Enzymatic transformation of crystalline structure of copolymer poly (ethylene-co-vinyl alcohol) (EVOH)
Vitae (Medellín)
;
14(1): 25-30, ene.-jun. 2007. graf
Artigo
em Inglês
| LILACS
| ID: lil-502201
ABSTRACT
Changes in the crystalline structure of the copolymer poly(ethylene-co-vinyl alcohol) (EVOH) that occurs during the enzymatic fermentation system with the fungus Phanerochaete chrysosoporium were studied. This fungus has a powerful group of oxidative enzymes that had been used for several processes of environmental pollutants degradation. In order to use the enzymatic system of the fungus to improve degradation, films of the copolymer are inoculated and maintained in a solid state fermentation (SSF) system using as substrate a mixture of agroindustrial corn wastes with an initial humidity of 90 por ciento, during forty days. Analyses of the films were made at different times of fermentation. The effect on the chemical structure of the polymer was studied by using FTIR-spectroscopy with attenuated total reflection (ATR) and changes in the crystalline structure were determined by differential scan calorimetry DSC and X-ray diffraction technique. The lignin peroxidase (LiP) activity was followed by UV-spectrophotometry. We concluded that after 20 days of fermentation the copolymer has lost 50 percent of the initial crystalline structure.
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Índice:
LILACS (Américas)
Assunto principal:
Peroxidase
/
Phanerochaete
Idioma:
Inglês
Revista:
Vitae (Medellín)
Assunto da revista:
Farmácia
/
Química
Ano de publicação:
2007
Tipo de documento:
Artigo
País de afiliação:
Colômbia
Instituição/País de afiliação:
Universidad de Antioquia/CO
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