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Carvalho SM, Mansur AAP, da Silveira IB, Pires TFS, Victória HFV, Krambrock K, Leite MF, Mansur HS. Nanozymes with Peroxidase-like Activity for Ferroptosis-Driven Biocatalytic Nanotherapeutics of Glioblastoma Cancer: 2D and 3D Spheroids Models. Pharmaceutics 2023; 15:1702. [PMID: 37376150 DOI: 10.3390/pharmaceutics15061702] [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: 05/09/2023] [Revised: 05/26/2023] [Accepted: 06/07/2023] [Indexed: 06/29/2023] Open
Abstract
Glioblastoma (GBM) is the most common primary brain cancer in adults. Despite the remarkable advancements in recent years in the realm of cancer diagnosis and therapy, regrettably, GBM remains the most lethal form of brain cancer. In this view, the fascinating area of nanotechnology has emerged as an innovative strategy for developing novel nanomaterials for cancer nanomedicine, such as artificial enzymes, termed nanozymes, with intrinsic enzyme-like activities. Therefore, this study reports for the first time the design, synthesis, and extensive characterization of innovative colloidal nanostructures made of cobalt-doped iron oxide nanoparticles chemically stabilized by a carboxymethylcellulose capping ligand (i.e., Co-MION), creating a peroxidase-like (POD) nanozyme for biocatalytically killing GBM cancer cells. These nanoconjugates were produced using a strictly green aqueous process under mild conditions to create non-toxic bioengineered nanotherapeutics against GBM cells. The nanozyme (Co-MION) showed a magnetite inorganic crystalline core with a uniform spherical morphology (diameter, 2R = 6-7 nm) stabilized by the CMC biopolymer, producing a hydrodynamic diameter (HD) of 41-52 nm and a negatively charged surface (ZP~-50 mV). Thus, we created supramolecular water-dispersible colloidal nanostructures composed of an inorganic core (Cox-MION) and a surrounding biopolymer shell (CMC). The nanozymes confirmed the cytotoxicity evaluated by an MTT bioassay using a 2D culture in vitro of U87 brain cancer cells, which was concentration-dependent and boosted by increasing the cobalt-doping content in the nanosystems. Additionally, the results confirmed that the lethality of U87 brain cancer cells was predominantly caused by the production of toxic cell-damaging reactive oxygen species (ROS) through the in situ generation of hydroxyl radicals (·OH) by the peroxidase-like activity displayed by nanozymes. Thus, the nanozymes induced apoptosis (i.e., programmed cell death) and ferroptosis (i.e., lipid peroxidation) pathways by intracellular biocatalytic enzyme-like activity. More importantly, based on the 3D spheroids model, these nanozymes inhibited tumor growth and remarkably reduced the malignant tumor volume after the nanotherapeutic treatment (ΔV~40%). The kinetics of the anticancer activity of these novel nanotherapeutic agents decreased with the time of incubation of the GBM 3D models, indicating a similar trend commonly observed in tumor microenvironments (TMEs). Furthermore, the results demonstrated that the 2D in vitro model overestimated the relative efficiency of the anticancer agents (i.e., nanozymes and the DOX drug) compared to the 3D spheroid models. These findings are notable as they evidenced that the 3D spheroid model resembles more precisely the TME of "real" brain cancer tumors in patients than 2D cell cultures. Thus, based on our groundwork, 3D tumor spheroid models might be able to offer transitional systems between conventional 2D cell cultures and complex biological in vivo models for evaluating anticancer agents more precisely. These nanotherapeutics offer a wide avenue of opportunities to develop innovative nanomedicines for fighting against cancerous tumors and reducing the frequency of severe side effects in conventionally applied chemotherapy-based treatments.
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Affiliation(s)
- Sandhra M Carvalho
- Center of Nanoscience, Nanotechnology, and Innovation-CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
| | - Alexandra A P Mansur
- Center of Nanoscience, Nanotechnology, and Innovation-CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
| | - Izabela B da Silveira
- Department of Physiology and Biophysics, Institute of Biological Sciences-ICB, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
| | - Thaisa F S Pires
- Center of Nanoscience, Nanotechnology, and Innovation-CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
| | - Henrique F V Victória
- Department of Physics, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
| | - M Fátima Leite
- Department of Physiology and Biophysics, Institute of Biological Sciences-ICB, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
| | - Herman S Mansur
- Center of Nanoscience, Nanotechnology, and Innovation-CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil
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Rodrigues BM, Victória HFV, Leite G, Krambrock K, Chaves OA, de Oliveira DF, Garcia RDQ, De Boni L, Costa LAS, Iglesias BA. Photophysical, photobiological, and biomolecule-binding properties of new tri-cationic meso-tri(2-thienyl)corroles with Pt(II) and Pd(II) polypyridyl derivatives. J Inorg Biochem 2023; 242:112149. [PMID: 36780772 DOI: 10.1016/j.jinorgbio.2023.112149] [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] [Received: 08/29/2022] [Revised: 01/19/2023] [Accepted: 01/21/2023] [Indexed: 01/26/2023]
Abstract
We report the synthesis and characterization of new tri-cationic corrole derivatives, containing Pt(II) or Pd(II) complexes attached at the peripheral position of thienyl moieties. Corrole derivatives were characterized through microanalysis, electrochemical, spectrometry and spectroscopy analysis. Singlet and triplet excited-states are investigated by photophysical/theoretical calculation methods and photobiological parameters were also evaluated spectroscopic techniques (UV-Vis and EPR). Also, the binding capacity of each corrole derivative with nucleic acids (DNA) and human serum albumin (HSA) was determined by UV-Vis, steady-state, and time-resolved fluorescence spectroscopy, combined with molecular docking analysis. Moreover, the new corroles containing peripheral complexes improve their interactions with biomacromolecules, generate reactive oxygen species under light source irradiation studied and has potential for application in photodynamic therapeutic processes.
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Affiliation(s)
- Bruna M Rodrigues
- Bioinorganic and Porphyrinoid Material Laboratory, Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil
| | - Henrique F V Victória
- Department of Physics, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Guilherme Leite
- Department of Physics, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
| | - Otávio A Chaves
- Department of Chemistry, University of Coimbra, Coimbra, Portugal
| | - Diego F de Oliveira
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP, Brazil
| | - Rafael de Q Garcia
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP, Brazil
| | - Leonardo De Boni
- São Carlos Institute of Physics, University of São Paulo, São Carlos, SP, Brazil
| | - Luiz A S Costa
- NEQC - Núcleo de Estudos em Química Computacional, Departament of Chemistry, Federal University of Juiz de Fora, Juiz de Fora, MG, Brazil
| | - Bernardo A Iglesias
- Bioinorganic and Porphyrinoid Material Laboratory, Department of Chemistry, Federal University of Santa Maria, Santa Maria, RS, Brazil.
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3
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Gil-Londoño J, Krambrock K, de Oliveira R, Cremona M, Maia da Costa MEH, Marinkovic BA. Extrinsic Point Defects in TiO 2-Acetylacetone Charge-Transfer Complex and Their Effects on Optical and Photochemical Properties. Inorg Chem 2023; 62:2273-2288. [PMID: 36700852 DOI: 10.1021/acs.inorgchem.2c04016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
TiO2-based visible-light-sensitive nanomaterials are widely studied for photocatalytic applications under UV-Vis radiation. Among the mechanisms of visible-light sensitization, extrinsic oxygen vacancies have been introduced into TiO2 and charge-transfer complexes (CTCs) have been formed between chelating ligands, such as acetylacetone, and nanocrystalline TiO2 (TiO2-ACAC). However, the influence of extrinsic oxygen vacancies on the photocatalytic performance of TiO2-based CTCs is unknown. In this work, surface/bulk extrinsic oxygen vacancies were introduced into TiO2-ACAC through calcination at 270 °C under static air, argon, and hydrogen atmospheres. TiO2-ACAC CTCs were characterized by X-ray powder diffraction, thermogravimetric analysis, diffuse-reflectance spectroscopy, photoluminescence, electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy techniques. The correlation between EPR-spin trapping and tetracycline (TC) photodegradation, using scavengers, highlighted the key role of the superoxide radical in TC degradation by TiO2-ACAC CTCs under low-power visible-light radiation. The increased extrinsic oxygen vacancies concentration was not beneficial for the photocatalytic performance of TiO2 CTCs, since bulk extrinsic oxygen vacancies additionally act as recombination centers. In fact, the TiO2-ACAC CTC with the lowest extrinsic oxygen vacancies concentration exhibited the highest photocatalytic performance for TC degradation due to an adequate distribution of extrinsic bulk oxygen vacancies, which led to the trapped electrons undergoing repeated hopping, reducing the recombination rates and improving the efficiency in superoxide radicals production. Our findings indicated that TiO2-ACAC CTCs are able to degrade pollutants via interactions with electronic holes and principally superoxide radicals and also, provided fundamental information about the influence of surface/bulk extrinsic oxygen vacancies on the photocatalytic performance, lattice parameters, and optical and photochemical properties of TiO2-based CTCs.
