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Saraiva GD, Ramiro de Castro AJ, Teixeira AMR, Sousa Neto VO, Lima JA, Juca RF, Soares JM, Freire PTC, de Sousa FF, Paraguassu W. Pressure-dependence Raman spectroscopy and the lattice dynamic calculations of Bi 2(MoO 4) 3 crystal. Spectrochim Acta A Mol Biomol Spectrosc 2023; 297:122711. [PMID: 37054566 DOI: 10.1016/j.saa.2023.122711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/28/2023] [Accepted: 04/03/2023] [Indexed: 05/14/2023]
Abstract
This work reports a pressure-dependent Raman spectroscopic study and the theoretical lattice dynamics calculations of a Bi2(MoO4)3 crystal. The lattice dynamics calculations were performed, based on a rigid ion model, to understand the vibrational properties of the Bi2(MoO4)3 system and to assign the experimental Raman modes under ambient conditions. The calculated vibrational properties were helpful to support pressure-dependent Raman results, including eventual structural changes induced by pressure changes. Raman spectra were measured in the spectral region between 20 and 1000 cm-1 and the evolution of the pressures values was recorded in the range of 0.1-14.7 GPa. Pressure-dependent Raman spectra showed changes observed at 2.6, 4.9 and 9.2 GPa, these changes being associated with structural phase transformations. Finally, principal component analysis (PCA) and hierarchical cluster analysis (HCA) were performed to infer the critical pressure of phase transformations undergone by the Bi2(MoO4)3 crystal.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil.
| | - A J Ramiro de Castro
- Universidade Federal do Ceará - Campus Quixadá, Cedro, Quixadá, CE 63902-580, Brazil
| | - A M R Teixeira
- Faculdade de Filosofia Dom Aureliano Matos, Universidade Estadual do Ceará, CEP 62.930-000 Limoeiro do Norte, CE, Brazil
| | - V O Sousa Neto
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, CEP 60.455-970 Fortaleza, CE, Brazil
| | - R F Juca
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - J M Soares
- Departamento de Física, Universidade do Estado do Rio Grande do Norte, Mossoró-RN CEP 59610-210, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, CEP 60.455-970 Fortaleza, CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - W Paraguassu
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
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da Silva LP, Almeida-Neto FWQ, Bezerra LL, Silva J, Monteiro NKV, Marinho MM, Dos Santos HS, Teixeira AMR, Marinho ES, de Lima-Neto P. Sulfonamide derived from anacardic acid as potential antichagasic: a theoretical approach based on molecular docking, molecular dynamics, and density functional theory calculations. J Mol Model 2023; 29:165. [PMID: 37117952 DOI: 10.1007/s00894-023-05566-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 04/19/2023] [Indexed: 04/30/2023]
Abstract
Chagas disease (CD) is a tropical disease caused by the parasite Trypanosoma cruzi, transmitted by the barber insect. Currently, there are approximately 7 million infected people in the world, and it is estimated that 70 million people could contract this disease. The anacardic acid (AA) showed effectiveness in in silico and in vitro tests. The antichagasic potential of five sulfonamide molecules, derived from anacardic acid, was evaluated from a molecular approach based on the density functional theory (DFT), molecular dynamics (MD), and molecular docking (docking) calculations. Methyl 2-methoxy-6- (8- (methylsulfonamide) octyl) benzoate (SA1); 2-methoxy-6- (8- (phenylsulfonamide) octyl) benzoate (SA2); methyl 2-methoxy-6- (8- (2methylphenyl sulfonamide) octyl) benzoate (SA3); methyl 2-methoxy-6- (8-(methylphenylsulfonamide)octyl)benzoate (SA4); methyl2-(8-(2,5-dimethylphenylsulfonamide)octyl)-6-methoxybenzoate (SA5) were the investigated molecules. The DFT calculations were performed using the B3LYP/6-311+G (d, p) level of theory. The global and local reactivity data showed that SA1 shows the highest molecular reactivity, while SA2 is the most stable derivative. In addition, the structures of investigated molecules were confirmed by the linear correlations higher than 0.98 displayed between the experimental and calculated spectroscopic data (IR and NMR). Molecular docking of the molecules showed a greater prominence for the SA1, SA2, and SA4 molecules in the results of distances of ligand-cruzain. In molecular dynamics, SA2 obtained better stability due to greater interactions with important amino acids of cruzain.
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Affiliation(s)
- Leonardo P da Silva
- Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE, Brazil.
| | | | - Lucas L Bezerra
- Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE, Brazil
| | - Jacilene Silva
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brazil
| | - Norberto K V Monteiro
- Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE, Brazil
| | - Márcia M Marinho
- Faculdade de Educação, Ciência e Letras de Iguatu, Universidade Estadual do Ceará, Iguatu, Ceará, Brazil
| | - Hélcio S Dos Santos
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brazil
- Centro de Ciências e Tecnologia, Curso de Química, Universidade Vale do Acaraú, Sobral, Ceará, Brazil
| | - Alexandre M R Teixeira
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brazil
- Departamento de Física, Universidade Regional do Cariri, Crato, Ceará, Brazil
| | - Emmanuel S Marinho
- Faculdade de Filosofia Dom Aureliano Matos, Universidade Estadual do Ceará, Limoeiro do Norte, CE, Brazil
| | - Pedro de Lima-Neto
- Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, Campus do Pici, Fortaleza, CE, Brazil
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3
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Rocha JE, de Freitas TS, Xavier JC, Pereira RLS, Pereira Junior FN, Nogueira CES, Marinho MM, Bandeira PN, Rodrigues LG, Marinho ES, de Lacerda BCGV, de Andrade EM, Teixeira AMR, Dos Santos HS, Coutinho HDM. ADMET study, spectroscopic characterization and effect of synthetic nitro chalcone in combination with norfloxacin, ciprofloxacin, and ethidium bromide against Staphylococcus aureus efflux pumps. Fundam Clin Pharmacol 2023; 37:163-173. [PMID: 36082507 DOI: 10.1111/fcp.12830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 08/30/2022] [Accepted: 09/06/2022] [Indexed: 01/25/2023]
Abstract
Chalcones are present in a wide variety of plants, having in their structure two aromatic rings that are linked together by a chain composed of three carbon atoms with α, β-unsaturated to carbonyl system. Bacteria have several drug resistance mechanisms, among them the efflux pump; this mechanism, when active, is able to expel different compounds from inside bacterial cells. Several efflux pumps have already been identified for Staphylococcus aureus bacteria, including MepA and NorA. Many chalcones have been isolated and identified with various activities, such as antimicrobial. In view of this, this article aimed to evaluate the antibiotic modifying effect of chalcone (E)-1-(2-hydroxyphenyl)-3-(3-nitrophenyl)prop-2-en-1-one against S. aureus carrier of NorA and MepA efflux pump. Regarding the antibiotic, there was a synergism when associated with ciprofloxacin in SA-K2068 strain, showing this chalcone as an alternative to reverse the resistance to this medicine. The physicochemical properties calculated were fundamental in the description of the predicted pharmacokinetic properties. Despite the mutagenic risk caused by the metabolic activation of nitrochalcone, it is possible to notice a pharmacological principle in a longer half-life for the performance of biological activities. The compound has a good bioavailability, as it is highly absorbed in the intestine and easily transported by plasma proteins, in addition to not presenting neurotoxic, hepatotoxic, and cardiotoxic damage.
