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Amorim CF, Iglesias BA, Pinheiro TR, Lacerda LE, Sokolonski AR, Pedreira BO, Moreira KS, Burgo TAL, Meyer R, Azevedo V, Portela RW. Photodynamic inactivation of different Candida species and inhibition of biofilm formation induced by water-soluble porphyrins. Photodiagnosis Photodyn Ther 2023; 42:103343. [PMID: 36806829 DOI: 10.1016/j.pdpdt.2023.103343] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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: 11/16/2022] [Revised: 02/10/2023] [Accepted: 02/13/2023] [Indexed: 02/22/2023]
Abstract
BACKGROUND Candida spp. is the main fungal genus related to infections in humans, and its treatment has become a challenge due to the production of biofilm and its resistance/multi-resistance profile to conventional antifungals. Antimicrobial photodynamic therapy stands out as a treatment characterized by a broad spectrum of antimicrobial action, being able to induce oxidative stress in pathogens, and porphyrins are photosensitizers with high selectivity to pathogens. Thus, this work aimed to analyze the photoinactivation of different species of Candida by two cationic (4-H2TMeP+ and 3-H2TMeP+) and one anionic (4-H2TPSP‒) porphyrins. MATERIALS AND METHODS Microdilution assays were performed to determine the MIC100, with subsequent determination of MFC100. Determination of oxidative species was done through the use of scavengers, while biofilm morphological features were investigated using the atomic force microscopy. RESULTS Cationic porphyrins were significantly efficient in inactivating Candida albicans and non-albicans species with 100% growth inhibition and fungicidal activity (MFC100/MIC100 ≤ 4.0). The cationic porphyrins were also able to interfere in Candida spp biofilm formation. The photo-oxidative mechanism activated by 3-H2TMeP+ in Candida spp. is concurrent with the production of singlet oxygen and oxygen radical species. In the AFM analysis, 3-H2TMeP+ was able to reduce yeast adhesion to the surface. CONCLUSIONS Cationic porphyrins can photo-inactivate different species of Candida in both planktonic and biofilm-associated forms, and reduce the adhesion of these fungi to the surface.
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Affiliation(s)
- Carolina Ferreira Amorim
- Laboratory of Immunology and Molecular Biology, Health Sciences Institute, Universidade Federal da Bahia, Salvador, Bahia State 40110-100, Brazil
| | - Bernardo Almeida Iglesias
- Bioinorganic and Porphyrinoid Materials Laboratory, Department of Chemistry, Universidade Federal de Santa Maria, Rio Grande do Sul State, Santa Maria 97105-900, Brazil.
| | - Ticiane Rosa Pinheiro
- Bioinorganic and Porphyrinoid Materials Laboratory, Department of Chemistry, Universidade Federal de Santa Maria, Rio Grande do Sul State, Santa Maria 97105-900, Brazil
| | - Luiz Eduardo Lacerda
- Laboratory of Immunology and Molecular Biology, Health Sciences Institute, Universidade Federal da Bahia, Salvador, Bahia State 40110-100, Brazil
| | - Ana Rita Sokolonski
- Laboratory of Oral Biochemistry, Health Sciences Institute, Universidade Federal da Bahia, Salvador, Bahia State 40110-100, Brazil
| | - Beatriz Oliveira Pedreira
- Laboratory of Immunology and Molecular Biology, Health Sciences Institute, Universidade Federal da Bahia, Salvador, Bahia State 40110-100, Brazil
| | - Kelly Schneider Moreira
- Coulomb Electrostatic and Mechanochemistry Laboratory, Universidade Federal de Santa Maria, Rio Grande do Sul State, Santa Maria 97105-900, Brazil
| | - Thiago Augusto Lima Burgo
- Coulomb Electrostatic and Mechanochemistry Laboratory, Universidade Federal de Santa Maria, Rio Grande do Sul State, Santa Maria 97105-900, Brazil
| | - Roberto Meyer
- Laboratory of Immunology and Molecular Biology, Health Sciences Institute, Universidade Federal da Bahia, Salvador, Bahia State 40110-100, Brazil
| | - Vasco Azevedo
- Laboratory of Cellular and Molecular Genetics, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais State 31270-901, Brazil
| | - Ricardo Wagner Portela
- Laboratory of Immunology and Molecular Biology, Health Sciences Institute, Universidade Federal da Bahia, Salvador, Bahia State 40110-100, Brazil.