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Affiliation(s)
- Jessica Gil-Londoño
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro22453-900, Brazil
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais, Belo Horizonte31270-901, Brazil
| | - Raphaela de Oliveira
- Department of Physics, Federal University of Minas Gerais, Belo Horizonte31270-901, Brazil
| | - Marco Cremona
- Department of Physics, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro22453-900, Brazil
| | - Marcelo E H Maia da Costa
- Department of Physics, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro22453-900, Brazil
| | - Bojan A Marinkovic
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro22453-900, Brazil
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Moreno Diaz EC, Maia da Costa ME, Paraguassu W, Krambrock K, Dosen A, Johnson MB, White MA, Marinkovic BA. Extrinsic Point Defects in Low-Positive Thermal Expansion Al 2W 3O 12 and Their Effects on Thermal and Optical Properties. Inorg Chem 2022; 61:14086-14094. [PMID: 36007250 DOI: 10.1021/acs.inorgchem.2c02113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A2M3O12-type ceramics are potentially useful in a variety of applications due to their peculiar thermal and mechanical properties. In addition, their intrinsic coefficients of thermal expansion can be finely tuned through different mechanisms. Despite the great influence of extrinsic point defects on physical properties, only a few reports have dealt with their relationship to thermal expansion and thermal conductivity. Extrinsic oxygen vacancies in orthorhombic Al2W3O12, in different concentrations, were formed through heat treatments in argon or hydrogen atmospheres. X-ray powder diffraction, diffuse reflectance spectroscopy, and Raman and electron paramagnetic resonance spectroscopies were used to study the as-formed vacancies, and X-ray photoelectron spectroscopy was employed to propose a charge compensation mechanism. It was found that the intrinsic coefficient of thermal expansion of orthorhombic Al2W3O12 was severely affected by extrinsic oxygen vacancies. Thermal expansion was decreased up to 40% (from 25 to 400 °C) with respect to the extrinsic-point-defect-free counterpart. Unit-cell volumes of defective orthorhombic Al2W3O12 were larger, while their W-O bonds were weaker, likely leading to higher lattice flexibility and enhanced low-energy transverse acoustic modes. Extrinsic oxygen vacancies could be an additional mechanism for fine-tuning the intrinsic coefficients of thermal expansion in A2M3O12-type ceramics and in other framework structures built through two or threefold linkages.
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Affiliation(s)
- Esteban Camilo Moreno Diaz
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro 22453-900, Brazil
| | | | - Waldeci Paraguassu
- Department of Physics, Federal University of Pará, Belém 66075-110, Pará, Brazil
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais, Belo Horizonte 31270-901, Minas Gerais, Brazil
| | - Anja Dosen
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro 22453-900, Brazil
| | - Michel B Johnson
- Clean Technologies Research Institute, Dalhousie University, Halifax B3H 4R2, Nova Scotia, Canada
| | - Mary Anne White
- Clean Technologies Research Institute, Dalhousie University, Halifax B3H 4R2, Nova Scotia, Canada.,Department of Chemistry, Dalhousie University, Halifax B3H 4R2, Nova Scotia, Canada
| | - Bojan A Marinkovic
- Department of Chemical and Materials Engineering, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Rio de Janeiro 22453-900, Brazil
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5
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Mansur AA, Leonel AG, Krambrock K, Mansur HS. Bifunctional oxidase-peroxidase inorganic nanozyme catalytic cascade for wastewater remediation. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.11.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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6
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da Silva MAR, Gil JC, Tarakina NV, Silva GTST, Filho JBG, Krambrock K, Antonietti M, Ribeiro C, Teixeira IF. Selective methane photooxidation into methanol under mild conditions promoted by highly dispersed Cu atoms on crystalline carbon nitrides. Chem Commun (Camb) 2022; 58:7419-7422. [PMID: 35695323 DOI: 10.1039/d2cc01757a] [Citation(s) in RCA: 6] [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] [Indexed: 12/18/2022]
Abstract
Here we report a photocatalytic system based on crystalline carbon nitrides (PHI) and highly dispersed transition metals (Fe, Co and Cu) for controlled methane photooxidation to methanol under mild conditions. The Cu-PHI catalyst showed a remarkable methanol production (2900 μmol g-1) in 4 hours, with a turnover number of 51 moles of oxygenated liquid product per mole of Cu. To date, this result is the highest value for methane oxidation under mild conditions (1 bar, 25 °C).
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Affiliation(s)
- Marcos A R da Silva
- Department of Chemistry, Federal University of São Carlos, 13565-905, São Carlos, SP, Brazil. .,National Nanotechnology Laboratory for Agriculture, Brazilian Agriculture Research Corporation (Embrapa), XV de Novembro Street - 1452, São Carlos, Brazil
| | - Jéssica C Gil
- Department of Chemistry, Federal University of São Carlos, 13565-905, São Carlos, SP, Brazil. .,National Nanotechnology Laboratory for Agriculture, Brazilian Agriculture Research Corporation (Embrapa), XV de Novembro Street - 1452, São Carlos, Brazil
| | - Nadezda V Tarakina
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
| | - Gelson T S T Silva
- Department of Chemistry, Federal University of São Carlos, 13565-905, São Carlos, SP, Brazil. .,National Nanotechnology Laboratory for Agriculture, Brazilian Agriculture Research Corporation (Embrapa), XV de Novembro Street - 1452, São Carlos, Brazil
| | - José B G Filho
- Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais 35400-000, Brazil
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Markus Antonietti
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
| | - Caue Ribeiro
- National Nanotechnology Laboratory for Agriculture, Brazilian Agriculture Research Corporation (Embrapa), XV de Novembro Street - 1452, São Carlos, Brazil
| | - Ivo F Teixeira
- Department of Chemistry, Federal University of São Carlos, 13565-905, São Carlos, SP, Brazil. .,Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
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7
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Quadrado RF, Vitoria HF, Ferreira DC, Krambrock K, Moreira KS, Burgo TA, Iglesias BA, Fajardo AR. Hybrid polymer aerogels containing porphyrins as catalysts for efficient photodegradation of pharmaceuticals in water. J Colloid Interface Sci 2022; 613:461-476. [DOI: 10.1016/j.jcis.2022.01.002] [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] [Received: 11/26/2021] [Revised: 12/13/2021] [Accepted: 01/01/2022] [Indexed: 10/19/2022]
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8
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Victória HFV, Ferreira DC, Filho JBG, Martins DCS, Pinheiro MVB, Sáfar GDAM, Krambrock K. Detection of singlet oxygen by EPR: The instability of the nitroxyl radicals. Free Radic Biol Med 2022; 180:143-152. [PMID: 34979255 DOI: 10.1016/j.freeradbiomed.2021.12.303] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/16/2021] [Accepted: 12/17/2021] [Indexed: 11/23/2022]
Abstract
The use of spin traps and redox probes coupled with electron paramagnetic resonance (EPR) is a method frequently applied in the evaluation of the efficiency of photosensitizers and photocatalysts in phototherapeutic and photocatalytic processes that involve reactive oxygen species. In this way, the method helps to clarify the mechanism behind photo-induced reactions. Hydroxy-TEMP is a very specific redox probe for selectively identifying and quantifying singlet oxygen (1O2). In this work, the kinetics of radical generated by the oxidation products of the Hydroxy-TEMP redox probe was analyzed from EPR spectra in aqueous solutions of several water-soluble porphyrins ([H2T4MPyP](OTs)4, Na4[H2T4SPP], [H2T2MPyP](OTs)4, [ZnT4MyPyP](OTs)4, [MnT4MyPyP](OTs)5, H2T4CPP, and [H2T4TriMAPP](OTs)4) under white light illumination. Different factors such as the concentration of the redox probe, pH of the medium, and photostability of the porphyrins were evaluated. A systematic study was carried out to reveal the factors associated with stable radical degradation (TEMPOL) by illumination in the visible spectral region in systems containing photosensitizer (porphyrin) and redox probe (Hydroxy-TEMP). With the aid of EPR and gas chromatography coupled with mass spectroscopy (GC-MS) techniques, the mechanism of the radical degradation and the photobleaching of porphyrins were investigated. After successive interactions with the porphyrin in its excited state, in alkaline aqueous solution (pH > 10), the free radical TEMPOL is transformed into TEMPONE until the final diamagnetic product Phorone. A protocol was elaborated to identify and quantify the generation of 1O2 by Hydroxy-TEMP reliably, to avoid possible errors in the interpretation of efficiency of photosensitizers.
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Affiliation(s)
- Henrique F V Victória
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.
| | - Daniele C Ferreira
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - José B G Filho
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Dayse C S Martins
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Maurício V B Pinheiro
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Gustavo de A M Sáfar
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Klaus Krambrock
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.
