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Queiroz LHS, Barros RS, de Sousa FF, Lage MR, Sarraguça MC, Ribeiro PRS. Preparation and Characterization of a Rifampicin Coamorphous Material with Tromethamine Coformer: An Experimental-Theoretical Study. Mol Pharm 2024; 21:1272-1284. [PMID: 38361428 DOI: 10.1021/acs.molpharmaceut.3c00947] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
Rifampicin (RIF) is an antibiotic used to treat tuberculosis and leprosy. Even though RIF is a market-available drug, it has a low aqueous solubility, hindering its bioavailability. Among the strategies for bioavailability improvement of poorly soluble drugs, coamorphous systems have been revealed as an alternative in the increase of the aqueous solubility of drug systems and at the same time also increasing the amorphous state stability and dissolution rate when compared with the neat drug. In this work, a new coamorphous form from RIF and tromethamine (TRIS) was synthesized by slow evaporation. Structural, electronic, and thermodynamic properties and solvation effects, as well as drug-coformer intermolecular interactions, were studied through density functional theory (DFT) calculations. Powder X-ray diffraction (PXRD) data allowed us to verify the formation of a new coamorphous. In addition, the DFT study indicates a possible intermolecular interaction by hydrogen bonds between the available amino and carbonyl groups of RIF and the hydroxyl and amino groups of TRIS. The theoretical spectra obtained are in good agreement with the experimental data, suggesting the main interactions occurring in the formation of the coamorphous system. PXRD was used to study the physical stability of the coamorphous system under accelerated ICH conditions (40 °C and 75% RH), indicating that the material remained in an amorphous state up to 180 days. The thermogravimetry result of this material showed a good thermal stability up to 153 °C, and differential scanning calorimetry showed that the glass temperature (Tg) was at 70.0 °C. Solubility studies demonstrated an increase in the solubility of RIF by 5.5-fold when compared with its crystalline counterpart. Therefore, this new material presents critical parameters that can be considered in the development of new coamorphous formulations.
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Affiliation(s)
- Luís H S Queiroz
- NUPFARQ, Programa de Pós-Graduação em Ciência dos Materiais (PPGCM), Centro de Ciências de Imperatriz (CCIM), Universidade Federal do Maranhão (UFMA), Imperatriz, Maranhão 65.900-410, Brazil
| | - Ranna S Barros
- NUPFARQ, Programa de Pós-Graduação em Ciência dos Materiais (PPGCM), Centro de Ciências de Imperatriz (CCIM), Universidade Federal do Maranhão (UFMA), Imperatriz, Maranhão 65.900-410, Brazil
| | - Francisco F de Sousa
- Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará (UFPA), Belém, Pará 65.075-110, Brazil
| | - Mateus R Lage
- NUPFARQ, Programa de Pós-Graduação em Ciência dos Materiais (PPGCM), Centro de Ciências de Imperatriz (CCIM), Universidade Federal do Maranhão (UFMA), Imperatriz, Maranhão 65.900-410, Brazil
- Coordenação do Curso de Ciência e Tecnologia, Centro de Ciências de Balsas, Universidade Federal do Maranhão (UFMA), Balsas, Maranhão 65.800-000, Brazil
| | - Mafalda C Sarraguça
- LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, Porto 4050-313, Portugal
| | - Paulo R S Ribeiro
- NUPFARQ, Programa de Pós-Graduação em Ciência dos Materiais (PPGCM), Centro de Ciências de Imperatriz (CCIM), Universidade Federal do Maranhão (UFMA), Imperatriz, Maranhão 65.900-410, Brazil
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de Oliveira Neto JG, Viana JR, Lima ADDSG, Lopes JBO, Ayala AP, Lage MR, Stoyanov SR, dos Santos AO, Lang R. Assessing the Novel Mixed Tutton Salts K 2Mn 0.03Ni 0.97(SO 4) 2(H 2O) 6 and K 2Mn 0.18Cu 0.82(SO 4) 2(H 2O) 6 for Thermochemical Heat Storage Applications: An Experimental-Theoretical Study. Molecules 2023; 28:8058. [PMID: 38138548 PMCID: PMC10745892 DOI: 10.3390/molecules28248058] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/17/2023] [Accepted: 11/19/2023] [Indexed: 12/24/2023] Open
Abstract
