00185 Rome, Italy
| | - Francesca Romana Formica
- Centro nazionale per il controllo e la valutazione dei farmaci, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy
| | - Adriano Casulli
- Dipartimento di Malattie Infettive, Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy; World Health Organization Collaborating Centre for the Epidemiology, Detection and Control of Cystic and Alveolar Echinococcosis (in Animals and Humans), Istituto Superiore di Sanità, Viale Regina Elena 299, I-00161 Rome, Italy
| | - Simone Carradori
- Dipartimento di Farmacia, Università "G. D'Annunzio" di Chieti-Pescara, Via dei Vestini 31, 66100 Chieti, Italy
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26
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Separation of enantiomers of chiral weak acids with polysaccharide-based chiral columns and aqueous-organic mobile phases in high-performance liquid chromatography: Typical reversed-phase behavior? J Chromatogr A 2017; 1483:86-92. [DOI: 10.1016/j.chroma.2016.12.064] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 12/19/2016] [Accepted: 12/21/2016] [Indexed: 11/22/2022]
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27
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Ferretti R, Zanitti L, Casulli A, Cirilli R. Green high-performance liquid chromatography enantioseparation of lansoprazole using a cellulose-based chiral stationary phase under ethanol/water mode. J Sep Sci 2016; 39:1418-24. [DOI: 10.1002/jssc.201501329] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 02/04/2016] [Accepted: 02/04/2016] [Indexed: 02/01/2023]
Affiliation(s)
- Rosella Ferretti
- Dipartimento del Farmaco; Istituto Superiore di Sanità; Rome Italy
| | - Leo Zanitti
- Dipartimento del Farmaco; Istituto Superiore di Sanità; Rome Italy
| | - Adriano Casulli
- Dipartimento di Malattie Infettive, Parassitarie ed Immunomediate; Istituto Superiore di Sanità; Rome Italy
| | - Roberto Cirilli
- Dipartimento del Farmaco; Istituto Superiore di Sanità; Rome Italy
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28
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Gul T, Krzek M, Permentier HP, Fraaije MW, Bischoff R. Microbial Flavoprotein Monooxygenases as Mimics of Mammalian Flavin-Containing Monooxygenases for the Enantioselective Preparation of Drug Metabolites. Drug Metab Dispos 2016; 44:1270-6. [DOI: 10.1124/dmd.115.069104] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 03/15/2016] [Indexed: 12/27/2022] Open
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29
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Labrador GM, Bosson J, Breitbach ZS, Lim Y, Francotte ER, Sabia R, Villani C, Armstrong DW, Lacour J. High-Performance Liquid Chromatographic Resolution of Neutral and Cationic Hetero[6]Helicenes. Chirality 2016; 28:282-9. [DOI: 10.1002/chir.22579] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 01/04/2016] [Indexed: 02/04/2023]
Affiliation(s)
| | - Johann Bosson
- Department of Organic Chemistry; University of Geneva; Geneva Switzerland
| | - Zachary S. Breitbach
- Department of Chemistry and Biochemistry; University of Texas at Arlington; Arlington Texas USA
| | - Yeeun Lim
- Department of Chemistry and Biochemistry; University of Texas at Arlington; Arlington Texas USA
| | - Eric R. Francotte
- Global Discovery Chemistry; Novartis Institutes for BioMedical Research; Basel Switzerland
| | - Rocchina Sabia
- Department of Drug Chemistry and Technologies; University of Rome La Sapienza; Rome Italy
| | - Claudio Villani
- Department of Drug Chemistry and Technologies; University of Rome La Sapienza; Rome Italy
| | - Daniel W. Armstrong
- Department of Chemistry and Biochemistry; University of Texas at Arlington; Arlington Texas USA
| | - Jérôme Lacour
- Department of Organic Chemistry; University of Geneva; Geneva Switzerland
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30
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D'Ambrosio K, Carradori S, Monti SM, Buonanno M, Secci D, Vullo D, Supuran CT, De Simone G. Out of the active site binding pocket for carbonic anhydrase inhibitors. Chem Commun (Camb) 2015; 51:302-5. [DOI: 10.1039/c4cc07320g] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
2-Benzylsulfinylbenzoic acid binds to human carbonic anhydrase II in a mode completely different from any other class of carbonic anhydrase inhibitors investigated so far.
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Affiliation(s)
| | - Simone Carradori
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza University of Rome
- 00185 Rome
- Italy
| | | | | | - Daniela Secci
- Dipartimento di Chimica e Tecnologie del Farmaco
- Sapienza University of Rome
- 00185 Rome
- Italy
| | - Daniela Vullo
- Universitá degli Studi di Firenze
- Polo Scientifico
- Laboratorio di Chimica Bioinorganica
- 50019 Sesto Fiorentino
- Italy
| | - Claudiu T. Supuran
- Universitá degli Studi di Firenze
- Polo Scientifico
- Laboratorio di Chimica Bioinorganica
- 50019 Sesto Fiorentino
- Italy
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31
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Uccello-Barretta G, Schurig V, Balzano F, Vanni L, Aiello F, Mori M, Ghirga F. Synergistic Effects of Trace Amounts of Water in the Enantiodiscrimination Processes by Lipodex E: A Spectroscopic and Computational Investigation. Chirality 2014; 27:95-103. [DOI: 10.1002/chir.22394] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 08/29/2014] [Accepted: 09/03/2014] [Indexed: 11/10/2022]
Affiliation(s)
| | - Volker Schurig
- Institute of Organic Chemistry; University of Tübingen; Tübingen Germany
| | - Federica Balzano
- Department of Chemistry and Industrial Chemistry; University of Pisa; Pisa Italy
| | - Letizia Vanni
- Department of Chemistry and Industrial Chemistry; University of Pisa; Pisa Italy
| | - Federica Aiello
- Department of Chemistry and Industrial Chemistry; University of Pisa; Pisa Italy
| | - Mattia Mori
- Center for Life Nano Science@Sapienza; Istituto Italiano di Tecnologia; Rome Italy
| | - Francesca Ghirga
- Department of Chemistry and Drug Technology; Sapienza University; Rome Italy
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32
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Ahmed M, Gwairgi M, Ghanem A. Conventional Chiralpak ID vs. Capillary Chiralpak ID-3 Amylose Tris-(3-Chlorophenylcarbamate)-Based Chiral Stationary Phase Columns for the Enantioselective HPLC Separation of Pharmaceutical Racemates. Chirality 2014; 26:677-82. [DOI: 10.1002/chir.22390] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 08/19/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Marwa Ahmed
- Chirality Program, Biomedical Science; University of Canberra; Australian Capital Territory (ACT) Canberra Australia
| | - Marina Gwairgi
- Chirality Program, Biomedical Science; University of Canberra; Australian Capital Territory (ACT) Canberra Australia
| | - Ashraf Ghanem
- Chirality Program, Biomedical Science; University of Canberra; Australian Capital Territory (ACT) Canberra Australia
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33
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Influence of the nature of alkyl substituents on the high-performance liquid chromatography enantioseparation and retention of new atropisomeric 1,1′-bibenzimidazole derivatives on amylose tris(3,5-dimethylphenylcarbamate) chiral stationary phase. J Chromatogr A 2014; 1363:128-36. [DOI: 10.1016/j.chroma.2014.08.060] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 08/14/2014] [Accepted: 08/16/2014] [Indexed: 01/01/2023]
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