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Can I read Photodegradation of Sodium Rifamicyn SV on EtoBox?
Photodegradation of Sodium Rifamicyn SV by Eduardo Sánchez; Isela Gutiérrez; Marta Luiz; Gabriela Martı́nez; Susana Criado; Norman A. Garcı́a is a Materials Science article available to read on EtoBox.
What is Photodegradation of Sodium Rifamicyn SV about?
The intense colouring antibiotic Sodium Rifamicyn SV (Rfc) is decomposed by direct and sensitized photoirradiation, through a complex mechanism. This in ̄uences the microbiological activity of Rfc. It reacts from its electronic excited states upon light absorption and by a singlet molecular oxygen-and superoxide ion-mediated mechanism upon sensitized photoirradiation, employing Rose Bengal as a dye sensitizer. The rate constant for the reaction with singlet molecular oxygen was determined as 1.210 8 and 5.110 8 M À1 s À1 at pH 6 and 12, respectively, by means of comparative methods. Both an increase in the decomposition rate as the solvent polarity decreases and a clear dependence of the decomposition kinetics on the pH of the medium can be observed. The latter factor suggests that the hydroquinonic structure of Rfc is the molecular moiety responsible for the photorreaction. The decrease in the antimicrobial power parallels the progress of the photodegradation. This indicates the lack of antibiotic activity by the reaction products.
Who reads Photodegradation of Sodium Rifamicyn SV?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Eduardo Sánchez; Isela Gutiérrez; Marta Luiz; Gabriela Martı́nez; Susana Criado; Norman A. Garcı́a
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0143-7208)
- Published
- 1998
- Language
- EN
- Field
- Materials Science (Physical Sciences)