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Affiliation(s)
- Janaína E Rocha
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brasil
| | - Thiago S de Freitas
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brasil
| | - Jayze C Xavier
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brasil
| | - Raimundo L S Pereira
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brasil
| | | | - Carlos E S Nogueira
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brasil
| | - Márcia M Marinho
- Faculdade de Educação, Ciência e Letras de Iguatu, Universidade Estadual do Ceará, Iguatu, Ceará, Brasil
| | - Paulo N Bandeira
- Centro de Ciencias Exatas e Tecnologia, Universidade Estadual do Vale do Acaraú, Sobral, Ceará, Brasil
| | - Leilane G Rodrigues
- Centro de Ciencias Exatas e Tecnologia, Universidade Estadual do Vale do Acaraú, Sobral, Ceará, Brasil
| | - Emmanuel S Marinho
- Faculdade de Filosofia Dom Aureliano Mato, Universidade Estadual do Ceará, Limoeiro do Norte, Ceará, Brasil
| | | | | | - Alexandre M R Teixeira
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brasil
| | - Hélcio S Dos Santos
- Centro de Ciencias Exatas e Tecnologia, Universidade Estadual do Vale do Acaraú, Sobral, Ceará, Brasil
| | - Henrique D M Coutinho
- Departamento de Química Biológica, Universidade Regional do Cariri, Crato, Ceará, Brasil
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4
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Oliveira RC, Bandeira PN, Lemos TLG, Dos Santos HS, Scherf JR, Rocha JE, Pereira RLS, Freitas TS, Freitas PR, Pereira-Junior FN, Marinho MM, Marinho EM, Marinho ES, Nogueira CES, Coutinho HDM, Teixeira AMR. In silico and in vitro evaluation of efflux pumps inhibition of α,β-amyrin. J Biomol Struct Dyn 2022; 40:12785-12799. [PMID: 34528866 DOI: 10.1080/07391102.2021.1976277] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The use of the bacterial efflux pump mechanism to reduce the concentrations of antibiotics in the intracellular to the extracellular region is one of the main mechanisms by which bacteria acquire resistance to antibiotics. The present study aims to evaluate the antibacterial activity of the α,β-amyrin mixture isolated from Protium heptaphyllum against the multidrug-resistant strains of Escherichia coli 06 and Staphylococcus aureus 10, and to verify the inhibition of the efflux resistance mechanisms against the strains of S. aureus 1199B and K2068, carrying the NorA and MepA efflux pumps, respectively. The α,β-amyrin did not show clinically relevant direct bacterial activity. However, the α,β-amyrin when associated with the gentamicin antibiotic presented synergistic effect against the multidrug-resistant bacterial strain of S. aureus 10. In strains with efflux pumps, α,β-amyrin was able to inhibit the action of the efflux protein NorA against Ethidium Bromide. However, this inhibitory effect was not observed in the MepA efflux pump. In addition, when evaluating the effect of standard efflux pump inhibitors, clorptomazine and CCCP, α,β-amyrin showed a decrease in MIC, demonstrating the presence of the efflux mechanism through synergism. Docking studies indicate that α, β-amyrin have a higher affinity energy to MepA, and NorA than ciprofloxacin and norfloxacin. Also, α, β-amyrin bind to the same region of the binding site as these antibiotics. It was concluded that the α, β-amyrin has the potential to increase antibacterial activity with the association of antibiotics, together with the ability to be a strong candidate for an efflux pump inhibitor.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Raíssa C Oliveira
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Paulo N Bandeira
- Science and Technology Centre, Course of Chemistry, State University Vale do Acaraú, Sobral, CE, Brazil
| | - Telma L G Lemos
- Department of Organic and Inorganic Chemistry, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Hélcio S Dos Santos
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil.,Science and Technology Centre, Course of Chemistry, State University Vale do Acaraú, Sobral, CE, Brazil
| | - Jackelyne R Scherf
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Janaina E Rocha
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Raimundo L S Pereira
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Thiago S Freitas
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Priscila R Freitas
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Francisco N Pereira-Junior
- Center of Agricultural Sciences and of the Biodiversity, Federal University of Cariri, Juazeiro do Norte, CE, Brazil
| | - Márcia M Marinho
- Faculty of Education, Sciences and Letters of Iguatu, State University of Ceará, Campus FECLI, Iguatu, CE, Brazil
| | - Emanuelle M Marinho
- Department of Analytical Chemistry and Physical Chemistry, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Emmanuel S Marinho
- Group of Theoretical Chemistry and Electrochemistry, State University of Ceará, Campus FAFIDAM, Limoeiro do Norte, CE, Brazil
| | - Carlos E S Nogueira
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil.,Department of Physics, Regional University of Cariri, Juazeiro do Norte, CE, Brazil
| | - Henrique D M Coutinho
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Alexandre M R Teixeira
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil.,Department of Physics, Regional University of Cariri, Juazeiro do Norte, CE, Brazil
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5
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Xavier MR, Freitas TS, Pereira RLS, Marinho EM, Bandeira PN, de Sousa AP, Oliveira LS, Bezerra LL, Neto JBA, Silva MMC, Cruz BG, Rocha JE, Barbosa CRS, da Silva AW, de Menezes JESA, Coutinho HDM, Marinho MM, Marinho ES, Dos Santos HS, Teixeira AMR. Anti-inflammatory effect, antibiotic potentiating activity against multidrug-resistant strains of Escherichia coli and Staphylococcus aureus, and evaluation of antibiotic resistance mechanisms by the ibuprofen derivative methyl 2-(-4-isobutylphenyl)propanoate. Microb Pathog 2022; 170:105697. [PMID: 35926804 DOI: 10.1016/j.micpath.2022.105697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 05/31/2022] [Accepted: 07/26/2022] [Indexed: 10/16/2022]
Abstract
The prevalence of multidrug-resistant (MDR) bacteria and the limited efficacy of current available antibiotics cause every year approximately 700 000 deaths per year. This study aimed to evaluate the anti-inflammatory effect and antibacterial potential of the ibuprofen derivative Methyl 2-(-4-isobutylphenyl)propanoate (MET-IBU). The molecular structure of MET-IBU was confirmed by Nuclear Magnetic Resonance (NMR) and, Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR) spectroscopy. Our in vivo study using adult zebrafish model demonstrated that the ibuprofen derivative MET-IBU also possesses anti-inflammatory effect, and in vitro antibacterial activity assays showed that in the association of ampicillin, norfloxacin, and gentamicin with MET-IBU occurred reduction in the minimum inhibitory concentration (MIC) for MDR bacterial strains of Escherichia coli 06 and Staphylococcus aureus 10, indicating a potentiating in the growth inhibition of these pathogenic bacteria. Regarding the strain of Staphylococcus aureus K2068 (overexpressing mepA gene), a potentiation of ethidium bromide was found in the association with MET-IBU, indicating the action of this compound on the efflux pump mechanism present in this strains. This result corroborates the molecular docking study that indicated a high affinity of the MET-IBU with the MepA efflux pump. It was also noticed an antibiotic potentiating activity in the association MET-IBU with norfloxacin against strains of Staphylococcus aureus 1199B (overexpressing norA gene) when compared to the norfloxacin control. This enhanced antibiotic effect of MET-IBU is associated with a second resistance mechanism, which is due to the modification in the topoisomerase enzyme. These results bring attention to the ibuprofen derivative MET-IBU as possible candidate for the development of new options for the treatment of bacterial infections with protective anti-inflammatory action.
