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Physicochemical Properties of Gamma-Irradiated Corn StarchPhysicochemical Properties of Gamma-Irradiated Corn Starch

Other Titles
Physicochemical Properties of Gamma-Irradiated Corn Starch
Authors
강일준Yong-Jin LeeSun Young Kim임승택Sag-Myung HanHye-Mi Kim
Issue Date
2006
Publisher
한국식품영양과학회
Keywords
gamma irradiation; corn starch; modified starch
Citation
Preventive Nutrition and Food Science, v.11, no.2, pp.146 - 154
Indexed
KCI
Journal Title
Preventive Nutrition and Food Science
Volume
11
Number
2
Start Page
146
End Page
154
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/125968
ISSN
2287-1098
Abstract
Structural modification of corn starch by gamma irradiation was evaluated for under dry conditions at varied intensities from 0 to 40 kGy. Under scanning electron microscopy, the granule shape of corn starch was not significantly affected by the irradiation up to 40 kGy. In addition, X-ray diffraction and melting patterns of the irradiated starches were similar to those of the native starch, indicating that crystalline regions in the starch granules were not changed by irradiation. However, the pattern of gel permeation column chromatography showed a significant increase in partial hydrolysis of gamma irradiated starch samples. The degree of polymerization and the paste viscosity of irradiated starch samples dose-dependently decreased significantly with irradiation, and increased solubility and clarity were observed in the irradiated starch solution. In addition, the degree of retrogradation decreased as irradiation dose increased. Irradiation of corn starch has advantages over the ordinary acid or the enzyme hydrolysis modification methods. It does not affect the granular shape and crystalline phase of starch during hydrolysis, and the process can be carried out in dry state.
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