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Effects of steeping temperatures and periods of waxy rice on expansion properties of Gangjung (a traditional Korean oil-puffed rice snack)

Title
Effects of steeping temperatures and periods of waxy rice on expansion properties of Gangjung (a traditional Korean oil-puffed rice snack)
Authors
Haeng R.K.Kyung M.K.Lee H.-S.Kwang O.K.
Ewha Authors
김광옥이혜성
SCOPUS Author ID
김광옥scopus; 이혜성scopus
Issue Date
2008
Journal Title
Cereal Chemistry
ISSN
0009-0352JCR Link
Citation
vol. 85, no. 3, pp. 314 - 321
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
This study was conducted to investigate the effect of steeping conditions of waxy rice, temperatures (15, 25, and 35°C) and time periods (1, 11, and 21 days) on the expansion ratio of gangjung (a traditional Korean oil-puffed rice snack). Physicochemical properties of waxy rice flour steeped under various conditions and expansion properties of gangjung made of the steeped waxy rice flour were investigated, and multiple regression analyses were applied between those properties to identify major physicochemical factors that optimally predict the expansion ratio of gangjung. As steeping temperature and time periods of waxy rice changed from the lowest to the highest, the expansion ratio of gangjung markedly increased (from 1,022 to 2,533%). Yet, the expansion ratio of the waxy rice sample steeped for 11-21 days at 35°C was not significantly different from the sample steeped for 21 days at 25°C, indicating that the lengthy steeping process for gangjung making can be shortened by increasing the steeping temperature. Physicochemical properties include moisture (γ = 0.85), protein (γ = -0.91), ash (γ = -0.84), potassium (γ = -0.89), magnesium (γ = -0.88), phosphorous (γ = -0.91), peak viscosity (γ = 0.77), and breakdown (γ = 0.94) of steeped waxy rice flour. These properties were highly correlated with expansion ratio (P < 0.01). Multiple regression analysis showed that the expansion ratio of gangjung was predicted successfully by the phosphorous content and breakdown value of steeped waxy rice flour. © 2008 AACC International, Inc.
DOI
10.1094/CCHEM-85-3-0314
Appears in Collections:
엘텍공과대학 > 식품공학전공 > Journal papers
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