PubAg

Main content area

A new insight into the gelatinization process of native starches

Author:
Ratnayake, W.S., Jackson, D.S.
Source:
Carbohydrate polymers 2007 v.67 no.4 pp. 511-529
ISSN:
0144-8617
Subject:
corn starch, wheat starch, potato starch, cassava starch, gelatinization, waxy corn, tapioca, amylopectin, amylose, starch granules, microstructure, phase transition, heat treatment, swelling (materials), crystal structure, statistical analysis
Abstract:
The gelatinization characteristics of seven different food starches (regular corn, high-amylose corn, waxy corn, wheat, rice, potato, and tapioca) were investigated. Each starch sample type was heated to 35, 40, 45, etc. up to 85 °C at 5 °C intervals, and freeze-dried. The treated samples were analyzed using light microscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and high-performance size exclusion chromatography (HPSEC). When heated, granules underwent structural changes prior to the visible morphological changes that took place during gelatinization. The nature of these structural changes depended on starch type. These results indicate that the starch gelatinization process is more complex than a simple granular order-to-disorder transition.
Agid:
709342