Abstract:
Azanone (1HNO, nitroxyl) is a highly reactive molecule with interesting chemical and biological properties. Like nitric oxide (NO), its main biologically related targets are oxygen, thiols, and metalloproteins, particularly heme proteins. As HNO dimerizes with a rate constant between 106 and 107 M-1 s-1, reactive studies are performed using donors, which are compounds that spontaneously release HNO in solution. In the present work, we studied the reaction mechanism and kinetics of two azanone donors Angelís Salt and toluene sulfohydroxamic acid (TSHA) with eight different Mn porphyrins as trapping agents. These porphyrins differ in their total peripheral charge (positively or negatively charged) and in their MnIII/MnII reduction potential, showing for each case positive (oxidizing) and negative (reducing) values. Our results show that the reduction potential determines the azanone donor reaction mechanism. While oxidizing porphyrins accelerate decomposition of the donor, reducing porphyrins react with free HNO. Our results also shed light into the donor decomposition mechanism using ab initio methods and provide a thorough analysis of which MnP are the best candidates for azanone trapping and quantification experiments. © 2014 American Chemical Society.
Registro:
Documento: |
Artículo
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Título: | Redox potential determines the reaction mechanism of HNO donors with Mn and Fe porphyrins: Defining the better traps |
Autor: | Álvarez, L.; Suarez, S.A.; Bikiel, D.E.; Reboucas, J.S.; Batinić-Haberle, I.; Martí, M.A.; Doctorovich, F. |
Filiación: | Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, INQUIMAE-CONICET, Pab. II (1428), Buenos Aires, Argentina Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pab. II (1428), Buenos Aires, Argentina Departamento de Quimica, CCEN, Universidade Federal da Paraiba, Joao Pessoa, Paraiba, Brazil Department of Radiation Oncology, Duke University Medical School, Durham, NC 27710, United States
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Palabras clave: | iron; manganese; nitrogen oxide; nitroxyl; porphyrin; chemistry; kinetics; oxidation reduction reaction; Iron; Kinetics; Manganese; Nitrogen Oxides; Oxidation-Reduction; Porphyrins |
Año: | 2014
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Volumen: | 53
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Número: | 14
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Página de inicio: | 7351
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Página de fin: | 7360
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DOI: |
http://dx.doi.org/10.1021/ic5007082 |
Título revista: | Inorganic Chemistry
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Título revista abreviado: | Inorg. Chem.
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ISSN: | 00201669
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CODEN: | INOCA
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CAS: | iron, 14093-02-8, 53858-86-9, 7439-89-6; manganese, 16397-91-4, 7439-96-5; nitrogen oxide, 11104-93-1; porphyrin, 24869-67-8; Iron; Manganese; Nitrogen Oxides; nitroxyl; Porphyrins
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00201669_v53_n14_p7351_Alvarez |
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Citas:
---------- APA ----------
Álvarez, L., Suarez, S.A., Bikiel, D.E., Reboucas, J.S., Batinić-Haberle, I., Martí, M.A. & Doctorovich, F.
(2014)
. Redox potential determines the reaction mechanism of HNO donors with Mn and Fe porphyrins: Defining the better traps. Inorganic Chemistry, 53(14), 7351-7360.
http://dx.doi.org/10.1021/ic5007082---------- CHICAGO ----------
Álvarez, L., Suarez, S.A., Bikiel, D.E., Reboucas, J.S., Batinić-Haberle, I., Martí, M.A., et al.
"Redox potential determines the reaction mechanism of HNO donors with Mn and Fe porphyrins: Defining the better traps"
. Inorganic Chemistry 53, no. 14
(2014) : 7351-7360.
http://dx.doi.org/10.1021/ic5007082---------- MLA ----------
Álvarez, L., Suarez, S.A., Bikiel, D.E., Reboucas, J.S., Batinić-Haberle, I., Martí, M.A., et al.
"Redox potential determines the reaction mechanism of HNO donors with Mn and Fe porphyrins: Defining the better traps"
. Inorganic Chemistry, vol. 53, no. 14, 2014, pp. 7351-7360.
http://dx.doi.org/10.1021/ic5007082---------- VANCOUVER ----------
Álvarez, L., Suarez, S.A., Bikiel, D.E., Reboucas, J.S., Batinić-Haberle, I., Martí, M.A., et al. Redox potential determines the reaction mechanism of HNO donors with Mn and Fe porphyrins: Defining the better traps. Inorg. Chem. 2014;53(14):7351-7360.
http://dx.doi.org/10.1021/ic5007082