1
|
Ranc V, Chaloupková Z. Chiral discrimination of amino acids using phosphorene assisted graphene-enhanced Raman spectroscopy. Anal Chim Acta 2020; 1129:69-75. [PMID: 32891392 DOI: 10.1016/j.aca.2020.06.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/27/2020] [Accepted: 06/27/2020] [Indexed: 11/18/2022]
Abstract
Discrimination of enantiomers poses a scientific challenge as the chemical and physical properties of enantiomers are nearly identical. The chiral analysis is usually performed by separation techniques, including chromatography, electrophoresis, or optical instrumentation based on an interaction of the analyzed sample with a polarized beam of light. Here we present a novel method for a chiral screening based on a combination of the black phosphorus@Graphene nanocomposite and Raman spectroscopy. The nanocomposite allows to enhance the Raman signal with factors higher than 100 asymmetrically and provide altered signals for mixtures containing varying enantiomeric ratios of target compounds. Tryptophan, Phenylalanine, DOPA, Isoleucine, and Leucine were selected as model compounds; the method allows us to discriminate between mixtures with 10, 25, 50, 75, and 100% enantiomeric purity.
Collapse
Affiliation(s)
- Václav Ranc
- Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, 17. Listopadu 12, 77146, Olomouc, Czech Republic.
| | - Zuzana Chaloupková
- Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, 17. Listopadu 12, 77146, Olomouc, Czech Republic
| |
Collapse
|
2
|
Maia AS, Tiritan ME, Castro PML. Enantioselective degradation of ofloxacin and levofloxacin by the bacterial strains Labrys portucalensis F11 and Rhodococcus sp. FP1. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 155:144-151. [PMID: 29510309 DOI: 10.1016/j.ecoenv.2018.02.067] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 02/15/2018] [Accepted: 02/22/2018] [Indexed: 06/08/2023]
Abstract
Fluoroquinolones are a class of antibiotics widely prescribed in both human and veterinary medicine of high environmental concern and characterized as environmental micropollutants due to their ecotoxicity and persistence and antibacterial resistance potential. Ofloxacin and levofloxacin are chiral fluoroquinolones commercialized as racemate and in enantiomerically pure form, respectively. Since the pharmacological properties and toxicity of the enantiomers may be very different, understanding the stereochemistry of these compounds should be a priority in environmental monitoring. This work presents the biodegradation of racemic ofloxacin and its (S)-enantiomer levofloxacin by the bacterial strains Labrys portucalensis F11 and Rhodococcus sp. FP1 at a laboratory-scale microcosm following the removal and the behavior of the enantiomers. Strain F11 could degrade both antibiotics almost completely when acetate was supplied regularly to the cultures. Enrichment of the (R)-enantiomer was observed in FP1 and F11 cultures supplied with ofloxacin. Racemization was observed in the biodegradation of the pure (S)-ofloxacin (levofloxacin) by strain F11, which was confirmed by liquid chromatography - exact mass spectrometry. Biodegradation of ofloxacin at 450 µg L-1 by both bacterial strains expressed good linear fits (R2 > 0.98) according to the Rayleigh equation. The enantiomeric enrichment factors were comprised between - 22.5% to - 9.1%, and - 18.7% to - 9.0% in the biodegradation of ofloxacin by strains F11 and FP1, respectively, with no significant differences for the two bacteria under the same conditions. This is the first time that enantioselective biodegradation of ofloxacin and levofloxacin by single bacteria is reported.
