Abstract

유청농도 12% 용액에 Lactobacillus helveticus ATCC 55163과 Propionibacterium acidipropionici 5020을 혼합 배양하여 프로피온산, 초산, 젖산 등이 생성된 유청발효물을 빵 제조 시 물의 10%, 15% 대체하여 제조한 빵의 부피, pH 및 총산도, 수분함량, 수분활성도, 조직감, 유기산, 관능검사 등을 분석하였다. 부피는 대조구가 가장 컸고, pH 및 총산도에서 pH는 대조구가 가장 낮았고 총산도는 대조구가 가장 높았다. 수분은 유청발효물 함량에 따라 차이가 없었고 수분활성도는 저장기간이 길어질수록 유청발효물 10% 첨가한 것에서 가장 높았다. 조직감은 저장기간이 길어질수록 유청발효물 10% 첨가한 것의 경도 (hardness)가 가장 낮아 부드러웠다. 유기산 함량 분석에서 대조구에서는 프로피온산이 검출되지 않았고, 호박산 젖산 초산 등도 시험구보다 낮게 검출되었다. 시험구 중에는 유청발효물을 15% 첨가한 것에서 호박산, 초산, 젖산 등이 높게 검출되었고 특히 프로피온산 검출량이 높았다. 관능검사에서 유청발효물을 10% 첨가한 것이 가장 높은 점수를 얻었다. 제품의 품질 면에서 유청발효물 10%, 보존성 면에서 유청발효물 15%를 첨가하는 것이 효과가 있을 것으로 기대된다. This study evaluated the effect of whey brew cultured by Lactobacillus helveticus ATCC 55163 and Propionibacterium acidipropionici 5020 on bread quality characteristics. Ten and 15% whey brew were added to flour-based bread, after which bread volume, pH, total titratable acidity (TTA), moisture content, water activity, texture, organic acid content, and sensory evaluation were analyzed. The bread volume and TTA of control were the largest among the samples, whereas pH was the lowest. Moisture content did not significantly differ depending on the amount of whey brew added, though water activity was highest in the bread with 10% whey brew. However, hardness was the lowest in bread with 10% whey brew. Propionic acid was not detected while succinic acid, lactic acid, and acetic acid were detected in small amounts in the control compared to the test samples. Succinic acid, acetic acid, and lactic acid content was high in bread with 15% whey brew, with propionic acid present at a very high amount. In terms of sensory evaluation, bread with 10% whey brew had the highest score. As a result, high quality characteristics were associated with the bread with 10% whey brew, whereas long preservation was a characteristic of the bread with 15% whey brew.

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