Culinary science and hospitality research (한국조리학회지)

Culinary Society of Korean Academy (한국조리학회)
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Studies on the Fermentation Characteristics of Yogurt Added with Pregelatinized Rice Flour

호화쌀가루를 첨가한 요구르트의 발효특성에 관한 연구

  • Kim, Soo-Hee (Dept. of Culinary Arts, Kyungmin College) ;
  • Kim, An-Na (Dept. of Culinary Science and Food Service Management, Kyunghee University) ;
  • An, Byung-Kyu (Saeamfoodment Co., Ltd.) ;
  • Choi, Soo-Keun (Dept. of Culinary Science and Food Service Management, Kyunghee University)
  • 김수희 (경민대학교 호텔외식조리과) ;
  • 김안나 (경희대학교 일반대학원 조리외식경영학과) ;
  • 안병규 ((주)새암푸드먼트) ;
  • 최수근 (경희대학교 일반대학원 조리외식경영학과)
  • Received : 2014.05.27
  • Accepted : 2014.08.10
  • Published : 2014.08.31
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Abstract

The purpose of this study is developing a formulation with an optimum sensory point by using yogurt added with rice flour and pregelatinized rice flour(alpha rice flour) optimized by response surface method(RSM). The pH, acidity, sugar content, viscosity and number of lactic acid bacteria during fermentation of two types of yogurt(added with rice flour and pregelatinized rice flour) optimized by RSM were analyzed As the fermentation time of both types of yogurt increased, pH showed decreasing trend. The titratable acidity showed increasing trend as fermentation time increased. Sugar content decreased as fermentation time increased. The reasons are believed to be the sugar decrease during glycolysis and lactic acid fermentation. Viscosity was the highest at 6 hours of fermentation. After 10 hours of fermentation, the viscosity was higher than it was before the fermentation. The number of lactic acid bacteria of yogurt added with rice flour and pregelatinized rice flour was 7.43~9.00 log CFU/mL, which is more than optimum value. Therefore, it is possible to confirm that adding rice flour during yogurt manufacturing increases the number of lactic acid bacteria.

본 연구에서는 쌀가루와 호화쌀가루의 첨가량과 처리를 달리한 요구르트를 제조하여 반응표면분석법(RSM)을 이용하여 쌀가루 첨가량의 관능적 최적점을 갖는 조성을 확인하고 이 때의 유산발효 특성을 연구하고자 하였다. RSM을 통해 발효액 조성이 최적화 된 2가지(쌀가루, 호화쌀가루)의 요구르트 발효 중 pH, 산도, 당도, 점도, 유산균 수 검사를 통하여 유산발효 특성을 알아보았다. 쌀가루와 호화쌀가루 첨가 요구르트 모두에서 발효시간이 증가함에 따라 pH가 감소하는 경향을 보였으며, 적정산도는 발효시간이 증가함에 따라 점점 증가하는 경향을 보였다. 당도는 발효시간이 증가함에 따라 감소하는 경향을 보였는데 발효되는 동안 당이 분해 감소되고 젖산발효에 의한 것으로 여겨진다. 점도는 발효 6시간에서 가장 높았으며 발효 완료 시점인 10시간에서는 발효 시작 전보다 높은 점도를 보였다. 쌀가루와 호화쌀가루 첨가 요구르트의 유산균수는 7.43~9.00 log CFU/mL으로 호상요구르트의 식품 규격 적정치 범위 이상으로 측정되어 미분첨가가 요구르트 제조 시의 유산균수에 부합하는 것을 확인할 수 있었다. 또한 쌀가루 보다는 호화쌀가루를 첨가하였을 때 쌀의 첨가량도 늘릴 수 있으며, 점도에서도 좋은 결과를 보여 호화쌀가루를 이용한 요구르트는 쌀을 활용한 더 효과적인 기능성 유산발효제품이 될 수 있을 것으로 보였다.

Keywords

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