Quality Characteristics of Jeungpyun Prepared by Rice Sourdough

The purpose of this work was to improve the quality of Jeungpyun made with rice sourdough, which was prepared using a mixed culture of Saccharomyces cerevisiae (S. cerevisiae) and Leuconostoc mesenteroides (L. mesenteroides) strains, and to also develop a new process for Jeungpyun preparation using the rice sourdough. The Jeungpyun was manufactured through proofing for 3 hr at $30^{\circ}C$ and steaming steps after mixing the ingredients, including pre-fermented rice sourdough, rice powder and water. After proofing, the expansion ratio of the Jeungpyun dough ranged from 109 to 135% and the pH was decreased to pH 3.80$\sim$4.09. The volumes of the Jeungpyun samples prepared with rice sourdough were 18$\sim$45% greater than that of the control. In particular, the Jeungpyun made with rice sourdough containing 10% brown rice (CM-10) had a significantly greater volume (266 mL). Also the rice sourdough Jeungpyun samples had well developed dense porous structures compared to the control. According to sensory evaluations, the sample prepared with rice sourdough containing 10% brown rice was preferred. Finally, the physical quality (texture properties) and microbiological shelf-life of the Jeungpyun was improved by using the rice sourdough.

Rice Sourdough를 첨가한 증편의 품질특성

효모와 유산균이 혼합배양 된 rice sourdough를 제조하여 이를 증편에 첨가함으로써 기존 증편의 이취를 개선하고 발효에 의한 조직감 향상과 발효 생성물에 의한 기호성을 증대시키고자 하였다. 증편은 rice sourdough와 쌀가루를 반죽하고, $35^{\circ}C$에서 3시간 동안 발효를 실시한 후 증자하여 제조하였다. 발효 후 반죽의 팽창도는 rice sourdough를 첨가한 증편인 경우는 109$\sim$135%에 이르렀으며, pH는 3.80$\sim$4.09로 낮아졌다. Rice sourdough를 첨가한 증편의 부피는 첨가하지 않은 증편보다 18$\sim$45% 컸으며 특히, 현미분이 10% 첨가된 rice sourdough를 사용한 증편(CM-10)의 부피가 크게 증가되었다. Rice sourdough를 첨가하여 제조된 증편이 rice sourdough를 사용하지 않은 증편에 비해 내부에 다공성 조직이 조밀하게 발달되었다. 관능평가를 실시한 결과, 현미분이 10% 첨가된 rice sourdough로 제조한 증편을 선호하는 것으로 평가되었다. 또한, 본 연구에서 효모와 유산균을 혼합배양 한 rice sourdough를 첨가함으로써 최종제품인 증편의 물리적(조직특성) 품질과 미생물학적 저장성이 개선되었다.