Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Effects of Feed Moisture and Barrel Temperature on Physical and Pasting Properties of Cassava Starch Extrudate

수분주입량과 배럴온도에 따른 카사바 전분 압출성형물의 물리적 특성

  • Serge, Edou Ondo (Department of Food Science and Technology, Kongju National University) ;
  • Gu, Bon-Jae (Department of Food Science and Technology, Kongju National University) ;
  • Kim, Yeon-Soo (Department of Food Science and Technology, Kongju National University) ;
  • Ryu, Gi-Hyung (Department of Food Science and Technology, Kongju National University)
  • Received : 2010.12.02
  • Accepted : 2011.05.13
  • Published : 2011.06.30
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Abstract

Considering the importance of cassava as food crops in humid tropics, the effect of feed moisture (20, 25%) and barrel temperature (110, $130^{\circ}C$) on physical properties (piece density, expansion, mechanical properties, color, water solubility index, water absorption index) and pasting properties of extruded cassava starch was investigated. The feed moisture used during extrusion processing had a significant effect on extrudates SME input, specific length and piece density at (p<0.05) while effect on cross-sectional expansion index, apparent elastic modulus and breaking strength in bending shown significantly at p<0.1. Furthermore, the interaction effect of feed moisture and barrel temperature gave a significantly affected the SME input and piece density (p<0.1), specific length (p<0.05) and on redness (p<0.01). The increase in water injection rate led to increase in piece density, apparent elastic modulus, breaking strength in bending, cold peak viscosity, breakdown and final viscosity and decrease in cross-sectional expansion index and specific length. It was found that the extrusion cooking process did not affect the value of color L, color b, water solubility index and water absorption index. Thus, the results of this study can be useful to some extent in developing extruded cassava starch as human and animal feeds.

다습한 열대지방에서 카사바는 중요한 식물자원이다. 수분함량(20, 25%)와 배럴온도(110, $130^{\circ}C$) 에 따른 압출성형 카사바전분의 물리적 특성(밀도, 팽화율, 비기계적 에너지, 색, 수분용해지수, 수분흡착지수)와 호화특성을 조사하였다. 카사바전분 압출성형공정에서 수분 투입량은 압출성형물의 비기계적 에너지 투입량, 비길이, 밀도에 유의적으로 영향을 미쳤으며(p<0.05) 직경팽화지수, 겉보기탄성계수와 절단강도에서 유의성을 보여주었다(p<0.1). 또한 수분투입량과 배럴온도의 상호관계에서 비기계적 에너지 투입량과 밀도(p<0.1), 비길이(p<0.05), 적색도(p<0.01)는 유의성을 나타내었다. 수분투입량이 증가함에 따라 밀도, 겉보기탄성계수, 절단강도, 저온최고점도, 구조파괴점도, 최종점도는 증가하였으며, 직경팽화지수와 비길이는 감소하였다. 카사바전분 압출성형공정에서 수분투입량과 배럴온도는 명도와 황색도, 수분용해지수, 수분흡착지수에 영향을 미치지 않았다. 이 연구의 결과는 카사바 전분을 압출성형하여 사료와 식품을 개발하는데 유용하게 이용될 수 있을 것이다.

Keywords

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