Effect of Rice Protein on the Network Structure of Jeung-Pyun

The aim of this study was to examine the effect of rice protein on the network structure of the Jeung-Pyun. The major component of Jeung-Pyun rice protein was extracted, the change of rice protein during the Jeung-Pyun fermentation was assessed, and the effect on the viscosity and volume of adding protease to Jeung-Pyun was investigated. In addition, the result of adding protein to rice starch on the viscosity and volume of Jeung-Pyun was that the rice protein mediated the volume and expansion ability. The results were as follows. In rice and dough of Jeung-Pyun, the SDS soluble protein content was higher than that of wheat flour and no change was detected in the amount of extracted protein with the fermentation time. However, in the FPLC pattern, low molecular weight peaks were decreased with the fermentation time, which indicates the increase in the ratio of high molecular weight substances. In contrast, the addition of protease substantially decreased, the viscosity and volume of Jeung-Pyun, whereas the viscosity and volume were increased by adding protein to rice starch in order to reconstitute Jeung-Pyun. This suggested that rice protein in Jeung-Pyun had a mediating effect on both the volume and the formation of the texture.

증편 구조에 미치는 쌀 단백질의 영향

증편의 sponge상의 망상구조에 쌀 단백질의 영향을 조사하기 위하여 증편제조시 주원료인 쌀 단백질을 분리하고 증편 발효시 그 변화를 살펴보았으며 protease 첨가가 증편의 점도 및 부피에 미치는 영향을 살펴보았다. 또한 쌀 전분에 단백질을 첨가하여 증편의 점도 및 부피에 미치는 영향을 살펴본 결과 쌀 단백질이 증편의 부피 팽창에 영향을 주는 것으로 생각되었다. 쌀 및 증편 반죽에서는 SDS 가용성 단백질 함량이 밀가루와 비교해 높게 나타났으며 발효시간에 따른 단백질 추출량은 큰 변화가 없었다. 그러나 증편반죽의 시간별 FPLC패턴은 발효시간에 따라 저분자 peak가 감소하여 고분자화함을 알 수 있었다. 단백질 분해효소 protease를 첨가하여 본 결과 증편의 점도 및 부피는 현저히 감소하였고 쌀 전분에 단백질을 첨가하여 증편을 재구성한 결과, 점도, 부피는 증가하는 것으로 나타나 증편내에서 쌀 단백질이 증편의 부피 내지는 조직감 형성에 크게 영향을 미치는 것으로 생각되어진다.