In this paper, novel mixed Tutton salts with the chemical formulas K2Mn0.03Ni0.97(SO4)2(H2O)6 and K2Mn0.18Cu0.82(SO4)2(H2O)6 were synthesized and studied as compounds for thermochemical heat storage potential. The crystallographic structures of single crystals were determined by X-ray diffraction. Additionally, a comprehensive computational study, based on density functional theory (DFT) calculations and Hirshfeld surface analysis, was performed to calculate structural, electronic, and thermodynamic properties of the coordination complexes [MII(H2O)6]2+ (MII = Mn, Ni, and Cu), as well as to investigate intermolecular interactions and voids in the framework. The axial compressions relative to octahedral coordination geometry observed in the crystal structures were correlated and elucidated using DFT investigations regarding Jahn-Teller effects arising from complexes with different spin multiplicities. The spatial distributions of the frontier molecular orbital and spin densities, as well as energy gaps, provided further insights into the stability of these complexes. Thermogravimetry, differential thermal analysis, and differential scanning calorimetry techniques were also applied to identify the thermal stability and physicochemical properties of the mixed crystals. Values of dehydration enthalpy and storage energy density per volume were also estimated. The two mixed sulfate hydrates reported here have low dehydration temperatures and high energy densities. Both have promising thermal properties for residential heat storage systems, superior to the Tutton salts previously reported.
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Affiliation(s)
- João G. de Oliveira Neto
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Jailton R. Viana
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Antonio D. da S. G. Lima
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Jardel B. O. Lopes
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Alejandro P. Ayala
- Department of Physics, Federal University of Ceará—UFC, Fortaleza 65455-900, CE, Brazil
| | - Mateus R. Lage
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
- Coordination of the Science and Technology Course, Federal University of Maranhão (UFMA), Campus Balsas, MA-140, km 04, Balsas 65800-000, MA, Brazil
| | - Stanislav R. Stoyanov
- Natural Resources Canada, CanmetENERGY Devon, 1 Oil Patch Drive, Devon, AB T9G 1A8, Canada
| | - Adenilson O. dos Santos
- Center for Social Sciences, Health and Technology, Federal University of Maranhão—UFMA, Imperatriz 65900-410, MA, Brazil
| | - Rossano Lang
- Institute of Science and Technology, Federal University of São Paulo—UNIFESP, São José dos Campos 12231-280, SP, Brazil
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Neto JGO, Viana JR, Lopes JBO, Lima ADSG, Sousa ML, Lage MR, Stoyanov SR, Lang R, Santos AO. Crystal growth, crystal structure determination, and computational studies of a new mixed (NH 4) 2Mn 1-xZn x(SO 4) 2(H 2O) 6 Tutton salt. J Mol Model 2022; 28:341. [PMID: 36197628 PMCID: PMC9534806 DOI: 10.1007/s00894-022-05323-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/13/2022] [Indexed: 11/27/2022]
Abstract
Tutton salts have been extensively explored in recent decades due to their attractive physical and chemical properties, which make them potential candidates for thermochemical heat storage systems and optical technologies. In this paper, a series of new mixed Tutton salts with the chemical formula (NH4)2Mn1–xZnx(SO4)2(H2O)6 is reported. Crystals are successfully grown by the solvent slow evaporation method and characterized by powder X-ray diffraction (PXRD) with Rietveld refinement. In particular, the crystal structure of the mixed (NH4)2Mn0.5Zn0.5(SO4)2(H2O)6 crystal is solved through PRXD data using the DICVOL06 algorithm for diffraction pattern indexing and the Le Bail method for lattice parameter and spatial group determination. The structure is refined using the Rietveld method implemented in TOPAS® and reported in the Cambridge Structural Database file number 2104098. Moreover, a computational study using Hirshfeld surface and crystal void analyses is conducted to identify and quantify the intermolecular interactions in the crystal structure as well as to determine the amount of free space in the unit cell. Furthermore, 2D-fingerprint plots are generated to evaluate the main intermolecular contacts that stabilize the crystal lattice. Density functional theory is employed to calculate the structural, thermodynamic, and electronic properties of the coordination [Zn(H2O)6]2+ and [Mn(H2O)6]2+ complexes present in the salts. Molecular orbitals, bond lengths, and the Jahn–Teller effect are also discussed. The findings suggest that in Mn-Zn salts several properties dependent on the electronic structure can be tuned up by modifying the chemical composition.
