A rheological description of mixtures of a galactoxyloglucan with high amylose and waxy corn starches

A galactoxyloglucan hydrocolloid (HXG) was extracted with water from endosperms of seeds of Hymenaea courbaril and purified (18.5% yield). It contained galactose, xylose, and glucose in a similar to 1:3:4 molar ratio. HXG was mixed with a high amylose (66%) (CSM) and waxy corn starch (CSP). Each gel mixture, under static rheological conditions, showed an increase in the paste viscosity, when compared with those of starches or HXG alone. Dynamic rheological analysis showed an interaction occurred in the HXG-CSM mixture resulting in an increased thermal stability of its gel, when compared with that of CSM alone. (C) 2003 Published by Elsevier Science Ltd.