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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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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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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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Bernardes PTT, Rezende BM, Resende CB, De Paula TP, Reis AC, Gonçalves WA, Vieira EG, Pinheiro MVB, Souza DG, Castor MGM, Teixeira MM, Pinho V. Nanocomposite treatment reduces disease and lethality in a murine model of acute graft-versus-host disease and preserves anti-tumor effects. PLoS One 2015; 10:e0123004. [PMID: 25875016 PMCID: PMC4395348 DOI: 10.1371/journal.pone.0123004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 02/26/2015] [Indexed: 12/21/2022] Open
Abstract
Graft versus host disease (GVHD) is an immunological disorder triggered by bone marrow transplantation that affects several organs, including the gastrointestinal tract and liver. Fullerenes and their soluble forms, fullerols, are nanocomposites with a closed symmetrical structure with anti-inflammatory and anti-oxidant properties. The present study evaluated the effects of treatment with the fullerol (C60(OH)18-20) in the development and pathogenesis of GVHD in a murine model. Mice with experimental GVHD that were treated with the fullerol showed reduced clinical signs of disease and mortality compared with untreated mice. Treatment with the fullerol decreased the hepatic damage associated with reduced hepatic levels of reactive oxygen species, pro-inflammatory cytokines and chemokines (IFN-γ TNF-α, CCL2, CCL3 and CCL5) and reduced leukocyte accumulation. The amelioration of GVHD after treatment with the fullerol was also associated with reduced intestinal lesions and consequent bacterial translocation to the blood, liver and peritoneal cavity. Moreover, the fullerol treatment alleviated the GVHD while preserving effects of the graft against a leukemia cell line (GFP+P815). In summary, the fullerol was effective in reducing the GVHD inflammatory response in mice and may suggest novel ways to treat this disease.
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Affiliation(s)
- Priscila T. T. Bernardes
- Laboratório de Resolução da Resposta Inflamatória, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Bárbara M. Rezende
- Laboratório de Resolução da Resposta Inflamatória, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Carolina B. Resende
- Laboratório de Resolução da Resposta Inflamatória, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Talles P. De Paula
- Laboratório de Interação Microorganismo e Hospedeiro, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Alesandra C. Reis
- Laboratório de Resolução da Resposta Inflamatória, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - William A. Gonçalves
- Laboratório de Resolução da Resposta Inflamatória, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Elias G. Vieira
- Laboratório de Ressonância Paramagnética, Departamento de Física Instituto de Ciências Exatas,Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Maurício V. B. Pinheiro
- Laboratório de Ressonância Paramagnética, Departamento de Física Instituto de Ciências Exatas,Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Danielle G. Souza
- Laboratório de Interação Microorganismo e Hospedeiro, Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Marina G. M. Castor
- Laboratório de Resolução da Resposta Inflamatória, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Mauro M. Teixeira
- Laboratório de Imunofarmacologia, Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Vanessa Pinho
- Laboratório de Resolução da Resposta Inflamatória, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
- * E-mail:
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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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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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Pereira BG, Vianna-Soares CD, Righi A, Pinheiro MVB, Flores MZS, Bezerra EM, Freire VN, Lemos V, Caetano EWS, Cavada BS. Identification of lamivudine conformers by Raman scattering measurements and quantum chemical calculations. J Pharm Biomed Anal 2007; 43:1885-9. [PMID: 17303364 DOI: 10.1016/j.jpba.2007.01.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2006] [Revised: 01/06/2007] [Accepted: 01/08/2007] [Indexed: 10/23/2022]
Abstract
Characterization of nucleoside and non-nucleoside human immunodeficiency virus (HIV) reverse transcriptase inhibitors conformers, NRTIs and NNRTIs, respectively, is fundamental for an improved treatment of infected individuals. Three conformers in lamivudine I powder are quickly identified in this work by assignment of some Raman peaks to their vibrational frequencies, as obtained by first principles quantum chemical calculations. The method is proposed as a practical procedure for non-destructive identification, analysis, and process monitoring of NRTIs and NNRTIs conformers.
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Affiliation(s)
- B G Pereira
- Escola de Farmácia, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627, Campus Pampulha, 30123-970 Belo Horizonte, Minas Gerais, Brazil
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