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Affiliation(s)
- João G. Oliveira Neto
- Center for Social Sciences, Health and Technology, Federal University of Maranhão - UFMA, Imperatriz, MA 65900-410 Brazil
| | - Jailton R. Viana
- Center for Social Sciences, Health and Technology, Federal University of Maranhão - UFMA, Imperatriz, MA 65900-410 Brazil
| | - Jardel B. O. Lopes
- Center for Social Sciences, Health and Technology, Federal University of Maranhão - UFMA, Imperatriz, MA 65900-410 Brazil
| | - Antonio D. S. G. Lima
- Center for Social Sciences, Health and Technology, Federal University of Maranhão - UFMA, Imperatriz, MA 65900-410 Brazil
| | - Marcus L. Sousa
- Chemistry Institute, State University of Campinas - UNICAMP, Campinas, SP 13083-970 Brazil
| | - Mateus R. Lage
- Center for Social Sciences, Health and Technology, Federal University of Maranhão - UFMA, Imperatriz, MA 65900-410 Brazil
- Federal University of Maranhão (UFMA), Campus Balsas, MA-140, km 04, Balsas, MA 65800-000 Brazil
| | - Stanislav R. Stoyanov
- Natural Resources Canada, CanmetENERGY Devon, 1 Oil Patch Drive, Devon, AB T9G 1A8 Canada
| | - Rossano Lang
- Institute of Science and Technology, Federal University of São Paulo - UNIFESP, São José dos Campos, SP 12231-280 Brazil
| | - Adenilson O. Santos
- Center for Social Sciences, Health and Technology, Federal University of Maranhão - UFMA, Imperatriz, MA 65900-410 Brazil
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dos Santos TC, Lage MR, da Silva AF, Fernandes TS, de M. Carneiro JW, Ronconi CM. Supramolecular dimers drive the reaction between CO2 and alkanolamines towards carbonate formation. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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R Sá M, Sarraguça JMG, de Sousa FF, Sarraguça MSC, Lopes JA, Lima ADDSG, Lage MR, Ribeiro PRS. Structural, thermal, vibrational, solubility and DFT studies of a tolbutamide co-amorphous drug delivery system for treatment of diabetes. Int J Pharm 2022; 615:121500. [PMID: 35077862 DOI: 10.1016/j.ijpharm.2022.121500] [Citation(s) in RCA: 1] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 01/12/2022] [Accepted: 01/18/2022] [Indexed: 11/16/2022]
Abstract
Among the strategies for bioavailability improvement of poorly soluble drugs, co-amorphous systems have revealed to have a significant impact in the increase of the aqueous solubility of the drug, and at the same time increasing the amorphous state stability and dissolution rate when compared with the neat drug. Tolbutamide (TBM) is an oral hypoglycemic drug largely used in the treatment of type II Mellitus diabetes. TBM is a class II drug according to the Biopharmaceutical Classification System, meaning that it has low solubility and higher permeability. The aim of this study was to synthesize a co-amorphous material of tolbutamide (TBM) with tromethamine (TRIS). Density functional theory (DFT), allowed to study the structural, electronic, and thermodynamic properties, as well as solvation effects. In same theory level, several interactions tests were performed to obtain the most thermodynamically favorable drug-coformer intermolecular interactions. The vibrational spectra (mid infrared and Raman spectroscopy) are in accordance with the theoretical studies, showing that the main molecular interactions are due to the carbonyl, sulfonyl, and amide groups of TMB and the alcohol and amine groups of TRIS. X-ray powder diffraction was used to study the physical stability in dry condition at 25 °C of the co-amorphous system, indicating that the material remained in an amorphous state up to 90 days. Differential scanning calorimetry and thermogravimetric results showed a high increase of the Tg when compared with the amorphous neat drug, from 4.3 °C to 83.7 °C, which generally translated into good physical stability. Solubilities studies demonstrated an increase in the solubility of TBM by 2.5 fold when compared with its crystalline counterpart.
