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Effects of Carbohydrate Materials on Retarding Retrogradation of a Korean Rice Cake (Karedduk)

가래떡 노화 억제에 대한 당류 물질의 효과

  • 김상숙 (한국식품연구원 특화연구본부 쌀연구단) ;
  • 정혜영 (경원대학교 식품영양학과)
  • Published : 2007.10.30

Abstract

Retarding retrogradation of a Korean rice cake (Karedduk) added with carbohydrate materials after $0{\sim}30hrs$ of storage at $5^{\circ}C$ were investigated by Avrami equation using textural characteristics. Carbohydrate materials such as powdered sugar, trehalose, fructooligosaccharide (95%), isomalto, healtholigo, and galactooligo-saccharide (50%) were added in 0, 1, 5 or 10% levels on dry rice flour. In the amylogram, the breakdown (P-H) and consistency (C-H) for Karedduk added with carbohydrate materials were lower than those of the control. Decrease in the Avrami exponent (n) and increase in the time constant (1/k) of Karedduuk added with carbohydrate materials during storage determined by Avrami equation were important comparison factors to the control in terms of retrogradation rate analysis. The Aurami exponent (n) for control, fructooligosaccharide (95%) 10% and healtholigo 1% addition were 2.415, 1.977 and 3.297, respectively. The time constant (1/k) for fructooligosaccharide (95%) 5% and healtholigo 1% addition were lower than thecontrol. Lastly, Karedduk added with carbohydrate materials, except for fructooligosaccharide (95%) 5% and healtholigo 1% addition, was effective in retarding retrogradation.

가래떡의 노화 특성을 규명하기 위하여, 미분당, 트레할로스, 프락토올리고당(95%), 이소말트, 헬스리고 및 갈락토을리고당(50%) 등 6종류 당류 물질을 쌀가루 기준으로 0, 1, 5 또는 10%의 농도로 첨가하여 쌀가루의 pasting 특성을 측정하였고, 가래떡을 제조하여 $5^{\circ}C$ 냉장 보관하면서 0, 2, 4, 6, 22, 24, 28및 30시간 경과 후 조직감의 특성 중 경도의 변화를 Avrami 방정식에 따라 노화 특성 분석을 하였다. 쌀가루의 pasting특성에서 전분 노화와 관계가 있는 break-down, consistency는 무첨가군과 비교한 결과 실험군의 값이 낮았고 대부분 첨가물에서 노화억제 효과가 있었다. Avrami방정식에 따른 노화 특성 분석 결과는 실험에 사용한 첨가물 중 프락토올리고당(95%) 10%와 트레할로스 10% 첨가 수준에서 Avrami(n)지수 값이 1.977과 2.004로 낮았고, 헬스리고 1% 첨가 수준에서 3.297로 가장 높았다. 노화의 속도를 나타내는 시간상수(1/k)는 트레할로스 10% 첨가된 떡은 238.10으로 노화의 진행 속도가 가장 낮았고, 프락토을리고당(95%) 5%와 헬스리고 1%군은 무첨가군에 비해 그값이 낮아 노화속도가가 빠른 것으로 나타났다. 따라서 무첨가군에 비해 노화 진행 속도가 빠른 것으로 나타난 프락토을리고당(95%) 5%군과 헬스리고 1%군을 제외한 다른 모든 실험군은 노화속도를 늦추는데 효과적이었다.

Keywords

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