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Affiliation(s)
- Maria R Xavier
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Thiago S Freitas
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Raimundo L S Pereira
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Emanuelle M Marinho
- Department of Analytical and Physical Chemistry, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Paulo N Bandeira
- Science and Technology Centre, Course of Chemistry, State University Vale do Acaraú, Sobral, CE, Brazil
| | - Amanda P de Sousa
- Science and Technology Centre, Course of Chemistry, State University Vale do Acaraú, Sobral, CE, Brazil
| | - Larissa S Oliveira
- Science and Technology Centre, Course of Chemistry, State University Vale do Acaraú, Sobral, CE, Brazil
| | - Lucas Lima Bezerra
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - José B A Neto
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Maria M C Silva
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Beatriz G Cruz
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Janaína E Rocha
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Cristina R S Barbosa
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Antonio W da Silva
- Graduate Program in Biotechnology of the Northeast Network of Biotechnology, State University of Ceará, Campus Itaperi, Fortaleza, CE, Brazil
| | - Jane E S A de Menezes
- Graduate Program in Natural Science, State University of Ceará, Campus Itaperi, Fortaleza, CE, Brazil
| | - Henrique D M Coutinho
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Márcia M Marinho
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Emmanuel S Marinho
- Group of Theoretical Chemistry and Electrochemistry, State University of Ceará, Campus FAFIDAM, Limoeiro do Norte, CE, Brazil
| | - Hélcio S Dos Santos
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil; Science and Technology Centre, Course of Chemistry, State University Vale do Acaraú, Sobral, CE, Brazil; Graduate Program in Biotechnology of the Northeast Network of Biotechnology, State University of Ceará, Campus Itaperi, Fortaleza, CE, Brazil; Graduate Program in Natural Science, State University of Ceará, Campus Itaperi, Fortaleza, CE, Brazil
| | - Alexandre M R Teixeira
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil; Graduate Program in Biotechnology of the Northeast Network of Biotechnology, State University of Ceará, Campus Itaperi, Fortaleza, CE, Brazil; Graduate Program in Natural Science, State University of Ceará, Campus Itaperi, Fortaleza, CE, Brazil.
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6
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Saraiva GD, Lobato LF, Ferreira AVL, Paraguassu W, Ramiro de Castro AJ, Jucá RF, Sousa Neto VO, Teixeira AMR, de Sousa FF. A temperature-dependent Raman scattering and X-ray diffraction study of K 2Mo 2O 7·H 2O and ab initio calculations of K 2Mo 2O 7. Spectrochim Acta A Mol Biomol Spectrosc 2021; 263:120184. [PMID: 34332238 DOI: 10.1016/j.saa.2021.120184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 07/09/2021] [Accepted: 07/10/2021] [Indexed: 06/13/2023]
Abstract
This study reports a temperature-dependent Raman scattering and X-ray diffraction study of K2Mo2O7·H2O. The high-temperature Raman scattering analysis shows that the material remains structurally stable, with triclinic symmetry, in a temperature range from 300 to 413 K and undergoes a structural phase transition between 413 and 418 K. This phase transition is most likely connected with the dehydration process of K2Mo2O7·H2O. The temperature-dependent X-ray diffraction patterns are measured from 30 to 573 K. The results show that the discovered phase transition occurs between 419 and 433 K, in good agreement with the Raman scattering results. According to the Raman data, with increasing temperature, the dehydrated crystal of K2Mo2O7 undergoes a new phase transformation at 603 K and melts at ~843 K. Principal component and hierarchical cluster analyses are performed based on the treatment of the raw spectral data to infer the phase transformations occurring in the material. Assignments of the Raman modes for the K2Mo2O7 system at ambient conditions are studied through first-principles calculations based on density functional perturbation theory. These calculations are applied to understand the electronic properties, including the band structure and the associated projected density of states, of K2Mo2O7 under the local density approximation.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Quixadá, CE 63902-098, Brazil.
| | - L F Lobato
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110, Belém, PA, Brazil
| | - A V L Ferreira
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Quixadá, CE 63902-098, Brazil
| | - W Paraguassu
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110, Belém, PA, Brazil
| | | | - R F Jucá
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Quixadá, CE 63902-098, Brazil
| | - V O Sousa Neto
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, Quixadá, CE 63902-098, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte, CE 63040-000, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110, Belém, PA, Brazil
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7
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Freitas TS, Xavier JC, Pereira RLS, Rocha JE, Campina FF, de Araújo Neto JB, Silva MMC, Barbosa CRS, Marinho ES, Nogueira CES, Dos Santos HS, Coutinho HDM, Teixeira AMR. In vitro and in silico studies of chalcones derived from natural acetophenone inhibitors of NorA and MepA multidrug efflux pumps in Staphylococcus aureus. Microb Pathog 2021; 161:105286. [PMID: 34793877 DOI: 10.1016/j.micpath.2021.105286] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 10/29/2021] [Accepted: 11/08/2021] [Indexed: 10/19/2022]
Abstract
Bacterial resistance induced by efflux pumps is a frequent concern in clinical treatments involving multi-resistant bacteria. Staphylococcus aureus is a microorganism responsible for several types of infections and has several strains carrying efflux pumps, among them are the strain 1199B (NorA overexpresser), and the strain K2068 (MepA overexpresser). In this work, four chalcones derived from Croton anisodontus with modifications in the B ring in their structures were tested regarding their ability to inhibit NorA and MepA efflux pumps. The efflux pump inhibition mechanism was tested with the ethidium bromide substrate in the presence and absence of standard efflux pump inhibitors. The minimum inhibitory concentration values were also compared to those of strains that do not overexpress these efflux pumps. In order to gain some insights about the efflux pump mechanisms of these chalcones, two homology models were created (NorA and MepA) for a docking procedure. In addition, the ADME properties (absorption, distribution, metabolism and excretion) were also evaluated. The tested chalcones promoted synergism of the norfloxacin antibiotic by inhibiting associated efflux pumps. All four tested chalcones appear to bind to the binding sites of the efflux pump models in the same fashion as other chalcones with efflux pump inhibition capabilities. It was also verified that the chalcones 1-4 are well absorbed in the intestine, but with a decrease in their bioavailability, resulting in a low volume of distribution in the blood plasma, in addition to having a mild CNS activity. However, the chalcone 3 and 4 were not toxic due to metabolic activation. Whereas the chalcones 1 and 2 present a mutagenic risk, depending on the oral dose administered. The tested chalcones have not antibacterial activity; however, they are capable of inhibiting efflux pumps for the 1199B and K2068 strains. They promoted synergism of the norfloxacin antibiotic by inhibiting associated efflux pumps, as well as other associated mechanisms.