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Affiliation(s)
- Mônica R Sá
- Programa de Pós-Graduação em Ciências dos Materiais, Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - Jorge M G Sarraguça
- Programa de Pós-Graduação em Ciências dos Materiais, Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - Francisco F de Sousa
- Programa de Pós-Graduação em Ciências dos Materiais, Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil; Instituto de Ciências Exatas e Naturais, Universidade Federal do Pará, CEP 66075-110 Belém, PA, Brazil
| | - Mafalda S C Sarraguça
- LAQV/REQUIMTE, Laboratório de Química Aplicada, Faculdade de Farmácia, Universidade do Porto, Portugal
| | - João A Lopes
- iMed.ULisboa, Research Institute for Medicines, Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Antonio Douglas da S G Lima
- Programa de Pós-Graduação em Ciências dos Materiais, Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil
| | - Mateus R Lage
- Programa de Pós-Graduação em Ciências dos Materiais, Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil; Coordenação do Curso de Ciência e Tecnologia, Universidade Federal do Maranhão, 65800-000 Balsas, MA, Brazil
| | - Paulo R S Ribeiro
- Programa de Pós-Graduação em Ciências dos Materiais, Centro de Ciências Sociais, Saúde e Tecnologia, Universidade Federal do Maranhão, Imperatriz, MA 65900-410, Brazil.
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Alves TA, Pinheiro PF, Praça-Fontes MM, Andrade-Vieira LF, Lourenço MP, Lage MR, Alves TA, Cruz FA, Carneiro JWM, Ferreira A, Soares TCB. Bioactivity and molecular properties of Phenoxyacetic Acids Derived from Eugenol and Guaiacol compared to the herbicide 2,4-D. AN ACAD BRAS CIENC 2021; 93:e20191368. [PMID: 34705933 DOI: 10.1590/0001-3765202120191368] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 07/16/2020] [Indexed: 11/22/2022] Open
Abstract
Herbicides are agrochemicals applied in the control of weeds. With the frequent and repetitive use of these substances, serious problems have been reported. Compounds of natural origin and their derivatives are attractive options to obtain new compounds with herbicidal properties. By aiming to develop compounds with potentiated herbicidal activity, phenoxyacetic acids were synthesized from eugenol and guaiacol. The synthesized compounds were characterized and the herbicidal potential of phenoxyacetic acids and precursors was evaluated through bioassays regarding the germination and initial development of Lactuca sativa and Sorghum bicolor seedlings, with the induction of DNA damage. The induction of changes in the mitotic cycle of meristematic cells of roots of L. sativa was also analyzed. At the concentration of 3 mmol L-1, phenols and their respective phenoxyacetic acids presented phytotoxic and cytotoxic activities in L. sativa and S. bicolor. Eugenol and guaiacol also presented genotoxic action in L. sativa. The toxic effect of eugenoxyacetic acid was more pronounced in L. sativa than in S. bicolor, similar to the commercial 2,4-D herbicide. Molecular properties of the phenols and their derivatives phenoxyacetic acids were compared with the ones obtained for the herbicide 2,4-D, where it was found a correlation between their molecular properties and bioactivity.