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Siqueira FDS, Siqueira JD, Denardi LB, Moreira KS, Lima Burgo TA, de Lourenço Marques L, Machado AK, Davidson CB, Chaves OA, Anraku de Campos MM, Back DF. Antibacterial, antifungal, and anti-biofilm effects of sulfamethoxazole-complexes against pulmonary infection agents. Microb Pathog 2023; 175:105960. [PMID: 36587926 DOI: 10.1016/j.micpath.2022.105960] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 08/02/2022] [Revised: 12/22/2022] [Accepted: 12/22/2022] [Indexed: 12/31/2022]
Abstract
Antibiotic resistance associated with pulmonary infection agents has become a public health problem, being considered one of the main priorities for immediate resolution. Thus, to increase the therapeutic options in the fight against resistant microorganisms, the synthesis of molecules from pre-existing drugs has shown to be a promising alternative. In this sense, the present work reports the synthesis, characterization, and biological evaluation (against fungal and bacterial agents that cause lung infections) of potential metallodrugs based on sulfamethoxazole complexed with AuI, AgI, HgII, CdII, NiII, and CuII. The minimal inhibitory concentration (MIC) value was used to evaluate the antifungal and antibacterial properties of the compounds. In addition, it was also evaluated the antibiofilm capacity in Pseudomonas aeruginosa, through the quantification of its biomass and visualization using atomic force microscopy. For each case, molecular docking calculations were carried out to suggest the possible biological target of the assayed inorganic complexes. Our results indicated that the novel inorganic complexes are better antibacterial and antifungal than the commercial antibiotic sulfamethoxazole, highlighting the AgI-complex, which was able to inhibit the growth of microorganisms that cause lung diseases with concentrations in the 2-8 μg mL-1 range, probably at targeting dihydropteroate synthetase - a key enzyme involved in the folate synthesis. Furthermore, sulfamethoxazole complexes were able to inhibit the formation of bacterial biofilms at significantly lower concentrations than free sulfamethoxazole, probably mainly targeting the active site of LysR-type transcriptional regulator (PqsR). Overall, the present study reports preliminary results that demonstrate the derivatization of sulfamethoxazole with transition metal cations to obtain potential metallodrugs with applications as antimicrobial and antifungal against pulmonary infections, being an alternative for drug-resistant strains.
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Affiliation(s)
- Fallon Dos Santos Siqueira
- Mycobacteriology Laboratory, Graduate Program in Pharmaceutical Sciences, Department of Clinical and Toxicological Analysis, Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil
| | - Josiéli Demetrio Siqueira
- Inorganic Materials Laboratory, Graduate Program in Chemistry, Department of Chemistry Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil
| | - Laura Bedin Denardi
- Mycobacteriology Laboratory, Graduate Program in Pharmaceutical Sciences, Department of Clinical and Toxicological Analysis, Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil
| | - Kelly Schneider Moreira
- Coulomb Electrostatic and Mechanochemical Laboratory, Graduate Program in Chemistry, Department of Chemistry, Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil
| | - Thiago Augusto Lima Burgo
- Coulomb Electrostatic and Mechanochemical Laboratory, Graduate Program in Chemistry, Department of Chemistry, Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil
| | - Lenice de Lourenço Marques
- Inorganic Materials Laboratory, Graduate Program in Chemistry, Department of Chemistry Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil
| | - Alencar Kolinski Machado
- Laboratory of Genetics and Cell Culture, Graduate Program in Nanosciences, Franciscan University, Andradas' Street, 1614, zip code:, 97010-032, Santa Maria, Brazil
| | - Carolina Bordin Davidson
- Laboratory of Genetics and Cell Culture, Graduate Program in Nanosciences, Franciscan University, Andradas' Street, 1614, zip code:, 97010-032, Santa Maria, Brazil
| | - Otávio Augusto Chaves
- Coimbra Chemistry Center - Institute of Molecular Sciences (CQC-IMS), Faculty of Science and Technology, Department of Chemistry, University of Coimbra, Rua Larga, 3004-535, Coimbra, Portugal
| | - Marli Matiko Anraku de Campos
- Mycobacteriology Laboratory, Graduate Program in Pharmaceutical Sciences, Department of Clinical and Toxicological Analysis, Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil.
