Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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The Quality Characteristics of Rice Mash by Mixing Ratios of Rice and Rice Koji

쌀과 미입국의 배합비율에 따른 쌀 당화액의 품질특성

  • Kim, Jin-Sook (Dept. of Agro-food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Lee, Ji-Hyun (Dept. of Agro-food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Chang, Young-Eun (Dept. of Agro-food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Gi-Chang (Dept. of Agro-food Resources, National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Kyung-Mi (Dept. of Agro-food Resources, National Academy of Agricultural Science, Rural Development Administration)
  • 김진숙 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 이지현 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 장영은 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김기창 (농촌진흥청 국립농업과학원 농식품자원부) ;
  • 김경미 (농촌진흥청 국립농업과학원 농식품자원부)
  • Received : 2013.10.07
  • Accepted : 2013.12.06
  • Published : 2013.12.31
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Abstract

The effects of Aspergillus oryzae rice koji (AO) and Asp. kawachii rice koji (AK) as enzyme preparations, on the quality characteristics of rice mash were invested in this study. The amount of AORM (Asp. oryzae rice mash) and AKRM (Asp. kawachii rice mash) were 50, 100, 200% (w/w) based on 100 g of rice. Firstly, in the titer measurement result on the ${\alpha}$-amylase and glucoamylase activities of AO and AK. On the other hand, the acid protease activity has values of 31.56 unit for AO and 849.17 unit for AK. The sugar solid of the AORM and AKRM groups significantly increased as the rice koji ratio on rice was higher, which were shown with values as high as 17.63~20.53 and 17.51~19.28, respectively. Glucose and maltose were detected for free sugar of AORM. Only glucose was found in AKRM. Citric acid, malic acid, and lactic acid were detected as the organic acid of KORM; oxalic acid, citric acid, and succinic acid were detected for AKRM, and the content increased as the rice koji ratio on rice increased (P<0.05). From the above result, rice koji with useful mold is expected to be used broadly in foods by looking at the fact that it has starch degradation ability and organic acid producibility.

본 연구는 쌀과 Asp. oryzae와 Asp. kawachii 균주를 갖는 미입국의 배합비를 달리하여 제조한 쌀 당화액의 품질특성을 조사하였다. 쌀 당화액의 효소제인 미입국종류별 ${\alpha}$-amylase와 glucoamylase의 효소 역가는 Asp. oryzae 미입국에서 129.06, 22.35 unit이었고 Asp. kawachii의 미입국에서는 9.18, 12.92 unit이었다. 반면에 acid protease 효소 역가는 Asp. oryzae의 미입국에서 31.56 unit, Asp. kawachii의 미입국에서는 849.17 unit이었다. AORM 처리군은 쌀에 대한 미입국의 비율이 높을수록 pH와 총산도 모두가 감소하였으나, AKRM 처리군은 pH는 낮아진 반면, 총 산도는 높아지는 것으로 나타났다. AORM과 AKRM 처리군의 가용성 고형분은 쌀에 대한 미입국의 비율이 높을수록 증가하였다. AORM과 AKRM 처리군에서 쌀에 대한 미입국비율이 높아질수록 L값은 각각 76.26~70.56, 80.23~78.17로 감소된 반면에 a값은 각각 0.05~1.32, -1.03~-0.66이고 b값은 각각 9.66~12.51, 6.75~9.55로 증가하였다. AORM 처리군과 AKRM 처리군의 점도는 쌀에 대한 미입국 비율이 높을수록 각각 5,517.5~1,062.5, 5,977.5~2,305.0 cP로서 감소하였다. AORM 처리군과 AKRM 처리군의 당고형분 함량은 각각 17.63~20.53, 17.51~19.28로 쌀에 대한 미입국 비율이 높을수록 증가하였다. 쌀에 대한 미입국 배합비에 따른 AORM 처리군의 유리당 함량은 glucose 2.84, 4.61 및 6.59 mg, maltose는 1.50, 1.72 및 2.22 mg으로 비율이 높아질수록 증가되었다. AKRM 처리군의 유리당은 glucose만 검출되었고 이때 함량은 각각 4.27, 5.82, 7.31 mg이었다. AORM 처리군의 유기산은 citric acid, malic acid, lactic acid가 검출되었고 AKRM 처리군의 유기산은 oxalic acid, citric acid 및 succinic acid가 검출되었는데, 이들 처리군 모두 쌀에 대한 미입국비율이 높아질수록 총 유기산 함량은 증가하였다. 이상으로 부터 Asp. oryzae, Asp. kwachii 균주의 미입국이 당과 산의 생성능력이 다르므로 당과 산 생성을 고려한 식품가공에 응용될 수 있을 것으로 기대한다. 따라서 다양한 유용 균주를 갖는 미입국을 포함한 곡류 입국이 다양한 전분 소재에 대한 효소제로서 술, 장, 죽, 음료, 잼 등에 접목될 때 기존제품과 다른 새로운 가공제품 생산이 가능할 것으로 예상된다.

Keywords

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