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9
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Gonçalves DAF, Pinheiro MVB, Krambrock K, Resende RR, Galvão BRL, Lorençon E. Oxidative desulfurization of dibenzothiophene over highly dispersed Mo-doped graphitic carbon nitride. Chem Pap 2022. [DOI: 10.1007/s11696-022-02113-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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10
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Andrade PHM, Gomes ALM, Palhares HG, Volkringer C, Moissette A, Victória HFV, Hatem NMA, Krambrock K, Houmard M, Nunes EHM. Post-synthetic modification of aluminum trimesate and copper trimesate with TiO 2 nanoparticles for photocatalytic applications. J Mater Sci 2022; 57:4481-4503. [PMID: 35125514 PMCID: PMC8796608 DOI: 10.1007/s10853-021-06842-w] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Accepted: 12/20/2021] [Indexed: 06/14/2023]
Abstract
Organic pollutants have been a significant source of concern in recent years due to their facile dissemination and harmful effects. In this work, two different metal-organic frameworks (MOFs) were initially prepared by hydrothermal treatment, namely aluminum trimesate (MIL-100(Al)) and copper trimesate (HKUST-1). These materials were subsequently submitted to a post-synthetic modification step to grow titania nanoparticles on their surface. Anatase nanoparticles with sizes around 5 nm were successfully anchored on MIL-100(Al), and the concentration of TiO2 in this sample was about 68 wt.%. This is the first time that this composite (TiO2@MIL-100(Al)) is reported in the literature. It showed an improved photocatalytic activity, removing 90% of methylene blue (k app = 1.29 h-1), 55% of sodium diclofenac (k app = 0.21 h-1), and 62% of ibuprofen (k app = 0.37 h-1) after four hours of illumination with UV-A light. A significant concentration (14 µM) of reactive oxygen species (ROS) was detected for this composite. HKUST-1 showed a structural collapse during its post-synthetic modification, leading to a non-porous material and providing fewer sites for the heterogeneous nucleation of titania. This behavior led to a low concentration of rutile nanoparticles on HKUST-1 (9 wt.%). However, the obtained composite (TiO2@HKUST) also showed an improved photoactivity compared to HKUST-1, increasing the photodegradation rates evaluated for methylene blue (0.05 h-1 vs. 0.29 h-1), sodium diclofenac (negligible vs. 0.03 h-1), and ibuprofen (0.01 h-1 vs. 0.02 h-1). This work brings new insights concerning the preparation of photocatalysts by growing semiconductor nanoparticles on trimesate-based MOFs.
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Affiliation(s)
- Pedro H. M. Andrade
- Departamento de Engenharia Metalúrgica E de Materiais, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
- Laboratoire de Spectroscopie Pour Les Interactions, La Réactivité Et L’Environnement, Université de Lille—Sciences et Technologies, 59655 Villeneuve d’Ascq, France
| | - Ana L. M. Gomes
- Departamento de Engenharia Metalúrgica E de Materiais, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
| | - Hugo G. Palhares
- Departamento de Engenharia Metalúrgica E de Materiais, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
| | - Christophe Volkringer
- Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181, UCCS—Unité de Catalyse Et Chimie du Solide, 59000 Lille, France
| | - Alain Moissette
- Laboratoire de Spectroscopie Pour Les Interactions, La Réactivité Et L’Environnement, Université de Lille—Sciences et Technologies, 59655 Villeneuve d’Ascq, France
| | - Henrique F. V. Victória
- Departamento de Física, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
| | - Nádia M. A. Hatem
- Departamento de Física, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
| | - Klaus Krambrock
- Departamento de Física, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
| | - Manuel Houmard
- Departamento de Engenharia Química, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
| | - Eduardo H. M. Nunes
- Departamento de Engenharia Metalúrgica E de Materiais, Universidade Federal de Minas Gerais, Pampulha, Belo Horizonte, MG CEP 31270-901 Brazil
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11
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Tisoco I, Donatoni MC, Victória HFV, de Toledo JR, Krambrock K, Chaves OA, de Oliveira KT, Iglesias BA. Photophysical, photooxidation, and biomolecule-interaction of meso-tetra(thienyl)porphyrins containing peripheral Pt(II) and Pd(II) complexes. Insights for photodynamic therapy applications. Dalton Trans 2022; 51:1646-1657. [PMID: 35015799 DOI: 10.1039/d1dt03565g] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We report the synthesis and characterization of two novel tetra-cationic porphyrins, containing Pt(II) or Pd(II) polypyridyl complexes attached at the peripheral position of N4-macrocycle. Compounds were characterized through elemental analysis, molar conductivity, cyclic voltammetry, and spectroscopy analysis. Photophysical and photobiological parameters were also evaluated. Also, the binding capacity of each porphyrin with human serum albumin (HSA) was determined by UV-Vis, steady-state, and time-resolved fluorescence spectroscopy, combined with molecular docking calculations. The results suggest that the interaction of these compounds is spontaneous, weak to moderate, and probably occurs at site III (subdomain IB) by non-covalent forces, including van der Waals and H-bonding. Moreover, porphyrins containing peripheral complexes improve their interactions with biomolecules, show good photostability, generate reactive oxygen species under white light studied by electron paramagnetic resonance (EPR) analysis, and promote photo-damage of HSA.
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Affiliation(s)
- Isadora Tisoco
- Department of Chemistry, Federal University of Santa Maria, Av. Roraima, Santa Maria-RS, Brazil.
| | - Maria Carolina Donatoni
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luiz, São Carlos-SP, Brazil
| | | | - José Roberto de Toledo
- Department of Physics, Federal University of Minas Gerais, Av. Antônio Carlos, Belo Horizonte-MG, Brazil
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais, Av. Antônio Carlos, Belo Horizonte-MG, Brazil
| | | | - Kleber Thiago de Oliveira
- Department of Chemistry, Federal University of São Carlos, Rod. Washington Luiz, São Carlos-SP, Brazil
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12
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Mazzoni M, Toledo JR, Pereira-Andrade E, Krambrock K, Cury LA, Malachias Â, Sáfar GDAM. The special case of the spectral emission of a Tb3+ mono metal complex. Chemphyschem 2021; 23:e202100752. [PMID: 34931746 DOI: 10.1002/cphc.202100752] [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: 10/19/2021] [Revised: 12/06/2021] [Indexed: 11/08/2022]
Abstract
The fine structure in the spectral lines of the visible fluorescence of Tb 3+ complexes are replaced by a single peak in the case of a singular molecular complex Tb(H 3 PTC) 3 , where H 4 PTC represents perylene-3,4,9,10-tetracarboxylic acid, and its emission wavelength depends on the film thickness. This single peak challenges the old creed that the f-orbital electrons of Tb 3+ are always protected from the influence of the surrounding atoms. We perform density functional theory calculations to show that the wavefunction of the ground state is localized and in addition, spin-polarized, and this facilitates fluorescent transitions under UV to the first excited state instead of the fundamental state. We discuss the possibility of making a spintronic device with the molecule, Tb(H 3 PTC) 3 .
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Affiliation(s)
- Mário Mazzoni
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - J R Toledo
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo HOrizonte, BRAZIL
| | - Everton Pereira-Andrade
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - Klaus Krambrock
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - Luiz A Cury
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
| | - Ângelo Malachias
- Universidade Federal de Minas Gerais Instituto de Ciencias Exatas, Departamento de Física, Av. Antônio Carlos, 6627, Campus UFMG, Pampulha, 31270-901, Belo Horizonte, BRAZIL
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13
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Arifa RDN, de Paula TP, Lima RL, Brito CB, Andrade MER, Cardoso VN, Pinheiro MVB, Ladeira LO, Krambrock K, Teixeira MM, Fagundes CT, Souza DG. Anti-inflammatory and antioxidant effects of the nanocomposite Fullerol decrease the severity of intestinal inflammation induced by gut ischemia and reperfusion. Eur J Pharmacol 2021; 898:173984. [PMID: 33647256 DOI: 10.1016/j.ejphar.2021.173984] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 08/25/2020] [Revised: 02/15/2021] [Accepted: 02/23/2021] [Indexed: 12/12/2022]
Abstract
Intestinal ischemia is a vascular emergency that arises when blood flow to the intestine is compromised. Reperfusion is necessary to restore intestinal function but might lead to local and systemic inflammatory responses and bacterial translocation, with consequent multiple organ dysfunction syndrome (MODS). During reperfusion occurs production of reactive oxygen species. These species contribute to intestinal injury through direct toxicity or activation of inflammatory pathways. Fullerol is a nanacomposite which has been shown to act as reactive oxygen species and reactive nitrogen species (RNS) scavengers. Thus, our aim was to evaluate whether Fullerol confer anti-inflammatory activity during intestinal ischemia and reperfusion (IIR). Intestinal ischemia was induced by total occlusion of the superior mesenteric artery. Groups were treated with vehicle or Fullerol 10 min before reperfusion. Mice were euthanized after 6 h of reperfusion, and small intestines were collected for evaluation of plasma extravasation, leukocyte influx, cytokine production and histological damage. Bacterial translocation to the peritoneal cavity and reactive oxygen and nitrogen species production by lamina propria cells were also evaluated. Our results showed that treatment with Fullerol inhibited bacterial translocation to the peritoneal cavity, delayed and decreased the lethality rates and diminished neutrophil influx and intestinal injury induced by IIR. Reduced severity of reperfusion injury in Fullerol-treated mice was associated with blunted reactive oxygen and nitrogen species production in leukocytes isolated from gut lamina propria and decreased production of pro-inflammatory mediators. Thus, the present study shows that Fullerol is a potential therapy to treat inflammatory bowel disorders associated with bacterial translocation, such as IIR.