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Affiliation(s)
- Thiago S Freitas
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Jayze C Xavier
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Raimundo L S Pereira
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Janaína E Rocha
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Fábia F Campina
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - José B de Araújo Neto
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Maria M C Silva
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Cristina R S Barbosa
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil
| | - Emmanuel S Marinho
- Group of Theoretical Chemistry and Electrochemistry, State University of Ceará, Campus FAFIDAM, Limoeiro do Norte, CE, Brazil
| | - Carlos E S Nogueira
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil; Department of Physics, Regional University of Cariri, Juazeiro do Norte, CE, Brazil
| | - Hélcio S Dos Santos
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil; Center for Exact Sciences and Technology - Chemistry Course, Vale do Acaraú University, Sobral, CE, Brazil
| | - Henrique D M Coutinho
- Group of Theoretical Chemistry and Electrochemistry, State University of Ceará, Campus FAFIDAM, Limoeiro do Norte, CE, Brazil
| | - Alexandre M R Teixeira
- Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brazil; Department of Physics, Regional University of Cariri, Juazeiro do Norte, CE, Brazil.
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8
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da Silva AW, Ferreira MKA, Rebouças EL, Mendes FRS, Dos S Moura AL, de Menezes JESA, Marinho MM, Marinho ES, Santos HS, Teixeira AMR. Anxiolytic-like effect of natural product 2-hydroxy-3,4,6-trimethoxyacetophenone isolated from Croton anisodontus in adult zebrafish via serotonergic neuromodulation involvement of the 5-HT system. Naunyn Schmiedebergs Arch Pharmacol 2021; 394:2023-2032. [PMID: 34251503 DOI: 10.1007/s00210-021-02116-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 06/22/2021] [Indexed: 10/20/2022]
Abstract
Benzodiazepines are highly effective in combating anxiety; however, they have considerable adverse effects, so it is important to discover new safe anxiolytic agents. This study was designed to investigate the effect of the natural product 2-hydroxy-3,4,6-trimethoxyacetophenone (HTMCX) on anxiety and seizure behavior in adult zebrafish and its possible mechanisms of action. The acute toxicity of 96 h of HTMCX was analyzed, and the open and light/dark field tests (n = 6 animals/group) were used to assess the anxiety behavior of animals treated with HTMCX. In addition, the mechanisms of action were investigated with antagonists of the GABAA, 5-HT receptors, and molecular anchorage study. Pentylenetetrazole (PTZ) was used to induce seizure by immersion. As a result, acetophenone HTMCX (1, 3 and 10 mg/kg; v.o.) was non-toxic and affected locomotor activity. The higher doses (3 and 10 mg/kg; v.o.) produced signs of anxiolytic action in the light/dark test, and this effect was reversed by the pizotifen (antagonist 5HTR1 and 5HTR2A/2C), having the potential to form a complex with 5HTR1B. However, the anxiolytic effect of HTMCX has not been abolished by flumazenil (antagonist GABAA), cyproheptadine (antagonist 5HTR2A), and granisetron (antagonist 5HTR3A/3B). Therefore, HTMCX demonstrated an anxiolytic effect, suggesting that the 5HTR1 and 5HTR2C receptors may be involved in the pharmacological performance of this acetophenone in the central nervous system.
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Affiliation(s)
- Antonio Wlisses da Silva
- Graduate Program in Biotechnology, Northeast Biotechnology Network, State University of Ceará, Fortaleza, CE, Brazil
| | - Maria Kueirislene A Ferreira
- Graduate Program in Natural Sciences, Natural Products Chemistry Laboratory, State University of Ceará, Fortaleza, CE, Brazil
| | - Emanuela L Rebouças
- Graduate Program in Biotechnology, Northeast Biotechnology Network, State University of Ceará, Fortaleza, CE, Brazil
| | - Francisco Rogenio S Mendes
- Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brasil
| | - Atilano Lucas Dos S Moura
- Graduate Program in Natural Sciences, Natural Products Chemistry Laboratory, State University of Ceará, Fortaleza, CE, Brazil
| | - Jane Eire S A de Menezes
- Graduate Program in Natural Sciences, Natural Products Chemistry Laboratory, State University of Ceará, Fortaleza, CE, Brazil
| | - Márcia Machado Marinho
- Faculty of Philosophy Dom Aureliano Matos, State University of Ceará, Limoeiro do Norte, CE, Brazil
| | - Emmanuel Silva Marinho
- Faculty of Philosophy Dom Aureliano Matos, State University of Ceará, Limoeiro do Norte, CE, Brazil
| | - Hélcio S Santos
- Graduate Program in Biotechnology, Northeast Biotechnology Network, State University of Ceará, Fortaleza, CE, Brazil.,Graduate Program in Natural Sciences, Natural Products Chemistry Laboratory, State University of Ceará, Fortaleza, CE, Brazil.,Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brasil.,Science and Technology Centre, Course of Chemistry, State University Vale do Acaraú, Sobral, CE, Brazil
| | - Alexandre M R Teixeira
- Graduate Program in Biotechnology, Northeast Biotechnology Network, State University of Ceará, Fortaleza, CE, Brazil. .,Graduate Program in Biological Chemistry, Department of Biological Chemistry, Regional University of Cariri, Crato, CE, Brasil.
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9
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Freitas TS, Campina FF, Costa MS, Rocha JNE, Cruz RP, Pinheiro JCA, Pereira-Júnior FN, Lima MA, Pires de Sá MSFC, Teixeira AMR, Coutinho HDM. UPLC-QTOF-MS/MS analysis and antibacterial activity of the Manilkara zapota (L.) P. Royen against Escherichia coli and other MDR bacteria. Cell Mol Biol (Noisy-le-grand) 2021; 67:116-124. [PMID: 34817358 DOI: 10.14715/cmb/2021.67.1.18] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 03/07/2021] [Indexed: 11/18/2022]
Abstract
With the spread of bacterial resistance against clinically used antibiotics, natural plant-derived products are being studied as new sources of antibacterial molecules. Manilkara zapota is a common plant species in the American continent that is used as a food source. Studies show the M. zapota extract is rich in phenolic substances that can serve as basic molecules for the pharmaceutical industry. An extract from fresh M. zapota leaves was produced and tested to identify the compounds present, as well as its direct antibacterial and clinical antibiotic modulatory activities. To analyze the results, a new statistical methodology based on the Shannon-Wiener index was tested, capable of correcting distortions in heterogeneous environments. The Hydroethanolic Extract of Manilkara zapota leaves (HEMzL) presented a wide variety of phenolic products, as well as tannins, in the UPLC analysis. The extract showed direct antibacterial activity against the standard Staphylococcus aureus strain, however, it either acted antagonistically when associated with the tested antibiotics, or it did not present statistical significance when compared to the control. This demonstrates a need to be cautious when associating natural products with antibiotics for clinical use, as a hindrance to infectious treatments may occur. As for the statistical analysis mechanism tested, this proved to be effective, reducing false negatives at low antibiotic concentrations and false positives at high concentrations in the microdilution plate.
