Physicochemical characterization and rheology of starch Arracacha (Arracacia Xanthorrhiza) yellow variety from the San Ignacio Province-Department of Cajamarca

Abstract

In the present article was characterized the physicochemical and rheological properties of the starch of the Arracacha (Arracacia xanthorrhiza) yellow variety coming from the province of San Ignacio-Department of Cajamarca. The extraction of starch physicochemical and rheological properties was conducted and its performance is determined. The results indicate that the extracted starch presented a performance of 11.1%, with a moisture content of 4.71%, 0.27% ash, amylose 15.16% and amylopectin 84.84%. The starch granules showed mostly polyhedral shapes, with sizes from 7 to 25 μm. In addition, one presented high index of water absorption, low solubility and a high to be able of swelling of 16.03, 15.36 % and 16.23 % respectively. The temperature of gelatinization of the starch is 65.3 ° c, was observed a syneresis to the 24 h 6.35% and 48 h 6.9%. The suspensions to 5 % of starch of the arracacha (Arracacia xanthorrhiza) yellow variety pre gelatinized exhibited a behavior of Non-Newtonian fluid of plastic general type with shear force T (0) 5.08 Pa., flow behavior index(n) of 0.61 and consistency index (m) of 3.91 Pa.s.