Collapse
Affiliation(s)
- Alexandra S Maia
- CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Rua Central de Gandra, 1317, 4585-116 Gandra PRD, Portugal; Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital 172, 4200-374 Porto, Portugal
| | - Maria Elizabeth Tiritan
- CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Rua Central de Gandra, 1317, 4585-116 Gandra PRD, Portugal; Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Universidade do Porto, Edifício do Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4050-208 Matosinhos, Portugal.
| | - Paula M L Castro
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital 172, 4200-374 Porto, Portugal.
| |
Collapse
|
3
|
Tohala L, Oukacine F, Ravelet C, Peyrin E. Sequence requirements of oligonucleotide chiral selectors for the capillary electrophoresis resolution of low-affinity DNA binders. Electrophoresis 2017; 38:1383-1390. [PMID: 28256731 DOI: 10.1002/elps.201600516] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/21/2017] [Accepted: 02/28/2017] [Indexed: 12/23/2022]
Abstract
We recently reported that a great variety of DNA oligonucleotides (ONs) used as chiral selectors in partial-filling capillary electrophoresis (CE) exhibited interesting enantioresolution properties toward low-affinity DNA binders. Herein, the sequence prerequisites of ONs for the CE enantioseparation process were studied. First, the chiral resolution properties of a series of homopolymeric sequences (Poly-dT) of different lengths (from 5 to 60-mer) were investigated. It was shown that the size increase-dependent random coil-like conformation of Poly-dT favorably acted on the apparent selectivity and resolution. The base-unpairing state constituted also an important factor in the chiral resolution ability of ONs as the switch from the single-stranded to double-stranded structure was responsible for a significant decrease in the analyte selectivity range. Finally, the chemical diversity enhanced the enantioresolution ability of single-stranded ONs. The present work could lay the foundation for the design of performant ON chiral selectors for the CE separation of weak DNA binder enantiomers.
Collapse
Affiliation(s)
- Luma Tohala
- DPM, UMR 5063, Université Grenoble Alpes, CNRS, Grenoble, France
| | - Farid Oukacine
- DPM, UMR 5063, Université Grenoble Alpes, CNRS, Grenoble, France
| | - Corinne Ravelet
- DPM, UMR 5063, Université Grenoble Alpes, CNRS, Grenoble, France
| | - Eric Peyrin
- DPM, UMR 5063, Université Grenoble Alpes, CNRS, Grenoble, France
| |
Collapse
|
4
|
Maia AS, Castro PML, Tiritan ME. Integrated liquid chromatography method in enantioselective studies: Biodegradation of ofloxacin by an activated sludge consortium. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1029-1030:174-183. [PMID: 27433982 DOI: 10.1016/j.jchromb.2016.06.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Revised: 06/12/2016] [Accepted: 06/15/2016] [Indexed: 01/11/2023]
Abstract
Ofloxacin is a chiral fluoroquinolone commercialized as racemate and as its enantiomerically pure form levofloxacin. This work presents an integrated liquid chromatography (LC) method with fluorescence detection (FD) and exact mass spectrometry (EMS) developed to assess the enantiomeric biodegradation of ofloxacin and levofloxacin in laboratory-scale microcosms. The optimized enantioseparation conditions were achieved using a macrocyclic antibiotic ristocetin A-bonded CSP (150×2.1mm i.d.; particle size 5μm) under reversed-phase elution mode. The method was validated using a mineral salts medium as matrix and presented selectivity and linearity over a concentration range from 5μgL(-1) (quantification limit) to 350μgL(-1) for each enantiomer. The method was successfully applied to evaluate biodegradation of ofloxacin enantiomers at 250μgL(-1) by an activated sludge inoculum. Ofloxacin (racemic mixture) and (S)-enantiomer (levofloxacin) were degraded up to 58 and 52%, respectively. An additional degradable carbon source, acetate, enhanced biodegradation up to 23%. (S)-enantiomer presented the highest extent of degradation (66.8%) when ofloxacin was supplied along with acetate. Results indicated slightly higher biodegradation extents for the (S)-enantiomer when supplementation was done with ofloxacin. Degradation occurred faster in the first 3days and proceeded slowly until the end of the assays. The chromatographic results from LC-FD suggested the formation of the (R)-enantiomer during levofloxacin biodegradation which was confirmed by LC-MS with a LTQ Orbitrap XL.