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Affiliation(s)
| | - Talles Prosperi de Paula
- Laboratório de Interação Microrganismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil
| | - Renata Lacerda Lima
- Laboratório de Interação Microrganismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil
| | - Camila Bernardo Brito
- Laboratório de Interação Microrganismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil
| | | | | | | | - Luiz Orlando Ladeira
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Klaus Krambrock
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Mauro Martins Teixeira
- Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil; Centro de Pesquisa e Desenvolvimento de Fármacos, Instituto de Ciências Biológicas, Belo Horizonte, MG, Brazil
| | - Caio Tavares Fagundes
- Laboratório de Interação Microrganismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Centro de Pesquisa e Desenvolvimento de Fármacos, Instituto de Ciências Biológicas, Belo Horizonte, MG, Brazil
| | - Daniele Gloria Souza
- Laboratório de Interação Microrganismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil.
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14
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Mansur AAP, Mansur HS, Leonel AG, Carvalho IC, Lage MCG, Carvalho SM, Krambrock K, Lobato ZIP. Supramolecular magnetonanohybrids for multimodal targeted therapy of triple-negative breast cancer cells. J Mater Chem B 2021; 8:7166-7188. [PMID: 32614035 DOI: 10.1039/d0tb01175d] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Despite the undeniable advances in recent decades, cancer remains one of the deadliest diseases of the current millennium, where the triple-negative breast cancer (TNBC) is very aggressive, extremely metastatic, and resistant to conventional chemotherapy. The nanotheranostic approach focusing on targeting membrane receptors often expressed at abnormal levels by cancer cells can be a strategic weapon for fighting malignant tumors. Herein, we introduced a novel "all-in-one nanosoldier" made of colloidal hybrid nanostructures, which were designed for simultaneously targeting, imaging, and killing TNBC cells. These nanohybrids comprised four distinct components: (a) superparamagnetic iron oxide nanoparticles, as bi-functional nanomaterials for inducing ferroptosis via inorganic nanozyme-mediated catalysis and magnetotherapy by hyperthermia treatment; (b) carboxymethyl cellulose biopolymer, as a water-soluble capping macromolecule; (c) folic acid, as the membranotopic vector for targeting folate receptors; (d) and doxorubicin (DOX) drug for chemotherapy. The results demonstrated that this novel strategy was highly effective for targeting and killing TNBC cells in vitro, expressing high levels of folate membrane-receptors. The results evidenced that three integrated mechanisms triggered the deaths of the cancer cells in vitro: (a) ferroptosis, by magnetite nanoparticles inducing a Fenton-like reaction; (b) magneto-hyperthermia effect by generating heat under an alternate magnetic field; and (c) chemotherapy, through the DOX intracellular release causing DNA dysfunction. This "all-in-one nanosoldier" strategy offers a vast realm of prospective alternatives for attacking cancer cells, combining multimodal therapy and the delivery of therapeutic agents to diseased sites and preserving healthy cells, which is one of the most critical clinical challenges faced in fighting drug-resistant breast cancers.
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Affiliation(s)
- Alexandra A P Mansur
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG, Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233, 31.270-901, Belo Horizonte/M.G., Brazil.
| | - Herman S Mansur
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG, Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233, 31.270-901, Belo Horizonte/M.G., Brazil.
| | - Alice G Leonel
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG, Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233, 31.270-901, Belo Horizonte/M.G., Brazil.
| | - Isadora C Carvalho
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG, Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233, 31.270-901, Belo Horizonte/M.G., Brazil.
| | - Manuela C G Lage
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG, Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233, 31.270-901, Belo Horizonte/M.G., Brazil.
| | - Sandhra M Carvalho
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG, Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233, 31.270-901, Belo Horizonte/M.G., Brazil.
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais - UFMG, Brazil
| | - Zelia I P Lobato
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais - UFMG, Brazil
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15
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Leonel AG, Mansur AAP, Carvalho SM, Outon LEF, Ardisson JD, Krambrock K, Mansur HS. Tunable magnetothermal properties of cobalt-doped magnetite-carboxymethylcellulose ferrofluids: smart nanoplatforms for potential magnetic hyperthermia applications in cancer therapy. Nanoscale Adv 2021; 3:1029-1046. [PMID: 36133299 PMCID: PMC9416810 DOI: 10.1039/d0na00820f] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Accepted: 01/02/2021] [Indexed: 05/09/2023]
Abstract
Magnetite nanoparticles are one of the most promising ferrofluids for hyperthermia applications due to the combination of unique physicochemical and magnetic properties. In this study, we designed and produced superparamagnetic ferrofluids composed of magnetite (Fe3O4, MION) and cobalt-doped magnetite (Co x -MION, x = 3, 5, and 10% mol of cobalt) nanoconjugates through an eco-friendly aqueous method using carboxymethylcellulose (CMC) as the biocompatible macromolecular ligand. The effect of the gradual increase of cobalt content in Fe3O4 nanocolloids was investigated in-depth using XRD, XRF, XPS, FTIR, DLS, zeta potential, EMR, and VSM analyses. Additionally, the cytotoxicity of these nanoconjugates and their ability to cause cancer cell death through heat induction were evaluated by MTT assays in vitro. The results demonstrated that the progressive substitution of Co in the magnetite host material significantly affected the magnetic anisotropy properties of the ferrofluids. Therefore, Co-doped ferrite (Co x Fe(3-x)O4) nanoconjugates enhanced the cell-killing activities in magnetic hyperthermia experiments under alternating magnetic field performed with human brain cancer cells (U87). On the other hand, the Co-doping process retained the pristine inverse spinel crystalline structure of MIONs, and it has not significantly altered the average nanoparticle size (ca.∼7.1 ± 1.6 nm). Thus, the incorporation of cobalt into magnetite-polymer nanostructures may constitute a smart strategy for tuning their magnetothermal capability towards cancer therapy by heat generation.
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Affiliation(s)
- Alice G Leonel
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG Av. Antônio Carlos 6627 - Belo Horizonte/MG Brazil
| | - Alexandra A P Mansur
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG Av. Antônio Carlos 6627 - Belo Horizonte/MG Brazil
| | - Sandhra M Carvalho
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG Av. Antônio Carlos 6627 - Belo Horizonte/MG Brazil
| | - Luis Eugenio F Outon
- Departament of Physics, Federal University of Minas Gerais - UFMG Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233 Belo Horizonte/MG 31.270-901 Brazil +55-31-34091843 +55-31-34091843
| | - José Domingos Ardisson
- Centro de Desenvolvimento da Tecnologia Nuclear - CDTN Av. Antônio Carlos 6627 - Belo Horizonte MG Brazil
| | - Klaus Krambrock
- Departament of Physics, Federal University of Minas Gerais - UFMG Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233 Belo Horizonte/MG 31.270-901 Brazil +55-31-34091843 +55-31-34091843
| | - Herman S Mansur
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais - UFMG Av. Antônio Carlos 6627 - Belo Horizonte/MG Brazil
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16
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Silva IF, Teixeira IF, Rios RDF, do Nascimento GM, Binatti I, Victória HFV, Krambrock K, Cury LA, Teixeira APC, Stumpf HO. Amoxicillin photodegradation under visible light catalyzed by metal-free carbon nitride: An investigation of the influence of the structural defects. J Hazard Mater 2021; 401:123713. [PMID: 33113722 DOI: 10.1016/j.jhazmat.2020.123713] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [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: 05/19/2020] [Revised: 08/10/2020] [Accepted: 08/11/2020] [Indexed: 06/11/2023]
Abstract
Herein, the structural defects of metal-free polymeric carbon nitrides were controlled by making use of different precursors in their syntheses, i.e. melamine (CN-M) and thiourea (CN-T), as well as a 1:1 mixture of them (CN-1M:1 T). By controlling the structural defects, the electronic, morphological and chemical properties were modified. Additionally, the activities of synthesized PCNs were evaluated for amoxicillin photodegradation under visible light irradiation (16 mW cm-2). The results of photocatalytic tests showed that CN-T material has better efficiency (100 % removal within 48 h), which is directly related to the greater number of defects present in its structure with consequent improvement of electron-hole pairs separation efficiency. The CN-T material showed excellent stability with only 13 % decrease in its photocatalytic activity after the third cycle. A mechanism for amoxicillin degradation by CN-T was proposed based on the ESI-MS and the in situ EPR allied with spin trapping method investigations.
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Affiliation(s)
- Ingrid F Silva
- Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Ivo F Teixeira
- Departamento de Química, Universidade Federal de São Carlos, São Carlos, SP, 13565-905, Brazil
| | - Regiane D F Rios
- Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Gustavo M do Nascimento
- Centro de Ciências Naturais e Humanas (CCNH), Universidade Federal do ABC, Santo André, SP, 09210-580, Brazil
| | - Ildefonso Binatti
- Departamento de Química, Centro Federal de Educação Tecnológica de Minas Gerais, 30421-169, Belo Horizonte, MG, Brazil
| | - Henrique F V Victória
- Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Klaus Krambrock
- Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Luiz A Cury
- Departamento de Física, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Ana Paula C Teixeira
- Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Humberto O Stumpf
- Departamento de Química, ICEx, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.