| | - Davi Fernando Back
- Inorganic Materials Laboratory, Graduate Program in Chemistry, Department of Chemistry Federal University of Santa Maria, Roraima Avenue 1000, zip code:, 97105-900, Santa Maria, Brazil.
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Urquhart CG, Pinheiro TDR, da Silva JLG, Leal DBR, Burgo TAL, Iglesias BA, Santos RCV. Antimicrobial activity of water-soluble tetra-cationic porphyrins on Pseudomonas aeruginosa. Photodiagnosis Photodyn Ther 2022; 42:103266. [PMID: 36587859 DOI: 10.1016/j.pdpdt.2022.103266] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 12/12/2022] [Accepted: 12/28/2022] [Indexed: 12/30/2022]
Abstract
This manuscript presents the cytotoxicity, antimicrobial activity, antibiofilm preliminary properties, and associated therapy with commercial drugs using water-soluble tetra-cationic porphyrins against Pseudomonas aeruginosa. Two commercial tetra-cationic porphyrins were tested against a standard strain of P. aeruginosa 01 (PA01) in antibacterial activity assays under dark conditions and irradiated with white light for 120 min. Porphyrin 4-H2TMePor showed better antimicrobial activity and was chosen for further tests. Increased minimum inhibitory concentration was observed in the presence of reactive oxygen species, suggesting that photooxidation was mediated by the singlet oxygen production. In the time-kill curve assay, 4-H2TMePor inhibited bacterial growth in 90 min of irradiation. The checkerboard assay revealed synergistic interactions. Biofilms of the standard PA01 strain and three clinical isolates were formed. The biofilm destruction assay was more efficient for PA01, significantly reducing the biofilm biomass formed compared to the positive control. The associated treatment to destroy the biofilm potentiated a significant decrease in the biofilm biomass compared to the positive control. The photosensitizer did not damage human keratinocytes or mouse fibroblasts in the cytotoxicity assays, demonstrating the safety of using 4-H2TMePor. Atomic force microscopy indicated lower adhesion force, higher cell wall deformation, and higher dissipation energy in the treated control compared to untreated PA01. Given our findings, it is evident that water-soluble tetra-cationic porphyrins have excellent antimicrobial and a preliminary antibiofilm activity against Gram-negative bacteria, proving to be a potential photosensitizer for clinical use.
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Affiliation(s)
- Carolina Gonzalez Urquhart
- Programa de Pós-Graduação em Ciências Farmacêuticas, Centro de Ciências da Saúde, Departamento de Microbiologia e Parasitologia (LAPEMICRO), Universidade Federal de Santa Maria, RS, Brazil
| | - Ticiane da Rosa Pinheiro
- Programa de Pós-Graduação em Ciências Farmacêuticas, Centro de Ciências da Saúde, Departamento de Microbiologia e Parasitologia (LAPEMICRO), Universidade Federal de Santa Maria, RS, Brazil
| | - Jean Lucas Gutknecht da Silva
- Laboratório de Imunologia Experimental e Aplicada (LABIBIO), Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil
| | - Daniela Bitencourt Rosa Leal
- Laboratório de Imunologia Experimental e Aplicada (LABIBIO), Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil
| | - Thiago Augusto Lima Burgo
- Department of Chemistry and Environmental Sciences, Ibilce, Sao Paulo State University (Unesp), R. Cristovao Colombo, 2265, S. J. Rio Preto, SP 15014-100, Brazil
| | - Bernardo Almeida Iglesias
- Laboratório de Bioinorgânica e Materiais Porfirínicos (LBMP), Departamento de Química, Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.
| | - Roberto Christ Vianna Santos
- Programa de Pós-Graduação em Ciências Farmacêuticas, Centro de Ciências da Saúde, Departamento de Microbiologia e Parasitologia (LAPEMICRO), Universidade Federal de Santa Maria, RS, Brazil.
