CONICET | Buscador de Institutos y Recursos Humanos

Abstract: 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 a-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 group that hinder the access of starch-degrading enzymes.