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17
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Della Rocca DG, Victória HFV, Moura-Nickel CD, Scaratti G, Krambrock K, De Noni A, Vilar VJP, José HJ, Moreira RFPM. Peroxidation and photo-peroxidation of pantoprazole in aqueous solution using silver molybdate as catalyst. Chemosphere 2021; 262:127671. [PMID: 32805651 DOI: 10.1016/j.chemosphere.2020.127671] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 04/17/2020] [Revised: 06/25/2020] [Accepted: 07/09/2020] [Indexed: 06/11/2023]
Abstract
In this study, silver molybdate was used as a catalyst in different oxidation processes to degrade pantoprazole (PAN) from aqueous suspension. The catalyst was synthesized using a controlled precipitation method and characterized by XRD, FTIR spectroscopy, BET analysis, Zeta potential, FEG-SEM/EDS, DRS and EPR. The α- and β-phases of Ag2MoO4 were identified as crystalline structure of the butterfly-shaped particles. The metastable α-phase could be completely converted into β-Ag2MoO4 by thermal treatment at 300 °C. The band gap energy of β-Ag2MoO4 (Eg = 3.25 eV) is slightly higher than for as-prepared catalyst (α-Ag2MoO4 + β-Ag2MoO4) (Eg = 3.09 eV), suggesting that as-prepared catalyst should be active under visible light. PAN is sensible to UV light irradiation, and the addition of H2O2 as electron acceptor enhanced the mineralization rate. In the catalytic UV-based reactions, high PAN oxidation efficiencies were obtained (>85%) but with low mineralization (32-64%). Catalytic peroxidation and photo-catalytic peroxidation under visible light showed the highest PAN oxidation efficiency, leading to its almost complete mineralization (>95%), even under dark conditions (98% in 120 min). Several degradation byproducts were identified and three mechanistic routes of PAN decomposition were proposed. The identified byproducts are less toxic than the parent compound. EPR coupled with the spin trapping method identified •OH radicals as the main ROS species in both photocatalytic and catalytic peroxidation reactions. Ag2MoO4 showed to be a promising catalyst to promote the decomposition of hydrogen peroxide into ROS.1.
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Affiliation(s)
- Daniela G Della Rocca
- Laboratory of Energy and Environment (LEMA), Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil.
| | - Henrique F V Victória
- Department of Physics, Federal University of Minas Gerais (UFMG), 31270-901, Belo Horizonte, MG, Brazil.
| | - Camilla Daniela Moura-Nickel
- Laboratory of Energy and Environment (LEMA), Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil.
| | - Gidiane Scaratti
- Laboratory of Energy and Environment (LEMA), Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil.
| | - Klaus Krambrock
- Department of Physics, Federal University of Minas Gerais (UFMG), 31270-901, Belo Horizonte, MG, Brazil.
| | - Agenor De Noni
- Laboratory of Energy and Environment (LEMA), Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil.
| | - Vítor J P Vilar
- Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Do Dr. Roberto Frias, 4200-465, Porto, Portugal.
| | - Humberto Jorge José
- Laboratory of Energy and Environment (LEMA), Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil.
| | - Regina F P M Moreira
- Laboratory of Energy and Environment (LEMA), Department of Chemical and Food Engineering, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, Brazil.
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da Silveira Santos F, da Silveira CH, Souza Nunes F, Ferreira DC, Victória HFV, Krambrock K, Chaves OA, Rodembusch FS, Iglesias BA. Photophysical, photodynamical, redox properties and BSA interactions of novel isomeric tetracationic peripheral palladium(II)-bipyridyl porphyrins. Dalton Trans 2020; 49:16278-16295. [PMID: 32400785 DOI: 10.1039/d0dt01063d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
New isomeric tetra-cationic porphyrins containing peripheral [Pd(bpy)Cl]+ units attached to pyridyl substituents were synthesized and fully characterized. The porphyrins present an intense Soret band located in the blue spectral region and an additional four weaker red-shifted Q bands in the visible spectral region (about 500-700 nm). The obtained Strickler-Berg parameters indicate fully spin and symmetry allowed transitions for all the observed absorption bands. Both porphyrins present two fluorescence emission bands, an intense one located around 650 nm and an additional weak red-shifted emission at ∼710 nm. Fluorescence decay time profiles were obtained showing bi-exponential decay. The interaction of the porphyrins with bovine serum albumin (BSA) was studied in detail by a fluorescence quenching method and molecular docking analysis. In addition, the photodynamical activity of the porphyrins in the photooxidation of BSA was determined and compared with the light-induced formation of reactive oxygen species (ROS) by electron paramagnetic resonance (EPR) allied with the spin trapping method. The results show that the Pd(ii)-bypyridyl tetra-cationic porphyrins are promising candidates for the photooxidation of biological substrates used in photodynamic therapy (PDT).
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Affiliation(s)
- Fabiano da Silveira Santos
- Grupo de pesquisa em Fotoquímica Orgânica Aplicada, Instituto de Química, Universidade Federal do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, RS, Brazil
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19
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Gottscholl A, Kianinia M, Soltamov V, Orlinskii S, Mamin G, Bradac C, Kasper C, Krambrock K, Sperlich A, Toth M, Aharonovich I, Dyakonov V. Initialization and read-out of intrinsic spin defects in a van der Waals crystal at room temperature. Nat Mater 2020; 19:540-545. [PMID: 32094496 DOI: 10.1038/s41563-020-0619-6] [Citation(s) in RCA: 115] [Impact Index Per Article: 28.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Accepted: 01/20/2020] [Indexed: 05/22/2023]
Abstract
Optically addressable spins in wide-bandgap semiconductors are a promising platform for exploring quantum phenomena. While colour centres in three-dimensional crystals such as diamond and silicon carbide were studied in detail, they were not observed experimentally in two-dimensional (2D) materials. Here, we report spin-dependent processes in the 2D material hexagonal boron nitride (hBN). We identify fluorescence lines associated with a particular defect, the negatively charged boron vacancy ([Formula: see text]), showing a triplet (S = 1) ground state and zero-field splitting of ~3.5 GHz. We establish that this centre exhibits optically detected magnetic resonance at room temperature and demonstrate its spin polarization under optical pumping, which leads to optically induced population inversion of the spin ground state-a prerequisite for coherent spin-manipulation schemes. Our results constitute a step forward in establishing 2D hBN as a prime platform for scalable quantum technologies, with potential for spin-based quantum information and sensing applications.
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Affiliation(s)
- Andreas Gottscholl
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | - Mehran Kianinia
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia
| | - Victor Soltamov
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | | | | | - Carlo Bradac
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia
| | - Christian Kasper
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | - Klaus Krambrock
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Andreas Sperlich
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany
| | - Milos Toth
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia
- ARC Centre of Excellence for Transformative Meta-Optical Systems, University of Technology Sydney, Ultimo, New South Wales, Australia
| | - Igor Aharonovich
- School of Mathematics and Physical Sciences, University of Technology Sydney, Ultimo, New South Wales, Australia.
- ARC Centre of Excellence for Transformative Meta-Optical Systems, University of Technology Sydney, Ultimo, New South Wales, Australia.
| | - Vladimir Dyakonov
- Experimental Physics 6 and Würzburg-Dresden Cluster of Excellence, Julius Maximilian University of Würzburg, Würzburg, Germany.
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20
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Acunha TV, Victória HFV, Krambrock K, Marques AC, Costa LAS, Iglesias BA. Photophysical and electrochemical properties of two trans-A2B-corroles: differences between phenyl or pyrenyl groups at the meso-10 position. Phys Chem Chem Phys 2020; 22:16965-16977. [DOI: 10.1039/d0cp02364g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The photophysical properties of two meso–trans-A2B-type corroles containing phenyl or pyrenyl units were reported in this study. TD-DFT calculations and electrochemical analysis were conducted to better understand the corrole molecular structures.