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Aragonez GC, Pilecco RO, Dapieve KS, Burgo TAL, Guilardi LF, Prochnow C, Valandro LF, Rippe MP. Simulation of CAD/CAM milling on lithium disilicate: Mechanical and topographic analyses of surface grinding different protocols. J Mech Behav Biomed Mater 2022; 132:105278. [PMID: 35653917 DOI: 10.1016/j.jmbbm.2022.105278] [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: 03/22/2022] [Revised: 05/14/2022] [Accepted: 05/17/2022] [Indexed: 10/18/2022]
Abstract
The aim of this study was to evaluate the topography and the fatigue performance of lithium disilicate glass-ceramic after surface grinding through different laboratory protocols used to simulate the Computer-aided design/Computer-aided manufacturing (CAD/CAM) milling. Ceramic discs (IPS e.max CAD, Ø = 13.5 mm × 1.2 mm of thickness) were produced through different methodologies: milling in CAD/CAM system (CAD/CAM group); produced in-lab with a polished surface (POL group); or produced through in-lab methods and randomly distributed into five groups according to different grinding protocols to simulate the CAD/CAM milling [grinding with a CAD/CAM bur coupled to a mandrel (CAD/CAM Bur group); fine diamond bur using oscillatory movements (DBO group); fine diamond bur in x and y axes of the disc (DBXY group); #60-grit silicon carbide sandpaper (SiC group); and #60-grit wood sandpaper (WS group)]. The specimens were fatigue tested (n = 15) according to the step-stress method (initial load: 60 N; step-size: 20 N; 10,000 cycles/step; 20 Hz frequency). A roughness analysis was performed on all specimens, while fractal dimension (FD) and fractography were performed on representative samples. The Kaplan-Meier analysis showed that the POL (293.3 N) group presented better fatigue performance (higher load and number of cycles for failure) (p < 0.05) than the other groups (CAD/CAM = 222.7 N; CAD/CAM Bur = 181.3 N; DBO = 184.0 N; DBXY = 192.0 N; SiC = 182.6 N; WS = 182.6 N). For roughness, only the SiC (Ra = 1.616; Rz = 10.465) and WS (Ra = 1.673; Rz = 10.655) groups produced statistically similar Ra (μm) and Rz (μm) values to the CAD/CAM (Ra = 1.628; Rz = 9.571) group (p > 0.05). The surface created by CAD/CAM milling and POL group exhibited more complexity (FD) higher values than the experimental groups. For the ceramic surface topography images, the CAD/CAM milling visibly produced a uniform surface compared to the other groups; however, the POL group was the smoothest. The DBO, DBXY, SiC, and WS groups resulted in similar characteristics of surface topography. Therefore, although the SiC and WS groups showed similar roughness to the control group (CAD/CAM), no in-lab simulation method was fully capable to mimic the mechanical performance of the CAD/CAM-milled lithium disilicate glass-ceramic.
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Affiliation(s)
- Gabriela Carrão Aragonez
- MSciD and PhD Graduate Programs in Oral Science - Prosthodontic Units, Faculty of Odontology, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Rafaela Oliveira Pilecco
- MSciD and PhD Graduate Programs in Oral Science - Prosthodontic Units, Faculty of Odontology, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Kiara Serafini Dapieve
- MSciD and PhD Graduate Programs in Oral Science - Prosthodontic Units, Faculty of Odontology, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Thiago Augusto Lima Burgo
- Department of Physics, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Luís Felipe Guilardi
- MSciD and PhD Graduate Programs in Oral Science - Prosthodontic Units, Faculty of Odontology, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Catina Prochnow
- MSciD and PhD Graduate Programs in Oral Science - Prosthodontic Units, Faculty of Odontology, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Luiz Felipe Valandro
- MSciD and PhD Graduate Programs in Oral Science - Prosthodontic Units, Faculty of Odontology, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
| | - Marília Pivetta Rippe
- MSciD and PhD Graduate Programs in Oral Science - Prosthodontic Units, Faculty of Odontology, Federal University of Santa Maria - UFSM, Santa Maria, Rio Grande do Sul State, Brazil.
