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Physicochemical, pasting, and emulsification properties of octenyl succinic anhydride modified waxy rice starch

옥테닐 석시닐 무수물 변성찹쌀녹말의 이화학, 호화 및 유화특성

  • No, Junhee (Division of Food and Nutrition, Human Ecology Research Institute, Chonnam National University) ;
  • Shin, Malshick (Division of Food and Nutrition, Human Ecology Research Institute, Chonnam National University)
  • 노준희 (전남대학교 식품영양과학부 및 생활과학연구소) ;
  • 신말식 (전남대학교 식품영양과학부 및 생활과학연구소)
  • Received : 2017.04.17
  • Accepted : 2017.05.25
  • Published : 2017.10.31

Abstract

Waxy rice starch purified from Hwaseonchal white rice was modified by octenyl succinic anhydride (OSA) for use as an emulsifier. OSA-modified starches (1, 2, and 3% OSA, pH 8.5, 6 h) were investigated to understand their physicochemical and pasting properties, and emulsion stability. The degree of substitution (DS) of 1, 2, and 3% OSA starches was 0.0062, 0.0182, and 0.0214, respectively. FT-IR spectroscopy showed that OSA starches showed weak peaks at 1724 and $1572cm^{-1}$ and the peak at $3300cm^{-1}$ was reduced by an increase in the DS. Native and OSA starches showed A type crystallinity and a similar granular size. The OSA starch increased the peak viscosity, but decreased the onset and peak temperatures, and enthalpy with an increase in OSA concentration. The creaming index of emulsion of OSA starches decreased with an increase OSA concentration. It was suggested that the emulsion stabilizing capacity of OSA waxy rice starches increased with an increase in the OSA concentrations.

화선찰 백미로부터 분리한 찹쌀 녹말을 옥테닐 석시닐 무수물(OSA)로 변성처리 하여 유화제로 사용하기 위해 OSA 1, 2, 3%를 가하여(pH 8.5, 6시간) 변성녹말을 제조하고 이화학 및 호화특성과 유화 안정성을 조사하였다. OSA 1, 2와 3%로 제조한 변성 찹쌀녹말의 치환도는 각각 0.0062, 0.0182 및 0.0214이었다. FT-IR로 분석한 모든 OSA 변성 녹말은 모두 1724와 $1572cm^{-1}$에서 약한 피크를 보였으며 치환도가 클수록 $3300cm^{-1}$의 피크는 감소하였다. X-선 회절도에 의한 결정형은 생 녹말과 같은 A 형이었고 입자 크기는 유사하였다. OSA 변성녹말은 피크 점성이 농도에 따라 증가하였고 초기호화온도와 피크온도 및 엔탈피는 감소하였다. OSA 변성녹말의 크리밍 지수는 OSA농도가 증가함에 따라 감소하였다. 위 결과로부터 OSA변성 찹쌀녹말의 유화 안정성은 OSA 농도에 따라 증가함을 확인하였다.

Keywords

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