RETRACTED: Preparation and characterization of hydrophilic debranched starch modified by pullulanase on swollen granule starch(Retracted article. See vol.94,pg.115,2017)

The purpose of this paper is to investigate the feasibility of reducing viscosity of high-concentration starch slurry by adding pullulanase at lower temperatures. The hydrophilic properties of pullulanase debranched starch (DBS) were simultaneously evaluated. The results of GPC and reducing sugar content showed that short linear glucan chains were generated in the debranched starch swollen at 60 degrees C, and the percentage of glucan chains increased with the swelling temperatures (70 degrees C, 80 degrees C). The crystalline structure of swollen starches after pullulanase hydrolysis was changed from double-helical A-type crystalline to a mixture of B-type and single-helical V-type crystalline. This modified starch was partially soluble in cold water, and possessed good water holding capacity. The results of rheological properties showed swollen starches after pullulanase modification was able to form gel structure. (C) 2014 Elsevier Ltd. All rights reserved.