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Guterres KB, Rossi GG, de Campos MMA, Moreira KS, Burgo TAL, Iglesias BA. Nanomolar effective and first report of tetra-cationic silver(II) porphyrins against non-tuberculous mycobacteria in antimicrobial photodynamic approaches. Photodiagnosis Photodyn Ther 2022; 38:102770. [DOI: 10.1016/j.pdpdt.2022.102770] [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: 11/22/2021] [Revised: 01/14/2022] [Accepted: 02/16/2022] [Indexed: 10/19/2022]
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Rossi GG, Guterres KB, Moreira KS, Burgo TAL, de Campos MMA, Iglesias BA. Photo-damage promoted by tetra-cationic palladium(II) porphyrins in rapidly growing mycobacteria. Photodiagnosis Photodyn Ther 2021; 36:102514. [PMID: 34481062 DOI: 10.1016/j.pdpdt.2021.102514] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/20/2021] [Accepted: 08/27/2021] [Indexed: 12/13/2022]
Abstract
Antimicrobial photodynamic therapy (aPDT) has gained prominence in microbiology, especially in treating non-invasive infections. Diseases such as mycobacteriosis, which causes localized infections and has a slow treatment, tend to be future targets for this type of technology. Therefore, this study aimed to explore the action of two isomeric Pd(II)-porphyrins on fast-growing mycobacterial strains (RGM). Tetra-cationic porphyrins (4-PdTPyP and 3-PdTPyP) were synthesized and applied against standard strains of Mycobacteroides abscessus subsp. abscessus (ATCC 19977), Mycolicibacterium fortuitum (ATCC 6841), Mycolicibacterium smegmatis (ATCC 700084), and Mycobacteroides abscessus subsp. massiliense (ATCC 48898). Reactive oxygen species (ROS) scavengers were used in an attempt to determine possible ROS produced by the photosensitizers (PS) under study. Moreover, the impact of porphyrin on the mycobacterial surface was further evaluated by atomic force microscopy (AFM), and we observed significant damage on cells walls and altered nanomechanical and electrostatic adhesion properties. The results presented herein show that the positively charged porphyrin at the meta position (3-PdTPyP) was the most efficient PS against the RGM strains, and its bactericidal activity was proven in two irradiation sessions, with singlet oxygen species being the main ROS involved in this process. This study demonstrated the therapeutic potential of porphyrins, especially the 3-PdTPyP derivative.
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Affiliation(s)
- Grazille Guidolin Rossi
- Laboratory of Mycobacteriology, Universidade Federal de Santa Maria, Av. Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil
| | - Kevim Bordignon Guterres
- Laboratory of Mycobacteriology, Universidade Federal de Santa Maria, Av. Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil
| | - Kelly Schneider Moreira
- Coulomb Electrostatic and Mechanochemistry Laboratory, Universidade Federal de Santa Maria, Av. Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil
| | - Thiago Augusto Lima Burgo
- Coulomb Electrostatic and Mechanochemistry Laboratory, Universidade Federal de Santa Maria, Av. Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil
| | - Marli Matiko Anraku de Campos
- Laboratory of Mycobacteriology, Universidade Federal de Santa Maria, Av. Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil
| | - Bernardo Almeida Iglesias
- Bioinorganic and Porphyrinic Materials Laboratory, Universidade Federal de Santa Maria, Av. Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil..