Collapse
Affiliation(s)
- Alexandra S Maia
- CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Rua Central de Gandra, 1317, 4585-116 Gandra PRD, Portugal; Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal
| | - Paula M L Castro
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina - Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal
| | - Maria Elizabeth Tiritan
- CESPU, Instituto de Investigação e Formação Avançada em Ciências e Tecnologias da Saúde, Rua Central de Gandra, 1317, 4585-116 Gandra PRD, Portugal; Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Universidade do Porto, Rua dos Bragas 289, 4050-123 Porto, Portugal.
| |
Collapse
|
5
|
|
6
|
Tohala L, Oukacine F, Ravelet C, Peyrin E. Chiral resolution capabilities of DNA oligonucleotides. Anal Chem 2015; 87:5491-5. [PMID: 25978071 DOI: 10.1021/acs.analchem.5b01252] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Herein, we studied the chiral resolution properties of a repertoire of arbitrarily chosen DNA oligonucleotides (ON). Ten oligonucleotidic sequences characterized by diverse base compositions, sizes, and structural features, ranging from secondary structure-free homo-oligonucleotides to duplex, hairpin, and three-way junction architectures, were investigated as potential chiral selectors. Their enantioselective features were assessed by using ONs as running buffer additives in partial-filling capillary electrophoresis. It was shown that all the screened sequences displayed enantiodiscrimination capabilities toward small aromatic compounds. Under (sub)millimolar DNA concentration conditions, the combination of only three oligonucleotidic sequences provided the chiral resolution of around 20 racemates, including drugs, illegal drugs, amino-acids, and nucleosides. This work represents the first demonstration of such analyte selectivity spectrum for nucleic acid-based chiral separation tools.
Collapse
Affiliation(s)
- Luma Tohala
- Université Grenoble Alpes, DPM UMR 5063, F-38041 Grenoble, CNRS, DPM UMR 5063, F-38041 Grenoble, France
| | - Farid Oukacine
- Université Grenoble Alpes, DPM UMR 5063, F-38041 Grenoble, CNRS, DPM UMR 5063, F-38041 Grenoble, France
| | - Corinne Ravelet
- Université Grenoble Alpes, DPM UMR 5063, F-38041 Grenoble, CNRS, DPM UMR 5063, F-38041 Grenoble, France
| | - Eric Peyrin
- Université Grenoble Alpes, DPM UMR 5063, F-38041 Grenoble, CNRS, DPM UMR 5063, F-38041 Grenoble, France
| |
Collapse
|
7
|
Fu Y, Chen X, Zhang J, Li W. Intrinsic Enantioselectivity of Natural Polynucleotides Modulated by Copper Ions. Chirality 2015; 27:306-13. [DOI: 10.1002/chir.22430] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 12/28/2014] [Accepted: 01/07/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Yan Fu
- Key Laboratory of Systems Bioengineering MOE, Key Laboratory for Green Chemical Technology MOE; Tianjin University; Collaborative Innovation Center of Chemical Science and Chemical Engineering; Tianjin People's Republic of China
| | - Xiongfei Chen
- Key Laboratory of Systems Bioengineering MOE, Key Laboratory for Green Chemical Technology MOE; Tianjin University; Collaborative Innovation Center of Chemical Science and Chemical Engineering; Tianjin People's Republic of China
| | - Jinli Zhang
- Key Laboratory of Systems Bioengineering MOE, Key Laboratory for Green Chemical Technology MOE; Tianjin University; Collaborative Innovation Center of Chemical Science and Chemical Engineering; Tianjin People's Republic of China
| | - Wei Li
- Key Laboratory of Systems Bioengineering MOE, Key Laboratory for Green Chemical Technology MOE; Tianjin University; Collaborative Innovation Center of Chemical Science and Chemical Engineering; Tianjin People's Republic of China
| |
Collapse
|