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Sprega G, Kobidze G, Lo Faro AF, Sechi B, Peluso P, Farkas T, Busardò FP, Chankvetadze B. Separation of isotopologues of amphetamine with various degree of deuteration on achiral and polysaccharide-based chiral columns in high-performance liquid chromatography. J Chromatogr A 2024; 1730:465062. [PMID: 38889581 DOI: 10.1016/j.chroma.2024.465062] [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: 05/04/2024] [Revised: 06/06/2024] [Accepted: 06/07/2024] [Indexed: 06/20/2024]
Abstract
Hydrogen/deuterium (H/D) isotope effects are not unusual in chromatography and such phenomena have been observed in both gas- and liquid-phase separations. Despite the numerous reports on this topic, the understanding of mechanisms and the underlying noncovalent interactions at play remains rather challenging. In our recent study, we reported baseline separation of isotopologoues of some amphetamine (AMP) derivatives on achiral and polysaccharide-based chiral columns, as well as some correlations between the degree of separation of enantiomers and isotopologues on (the same) polysaccharide-based chiral column(s). Following our previous findings on isotope effects in high-performance liquid chromatography, we report herein a comparative study on the isotope effects observed with AMP and methamphetamine (MET). The impact of some pivotal factors such as the number of deuterium atoms part of AMP isotopologues, the structure of its isotopomers, the chemical structure of the achiral and chiral stationary phases used in this study, and the use of methanol- vs acetonitrile-containing mobile phases on the isotope effects was examined and discussed. Quantitative correlations between the observed isotope effects and the enantioselectivity of the chiral columns used are also shortly discussed. Furthermore, considering the chromatographic results as benchmark experimental data, we attempted to elucidate the molecular bases of the observed phenomena using quantum mechanics calculations.
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Affiliation(s)
- Giorgia Sprega
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, Ancona 60121, Italy
| | - Giorgi Kobidze
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, Ancona 60121, Italy
| | - Alfredo Fabrizio Lo Faro
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, Ancona 60121, Italy.
| | - Barbara Sechi
- Istituto di Chimica Biomolecolare ICB-CNR, Sede secondaria di Sassari, Traversa La Crucca 3, Regione Baldinca, Li Punti, Sassari 07100, Italy
| | - Paola Peluso
- Istituto di Chimica Biomolecolare ICB-CNR, Sede secondaria di Sassari, Traversa La Crucca 3, Regione Baldinca, Li Punti, Sassari 07100, Italy
| | - Tivadar Farkas
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi 0179, Georgia
| | - Francesco Paolo Busardò
- Department of Excellence-Biomedical Sciences and Public Health, Università Politecnica delle Marche, Ancona 60121, Italy
| | - Bezhan Chankvetadze
- Institute of Physical and Analytical Chemistry, School of Exact and Natural Sciences, Tbilisi State University, Tbilisi 0179, Georgia.
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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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Tintrop LK, Lieske-Overgrand JR, Wickneswaran K, Abis R, Brunstermann R, Jochmann MA, Schmidt TC. Isotope-labeling in situ derivatization and HS-SPME arrow GC-MS/MS for simultaneous determination of fatty acids and fatty acid methyl esters in aqueous matrices. Anal Bioanal Chem 2023; 415:6525-6536. [PMID: 37740751 PMCID: PMC10567957 DOI: 10.1007/s00216-023-04930-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/31/2023] [Accepted: 08/29/2023] [Indexed: 09/25/2023]
Abstract
Fatty acids (FAs) and fatty acid methyl esters (FAMEs) co-occur in many samples, and analysis of both substance classes is frequently of high interest. To this end, this study introduces the first method for simultaneous determination of FAs and FAMEs including fully automated solvent-free solid-phase microextraction (SPME) arrow headspace extraction combined with isotope-labeling in situ FA derivatization with deuterated methanol (CD3OD). By using the chromatographic isotope effect (ΔRt = 0.03 min) and the + 3 m/z mass shift, FAs can be selectively differentiated from the FAMEs during gas chromatography tandem-mass spectrometry (GC-MS/MS) operated in the multiple reaction monitoring (MRM) aquisition mode. Additionally, an approach is presented to predict the retention times of deuterated compounds. Optimization of the derivatization conditions was accomplished by design of experiments and found to be 20 min, 50 °C, 4 v/v% CD3OD, and pH 2.1. During method validation, FAs and FAMEs were calibrated in different concentration ranges by standard addition in five real matrices and ultrapure water leading to good linearities and method detection limits for FAs ranging from 1-30 µg L-1 and for FAMEs from 0.003-0.72 µg L-1. FAs and FAMEs were detected in real samples from surface water, wastewater treatment plant effluent, and three different bioreactor samples and could be quantified in concentrations ranging from 2-1056 µg L-1 for FAs and 0.01-14 µg L-1 for FAMEs.