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Affiliation(s)
- Thiago S Freitas
- Departamento de Quí-mica Biológica, Laboratório de Simulaçíµes e Espectroscopia Molecular - LASEMOL, Universidade Regional do Cariri, Crato, Ceará, Brasil.
| | - Fábia F Campina
- Departamento de Quí-mica Biológica, Laboratório de Microbiologia e Biologia Molecular - LMBM, Universidade Regional do Cariri, Crato, Ceará, Brasil.
| | - Maria S Costa
- Departamento de Quí-mica Biológica, Laboratório de Microbiologia e Biologia Molecular - LMBM, Universidade Regional do Cariri, Crato, Ceará, Brasil.
| | - Janaí Na E Rocha
- Departamento de Quí-mica Biológica, Laboratório de Microbiologia e Biologia Molecular - LMBM, Universidade Regional do Cariri, Crato, Ceará, Brasil.
| | - Rafael P Cruz
- Departamento de Quí-mica Biológica, Laboratório de Microbiologia e Biologia Molecular - LMBM, Universidade Regional do Cariri, Crato, Ceará, Brasil.
| | - Jacqueline C A Pinheiro
- Laboratório de Bioensaios - LABIO, Universidade Federal do Cariri - UFCA, Instituto de Formaçào de Educadores, Campus Brejo Santo, CE, Brasil.
| | - Francisco N Pereira-Júnior
- Centro de Ciíªncias Agrárias e da Biodiversidade - CCAB, Federal University of Cariri, Juazeiro do Norte, CE, Brazil.
| | - Micheline A Lima
- Department of Molecular Biology, Federal University of Paraí-ba, Joào Pessoa, Paraí-ba 58051-900, Brazil.
| | | | - Alexandre M R Teixeira
- Departamento de Quí-mica Biológica, Laboratório de Simulaçíµes e Espectroscopia Molecular - LASEMOL, Universidade Regional do Cariri, Crato, Ceará, Brasil.
| | - Henrique D M Coutinho
- Departamento de Quí-mica Biológica, Laboratório de Microbiologia e Biologia Molecular - LMBM, Universidade Regional do Cariri, Crato, Ceará, Brasil.
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10
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Vasconcelos DLM, de Sousa FF, da Silva Filho JG, Teixeira AMR, Façanha Filho PF, Ribeiro PRS, Freire PTC. Raman spectroscopy of captopril crystals under low-temperature conditions. Spectrochim Acta A Mol Biomol Spectrosc 2020; 243:118734. [PMID: 32810777 DOI: 10.1016/j.saa.2020.118734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 05/22/2020] [Accepted: 07/04/2020] [Indexed: 06/11/2023]
Abstract
The polymorphism is a characteristic of several active principles, and can affect the bioavailability of a drug. Among the drugs used in the treatment of heart diseases, captopril is one of the most widely used in the world. Despite the knowledge of vibrational properties of captopril under high temperature and under high pressure, a lack of information impedes the understanding of the substance in the crystal form at low temperatures. In this research, we investigated the vibrational properties of captopril crystals under cryogenic conditions in the 300-8 K interval using Raman spectroscopy. By observing the behavior of the inter- and intra-molecular vibrations it was possible to infer that the captopril molecules suffered a rearranging into the unit cell due slight orientational changes mainly involving CH⋯O hydrogen bonds. The phenomenon occurs in a large temperature range. However, the observed changes do not suggest the occurrence of a structural phase transition and the Raman spectra indicate that the trans conformation is recorded down to the lowest temperature available in the experiments.
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Affiliation(s)
- D L M Vasconcelos
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60455-760 Fortaleza, CE, Brazil.
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - J G da Silva Filho
- Centro de Ciências Sociais, Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão, Campus II, 65900-410 Imperatriz, MA, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, 63.010-970 Juazeiro do Norte, CE, Brazil
| | - P F Façanha Filho
- Centro de Ciências Sociais, Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão, Campus II, 65900-410 Imperatriz, MA, Brazil
| | - P R S Ribeiro
- Centro de Ciências Sociais, Saúde e Tecnologia (CCSST), Universidade Federal do Maranhão, Campus II, 65900-410 Imperatriz, MA, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60455-760 Fortaleza, CE, Brazil
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11
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Saraiva GD, Paraguassu W, de Castro AJR, de Sousa FF, da Silva Filho JG, Neto VOS, Lima JA, Teixeira AMR, Freire PTC. Lattice dynamics calculations and high-pressure Raman spectra of the ZnMoO 4. Spectrochim Acta A Mol Biomol Spectrosc 2020; 239:118501. [PMID: 32473562 DOI: 10.1016/j.saa.2020.118501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/16/2020] [Accepted: 05/17/2020] [Indexed: 06/11/2023]
Abstract
We report here the analysis of vibrational properties of the ZnMoO4 by using theoretical and experimental approaches, well as results of high pressure experiments in this system. The analysis of the lattice dynamics calculations through the classical rigid ion model, was applied to determine the mode assignment in the triclinic phase of the ZnMoO4. Additionally, the experimental high-pressure Raman spectra of the ZnMoO4 were carried out from 0 GPa up to 6.83 GPa to shed light on the structural stability of this system. The pressure-dependent studies showed that this crystal undergoes a first order phase transition at around 1.05 GPa. The Raman spectrum analysis of the new phase shows a significant change in the number of modes for the spectral range of 20-1000 cm-1. The instability of this phase occurs due to the decrease of the MoO bond lengths in the high-pressure phase, connected with tilting and/or rotations of the MoO4 tetrahedra leading to a disorder at the MoO4 sites. The second and third phase transformations were observed, respectively, at about 2.9 GPa and 4.77 GPa, with strong evidences, in the Raman spectra, of crystal symmetry change. The principal component analysis (PCA) and the hierarchical cluster analysis (HCA) were used in order to infer the intervals of pressure where the different phases do exist. Discussion about the number of non equivalent sites for Mo ions and the kind of coordination for molybdenum atoms is also furnished.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil.
| | - W Paraguassu
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - A J Ramiro de Castro
- Universidade Federal do Ceará, P. O. Box 6030, CEP 63.902-580 Quixadá, CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - J G da Silva Filho
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA, 65900-410, Brazil
| | - V O Sousa Neto
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, P. O. Box 6030, CEP 60.455-970 Fortaleza, CE, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte, CE 63040-000, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, P. O. Box 6030, CEP 60.455-970 Fortaleza, CE, Brazil
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12
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Freitas TSD, Xavier JDC, Pereira RLS, Rocha JE, Muniz DF, da Silva PT, da Hora JP, dos Santos HS, Bandeira PN, Nogueira CES, Teixeira AMR, Coutinho HDM. Direct antibacterial and antibiotic resistance modulatory activity of chalcones synthesized from the natural product 2-hydroxy-3,4,6-trimethoxyacetophenone. FEMS Microbiol Lett 2020; 367:5881301. [DOI: 10.1093/femsle/fnaa124] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 07/27/2020] [Indexed: 01/20/2023] Open
Abstract
ABSTRACT
Antibiotic for clinical use lose its effectiveness over time due to bacterial resistance. In this work, four chalcones with modifications in their ligands were synthesized from the natural product 2-hydroxy-3,4,6-trimethoxyacetophenone, characterized by nuclear magnetic resonance (NMR) and infrared spectroscopy, and tested in bacterial models to investigate the direct and modifiers effects of the antibiotic activity of these four novel chalcones. The tests followed the broth microdilution methodology to obtain the Minimum Inhibitory Concentration (MIC). The MIC/8 of the products were used in the resistance reversion test. The chalcone 2 showed the best result in terms of direct activity, with MIC 645 μg/mL for Staphylococcus aureus and 812 μg/mL for Escherichia coli. While, for the bacterial resistance reversal test, the chalcones presented several synergistic interactions, being that chalcone 4 had the best interaction with the tested antibiotics. It was found that the type of ligand, as well as its position in the ring, interferes in the modulation of the antibiotic activity. Our results show that chalcones are strong candidates to be used as antibacterial drug or in combination with antibiotics for the treatment of infections caused by multidrug-resistant (MDR) strains.
