홍국 발효액종이 식빵반죽의 레올로지 특성에 미치는 영향

Abstract

홍국 배아미 5%와 10% 벌꿀용액으로 제조한 홍국 발효액종을 10-40% 첨가하여 밀가루 반죽의 레올로지 특성으로 falling number, RVA(rapid visco analyzer), farinograph, alveograph 등을 분석하였다. 홍국 발효액종 첨가량이 증가할수록 falling number 값이 낮아졌으며 10% 첨가시 <TEX>$363{\pm}7.8s$</TEX>, 20% 첨가시 <TEX>$318{\pm}2.1s$</TEX>이었다. 호화도 특성에서 홍국 발효액종 첨가량이 증가할수록 초기점도 온도와 breakdown은 상승하였고, 최고점도와 set-back값은 낮아졌다. Farinograph에서 대조구와 시험구간에 흡수율은 64.3-65.0%로 유의적 차이가 없었으나 반죽형성시간은 발효액종의 첨가량이 증가할수록 빨라졌고, 안정도는 저하되어 20% 첨가시는 9.3 min, 40% 첨가시는 3.0 min이었으며 약화도도 빨라졌다. Alveograph에서 <TEX>$P_{max}(mm)$</TEX>는 대조구가 158.0 mm이었으나 발효액종 첨가량이 많을수록 증가하여 40% 첨가시 190.0 mm이었다. 그러나 L, G, W 등의 값은 낮아졌다. 이상의 실험으로 홍국 발효액종을 20% 첨가까지는 반죽의 레올로지 특성인 제빵적성에 영향이 적어 빵 제조가 가능한 것으로 나타났다. Liquid-state fermentation of Monascus koji was performed using 10% honey as the nutrient source. The rheological characteristics of flour doughs with added red koji broth were evaluated and revealed the following results. The falling number which represents the paste characteristics decreased, as the amount of added red koji broth increased. Adding 10% broth resulted in a falling number of <TEX>$363{\pm}7.8s$</TEX> and with 20% it was <TEX>$318{\pm}2.1s$</TEX>. In the measurement of gelatinization using a rapid visco analyzer, increasing the red koji broth decreased peak viscosity, peak viscosity time, holding strength, final viscosity and set-back values, but initial pasting temperature and breakdown value increased. In the farinograph measurements, no significantly different absorption was found between the control and the treatments, and the results were 64.3-65.0%. The consistency and tolerance index of the doughs were higher in the treatments than the control. Increasing the broth addition ratio increased the measurement values, however development time and time to break down the doughs decreased. Stability also decreased and adding 20% broth resulted in a 9.3 min development time, and adding 40% broth resulted in a 3.0 min development time. In the alveographic analysis, the <TEX>$P_{max}$</TEX> (overpressure) value of the control was 158.0 mm. <TEX>$P_{max}$</TEX> value increased to 190.0 mm after adding 40% broth. However the values of L, G and W were higher in the control. As a result, little influence on dough rheology was observed by adding red koji broth 20%.