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Affiliation(s)
- Lucie K Tintrop
- Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
- Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
| | - Jana R Lieske-Overgrand
- Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
| | - Kaliyani Wickneswaran
- Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
| | - Rukiyye Abis
- Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
| | - Ruth Brunstermann
- Urban Water and Waste Management, Faculty of Engineering, University of Duisburg-Essen, Universitätsstraße 15, 45141, Essen, Germany
| | - Maik A Jochmann
- Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany.
- Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany.
| | - Torsten C Schmidt
- Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
- Centre for Water and Environmental Research, University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany
- IWW Water Centre, Moritzstrasse 26, 45476, Mülheim an der Ruhr, Germany
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Ailuno G, Baldassari S, Balboni A, Drava G, Spalletti C, Tantillo E, Mazzanti M, Barbieri F, Thellung S, Florio T, Caviglioli G. Development and validation of a GC-MS method for determination of metformin in normal brain and in glioblastoma tissues. J Pharm Biomed Anal 2023; 234:115503. [PMID: 37295189 DOI: 10.1016/j.jpba.2023.115503] [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: 02/27/2023] [Revised: 05/30/2023] [Accepted: 06/01/2023] [Indexed: 06/12/2023]
Abstract
Metformin hydrochloride (MH) has recently been repurposed as an anticancer agent, showing antiproliferative activity in vitro and in vivo. In particular, experimental evidence has suggested its potential clinical efficacy in glioblastoma (GBM), a very aggressive tumor frequently characterized by gloomy prognosis. Unfortunately, the published literature concerning experimental applications of MH in glioblastoma animal models report no data on metformin levels reached in the brain, which, considering the high hydrophilicity of the drug, are likely very low. Therefore, new sensitive analytical methods to be applied on biological tissues are necessary to improve our knowledge of MH in vivo biodistribution and biological effects on tumors. In this research work, a GC-MS method for MH quantification in brain tissues is proposed. MH has been derivatized using N-methyl-bis(trifluoroacetamide), as already described in the literature, but the derivatization conditions have been optimized; moreover, deuterated MH has been selected as the best internal standard, after a comparative evaluation including other internal standards employed in published methods. After ascertaining method linearity, its accuracy, precision, specificity, repeatability, LOD and LOQ (0.373 µM and 1.242 µM, respectively, corresponding to 0.887 and 2.958 pmol/mg of wet tissue) have been evaluated on mouse brain tissue samples, obtained through a straightforward preparation procedure involving methanolic extraction from lyophilized brain homogenates and solid phase purification. The method has been validated on brain samples obtained from mice, either healthy or xenografted with GBM cells, receiving metformin dissolved in the drinking water. This analytical method can be usefully applied in preclinical studies aiming at clarifying MH mechanism of action in brain tumors.
