INTEMA   05428
INSTITUTO DE INVESTIGACIONES EN CIENCIA Y TECNOLOGIA DE MATERIALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Potato starches: rheology and enzymatic degradation
Autor/es:
VAZQUEZ ANALÍA; MORÁN JUAN; CYRAS VIVIANA; FORESTI, LAURA
Lugar:
Gramados, Brasil
Reunión:
Congreso; ISNaPol - XII International Macromolecular Colloquium - 7th International Symposium on Natural Polymers and Composites; 2010
Institución organizadora:
European Polysaccharide Network Of Excellence and Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic
Resumen:
Native and derivatized potato starch rheology was studied. The rheological behavior was related to the molecular weight, thermal properties, crystallinity, amylose content, and swelling. Rheological experimental results were fitted by different models Acetylated starch was found to be less pseudoplastic than native starch. The enzymatic degradation pattern of derivatized starch films by use of a commercial alfa-amylase from Bacillus licheniformis. Comparison of different derivatization procedures revealed that the derivatized starch film was enzymatically hydrolyzed at a much higher rate than native starch film. Differences in degradation rates of chemically modified films were explained in terms of the presence of bulky acetyl groups hat hinder the access of starch-degrading enzymes