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Quality Properties of Fermented Squid Viscera Product with Aspergillus oryzae Koji and Its Seasoning

Koji를 첨가하여 발효한 오징어 내장 조미료의 품질특성

  • Choi, Seung-Hwa (Dept. of Marine Food Science and Technology, Gangneung-Wonju National University) ;
  • Kim, Sang-Moo (Dept. of Marine Food Science and Technology, Gangneung-Wonju National University)
  • 최승화 (강릉원주대학교 해양식품공학과) ;
  • 김상무 (강릉원주대학교 해양식품공학과)
  • Received : 2010.09.24
  • Accepted : 2010.11.23
  • Published : 2011.01.31

Abstract

Squid (Todarodes pacificus) is processed as dried or seasoned-dried products and its catch gradually increased from 270,298 M/T in 2005 to 367,940 M/T in 2008 in Korea. Squid processing by-product (viscera) was usually discarded as a waste resulting in environmental problem. In order to utilize squid viscera for more value-added products, a natural squid seasoning was developed by fermenting with Aspergillus oryzae koji. Squid viscera at 5, 10 and 15% salt concentrations with fixed levels of 5% koji and 30% water was fermented at room temperature. The quality properties of squid fermented products such as amino-N, TMA, VBN, total viable cell count, pH and total acidity were determined at different fermentation periods. The contents of amino-N, TMA, and VBN of squid seasoning at 5% salt concentration fermented for 14 days were the highest. Based on amino-N content, squid viscera at 5% koji fermented for 14 days was selected for further assays: the content of moisture, crude protein, crude lipid, crude ash, and carbohydrate were 5.98, 35.19, 33.08, 11.30, and 14.45%, respectively. The content of glutamate, alanine, leusine and lysine were 7.06, 12.34, 9.90 and 10.22%, respectively. The $IC_{50}$ values of DPPH scavenging and $\beta$-glucuronidase inhibitory activity were 12.89 and 12.58 mg/mL, respectively. A natural squid seasoning was manufactured by mixing fermented squid viscera and an ingredient. Based on the results of sensory evaluation, the fermented squid viscera seasoning was almost equal to other natural complex seasonings such as anchovy, cow meat, and fisheries seasoning.

본 연구는 오징어 가공부산물인 내장에 koji를 첨가하여 속성 발효한 천연조미료 소재 개발을 목적으로 결과를 요약하면 다음과 같다. 휘발성 염기질소량과 trimethylamine은 대조군이 가장 급격하게 증가하였고, 식염이 많이 첨가될수록 서서히 증가하였다. pH는 대조군이 가장 급격한 변화를 보였으며, 식염이 많이 첨가될수록 pH의 변화량이 적었다. 반면, 산도는 pH 감소와 반비례하여 증가하였다. 아미노질소는 식염 5% 첨가군이 가장 짧은 기간에 최고값을 나타내었으며, 식염 10, 15% 첨가군은 식염 5% 첨가군과 비슷한 값을 보였으나 발효기간이 길어 적합하지 않았다. 따라서 이상의 결과를 고려할 때, 식염 5% 첨가군이 조미료를 만들기에 가장 적합하다고 판단하였다. 식염 5%의 농도에 14일 간 발효시킨 오징어 내장 발효생성물의 일반성분은 조단백이 가장 많았으며, 유리아미노산 조성은 단맛을 내는 아미노산인 alanine과 감칠맛을 내는 아미노산인 glutamic acid의 함량이 가장 많았다. 항산화와 항대장암 활성은 농도 의존적으로 증가하는 것을 확인하였으나, positive control에 비하여 활성이 떨어졌다. 관능검사 결과는 시판 천연조미료와 비교하여 관능적으로 큰 차이가 없었다. 이상의 결과를 고려할 때 오징어 내장 발효생성물은 천연조미료 등 식품첨가제로써 활용이 가능하다고 판단된다.

Keywords

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