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Affiliation(s)
- Thiago Sampaio de Freitas
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - Jayze da Cunha Xavier
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - Raimundo L S Pereira
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - Janaina E Rocha
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - Dédora F Muniz
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - Priscila T da Silva
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - João P da Hora
- Centro de Ciências Exatas e Tecnologia, Universidade Estadual Vale do Acaraú, CEP 62.040-370, Campus Betânia, Sobral-CE, Brasil
| | - Hélcio S dos Santos
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
- Centro de Ciências Exatas e Tecnologia, Universidade Estadual Vale do Acaraú, CEP 62.040-370, Campus Betânia, Sobral-CE, Brasil
| | - Paulo N Bandeira
- Centro de Ciências Exatas e Tecnologia, Universidade Estadual Vale do Acaraú, CEP 62.040-370, Campus Betânia, Sobral-CE, Brasil
| | - Carlos E S Nogueira
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - Alexandre M R Teixeira
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
| | - Henrique D M Coutinho
- Departamento de Química Biológica, Universidade Regional do Cariri, CEP 63105-000, Crato, Ceará, Brasil
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Silva CB, da Silva Filho JG, Pinheiro GS, Teixeira AMR, de Sousa FF, Freire PTC. High-pressure studies on l,l-dileucine crystals by Raman spectroscopy and synchrotron X-ray diffraction combined with DFT calculations. Spectrochim Acta A Mol Biomol Spectrosc 2020; 229:117899. [PMID: 31839580 DOI: 10.1016/j.saa.2019.117899] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 10/24/2019] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
The vibrational properties of the dipeptide l-leucyl-l-leucine hydrate were investigated through Raman and infrared spectroscopy. With the aid of first principle calculations using the density functional theory, the assignment of the vibrational modes from the material was furnished. In addition, the behavior of the crystal under high pressure was investigated using Raman spectroscopy (~8 GPa) and synchrotron X-ray diffraction (~26 GPa). The results show significant changes in both the X-ray diffractogram and the Raman spectra, suggesting that l-leucyl-l-leucine hydrate undergoes a phase transition between 2.3 and 2.9 GPa. Finally, for pressures above 16 GPa the broadening of X-ray peaks suggests a disorder in the crystal lattice induced by high-pressure effects.
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Affiliation(s)
- C B Silva
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60.455-760 Fortaleza, CE, Brazil.
| | - J G da Silva Filho
- Instituto de Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - G S Pinheiro
- Departamento de Física, Universidade Federal do Piaui, campus Ministro Petrônio Portella, 64.049-550, Teresina, PI, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, 63.010-970 Juazeiro do Norte, CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, 66.075-110 Belém, PA, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, Campus do Pici, 60.455-760 Fortaleza, CE, Brazil
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14
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Saraiva GD, da Silva Filho JG, Saraiva-Souza A, de Castro AJR, Teixeira AMR, Luz-Lima C, Oliveira FGS, Neto VOS, Freire PTC, de Sousa FF. Temperature dependence Raman spectroscopy and DFT calculations of Bi 2(MoO 4) 3. Spectrochim Acta A Mol Biomol Spectrosc 2020; 224:117340. [PMID: 31330420 DOI: 10.1016/j.saa.2019.117340] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 06/26/2019] [Accepted: 07/04/2019] [Indexed: 06/10/2023]
Abstract
This work reports a theoretical and experimental study on the electronic and vibrational properties of Bi2(MoO4)3. First-principle calculations were applied to increase the understanding on the properties of the chemical composition through the energy bands. The conduction band minimum (CBM) is found at the high symmetric Γ-point, while the valence-band maximum (VBM) is located between the Z and the Γ-points. Therefore, these facts confirm that the Bi2(MoO4)3 crystal is a semiconductor compound with an indirect band-gap of about 2.1 eV. Moreover, lattice dynamic properties were calculated using density functional perturbation theory (DFPT) in order to assign the experimental Raman bands. In addition, we performed temperature-dependent Raman spectroscopic studies in the Bi2(MoO4)3 crystals to obtain information on structural changes induced by effects of the temperature change. From the changes observed in the Raman spectra phase transitions at ∼ 668 and 833 K were inferred, with the last one possibly related to the disorder due to the heating process.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil.
| | - J G da Silva Filho
- Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - A Saraiva-Souza
- Departamento de Física, Universidade Federal do Maranhão (UFMA), Campus Universitário do Bacanga, São Luís, Maranhão 65080-805, Brazil
| | - A J Ramiro de Castro
- Universidade Federal do Ceará - Campus Quixadá, Cedro, Quixadá, Ceará 63902-580, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte, CE 63040-000, Brazil
| | - C Luz-Lima
- Departamento de Física, Campus Ministro Petrônio Portella, Universidade Federal do Piauí, CEP 64.049-550 Teresina, PI, Brazil
| | - F G S Oliveira
- Departmento de Engenharia Metalúrgica e de Materiais, Universidade Federal do Ceará, Fortaleza Brasil, CEP 63.900-000 Fortaleza, CE, Brazil
| | - V O Sousa Neto
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.902-098 Quixadá, CE, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, P. O. Box 6030, CEP 60.455-970 Fortaleza, CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
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15
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N. Bandeira P, L. G. Lemos T, S. Santos H, C. S. de Carvalho M, P. Pinheiro D, O. de Moraes Filho M, Pessoa C, W. A. Barros-Nepomuceno F, H. S. Rodrigues T, R. V. Ribeiro P, S. Magalhães H, M. R. Teixeira A. Synthesis, structural characterization, and cytotoxic evaluation of chalcone derivatives. Med Chem Res 2019. [DOI: 10.1007/s00044-019-02434-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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16
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Macedo I, da Silva JH, da Silva PT, Cruz BG, do Vale JPC, Dos Santos HS, Bandeira PN, de Souza EB, Xavier MR, Coutinho HDM, Braz-Filho R, Teixeira AMR. Structural and Microbiological Characterization of 5-Hydroxy-3,7,4'-Trimethoxyflavone: A Flavonoid Isolated from Vitex gardneriana Schauer Leaves. Microb Drug Resist 2019; 25:434-438. [PMID: 30741597 DOI: 10.1089/mdr.2018.0359] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
INTRODUCTION Staphylococcus aureus represents the most common etiologic agent of purulent infections, affecting humans and animals. Escherichia coli is one of the principal causes of infectious diseases, mainly diarrheal diseases due to enterotoxin action. There are many reports indicating that these bacteria are multidrug-resistant (MDR) pathogens. OBJECTIVE In this study, we investigated the antimicrobial and modulatory activities of 5-hydroxy-3,7,4'-trimethoxyflavone (VG.EF.CLII) against E. coli and S. aureus strains. METHODS 5-Hydroxy-3,7,4'-trimethoxyflavone was isolated from Vitex gardneriana Schauer leaves and structurally characterized using nuclear magnetic resonance. The antibacterial effect of VG.EF.CLII and modulation of antibiotic activity, both determined by minimum inhibitory concentration, were assessed using microtiter plates. RESULTS VG.EF.CLII showed bacterial growth inhibition at concentrations ≤512 μg/mL, and synergistic effects were observed for the modulation of two distinct antibiotic classes (the fluoroquinolone norfloxacin and the aminoglycoside gentamicin). CONCLUSION 5-Hydroxy-3,7,4'-trimethoxyflavone isolated from V. gardneriana showed promising antimicrobial activity against MDR bacterial strains S. aureus 358 and E. coli 27 when associated with the antibiotics norfloxacin and gentamicin. Therefore, this natural product can contribute to the control of bacterial resistance.
