Sensory Characteristics of Doenjang with Added Licorice Powder as Assessed by Response Surface Methodology

The followings describes the result of making doenjang with added licorice (Glycyrrhiza uralensis) powder. and investigating its sensory characteristics and physicochemical quality. General preference was high at 20% salinity and 2% licorice (LD204), and 16% salinity and 2% licorice (LD162). The moisture content was unchanged in the control group, while it was reduced in LD204 and LD162 in the first week of fermentation, but showed little change after then. pHs were all in the range 5.90~5.97 on day 0, but decreased from 5.90 to 5.72 in the control group in the fifth week. LD204 changed from 5.95 on day 0to 5.42 in the first week, and then it gradually increased again and became 5.93 in the fifth week, which was similar to that of day 0. LD162 was 5.97 on day 0 and showed cyclic slight increases and decreases in the first week. It increased to 6.32 in the fifth week, which was higher than that of day 0 that is, its pH was higher than that of LD204. The acidity showed a difference right after it was made. In the control group, lactic acid content gradually increased from 0.16% on day 0 to the highest, 0.59%, in the fourth week. It slightly decreased in the fifth week. LD204 slowly increased from 0.25% on day 0 to a maximum, 0.50%, in the fourth week. It also slightly decreased in the fifth week, quite similarly to that of the control group. LD162, gradually increased from 0.22% on day 0 to the highest, 0.49, in the third week, and decreased after the fourth week. Salinity was 29.5%, 22.0%, and 18% in each of the control group, LD204, and LD162 on day 0 but increased to 34.0%, 29.0%, and 26.0% in the fifth week. Soluble solid was $32^{\circ}Brix$, $28^{\circ}Brix$, and $26^{\circ}Brix$ in each of the control group, LD204, and LD162 on day 0, but slightly increased to $40^{\circ}Brix$, $32^{\circ}Brix$, and $30^{\circ}Brix$ on the fifth day. It is thought that because of the sweetness of licorice, the higher-salinity doenjang earned a higher sensory test score than that of traditional doenjang. If its salinity is lowered a little, it could be used as a sauce, even possibly having medical effects as well.

반응표면분석법을 이용한 감초분말 첨가 된장의 관능적 특성

감초분말을 첨가하여 된장을 제조한 후 관능특성 및 이화학적 품질특성을 조사한 결과는 다음과 같다. 전반적인 기호도는 소금 농도 20%, 감초분말 4%(LD204) 첨가한 된장과 소금 농도 16%, 감초분말 2%(LD162) 첨가하여 제조한 된장이 우수하였다. 수분함량 변화는 대조군은 수분함량에 변화가 없었으나, LD204와 LD162는 숙성 1주일째 수분함량이 감소한 후 이후에는 거의 변화가 없었다. pH는 0일째 5.90~5.97로 비슷하였으나, 5주째 대조군은 5.90에서 5.72로 낮아졌으며, LD204는 0일째 5.95에서 1주째 5.42로 낮아진 이후 다시 서서히 높아져 5주째 5.93 으로 0일째와 비슷하였다. LD162는 0일째 5.97에서 1주째 소폭 증가 감소를 반복하여 5주째 6.32로 0일째보다 증가하였으며, LD204보다 pH가 높았다. 산도는 담금 직후부터 차이를 나타내어 대조군은 0일째 0.16%에서 서서히 증가하여 4주째 젖산 함량이 0.59%로 가장 높았으며 5주째는 소폭 감소하였다. LD204는 0일째 0.25%에서 서서히 증가하여 4주째 젖산 함량이 0.50%로 가장 높았으며 5주째 소폭 감소하여 대조군과 비슷한 경향이었다. LD162는 0일째 0.22%에서 서서히 증가하여 3주째 0.49로 가장 높았으며 4주 이후 감소하는 경향이었다. 염도는 0일째 대조군이 29.5%, LD204는 22.0%, LD162는 18%였으나 5주째 각각 34.0%, 29.0% 및 26.0%로 증가하였다. 당도는 0일째 대조군이 $32^{\circ}Brix$, LD204는 $28^{\circ}Brix$, LD162는 $26^{\circ}Brix$였으나 5일째 각각 $40^{\circ}Brix$, $32^{\circ}Brix$ 및 $30^{\circ}Brix$로 소폭 증가하였다. 재래된장보다 높은 염도에서 관능점수가 높게 나온 것은 감초의 감미 때문인 것으로 판단되나 앞으로 염도를 조금 더 낮춰준다면 약리성을 가지는 장류가 될 수 있을 것으로 판단된다.