Food Engineering Progress (산업식품공학)

Korean Society for Industrial Food Engineering (한국산업식품공학회)
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Pasting Properties of Corn, Potato, Sweet Potato Starches and Wheat Flours with Partial Rice Starch Substitution

쌀 전분 첨가 옥수수, 감자, 고구마 전분 및 밀가루의 RVA 호화특성

  • Lee, Hyang-Mi (Department of Food Science and Biotechnology, Gachon University) ;
  • Lee, Young-Tack (Department of Food Science and Biotechnology, Gachon University)
  • 이향미 (가천대학교 식품생물공학과) ;
  • 이영택 (가천대학교 식품생물공학과)
  • Published : 2013.08.31
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Abstract

Rapid visco-analyzer (RVA) was used to evaluate the pasting properties of selected starches; i.e., corn, potato, and sweet potato starches and wheat flours substituted with rice starches isolated from normal and waxy rice samples. The gelatinization temperature and pasting viscosities of rice starch were lower than those of the corn, potato, and sweet potato starches. The peak and trough viscosities of normal corn starch increased as substitution levels of normal and waxy rice starches increased, while setback values tended to decrease. Contrary to normal corn starch, the peak viscosity of waxy corn starch decreased as substitution levels of rice starch increased, while final and setback viscosities increased. The peak viscosity of potato starch, showing the highest value among the starches, slightly decreased with increasing levels of rice starch. However, compared to the other starches, the pasting viscosity of potato starch substituted with rice starch was the highest and its setback value was the lowest. The pasting viscosity of sweet potato starch decreased as substitution levels of rice starch increased. Incorporating normal rice starch increased the pasting viscosities of wheat flour, while waxy rice starch resulted in lowered flour pasting viscosities.

가공식품의 원료로 널리 사용되고 있는 옥수수, 감자, 고구마 전분에 멥쌀 및 찹쌀로부터 분리한 전분을 일부(10-30%) 대체하여 신속점도측정기(RVA)로 호화특성을 조사하였다. 쌀 전분은 호화개시온도가 옥수수, 감자, 고구마전분에 비해 낮았고 페이스트 점도가 타 전분에 비해 낮은 경향이었다. 멥쌀 전분의 호화개시온도는 찹쌀 전분에 비해 높았으며 최고점도, breakdown이 보다 높게 나타났다. 옥수수 전분에 멥쌀 및 찹쌀 전분을 10-30% 대체하여 RVA 호화양상을 측정한 결과 쌀 전분의 첨가는 RVA 최고점도, trough 점도를 증가시켰으나 최종점도에는 큰 증가세를 보이지 않아 setback은 다소 감소하는 경향이었다. 찰옥수수전분에 쌀 전분의 첨가는 옥수수 전분과는 달리 RVA 최고점도를 감소시켰으며 최종점도는 증가세를 나타내 setback이 증가하는 것으로 나타났다. 감자 전분에 쌀 전분의 첨가는 최고점도, trough 점도, 최종점도를 다소 감소시켰으나 여전히 높은 점도를 유지하는 것으로 나타났으며 setback 역시 여전히 낮게 유지됨을 보여주었다. 고구마 전분에 쌀 전분의 첨가는 전분 paste의 최고점도, trough, 최종점도가 감소하는 결과를 초래하였다. 밀가루에 쌀 전분을 대체시에 멥쌀 전분은 밀가루의 페이스트 점도를 증가시키는 반면에 찹쌀 전분은 전반적으로 점도를 감소시키는 것으로 나타났다.

Keywords

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