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Quality Characteristics of Black Rice Cookies as Influenced by Content of Black Rice Flour and Baking Time

흑미의 배합비와 굽기시간에 따른 흑미쿠키의 품질특성

  • Kim, Yang-Sun (Div. of Food Science & Engineering, Daegu University) ;
  • Kim, Gyeong-Hwa (Dept. of Food Engineering, Kyungpook National University) ;
  • Lee, Jun-Ho (Div. of Food Science & Engineering, Daegu University)
  • Published : 2006.04.01

Abstract

Response surface methodology was used to investigate the cookie manufacturing process with black rice flour. A three- variable, three-level central composite design was employed where the independent variables were the amount of black rice flour ($0{\sim}20%$), baking time ($10{\sim}14 min$), and sugar type (sucrose, aspartame and oligosaccarides). pHs of dough and cookie tended to increase with the addition of black rice flour. Moisture content of dough slightly increased with tile addition of black rice flour but nearly affected by baking time. Spread factor increased with the addition of black rice flour and it was more evident in the samples prepared with sucrose. L*-value decreased but a*-value increased significantly with the addition of black rice flour. Generally the amount of black rice flour in the sample did not affect the textural characteristics of cookie. As the amount of black rice and baking time increased, sensory flavor became stronger. Sensory sweetness as well as hardness increased but sensory color became darker with the addition of black rice flour. In addition, the response surface models developed in this study for most of physicochemical and sensory characteristics of black rice cookie were adequate.

흑미 첨가량($0{\sim}20%$), 굽기시간($10{\sim}14분$) 및 당의 종류(설탕, 올리고당, 합성 감미료)를 달리 하여 쿠키를 제조하고 공정조건이 흑미쿠키의 이화학적 및 관능적 품질특성에 미치는 영향을 반응표면 분석법에 의해 살펴보았다. 흑미 첨 가랑이 증가함에 따라 pH는 반죽 또는 쿠키와 상관없이 증가하는 경향을 나타내었고 반죽의 경우 그 증가폭이 큰 것으로 나타났으며. 반죽의 pH는 굽기시간에 따라 거의 영향을 받지 않았으나 쿠키의 경우 굽기시간이 증가함에 따라 다소 감소하는 경향을 나타내었다. 반죽의 수분함량은 흑미 첨가량이 증가할수록 다소 증가하는 경향을 나타내었고 굽기 시간에 따른 영향은 거의 없는 것으로 나타났다. 쿠키의 퍼짐성은 흑미 첨가량이 증가할수록 증가하는 경향을 나타내었고 그 증가폭은 설탕이 첨가된 쿠키에서 보다 뚜렷하게 나타났다. 또한 흑미 첨가량이 증가함에 따라 L*값은 감소한 반면 a*값은 현저하게 증가하였다. 일반적으로 흑미 첨가량의 변화는 제조에 사용된 당의 종류에 상관없이 쿠키의 경도나 fracture force에 큰 영향을 미치지 않는 깃으로 나타났다. 쿠키의 향과 단맛은 흑미 첨가량이 증가할수록 강하고 나타났고 색은 흑미 첨가량이 증가할수록 어둡다고 평가되었다. 본 연구에서 제시된 반응표면 모델식은 흑미쿠키 품질특성을 적합하게 예측할 수 있는 것으로 판단된다.

Keywords

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