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Affiliation(s)
- Iasminy Macedo
- 1 Department of Biological Chemistry, Regional University of Cariri, Crato, Brazil
| | - João H da Silva
- 1 Department of Biological Chemistry, Regional University of Cariri, Crato, Brazil.,2 Science and Technology Centre, Federal University of Cariri, Fortaleza, Brazil
| | - Priscila T da Silva
- 1 Department of Biological Chemistry, Regional University of Cariri, Crato, Brazil
| | - Beatriz G Cruz
- 1 Department of Biological Chemistry, Regional University of Cariri, Crato, Brazil
| | - Jean P C do Vale
- 3 Science and Technology Centre-Chemistry Course, State University Vale do Acaraú, Sobral, Brazil
| | - Hélcio S Dos Santos
- 3 Science and Technology Centre-Chemistry Course, State University Vale do Acaraú, Sobral, Brazil
| | - Paulo N Bandeira
- 3 Science and Technology Centre-Chemistry Course, State University Vale do Acaraú, Sobral, Brazil
| | - Elnatan B de Souza
- 4 Biological Sciences Course, Center for Agrarian and Biological Sciences, Herbarium Professor José de Abreu Matos, State University of Vale do Acaraú, Sobral, Brazil
| | - Maria R Xavier
- 1 Department of Biological Chemistry, Regional University of Cariri, Crato, Brazil
| | | | - Raimundo Braz-Filho
- 5 ICE-UFRRJ/Chemical Sciences Laboratory, FAPERJ/Chemistry Department, CCT-UENF, Campus dos Goytacazes, Brazil
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17
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T. da Silva P, C. Silva H, P. C. do Vale J, M. Frota V, H. S. Rodrigues T, B. de Souza E, M. P. Santiago G, N. Bandeira P, M. R. Teixeira A, S. Santos H. Circadian Rhythm and Larvicidal Activity Against Aedes aegypti of Essential Oils from Croton piauhiensis. ACTA ACUST UNITED AC 2019. [DOI: 10.21577/1984-6835.20190118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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18
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Saraiva GD, Maia JR, Lima JA, Nogueira CES, Freire PTC, de Sousa FF, Teixeira AMR, Mendes Filho J. Pressure induced transformations in sorbic acid. Spectrochim Acta A Mol Biomol Spectrosc 2017; 184:327-334. [PMID: 28528253 DOI: 10.1016/j.saa.2017.05.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 04/18/2017] [Accepted: 05/09/2017] [Indexed: 06/07/2023]
Abstract
This research reports a pressure dependent Raman study of the sorbic acid between 0.0 and 10.0GPa. The unpolarized Raman spectra were measured in the spectral range of 20-3000cm-1. The high-pressure Raman scattering study of the sorbic acid showed that it underwent a gradual, disordering process. At the room temperature and at the ambient pressure conditions, the crystal structure of the sorbic acid belongs to the monoclinic system with a C2/c (C2h6) space group. The pressure increase induced a higher disorder in the monoclinic unit cell, since a single bending mode, and only very broad stretching Raman modes are present at pressure of ~10GPa. Upon pressure release the high-pressure phase transforms directly into the ambient-pressure phase. The presence of the internal vibrational modes is a guarantee that the molecular structure is maintained. Beyond this, the presence of external modes shows that the crystal has a memory to reverse the process and suggest that the crystal, which was in high disorder (broad Raman bands), does not suffer decomposition in the crystalline structure. The DFT calculations for the sorbic acid were performed in order to understand the vibrational properties. The theoretical study showed that the volume of the unit cell and beta angle decrease significatively when passing from the 0.0GPa to 8.0GPa. The decreases in the volume and beta angle of this particular unit cell were supposed to induce the larger increase in the bandwidths of the observed bands, pointing to some disorder in the monoclinic phase.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.900-000, Quixadá, CE, Brazil.
| | - J R Maia
- Faculdade de Filosofia Dom Aureliano Mattos, Universidade Estadual do Ceará, CEP 63.900-000, Limoeiro do Norte, CE, Brazil
| | - J A Lima
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza-CE, Brazil
| | - C E S Nogueira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte - CE, CEP 63040-005, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza-CE, Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas, Universidade Federal do Sul e Sudeste do Pará, CEP 68.505-080, Marabá, PA, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte - CE, CEP 63040-005, Brazil
| | - J Mendes Filho
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza-CE, Brazil
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19
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de Sousa FF, Nogueira CES, Freire PTC, Moreira SGC, Teixeira AMR, de Menezes AS, Mendes Filho J, Saraiva GD. Conformational change in the C form of palmitic acid investigated by Raman spectroscopy and X-ray diffraction. Spectrochim Acta A Mol Biomol Spectrosc 2016; 161:162-169. [PMID: 26971026 DOI: 10.1016/j.saa.2016.02.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 01/25/2016] [Accepted: 02/28/2016] [Indexed: 06/05/2023]
Abstract
Fatty acids are substances found in most living beings in nature. Here we report the effect of the low temperature in the vibrational and structural properties of the C form of palmitic acid, a fatty acid with 16 carbon atoms. The Raman spectra were obtained in the temperature interval from 300 to 18K in the spectral range between 30 and 3100 cm(-1). The assignment of the duly observed bands was done based on the density functional theory. On cooling, the main changes observed in the lattice mode region of the Raman spectra were interpreted as a conformational modification undergone by the palmitic acid molecules in the unit cell. The X-ray diffraction measurements were obtained from 290 to 80K showing a slight modification in the lattice parameters at about 210K. Differential scanning calorimetry (DSC) measurements were recorded between 150 and 300K and no enthalpic anomaly in the DSC thermogram was observed. These techniques provided strong evidence of the conformational change in the molecules of palmitic acid at low temperatures.
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Affiliation(s)
- F F de Sousa
- Instituto de Ciências Exatas, Universidade Federal do Sul e Sudeste do Pará, CEP 68505-080 Marabá, PA, Brazil
| | - C E S Nogueira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte, CEP 63040-000, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, CEP 60455-760 Fortaleza, CE, Brazil
| | - S G C Moreira
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Juazeiro do Norte, CEP 63040-000, Brazil
| | - A S de Menezes
- Departamento de Física, Universidade Federal do Maranhão, CEP 65080-805 São Luis, MA, Brazil
| | - J Mendes Filho
- Departamento de Física, Universidade Federal do Ceará, CEP 60455-760 Fortaleza, CE, Brazil
| | - G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63900-000 Quixadá, CE, Brazil.