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Affiliation(s)
- Thammyres A Alves
- Programa de Pós-Graduação em Genética e Melhoramento da Universidade Federal do Espírito Santo, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil
| | - Patrícia F Pinheiro
- Universidade Federal de Viçosa, Departamento de Química, Avenida Peter Henry Rolfs, Campus Universitário, s/n, 36570-900 Viçosa, MG, Brazil
| | - Milene M Praça-Fontes
- Programa de Pós-Graduação em Genética e Melhoramento da Universidade Federal do Espírito Santo, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil.,Universidade Federal do Espírito Santo, Centro de Ciências Exatas, Naturais e da Saúde, Departamento de Biologia, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil
| | - Larissa F Andrade-Vieira
- Universidade Federal de Lavras, Departamento de Biologia, Aquenta Sol, s/n, 37200-000 Lavras, MG, Brazil
| | - Maicon P Lourenço
- Universidade Federal do Espírito Santo, Centro de Ciências Exatas, Naturais e da Saúde, Departamento de Química e Física, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil
| | - Mateus R Lage
- Programa de Pós-Graduação em Ciência dos Materiais, Universidade Federal do Maranhão, Centro de Ciências Sociais, Saúde e Tecnologia, Rua Urbano Santos, 1734, 65900-410 Imperatriz, MA, Brazil.,Universidade Federal do Maranhão, Campus Balsas, MA-140, Km 04, Centro, 65800-000 Balsas, MA, Brazil
| | - Thayllon A Alves
- Universidade Federal do Espírito Santo, Centro de Ciências Agrárias e Engenharias, Departamento de Agronomia, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil
| | - Franceli A Cruz
- Universidade Federal de Lavras, Departamento de Biologia, Aquenta Sol, s/n, 37200-000 Lavras, MG, Brazil
| | - José W M Carneiro
- Universidade Federal Fluminense, Departamento de Química Inorgânica, Outeiro São João Batista, s/n, 24020-141 Niterói, RJ, Brazil
| | - Adésio Ferreira
- Universidade Federal do Espírito Santo, Centro de Ciências Agrárias e Engenharias, Departamento de Agronomia, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil
| | - Taís C B Soares
- Programa de Pós-Graduação em Genética e Melhoramento da Universidade Federal do Espírito Santo, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil.,Universidade Federal do Espírito Santo, Centro de Ciências Exatas, Naturais e da Saúde, Departamento de Farmácia e Nutrição, Alto Universitário, s/n, 29500-000 Alegre, ES, Brazil
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Vinhal JO, Nege KK, Lage MR, de M Carneiro JW, Lima CF, Cassella RJ. Adsorption of the herbicides diquat and difenzoquat on polyurethane foam: Kinetic, equilibrium and computational studies. Ecotoxicol Environ Saf 2017; 145:597-604. [PMID: 28802141 DOI: 10.1016/j.ecoenv.2017.08.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [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: 04/18/2017] [Revised: 08/01/2017] [Accepted: 08/02/2017] [Indexed: 06/07/2023]
Abstract
This work reports a study about the adsorption of the herbicides diquat and difenzoquat from aqueous medium employing polyurethane foam (PUF) as the adsorbent and sodium dodecylsulfate (SDS) as the counter ion. The adsorption efficiency was shown to be dependent on the concentration of SDS in solution, since the formation of an ion-associate between cationic herbicides (diquat and difenzoquat) and anionic dodecylsulfate is a fundamental step of the process. A computational study was carried out to identify the possible structure of the ion-associates that are formed in solution. They are probably formed by three units of dodecylsulfate bound to one unit of diquat, and two units of dodecylsulfate bound to one unit of difenzoquat. The results obtained also showed that 95% of both herbicides present in 45mL of a solution containing 5.5mgL-1 could be retained by 300mg of PUF. The experimental data were well adjusted to the Freundlich isotherm (r2 ≥ 0.95) and to the pseudo-second-order kinetic equation. Also, the application of Morris-Weber and Reichenberg equations indicated that an intraparticle diffusion process is active in the control of adsorption kinetics.
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Affiliation(s)
- Jonas O Vinhal
- Instituto de Química, Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil; Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG 36570-000, Brazil
| | - Kassem K Nege
- Instituto de Química, Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil
| | - Mateus R Lage
- Instituto de Química, Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil
| | - José Walkimar de M Carneiro
- Instituto de Química, Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil
| | - Claudio F Lima
- Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG 36570-000, Brazil
| | - Ricardo J Cassella
- Instituto de Química, Programa de Pós-Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil.
