Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Texture Profiles and Retarding Retrogradation Analysis of a Korean Rice Cake (Karedduk) with Addition of Oligosaccharides

올리고당 첨가 가래떡의 텍스처 변화와 노화 억제 분석

  • 김상숙 (한국식품연구원 유통연구단) ;
  • 정혜영 (가천대학교 식품영양학과)
  • Received : 2012.01.10
  • Accepted : 2012.02.11
  • Published : 2012.04.30
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Abstract

The retrogradation properties of a Korean rice cake ($Karedduk$) added with oligosaccharides after 0~30 hr of storage at $5^{\circ}C$ were examined by texture profile analysis and the Avrami equation using textural characteristics. Oligosaccharides, such as galactooligosaccharide (50%) and maltooligosaccharide, were added to dry rice flour at levels of 10%. In the amylogram, the breakdown (P-H) and consistency (C-H) of the Korean rice cake (Karedduk) added with oligosaccharides were lower than those of the control. Texture profile analysis using a Texture Analyzer revealed that the hardness of the Korean rice cake ($Karedduk$) added with oligosaccharides was lower than the control. The Avrami exponent ($n$) for the control, galactooligosaccharide (50%) 10% and maltooligosaccharide 10% addition was 2.415, 2.771 and 2.683, respectively. The time constant (1/$k$) for galactooligosaccharide (50%) 10% or maltooligosaccharide 10% addition was higher than the control. Overall, adding galactooligosaccharide (50%) 10% or maltooligosaccharide 10% to a Korean rice cake ($Karedduk$) is effective in retarding retrogradation.

가래떡의 노화 특성을 분석하기 위하여 갈락토올리고당(50%)과 말토올리고당을 쌀가루 기준으로 각각 10% 농도로 첨가하여 쌀가루의 pasting 특성을 측정하였고, 가래떡을 제조하여 $5^{\circ}C$ 냉장 보관하면서 0, 2, 6, 24 및 30시간 경과 후 텍스처의 변화를 Texture Analyzer에 의해 측정하여 실험군의 떡을 무첨가군 떡과 비교하였다. 그리고 가래떡의 노화도는 텍스처 특성 중에서 0, 2, 4, 6, 22, 24, 28 및 30시간 경과 후 경도의 변화를 이용하여 Avrami 방정식에 따라 실험군의 떡을 무첨가군 떡과 비교하였다. 갈락토올리고당(50%)과 말토올리고당을 첨가한 실험군의 pasting 특성에서 peak(P) viscosity는 무첨가군에 비해 낮게 나타났고, hot paste viscosity(H)는 높게 나타났다. Breakdown(P-H)과 consistency(C-H)는 모든 실험군에서 무첨가군에 비해 낮게 나타나 올리고당을 10%를 첨가한 실험군에서 노화억제 효과가 있는 것으로 나타났다. 텍스처 특성 중 경도의 경우 실험군은 무첨가군에 비해 감소하는 경향으로 노화를 억제하는 효과를 보여 주었다. Avrami 방정식에 따른 노화 특성 분석 결과는 Avrami($n$)지수 값은 무첨가군보다 약간 높은 범위였으나 노화의 속도를 나타내는 시간상수(1/$k$)는 무첨가군 떡의 경우 43.29이었고 실험군의 경우는 82.64에서 84.75 범위로 무첨가군에 비해 그 값이 높았으며 노화속도가 느린 것으로 나타났다. 따라서 무첨가군에 비교하여 실험군 모두 경도가 낮고 노화 진행속도가 느린 것으로 나타나 갈락토올리고당(50%)과 말토올리고당을 가래떡 제조 시 10% 수준으로 첨가하면 노화억제 효과가 있는 것으로 확인되었다.

Keywords

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