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Santos LP, Soares da Silva D, Ferreira Bertacchi JP, Moreira KS, Lima Burgo TA, Batista BC, Santos JD, Alvarenga de Paula P, Galembeck F. Multifunctional coatings of exfoliated and reassembled graphite on cellulosic substrates. Faraday Discuss 2020; 227:105-124. [PMID: 33300897 DOI: 10.1039/c9fd00109c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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
Exfoliated and reassembled graphite (ERG) forms macroscopic, high aspect ratio (1 : >106) and highly conductive coating layers that are strongly adherent to paper, wood, cloth, ceramic and other substrates. The coating precursor is an aqueous dispersion of graphite that exfoliates spontaneously in alkaline cellulose solutions, forming stable dispersions. These can be applied to the substrates by using different painting, coating and lithography techniques. The coating morphology changes from highly smooth to porous and rough, depending on the finishing procedure used. Coated paper sheets are flexible and they perform as leads in electrical circuitry and as electrodes in electrodeposition, supercapacitors, hygroelectricity cells and other electrochemical devices suitable for flexible and wearable electronics. These unique properties of ERG are explained as a consequence of the amphiphilic character of cellulose, which allows it to play the roles of exfoliant, dispersant, stabilizer, adhesive and plasticizer, while graphite powder is transformed into a cohesive laminated nanocomposite.
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Rossi GG, Guterres KB, da Silveira CH, Moreira KS, Burgo TAL, Iglesias BA, de Campos MMA. Peripheral tetra-cationic Pt(II) porphyrins photo-inactivating rapidly growing mycobacteria: First application in mycobacteriology. Microb Pathog 2020; 148:104455. [PMID: 32810554 DOI: 10.1016/j.micpath.2020.104455] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 06/28/2020] [Accepted: 08/13/2020] [Indexed: 02/08/2023]
Abstract
In this manuscript, we report, for the first time, the photoinactivation evaluation of tetra-cationic porphyrins with peripheral Pt (II)-bpy complexes in the photodynamic inactivation (PDI) of rapidly growing mycobacterial strains (RGM). Two different isomeric Pt (II)-porphyrins were synthetized and applied. PDI experiments in the strains of Mycobacteroides abscessus subsp. Abscessus (ATCC 19977), Mycolicibacterium fortuitum (ATCC 6841), Mycobacteroides abscessus subsp. Massiliense (ATCC 48898), and Mycolicibacterium smegmatis (ATCC 700084) conducted with adequate concentration (without aggregation) of photosensitizers (PS) under white-light illumination for 90 min showed that the most effective PS significantly reduced the concentration of viable mycobacteria. The present results show that positively charged porphyrins at the meta position (3-PtTPyP) are more efficient PS against M. abscessus, M. fortuitum, M. massiliense, and M. smegmatis. The effectiveness of the molecule as PS for PDI studies is also clear with mycobacteria, which is strongly related with the porphyrin peripheral charge and coordination platinum (II) compounds and consequently their solubility in physiological media. Tetra-cationic PS may be promising anti-mycobacterial PDI agents with potential applications in medical clinical cases and bioremediation.
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Affiliation(s)
| | | | - Carolina Hahn da Silveira
- Laboratory of Bioinorganic and Porphyrinic Materials, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil
| | - Kelly Schneider Moreira
- Coulomb Electrostatic and Mechanochemical Laboratory, Universidade Federal de Santa Maria, Av Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil
| | - Thiago Augusto Lima Burgo
- Coulomb Electrostatic and Mechanochemical Laboratory, Universidade Federal de Santa Maria, Av Roraima 1000, Campus Camobi, Santa Maria, RS, Brazil
| | - Bernardo Almeida Iglesias
- Laboratory of Bioinorganic and Porphyrinic Materials, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
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Schestatsky R, Zucuni CP, Dapieve KS, Burgo TAL, Spazzin AO, Bacchi A, Valandro LF, Pereira GKR. Microstructure, topography, surface roughness, fractal dimension, internal and marginal adaptation of pressed and milled lithium-disilicate monolithic restorations. J Prosthodont Res 2020; 64:12-19. [DOI: 10.1016/j.jpor.2019.05.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 05/16/2019] [Accepted: 05/20/2019] [Indexed: 11/28/2022]
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