Polyoxometalate/laccase-mediated oxidative polymerization of catechol for texti...

• Autor(es): Kim, Suyeon ; Silva, Carla Manuela ; Evtuguin, D. V. ; Gamelas, José A. F. ; Paulo, Artur Cavaco
• Data: 2011
• Identificador Persistente: http://hdl.handle.net/1822/17302
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Polyoxometalate; Laccase; Catechol; Mediator; Polymerization
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

The synergistic effect between polyoxometalates (POMs), namely K5[SiW11VVO40]·11H2O and H5[PMo10 VV2O40]·13H2O and laccase from ascomycete Myceliophthora thermophila has been employed for the first time in oxidative polymerization of catechol. Such a laccase-mediator system allowed the formation of a relatively high molecular weight polycatechol as confirmed by size exclusion chromatography and electrospray ionization mass spectrometry (ESI-MS) (3990 Da when using K5[SiW11VVO40]·11H2O and 3600 Da with H5[PMo10VV 2O40]·13H2O). The synthesized polymers were applied as dyes for the dyeing of flax fabrics. The color intensity of flax fabrics colored with polymer solutions was evaluated by diffuse reflectance spectrophotometry via k/s measurements (+10% of fixation ratio). A new synthetic process allowed a dyeing polymer, provided upon flax coloration, better color fixation and color resistance when compared to that obtained by conventional synthesis with laccase solely or with addition of organic mediator (1-hydroxybenzotriazole).