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Affiliation(s)
- Thiago V. Acunha
- Laboratório de Bioinorgânica e Materiais Porfirínicos
- Departamento de Química
- Universidade Federal de Santa Maria – UFSM
- 97105-900 Santa Maria
- Brazil
| | - Henrique F. V. Victória
- Instituto de Ciências Exatas
- Departamento de Física
- Universidade Federal de Minas Gerais
- Belo Horizonte
- Brazil
| | - Klaus Krambrock
- Instituto de Ciências Exatas
- Departamento de Física
- Universidade Federal de Minas Gerais
- Belo Horizonte
- Brazil
| | - Amanda C. Marques
- NEQC – Núcleo de Estudos em Química Computacional
- Departamento de Química
- Universidade Federal de Juiz de Fora – UFJF
- Juiz de Fora
- Brazil
| | - Luiz Antônio S. Costa
- NEQC – Núcleo de Estudos em Química Computacional
- Departamento de Química
- Universidade Federal de Juiz de Fora – UFJF
- Juiz de Fora
- Brazil
| | - Bernardo A. Iglesias
- Laboratório de Bioinorgânica e Materiais Porfirínicos
- Departamento de Química
- Universidade Federal de Santa Maria – UFSM
- 97105-900 Santa Maria
- Brazil
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21
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Leonel AG, Mansur HS, Mansur AA, Caires A, Carvalho SM, Krambrock K, Outon LEF, Ardisson JD. Synthesis and characterization of iron oxide nanoparticles/carboxymethyl cellulose core-shell nanohybrids for killing cancer cells in vitro. Int J Biol Macromol 2019; 132:677-691. [DOI: 10.1016/j.ijbiomac.2019.04.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/22/2019] [Accepted: 04/02/2019] [Indexed: 10/27/2022]
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22
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Cook DS, Kashtiban RJ, Krambrock K, de Lima GM, Stumpf HO, Lara LRS, Ardisson JD, Walton RI. Nanocrystalline Transition-Metal Gallium Oxide Spinels from Acetylacetonate Precursors via Solvothermal Synthesis. Materials (Basel) 2019; 12:ma12050838. [PMID: 30871072 PMCID: PMC6427303 DOI: 10.3390/ma12050838] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 02/27/2019] [Accepted: 03/06/2019] [Indexed: 11/18/2022]
Abstract
The synthesis of mixed-metal spinels based on substituted γ-Ga2O3 is reported using metal acetylacetonate precursors in solvothermal reactions with alcohols as solvents at 240 °C. New oxides of Cr, Mn and Fe have been produced, all of which are formed as nanocrystalline powders, as seen by high-resolution transmission electron microscopy (HR-TEM). The first chromium-gallium mixed oxide is thus formed, with composition 0.33Ga1.87Cr0.8O4 ( = vacant site). X-ray absorption near-edge spectroscopy (XANES) at the chromium K-edge shows the presence of solely octahedral Cr3+, which in turn implies a mixture of tetrahedral and octahedral Ga3+, and the material is stable on annealing to at least 850 °C. An analogous manganese material with average chemical composition close to MnGa2O4 is shown to contain octahedral Mn2+, along with some Mn3+, but a different inversion factor to materials reported by conventional solid-state synthesis in the literature, which are known to have a significant proportion of tetrahedral Mn2+. In the case of iron, higher amounts of the transition metal can be included to give an Fe:Ga ratio of 1:1. Elemental mapping using energy dispersive X-ray spectroscopy on the TEM, however, reveals inhomogeneity in the distribution of the two metals. This is consistent with variable temperature 57Fe Mössbauer spectroscopy that shows the presence of Fe2+ and Fe3+ in more than one phase in the sample. Variable temperature magnetisation and electron paramagnetic resonance (EPR) indicate the presence of superparamagnetism at room temperature in the iron-gallium oxides.
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Affiliation(s)
- Daniel S Cook
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
| | - Reza J Kashtiban
- Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
| | - Klaus Krambrock
- Departamento de Física, Universidade Federal de Minas Gerais, UFMG, Avenida Antônio Carlos 6627, Belo Horizonte MG, CEP 31270-901, Brazil.
| | - Geraldo M de Lima
- Departamento de Química, Universidade Federal de Minas Gerais, UFMG, Avenida Antônio Carlos 6627, Belo Horizonte MG, CEP 31270-901, Brazil.
| | - Humberto O Stumpf
- Departamento de Química, Universidade Federal de Minas Gerais, UFMG, Avenida Antônio Carlos 6627, Belo Horizonte MG, CEP 31270-901, Brazil.
| | - Luciano R S Lara
- Departamento de Química, Universidade Federal de Minas Gerais, UFMG, Avenida Antônio Carlos 6627, Belo Horizonte MG, CEP 31270-901, Brazil.
| | - José D Ardisson
- Centro de Desenvolvimento em Tecnologia Nuclear, CDTN/CNEN, Avenida Antônio Carlos 6627, Belo Horizonte MG, CEP 31270-901, Brazil.
| | - Richard I Walton
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK.
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23
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de Souza ÍP, Machado BDP, de Carvalho AB, Binatti I, Krambrock K, Molphy Z, Kellett A, Pereira-Maia EC, Silva-Caldeira PP. Exploring the DNA binding, oxidative cleavage, and cytotoxic properties of new ternary copper(II) compounds containing 4-aminoantipyrine and N,N-heterocyclic co-ligands. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.10.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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24
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Carvalho SM, Leonel AG, Mansur AAP, Carvalho IC, Krambrock K, Mansur HS. Bifunctional magnetopolymersomes of iron oxide nanoparticles and carboxymethylcellulose conjugated with doxorubicin for hyperthermo-chemotherapy of brain cancer cells. Biomater Sci 2019; 7:2102-2122. [DOI: 10.1039/c8bm01528g] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Magnetopolymersomes for potential multimodal brain cancer therapy – “nanoheaters meet drug nanocarriers”.
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Affiliation(s)
- Sandhra M. Carvalho
- Center of Nanoscience
- Nanotechnology and Innovation – CeNano2I
- Federal University of Minas Gerais – UFMG
- 6627 – Belo Horizonte/MG
- Brazil
| | - Alice G. Leonel
- Center of Nanoscience
- Nanotechnology and Innovation – CeNano2I
- Federal University of Minas Gerais – UFMG
- 6627 – Belo Horizonte/MG
- Brazil
| | - Alexandra A. P. Mansur
- Center of Nanoscience
- Nanotechnology and Innovation – CeNano2I
- Federal University of Minas Gerais – UFMG
- 6627 – Belo Horizonte/MG
- Brazil
| | - Isadora C. Carvalho
- Center of Nanoscience
- Nanotechnology and Innovation – CeNano2I
- Federal University of Minas Gerais – UFMG
- 6627 – Belo Horizonte/MG
- Brazil
| | - Klaus Krambrock
- Department of Physics
- Federal University of Minas Gerais
- Brazil
| | - Herman S. Mansur
- Center of Nanoscience
- Nanotechnology and Innovation – CeNano2I
- Federal University of Minas Gerais – UFMG
- 6627 – Belo Horizonte/MG
- Brazil
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25
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de Carvalho AB, de Souza ÍP, de Andrade LM, Binatti I, Pedroso EF, Krambrock K, Oliveira WX, Pereira-Maia EC, Silva-Caldeira PP. Novel copper(II) coordination polymer containing the drugs nalidixic acid and 8-hydroxyquinoline: Evaluation of the structural, magnetic, electronic, and antitumor properties. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.09.046] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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26
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Habran M, Pontón PI, Mancic L, Pandoli O, Krambrock K, da Costa MEHM, Letichevsky S, Costa AM, Morgado E, Marinkovic BA. Visible light sensitive mesoporous nanohybrids of lepidocrocite-like ferrititanate coupled to a charge transfer complex: Synthesis, characterization and photocatalytic degradation of NO. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.07.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Escobar LB, Corrêa CC, Ferreira DC, Krambrock K, Diniz R, Machado FC. Synthesis, crystal structure and EPR studies of two coordination compounds containing the 2,2-dicyano-1-ethoxyethenolate anion. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.12.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Vignoli Muniz GS, Incio JL, Alves OC, Krambrock K, Teixeira LR, Louro SRW. Fluorescence and electron paramagnetic resonance studies of norfloxacin and N-donor mixed-ligand ternary copper(II) complexes: Stability and interaction with SDS micelles. Spectrochim Acta A Mol Biomol Spectrosc 2018; 189:133-138. [PMID: 28806698 DOI: 10.1016/j.saa.2017.08.013] [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] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 07/26/2017] [Accepted: 08/04/2017] [Indexed: 06/07/2023]
Abstract
The stability of ternary copper(II) complexes of a heterocyclic ligand, L (L being 2,2'-bipyridine (bipy) or 1,10-phenanthroline (phen)) and the fluorescent antibacterial agent norfloxacin (NFX) as the second ligand was studied at pH7.4 and different ionic strengths. Fluorescence quenching upon titration of NFX with the binary complexes allowed to obtain stability constants for NFX binding, Kb, as a function of ionic strength. The Kb values vary by more than two orders of magnitude when buffer concentration varies from 0.5 to 100mM. It was observed that previously synthesized ternary complexes dissociate in buffer according with the obtained stability constants. This shows that equimolar solutions of NFX and binary complexes are equivalent to solutions of synthesized ternary complexes. The interaction of the ternary copper complexes with anionic SDS (sodium dodecyl sulfate) micelles was studied by fluorescence and electron paramagnetic resonance (EPR). Titration of NFX-loaded SDS micelles with the complexes Cu:L allowed to determine the stability constants inside the micelles. Fluorescence quenching demonstrated that SDS micelles increase the stability constants by factors around 50. EPR spectra gave details of the copper(II) local environment, and demonstrated that the structure of the ternary complexes inside SDS micelles is different from that in buffer. Mononuclear ternary complexes formed inside the micelles, while in buffer most ternary complexes are binuclear. The results show that anionic membrane interfaces increase formation of copper fluoroquinolone complexes, which can influence bioavailability, membrane diffusion, and mechanism of action of the antibiotics.
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Affiliation(s)
- Gabriel S Vignoli Muniz
- Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, RJ 22451-900, Brazil
| | - Jimmy Llontop Incio
- Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, RJ 22451-900, Brazil
| | - Odivaldo C Alves
- Departamento de Físico-Química, Instituto de Química, Universidade Federal Fluminense, Niterói, RJ 24020-150, Brazil
| | - Klaus Krambrock
- Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Letícia R Teixeira
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Sonia R W Louro
- Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Rio de Janeiro, RJ 22451-900, Brazil.
