Caracterización de la lacasa de "Streptomyces cyaneus" CECT 3335 y aproximación al estudio de su potencial oxidativo y función biológica
- MOYA LOBO, RAQUEL
- María Enriqueta Arias Fernández Director/a
- Manuel Pascual Hernández Cutuli Codirector
Universitat de defensa: Universidad de Alcalá
Fecha de defensa: 30 de de setembre de 2011
- José Antonio Salas Fernández President/a
- Juana Rodríguez Bullido Secretària
- Ramón Santamaría Sánchez Vocal
- María Isabel Pérez Leblic Vocal
- Francisco Ignacio Javier Pastor Blasco Vocal
Tipus: Tesi
Resum
The ability of a laccase (EC 1.10.3.2) produced by Streptomyces cyaneus CECT 3335 to decolourise and detoxify azo dyes was assessed. Results showed that a colour loss of 90% was achieved only in the presence of acetosyringone (0.1 mM) acting as a redox mediator for the laccase. Toxicological analysis of the decolourised dyes revealed that there was no direct correlation between decolouration and detoxification; in fact, in the case of the dyes Methyl Orange and Orange II, a significant increase in toxicity was produced after the treatment. In contrast, a significant decrease in toxicity was observed after the decolouration of New Coccine and Chromotrope 2R. Finally, HPLC analysis of the dyes after treatment revealed the complete disappearance of both dyes and mediator and a concomitant appearance of new chromatographic peaks which could be responsible of the residual toxicity detected in some cases.