Effect of Extract from Glycyorrhiza uralensis and Curcula longa on Shelf-life and Quality of Bread

This study examined the improvement of bread quality with Curcula longa and Glycyorrhiza uralensis extract (CGE). When counted, the viable cell number in bread with 5% of CGE dramatically was decreased by about 1 log cycle as compared to that of bread without CGE. With regard to oxidation, the content of malonaldehyde diminished in breads with increasing amounts of CGE. Breads with 1 and 5% of CGE were shown to have the highest antioxidative effect. The moisture contents of bread with CGE and bread without CGE were not much different during the early storage period. After six days of storage, however, the moisture contents of bread without CGE and bread with 0.5% of CGE decreased about 16%. On the other hand, the moisture contents of bread with 1% and 5% of CGE did not change dramatically. Their moisture content was decreased by only 4% during the same storage period. Although color, lightness and redness gradually diminished with increasing amounts of CGE in bread, conversely yellowness increased. In the sensory evaluation, bread with 0.5% and 1% of CGE scored the highest: 3.66 and 3.67 out of 5, respectively. Bread with 5% of CGE scored the lowest of the various bread tested. From these results, the addition of 1% CGE in bread had a good effect on improvement of preservation and development of quality.

감초와 강황 추출물 첨가에 의한 식빵의 저장성 및 품질 증진 효과

감초와 강황 물 추출혼합물을 0.5%, 1%, 5%농도로 첨가하여 제조한 식빵의 품질특성을 조사하였다. 저장성은 추출 혼합물 5% 처리구에서 무처리구에 비해 약 24시간정도 연장되었으며, 산화도는 처리농도가 증가함에 따라 감소되는 경향을 있어 산화방지에도 효과가 있었다. 수분함량의 변화에 있어서는 추출혼합물 처리구가 약 4%정도의 적은 변화인 반면 무처리구는 16%정도로 그 변화폭이 컸다. 색도의 경우 추출물의 첨가농도가 증가할수록 명도와 적색도는 감소하였으며, 황색도는 증가하였다. 관능평가에서는 전체적인 호감도에서 0.5%와 1% 첨가구와 무처리구에 비해 높은 점수를 받았으나 5% 첨가구는 가장 낮은 점수를 받았다. 이상의 결과를 종합해 볼 때 감초와 강황 추출물을 1%정도 첨가할 경우 저장성, 품질증진 및 관능개선에 효과가 있을 것으로 사료된다.