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Affiliation(s)
- Giorgia Ailuno
- Department of Pharmacy, Università degli Studi di Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Sara Baldassari
- Department of Pharmacy, Università degli Studi di Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Alice Balboni
- Department of Pharmacy, Università degli Studi di Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Giuliana Drava
- Department of Pharmacy, Università degli Studi di Genova, Viale Cembrano 4, 16148 Genova, Italy
| | - Cristina Spalletti
- Institute of Neuroscience, National Research Council (CNR), Via Giuseppe Moruzzi 1, 56124 Pisa, Italy
| | - Elena Tantillo
- Institute of Neuroscience, National Research Council (CNR), Via Giuseppe Moruzzi 1, 56124 Pisa, Italy
| | - Michele Mazzanti
- Department of Biosciences, Università degli Studi di Milano, Via Giovanni Celoria 26, 20133 Milan, Italy
| | - Federica Barbieri
- Department of Internal Medicine, Università degli Studi di Genova, Viale Benedetto XV 2, 16132 Genova, Italy; IRCCS Ospedale Policlinico San Martino, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Stefano Thellung
- Department of Internal Medicine, Università degli Studi di Genova, Viale Benedetto XV 2, 16132 Genova, Italy
| | - Tullio Florio
- Department of Internal Medicine, Università degli Studi di Genova, Viale Benedetto XV 2, 16132 Genova, Italy; IRCCS Ospedale Policlinico San Martino, Largo Rosanna Benzi 10, 16132 Genova, Italy
| | - Gabriele Caviglioli
- Department of Pharmacy, Università degli Studi di Genova, Viale Cembrano 4, 16148 Genova, Italy.
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Aslani S, Armstrong DW. Effect of position of deuterium atoms on gas chromatographic isotope effects. Talanta 2023; 265:124857. [PMID: 37442006 DOI: 10.1016/j.talanta.2023.124857] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/12/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023]
Abstract
Deuterium substitution provides various benefits in drug molecules, including improvement in pharmacokinetic properties, reduction of toxicity, reduction of epimerization, etc. Also, it has been shown that the position of deuterium substitution affects the properties of drug molecules. Therefore, it is important to study low molecular weight deuterated isotopologues which constitute the deuterated pool and are building blocks of larger deuterated molecules. The effect of the position and number of deuterium atoms on the retention of 23 deuterated isotopologues on two gas chromatography stationary phases of different polarities was evaluated. It was observed that the ratio of calculated chromatographic isotope effects resulting from a deuterium atom connected to an sp2 vs. an sp3 hybridized carbon was more on the polar IL-111i stationary phase compared to the nonpolar PDMS-5, for each group of isotopologues. Also, a compound with a deuterium atom connected to an sp2 hybridized carbon always had greater retention than the analogous compound where deuterium was connected to an sp3 hybridized carbon. The van't Hoff plots for all analytes showed that the effect of entropy was almost negligible in the separation of deuterated vs. protiated isotopologues, thus these separations were mainly enthalpy driven.
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Affiliation(s)
- Saba Aslani
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX, 76019, United States
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX, 76019, United States.
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Wahab MF, Neill JL, Armstrong DW. Direct Construction of Peaks from Free Induction Decay Curves for Gas Chromatography-Molecular Rotational Resonance Spectroscopy without Fourier Transforms. Anal Chem 2022; 94:14611-14617. [PMID: 36219766 DOI: 10.1021/acs.analchem.2c02535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The concept of coupling gas chromatography with molecular rotational resonance spectroscopy (GC-MRR) was introduced in 2020, combining the separation capabilities of GC with the unparalleled specificity of MRR. In this study, we address the challenge of the high data throughput of MRR spectrometers, as GC-MRR spectrometers can generate thousands to millions of data points per second. In the previous GC-MRR studies, a free induction decay (FID) measurement was Fourier transformed to generate each point on the chromatogram. Such extensive calculations limit the performance, sensitivity, and speed of GC-MRR. A direct approach is proposed here to extract peak intensity from FID using the Gram-Schmidt vector orthogonalization method. First, analyte-free FIDs are used to construct a basis set representing the instrument's background noise, and then the remaining FIDs are orthogonalized to this fixed basis set. Each FID yields a single intensity value after Gram-Schmidt orthogonalization. The magnitude of the orthogonalized analyte FID is the signal intensity plotted in the chromatogram. This approach is computationally much faster (up to 10 times) than the conventional Fourier transform algorithm, is at least as sensitive as the FT algorithm, and maintains or improves the chromatographic peak shape. We compare the sensitivity, linearity, and chromatographic peak shapes for the Fourier transform and Gram-Schmidt approaches using both synthetically generated FIDs and instrumental data. This approach would allow the summed peak intensity to be displayed essentially in real-time, following which identified peaks can be further investigated to identify and quantify the species associated with each.