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29
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Scaldini FM, Ramalho Freitas MC, De Souza Reis M, Yoshida MI, Krambrock K, Machado FC. A Co(ii) 1D coordination polymer constructed from 1,3-bisbenzyl-2-oxoimidazoline-4,5-dicarboxylic acid: crystal structure and magnetic properties. NEW J CHEM 2018. [DOI: 10.1039/c7nj04564f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new complex involving 1,3-bisbenzyl-2-oxoimidazoline-4,5-dicarboxylic acid (H2L) and a cobalt(ii) metal ion designated [Co(L)(H2O)2]n has been synthesized under solvothermal conditions and characterized.
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Affiliation(s)
- Felipe Mageste Scaldini
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Juiz de Fora
- Juiz de Fora-MG
- Brazil
| | | | | | - Maria Irene Yoshida
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Klaus Krambrock
- Departamento de Física
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Flávia Cavalieri Machado
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Juiz de Fora
- Juiz de Fora-MG
- Brazil
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30
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Habran M, Krambrock K, Maia da Costa MEH, Morgado E, Marinkovic BA. TiO 2 anatase nanorods with non-equilibrium crystallographic {001} facets and their coatings exhibiting high photo-oxidation of NO gas. Environ Technol 2018; 39:231-239. [PMID: 28274191 DOI: 10.1080/09593330.2017.1297852] [Citation(s) in RCA: 1] [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: 09/29/2016] [Accepted: 02/16/2017] [Indexed: 06/06/2023]
Abstract
Development of highly active photocatalysts is mandatory for more widespread application of this alternative environmental technology. Synthesis of photocatalysts, such as anatase TiO2, with more reactive, non-equilibrium, crystallographic facets is theoretically justified by a more efficient interfacial charge transfer to reactive adsorbed species, increasing quantum efficiency of photocatalyst. Air and vacuum calcinations of protonated trititanate nanotubes lead to their transformation to anatase nanorods. The nanorods synthesized by air calcination demonstrate photo-oxidation of NO gas more than three times superior to the one presented by the benchmark P-25 photocatalyst. This performance has been explained in terms of 50% higher specific surface area and, more importantly, through the predominance of more reactive, non-equilibrium, {001} crystallographic facets of the anatase nanorods. These facets present a high density of undercoordinated Ti cations, which favors adsorption of reactant species, and strained Ti-O-Ti bonds, leading to more efficient photo-oxidation reactions. Reduced Ti species, such as Ti3+, were not observed in the as-obtained nanorods, while reactive adsorbed molecules are scarce on the nanorods obtained through vacuum calcination. Dip-coating of TiO2 anatase nanorods (air calcined) over soda-lime glass plates was used to prepare visible light transparent, superhydrophilic and highly adherent photocatalytic coatings with homogenously distributed nanopores.
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Affiliation(s)
- Margarita Habran
- a Department of Chemical and Materials Engineering , Pontifical Catholic University of Rio de Janeiro , Rio de Janeiro , Brazil
| | - Klaus Krambrock
- b Department of Physics , Federal University of Minas Gerais , Belo Horizonte , Brazil
| | - M E H Maia da Costa
- c Department of Physics , Pontifical Catholic University of Rio de Janeiro , Rio de Janeiro , Brazil
| | - Edisson Morgado
- d PETROBRAS S.A., Research & Development Centre , Rio de Janeiro , Brazil
| | - Bojan A Marinkovic
- a Department of Chemical and Materials Engineering , Pontifical Catholic University of Rio de Janeiro , Rio de Janeiro , Brazil
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31
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Suárez DF, Monteiro APF, Ferreira DC, Brandão FD, Krambrock K, Modolo LV, Cortés ME, Sinisterra RD. Efficient antibacterial nanosponges based on ZnO nanoparticles and doxycycline. J Photochem Photobiol B 2017; 177:85-94. [PMID: 29107206 DOI: 10.1016/j.jphotobiol.2017.10.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 10/15/2017] [Accepted: 10/17/2017] [Indexed: 11/26/2022]
Abstract
Bacterial soft rot is responsible for the loss of about 25% of worldwide production in vegetables and fruits. Efforts have been made to develop an effective nanosponge with the capacity to load and release antibacterial drugs to protect plants. Based on the potential of the ZnO nanoparticles (ZnO-NPs) to achieve this goal, this study synthesized NP via the sol-gel and hydrothermal methods by controlling native defects, such as oxygen vacancies, using thermal treatments and reduced atmospheres. To characterize the ZnO NPs, X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), optical spectroscopy, electron paramagnetic resonance (EPR), Zeta Potential measurements and surface area with the Brunauer-Emmett-Teller (BET) method were used. The photophysical and photochemical properties via spin trapping method aligned with EPR using UVA light showed a greater formation of electron-hole pairs and hydroxyl radicals for the reduced ZnO NPs when compared with the oxidized ones. Additionally, we found that reduced ZnO-NPs have high effectively against Escherichia coli, Erwinia carotovora and Pantoea sp. bacteria using the photocatalytic effect in the UV range. Moreover, ZnO-NPs loaded with DOX release profile enables the release of DOX within 46days, where 25% was released during the first 10h followed by a second delivery phase with an interesting short-term efficacy (<1day) against E. carotovora and Pantoea sp. Bacteria. For the first time, it was demonstrated that ZnO-NPs and ZnO-NPs loaded with DOX have efficient UV photocatalytic activities against bacterial soft rot infections.
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Affiliation(s)
- Diego F Suárez
- Chemistry Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil
| | - Ana P F Monteiro
- Chemistry Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil
| | - Daniele C Ferreira
- Physics Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil
| | - Frederico D Brandão
- Physics Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil
| | - Klaus Krambrock
- Physics Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil
| | - Luzia V Modolo
- Department of Botany, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil
| | - Maria E Cortés
- Restorative Dentistry Department, Faculty of Dentistry, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil
| | - Rubén D Sinisterra
- Chemistry Department, Universidade Federal de Minas Gerais, Belo Horizonte, MG CEP: 31270-901, Brazil.
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32
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Gerolis LGL, Lameiras FS, Krambrock K, Neves MJ. Effect of gamma radiation on antioxidant capacity of green tea, yerba mate, and chamomile tea as evaluated by different methods. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2016.08.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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33
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Oliveira WX, Pereira CL, Pinheiro CB, Krambrock K, Grancha T, Moliner N, Lloret F, Julve M. Oxotris(oxalato)niobate(V) as counterion in cobalt(II) spin-crossover systems. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.07.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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34
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Arifa RDN, Paula TPD, Madeira MFM, Lima RL, Garcia ZM, Ÿvila TV, Pinho V, Barcelos LS, Pinheiro MVB, Ladeira LO, Krambrock K, Teixeira MM, Souza DG. The reduction of oxidative stress by nanocomposite Fullerol decreases mucositis severity and reverts leukopenia induced by Irinotecan. Pharmacol Res 2016; 107:102-110. [PMID: 26987941 DOI: 10.1016/j.phrs.2016.03.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 03/01/2016] [Accepted: 03/07/2016] [Indexed: 12/20/2022]
Abstract
Irinotecan is a useful chemotherapeutic agent for the treatment of several solid tumors. However, this therapy is associated with side effects, including leukopenia and mucositis. Reactive oxygen species (ROS) activate inflammatory pathways and contribute to Irinotecan-induced mucositis. Fullerol is a nanocomposite with anti-oxidant properties that may reduce tissue damage after inflammatory stimuli. In this paper, the effects of Fullerol and mechanisms of protection were investigated in a model of Irinotecan-induced mucositis. Mucositis was induced by an injection of Irinotecan per 4 days in C57BL/6. Fullerol or a vehicle was injected every 12h. On day 7, the intestines were removed to evaluate histological changes, leukocyte influx, and the production of cytokines and ROS. Irinotecan therapy resulted in weight loss, an increased clinical score and intestinal injury. Treatment with Fullerol attenuated weight loss, decreased clinical score and intestinal damage. Irinotecan also induced increased ROS production in enterocytes, oxidative stress, IL-1β production, neutrophil and eosinophil influx in the ileum. Fullerol treatment decreased production of ROS in the enterocytes, oxidative stress, IL-1β production, neutrophil and eosinophil influx in the ileum. Irinotecan therapy also induced leukopenia in an ROS-dependent manner because leukopenia reverted in WT mice treated with Fullerol or Apocynin or in Gp91phox(-/-) mice. Mice treated with Irinotecan presented less melanoma tumor growth compared to the control group. Fullerol does not interfere in the anti-tumor action of Irinotecan. Fullerol has a great pharmacology potential to decreases the severity of mucositis and of leukopenia during chemotherapy treatment.