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Oliveira FM, Barbosa LC, Fernandes SA, Lage MR, Carneiro JWDM, Kabeshov MA. Evaluation of some density functional methods for the estimation of hydrogen and carbon chemical shifts of phosphoramidates. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.06.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Vinhal JO, Lage MR, Carneiro JWM, Lima CF, Cassella RJ. Modeling, kinetic, and equilibrium characterization of paraquat adsorption onto polyurethane foam using the ion-pairing technique. J Environ Manage 2015; 156:200-208. [PMID: 25846000 DOI: 10.1016/j.jenvman.2015.03.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [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: 06/09/2014] [Revised: 03/02/2015] [Accepted: 03/13/2015] [Indexed: 06/04/2023]
Abstract
We studied the adsorption of paraquat onto polyurethane foam (PUF) when it was in a medium containing sodium dodecylsulfate (SDS). The adsorption efficiency was dependent on the concentration of SDS in solution, because the formation of an ion-associate between the cationic paraquat and the dodecylsulfate anion was found to be a fundamental step in the process. A computational study was carried out to identify the possible structure of the ion-associate in aqueous medium. The obtained data demonstrated that the structure is probably formed from four units of dodecylsulfate bonded to one paraquat moiety. The results showed that 94% of the paraquat present in 45 mL of a solution containing 3.90 × 10(-5) mol L(-1) could be retained by 300 mg of PUF, resulting in the removal of 2.20 mg of paraquat. The experimental data were reasonably adjusted to the Freundlich isotherm and to the pseudo-second-order kinetic model. Also, the application of Morris-Weber and Reichenberg models indicated that both film-diffusion and intraparticle-diffusion processes were active during the control of the adsorption kinetics.
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Affiliation(s)
- Jonas O Vinhal
- Instituto de Química, Programa de Pós Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil; Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG 36570-000, Brazil
| | - Mateus R Lage
- Instituto de Química, Programa de Pós Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil
| | - José Walkimar M Carneiro
- Instituto de Química, Programa de Pós Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil
| | - Claudio F Lima
- Departamento de Química, Universidade Federal de Viçosa, Viçosa, MG 36570-000, Brazil
| | - Ricardo J Cassella
- Instituto de Química, Programa de Pós Graduação em Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil.
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Varejao JO, Barbosa LC, Maltha CR, Lage MR, Lanznaster M, Carneiro JW, Forlani G. Voltammetric and Theoretical Study of the Redox Properties of Rubrolide Analogues. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.12.053] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Gomez JAG, Lage MR, Carneiro JWDM, Resende JALC, Vargas MD. Tautomerism in quinoxalines derived from the 1,4-naphthoquinone nucleus: acid mediated synthesis, X-ray molecular structure of 5-chlorobenzo[f]quinoxalin-6-ol and density functional theory calculations. J BRAZIL CHEM SOC 2013. [DOI: 10.1590/s0103-50532013000200007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Gomez JAG, Lage MR, Carneiro JWDM, Resende JALC, Vargas MD. Tautomerism in Quinoxalines Derived from the 1,4-Naphthoquinone Nucleus: Acid Mediated Synthesis, X-ray Molecular Structure of 5-Chlorobenzo[f]quinoxalin-6-ol and Density Functional Theory Calculations. J BRAZIL CHEM SOC 2013. [DOI: 10.5935/0103-5053.20130028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Barbosa LCA, Maltha CRA, Lage MR, Barcelos RC, Donà A, Carneiro JWM, Forlani G. Synthesis of rubrolide analogues as new inhibitors of the photosynthetic electron transport chain. J Agric Food Chem 2012; 60:10555-10563. [PMID: 23025464 DOI: 10.1021/jf302921n] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Many natural products have been used as a model for the development of new drugs and agrochemicals. Following this strategy 11 rubrolide analogues, bearing electron-withdrawing and -donating groups at both benzene rings, were prepared starting from commercially available mucobromic acid. The ability of all compounds to inhibit the photosynthetic electron transport chain in the chloroplast was investigated. The rubrolide analogues were effective in interfering with the light-driven ferricyanide reduction by isolated chloroplasts. The IC(50) values of the most active derivatives are in fact only 1 order of magnitude higher than those of commercial herbicides sharing the same mode of action, such as Diuron (0.27 μM). QSAR studies indicate that the most efficient compounds are those having higher ability to accept electrons, either by a reduction process or by an electrophilic reaction mechanism. The results obtained suggest that the rubrolide analogues represent promising candidates for the development of new active principles targeting photosynthesis to be used as herbicides.
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Affiliation(s)
- Luiz C A Barbosa
- Department of Chemistry, Federal University of Viçosa, Avenida P. H. Rolfs, CEP 36570-000 Viçosa, MG, Brazil.
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