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Affiliation(s)
- M Farooq Wahab
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Arlington, Texas76019, United States
| | - Justin L Neill
- BrightSpec, Inc., 770 Harris St., Suite 104b, Charlottesville, Virginia22903, United States
| | - Daniel W Armstrong
- Department of Chemistry & Biochemistry, University of Texas at Arlington, Arlington, Texas76019, United States
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7
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Aslani S, Armstrong DW. High Information Spectroscopic Detection Techniques for Gas Chromatography. J Chromatogr A 2022; 1676:463255. [DOI: 10.1016/j.chroma.2022.463255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 06/10/2022] [Accepted: 06/14/2022] [Indexed: 01/14/2023]
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Ma X, Guo Y, Zhang L, Wang K, Yu A, Zhang S, Ouyang G. Crystal morphology tuning and green post-synthetic modification of metal organic framework for HPLC enantioseparation. Talanta 2021; 239:123143. [PMID: 34923255 DOI: 10.1016/j.talanta.2021.123143] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 12/09/2021] [Accepted: 12/11/2021] [Indexed: 10/19/2022]
Abstract
Chiral metal-organic frameworks (CMOFs) served as chiral stationary phases (CSPs) show great potential in enantioseparation field. However, their performance improvement are still hindered by the difficult column packed and high back pressure due to the irregular morphology and broad size scope of CMOF particles. Here, the size and morphology of achiral Co-MOF-74 were effectively adjusted by controlling the synthetic route, temperature, the ratio of reactants and the amount of 2-methylimidazole (2-MI) at first. As a result, the uniformly spherical crystals in size of about 5 μm with good dispersion were obtained. Subsequently, a simple, green post-synthetic modification strategy was proposed for the fabrication of l-tyrosine functionalized Co-MOF-74, namely Co-MOF-74-L-Tyr in H2O by incorporating l-tyrosine into the parent framework of Co-MOF-74 to construct chiral microenvironment. The homochiral Co-MOF-74-L-Tyr CSP gave superior enantioseparation performance for the eight chiral drugs and drug intermediates, such as nitrendipine, nimodipine, benzoin, 2,2'-furoin and bi-2-naphthol to the commercial columns under normal phase condition. The good repeatability and stability of this CSP was verified by the replicate enantioseparation for nimodipine and flavanone. Furthermore, the Co-MOF-74-L-Tyr packed column was successfully applied to detect the product N-1-(1-naphthyl)ethyltosylamide (HR-8) in the asymmetric reductive amination reaction. The size/morphology-controlled synthesis coupled with the green post-synthetic modification approach paves the way to fabricate target chiral MOFs with pre-designed functional groups, which is an effective complement for the preparation of CSPs in chiral chromatography.
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Affiliation(s)
- Xue Ma
- College of Chemistry, Key Laboratory of Molecular Sensing and Harmful Substances Detection Technology, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan, 450001, PR China
| | - Yun Guo
- College of Chemistry, Key Laboratory of Molecular Sensing and Harmful Substances Detection Technology, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan, 450001, PR China
| | - Ling Zhang
- College of Chemistry, Key Laboratory of Molecular Sensing and Harmful Substances Detection Technology, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan, 450001, PR China
| | - Kexuan Wang
- College of Chemistry, Key Laboratory of Molecular Sensing and Harmful Substances Detection Technology, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan, 450001, PR China
| | - Ajuan Yu
- College of Chemistry, Key Laboratory of Molecular Sensing and Harmful Substances Detection Technology, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan, 450001, PR China.
| | - Shusheng Zhang
- Center of Advanced Analysis and Gene Sequencing, Key Laboratory of Molecular Sensing and Harmful Substances Detection Technology, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan, 450001, PR China
| | - Gangfeng Ouyang
- Center of Advanced Analysis and Gene Sequencing, Key Laboratory of Molecular Sensing and Harmful Substances Detection Technology, Zhengzhou University, Kexue Avenue 100, Zhengzhou, Henan, 450001, PR China
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