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Affiliation(s)
- Raquel Duque Nascimento Arifa
- Laboratório Interação Micro-organismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil
| | - Talles Prosperi de Paula
- Laboratório Interação Micro-organismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil
| | - Mila Fernandes Moreira Madeira
- Laboratório Interação Micro-organismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil
| | - Renata Lacerda Lima
- Laboratório Interação Micro-organismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil
| | - Zélia Menezes Garcia
- Laboratório Interação Micro-organismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil
| | - Thiago Vinícius Ÿvila
- Laboratório Interação Micro-organismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil
| | - Vanessa Pinho
- Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil; Núcleo de Estudos em Inflamação, Departamento de Morfologia, Belo Horizonte, MG, Brazil
| | - Lucíola Silva Barcelos
- Laboratório de Angiogênese, Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Belo Horizonte, MG, Brazil
| | | | - Luiz Orlando Ladeira
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Klaus Krambrock
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Mauro Martins Teixeira
- Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil
| | - Danielle Glória Souza
- Laboratório Interação Micro-organismo Hospedeiro, Departamento de Microbiologia, Belo Horizonte, MG, Brazil; Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Belo Horizonte, MG, Brazil.
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35
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Monteiro CS, Ferreira DC, Sáfar GAM, Gontijo RN, Fantini C, Martins DCS, Idemori YM, Pinheiro MVB, Krambrock K. Unravelling the mechanisms of reactive oxygen species formation in nanohybrid systems of porphyrins and enriched (6,5) single-walled carbon nanotubes for photosensitization. Phys Chem Chem Phys 2016; 18:20459-65. [DOI: 10.1039/c6cp03366k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two different porphyrins inside the exciton volume of a carbon nanotube with charged N either in or out.
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Affiliation(s)
- Camila S. Monteiro
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Daniele C. Ferreira
- Departamento de Física
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Gustavo A. M. Sáfar
- Departamento de Física
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Rafael N. Gontijo
- Departamento de Física
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Cristiano Fantini
- Departamento de Física
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Dayse C. S. Martins
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Ynara M. Idemori
- Departamento de Química
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Maurício V. B. Pinheiro
- Departamento de Física
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
| | - Klaus Krambrock
- Departamento de Física
- Instituto de Ciências Exatas
- Universidade Federal de Minas Gerais
- Belo Horizonte-MG
- Brazil
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36
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Souza JS, Krambrock K, Pinheiro MV, Ando RA, Guha S, Alves WA. Visible-light photocatalytic activity of NH 4 NO 3 ion-exchanged nitrogen-doped titanate and TiO 2 nanotubes. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2014.06.036] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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37
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Scaldini FM, Corrêa CC, Yoshida MI, Krambrock K, Machado FC. 2-D coordination polymers of copper and cobalt with 3,4-pyridinedicarboxylic acid: synthesis, characterization, and crystal structures. J COORD CHEM 2014. [DOI: 10.1080/00958972.2014.959002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Felipe M. Scaldini
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil
| | - Charlane C. Corrêa
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil
| | - Maria I. Yoshida
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Klaus Krambrock
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Flávia C. Machado
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil
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38
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Ferreira IP, de Lima GM, Paniago EB, Takahashi JA, Krambrock K, Pinheiro CB, Wardell JL, Visentin LC. Synthesis, characterization, structural and biological aspects of copper(II) dithiocarbamate complexes – Part II, [Cu{S2CN(Me)(R1)}2], [Cu{S2CN(Me)(R2)}2] and [Cu{S2CN(R3)(R4)}2] {R1=CH2CH(OMe)2, R2=2-methyl-1,3-dioxolane, R3=CH2(CH2)2NCHPhOCH2Ph and R4=CH2CH2OH}. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.06.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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39
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Souza MI, Jaques YM, de Andrade GP, Ribeiro AO, da Silva ER, Fileti EE, Ávilla ÉDS, Pinheiro MVB, Krambrock K, Alves WA. Structural and Photophysical Properties of Peptide Micro/Nanotubes Functionalized with Hypericin. J Phys Chem B 2013; 117:2605-14. [DOI: 10.1021/jp3113655] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Márcia I. Souza
- Centro de Ciências Naturais
e Humanas, Universidade Federal do ABC,
09210-170, Santo André, SP, Brazil
| | - Ygor M. Jaques
- Centro de Ciências Naturais
e Humanas, Universidade Federal do ABC,
09210-170, Santo André, SP, Brazil
| | - Gislaine P. de Andrade
- Centro de Ciências Naturais
e Humanas, Universidade Federal do ABC,
09210-170, Santo André, SP, Brazil
| | - Anderson O. Ribeiro
- Centro de Ciências Naturais
e Humanas, Universidade Federal do ABC,
09210-170, Santo André, SP, Brazil
| | - Emerson R. da Silva
- Centro de Ciências Naturais
e Humanas, Universidade Federal do ABC,
09210-170, Santo André, SP, Brazil
| | - Eudes E. Fileti
- Instituto de Ciência
e Tecnologia, Universidade Federal de São Paulo, 12231-280, São José dos Campos, SP, Brazil
| | - Érick de Souza Ávilla
- Departamento de Física,
ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil
| | - Maurício V. B. Pinheiro
- Departamento de Física,
ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil
| | - Klaus Krambrock
- Departamento de Física,
ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil
| | - Wendel A. Alves
- Centro de Ciências Naturais
e Humanas, Universidade Federal do ABC,
09210-170, Santo André, SP, Brazil
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40
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Ribeiro MA, Lanznaster M, Silva MMP, Resende JALC, Pinheiro MVB, Krambrock K, Stumpf HO, Pinheiro CB. Cobalt lawsone complexes: searching for new valence tautomers. Dalton Trans 2013; 42:5462-70. [DOI: 10.1039/c3dt32968b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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de Lima GM, Menezes DC, Cavalcanti CA, dos Santos JA, Ferreira IP, Paniago EB, Wardell JL, Wardell SM, Krambrock K, Mendes IC, Beraldo H. Synthesis, characterisation and biological aspects of copper(II) dithiocarbamate complexes, [Cu{S2CNR(CH2CH2OH)}2], (R=Me, Et, Pr and CH2CH2OH). J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2010.11.048] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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Santos LJ, Gonçalves AS, Krambrock K, Pinheiro MV, Eberlin MN, Vaz BG, de Freitas RP, Alves RB. Synthesis of [60]fullerene derivatives bearing five-membered heterocyclic wings and an investigation of their photophysical kinetic properties. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2010.10.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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43
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Gonçalves R, Pinheiro M, Lacerda R, Ferlauto A, Ladeira L, Krambrock K, Leal A, Viana G, Marques F. New material for low-dose brachytherapy seeds: Xe-doped amorphous carbon films with post-growth neutron activated 125I. Appl Radiat Isot 2011; 69:118-21. [DOI: 10.1016/j.apradiso.2010.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 07/06/2010] [Accepted: 08/09/2010] [Indexed: 11/28/2022]
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44
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Marinho MV, Visentin LDC, de Souza MC, Diniz R, Krambrock K, Yoshida MI, Machado FC. Syntheses, crystal structures and electron paramagnetic resonance studies of CoII- and MnII-coordination polymers with the twisted ligand di(4-pyridyl)disulfide in double bridge fashion. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.06.004] [Citation(s) in RCA: 6] [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: 10/19/2022]
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45
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Farani RDA, Teles WM, Pinheiro CB, Guedes KJ, Krambrock K, Yoshida MI, de Oliveira LFC, Machado FC. Spectroscopic and structural analyses of the copper(II) 2-D coordination polymer {[Cu2(BPP)4(NCS)4]}n (BPP=1,3-bis(4-pyridyl)propane) comprising interpenetrated layers of (4,4) topology. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2007.10.018] [Citation(s) in RCA: 20] [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: 11/29/2022]
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46
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de Faria DM, Yoshida MI, Pinheiro CB, Guedes KJ, Krambrock K, Diniz R, de Oliveira LFC, Machado FC. Preparation, crystal structures and spectroscopic characterization of oxalate copper(II) complexes containing the nitrogen ligands 4,4′-dimethyl-2,2′-bipyridine and di(2-pyridyl)sulfide. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.06.027] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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47
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Teles WM, Marinho MV, Yoshida MI, Speziali NL, Krambrock K, Pinheiro CB, Pinhal NM, Leitão AA, Machado FC. Mono- and binuclear copper(II) complexes containing di(2-pyridyl)sulfide (DPS) as chelating ligand: Spectroscopic characterization and crystal structures of [Cu(DPS)(H2O)Cl2]·H2O and [{Cu(DPS)Cl}2μ-(Cl)2]. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.07.072] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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48
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Alves GC, Ladeira LO, Righi A, Krambrock K, Calado HD, Gil RPDF, Pinheiro MVB. Synthesis of C60(OH)18-20 in aqueous alkaline solution under O2-atmosphere. J BRAZIL CHEM SOC 2006. [DOI: 10.1590/s0103-50532006000600017] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [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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49
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da Silva DN, Guedes KJ, Pinheiro MVB, Schweizer S, Spaeth JM, Krambrock K. The O-(Al2) centre in topaz and its relation to the blue colour. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pssc.200460192] [Citation(s) in RCA: 10] [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: 11/06/2022]
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50
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Leal AS, Krambrock K, Guedes K, Rodrigues RR. Ressonância paramagnética eletrônica-RPE aplicada à análise de especiarias irradiadas (com radiação gama). Ciênc Tecnol Aliment 2004. [DOI: 10.1590/s0101-20612004000300022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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