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20
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Nogueira CES, Caselli PES, Freire PTC, Teixeira AMR, Oliveira IMM, Bento RRF, Faria JLB, Gusmão GOM, Silva LE. Vibrational spectroscopy, ab initio calculations and Frontier Orbital analysis of 4,5,6,8,9-pentachloropyrimido-[1,2-a][1,8]naphthyridin-10-one. Spectrochim Acta A Mol Biomol Spectrosc 2015; 149:304-311. [PMID: 25965513 DOI: 10.1016/j.saa.2015.04.056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 04/13/2015] [Accepted: 04/20/2015] [Indexed: 06/04/2023]
Abstract
In this work we present a study of the vibrational spectra of 4,5,6,8,9-pentachloropyrimido-[1,2-a][1,8]naphthyridin-10-one, C11H2Cl5N3O, a substance belonging to the important pharmacological class of 1,8-naphthyridine derivatives. The Fourier transform infrared and the Fourier transform Raman spectra of the crystal were recorded at room temperature in the regions 400-4000 and 50-4000 cm(-1), respectively. Vibrational wavenumbers were predicted using Density Functional Theory calculations with the B3LYP functional on 6-31G(d,p) and 6-311++G(d,p) basis sets. The descriptions of the normal modes were made after calculating the potential energy distribution. Additionally, potential reaction sites were evaluated through Mulliken population and Frontier Orbital analysis.
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Affiliation(s)
- C E S Nogueira
- Departamento de Física, Universidade Regional do Cariri, 63010-970, Brazil.
| | - P E S Caselli
- Departamento de Física, Universidade Federal do Ceará, 60455-760, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, 60455-760, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, 63010-970, Brazil
| | - I M M Oliveira
- Departamento de Física, Universidade Regional do Cariri, 63010-970, Brazil
| | - R R F Bento
- Departamento de Física, Universidade Federal de Mato Grosso, 78060-900, Brazil
| | - J L B Faria
- Departamento de Física, Universidade Federal de Mato Grosso, 78060-900, Brazil
| | - G O M Gusmão
- Universidade Estadual do Piauí, Teresina, PI 64002-150, Brazil; Departamento de Física, Universidade Federal do Ceará, 60455-760, Brazil
| | - L E Silva
- Universidade Federal do Paraná, Setor Litoral, Matinhos 83260-000, Brazil
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Saraiva GD, Nogueira CES, Freire PTC, de Sousa FF, da Silva JH, Teixeira AMR, Mendes Filho J. Temperature-dependent vibrational spectroscopic study and DFT calculations of the sorbic acid. Spectrochim Acta A Mol Biomol Spectrosc 2015; 137:1409-1416. [PMID: 25310262 DOI: 10.1016/j.saa.2014.08.142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2014] [Revised: 07/05/2014] [Accepted: 08/31/2014] [Indexed: 06/04/2023]
Abstract
This work reports a temperature-dependent vibrational spectroscopic study of the sorbic acid (C6H8O2), as well as the mode assignment at ambient conditions, based on the density functional theory. Temperature-dependent vibrational properties have been performed in polycrystalline sorbic acid through both Raman and infrared spectroscopy in the 20-300 K and 80-300 K temperature ranges, respectively. These studies present the occurrence of some modifications in the Raman spectra that could be interpreted as a low temperature phase transition undergone by sorbic acid from the monoclinic phase to an unknown phase with conformational change of the molecules in the unit cell.
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Affiliation(s)
- G D Saraiva
- Faculdade de Educação Ciências e Letras do Sertão Central, Universidade Estadual do Ceará, CEP 63.900-000, Quixadá, CE Brazil.
| | - C E S Nogueira
- Departamento de Física, Universidade Regional do Cariri, Crato, CE 63010-970, Brazil
| | - P T C Freire
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza, CE Brazil
| | - F F de Sousa
- Instituto de Ciências Exatas, Universidade Federal do Sul e Sudeste do Pará, CEP 68.505-080, Marabá, PA Brazil
| | - J H da Silva
- Universidade Federal do Cariri, 63000-000 Juazeiro do Norte, CE, Brazil
| | - A M R Teixeira
- Departamento de Física, Universidade Regional do Cariri, Crato, CE 63010-970, Brazil
| | - J Mendes Filho
- Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030, CEP 60455-760, Fortaleza, CE Brazil
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Sampaio GMM, Teixeira AMR, Coutinho HDM, Sena Junior DM, Freire PTC, Bento RRF, Silva LE. Synthesis and antibacterial activity of a new derivative of the Meldrun acid: 2,2-dimethyl-5-(4H-1,2,4-triazol-4-ylaminomethylene)-1,3-dioxane-4,6-dione (C9H10N4O4). EXCLI J 2014; 13:1022-8. [PMID: 26417318 PMCID: PMC4464433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 07/29/2014] [Indexed: 12/04/2022]
Abstract
The discovery of new substances with proven antimicrobial activity is the current study goal of various researchers. Usage of synthetic products has grown considerably in the past few years due to processing agility, and capability of going through previous chemical modifications in order to enhance its biological activity. Widespread careless use of antimicrobials has made the number of resistant microorganisms rise significantly, thus demanding more efficient drugs to fight them. One of these synthetic candidates for this purpose is the substance 2,2-Dimethyl-5-(4H-1,2,4-triazol-4-ylaminomethylene)-1,3-dioxane-4,6-dione (C9H10N4O4), aminomethylene derivative from Meldrum's acid. This substance, alone and in association with common antibiotics, were evaluated in vitro for antimicrobial activity, and had their minimum inhibitory concentration (MIC) towards Staphylococcus aureus ATCC 25923, Escherichia coli ATCC 10536 and Pseudomonas aeruginosa ATCC 15442, as well as multiresistant strains Escherichia coli 27, Staphylococcus aureus 358 and Pseudomonas aeruginosa 03 determined. The antimicrobial modulation action tests of the aminoglycosides with C9H10N4O4 were performed according to the microdilution method, and resulted in observation of a positive synergic effect.
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Affiliation(s)
| | | | - Henrique D. M. Coutinho
- Mestrado em Bioprospecção Molecular,Departamento de Química Biológica, Universidade Regional do Cariri, 63010-970, Brasil,*To whom correspondence should be addressed: Henrique D. M. Coutinho, Departamento de Química Biológica, Universidade Regional do Cariri – URCA, Crato-CE, Brasil. Rua Cel. Antonio Luis 1161, Pimenta, 63105-000. Fone: +55(88)31021212; Fax +55(88) 31021291, E-mail:
| | | | - Paulo T. C. Freire
- Departamento de Física, Universidade Federal do Ceará, 60455-760, Brasil
| | - Ricardo R. F. Bento
- Departamento de Física, Universidade Federal de Mato Grosso, 78060-900, Brasil
| | - Luiz E. Silva
- Setor Litoral - Universidade Federal do Paraná, Matinhos, 83260-000, Brasil
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Oliveira MTA, Teixeira AMR, Coutinho HDM, Menezes IRA, Sena DM, Santos HS, de Mesquita BM, Albuquerque MRJR, Bandeira PN, Braz-Filho R. Identification and modulatory activity assessment of 2-hydroxy-3,4,6-trimethoxyacetophenone isolated from croton anisodontus müll. Arg.(euphorbiaceae). Nat Prod Commun 2014; 9:665-668. [PMID: 25026716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023] Open
Abstract
The n-hexane extract of the stem bark of Croton anisodontus yielded 2-hydroxy-3,4,6-trimethoxyacetophenone, a well-known substance, but isolated from this species for the first time. The antimicrobial and modulatory activities of the compound towards Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans, C. krusei and C. tropicalis strains were assessed. Antibiotics such as amikacin, gentamicin and neomycin were used in a sub-inhibitory concentration. Significant activity was observed towards P. aeruginosa and S. aureus 358, with p < 0.001 in association with amikacin. The present results place C anisodontus as an alternative source of 2-hydroxy-3,4,6-trimethoxyacetophenone with antibacterial potential.
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