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Comparison of Free Amino Acids and Nucleotides Content in the Olive Flounder Paralichthys olivaceus Fed with Extruded Pellet

건조 배합사료로 사육한 넙치 어육의 유리아미노산 및 핵산 관련 성분의 비교

  • Jang, Mi-Soon (Food and Safety Research Center, National Fisheries Research & Development Institute) ;
  • Park, Hee-Yeon (Food and Safety Research Center, National Fisheries Research & Development Institute) ;
  • Kim, Kang-Woong (Aquafeed Research Center, National Fisheries Research & Development Institute) ;
  • Kim, Kyoung-Duck (Aquafeed Research Center, National Fisheries Research & Development Institute) ;
  • Son, Maeng-Hyun (Aquafeed Research Center, National Fisheries Research & Development Institute)
  • 장미순 (국립수산과학원 식품안전과) ;
  • 박희연 (국립수산과학원 식품안전과) ;
  • 김강웅 (국립수산과학원 사료연구센터) ;
  • 김경덕 (국립수산과학원 사료연구센터) ;
  • 손맹현 (국립수산과학원 사료연구센터)
  • Received : 2011.05.02
  • Accepted : 2011.10.07
  • Published : 2011.10.30

Abstract

This study analyzed the taste components of dorsal muscle and fin muscle collected from olive flounder cultured with extruded pellet (EP) compared with those of olive flounder cultured with raw fish moist pellet (MP) as a control. The olive flounder in this study were cultured for 10 months with either the formulated extrude pellets (FEP), commercial extruded pellets (CEP) or the MP feed, and the average weight was 1.15 kg. The major nucleotides and related compounds in the dorsal muscles of the fish fed with MP, CEP and FEP diets were AMP and IMP. The fin muscle of the olive flounder contained the largest amounts of IMP($5.91{\mu}mol/g$). The K value of the dorsal muscle in olive flounder fed with MP, CEP and FEP showed 9.63%, 9.83% and 5.84%, respectively. The free amino acids in the dorsal muscle of olive flounder showed significantly differences in the composition depending on the feed, but the distribution of free amino acids showed similar patterns. Among free amino acids, taurine showed the highest content in all the experimental groups, and the asparagine and citrulline contents were significantly higher in the groups fed with CEP and FEP than in the group fed with MP. The significant differences were observed in the contents of specific free amino acids in dorsal muscle and fin flesh depending on the feed for cultured olive flounder.

배합사료를 공급한 양식 넙치와 생사료를 공급한 양식넙치의 핵산 관련 물질 및 유리아미노산 측정을 통한 품질의 차이를 비교하였다. 넙치 등근육의 핵산관련물질은 모든 실험사료구에서 공통적으로 AMP 함량이 가장 높았고 그 다음으로 IMP의 함량이 높았다. 공급한 사료에 따라서 HxR의 성분에는 유의적인 차이(p<0.05)를 보였으나, 핵산 관련물질 조성의 분포양상은 비슷한 경향을 나타내었다. 또한, 넙치 지느러미살의 핵산 관련 물질 조성 중 공급한 사료의 종류에 상관없이 IMP 함량이 공통적으로 가장 높게 나타났으나 함량에는 유의적인 차이를 보이지 않았다. 한편, 어육의 초기 변화 정도를 측정하는 K value는 넙치 등근육에서 MP, CEP 및 FEP의 공급구가 각각 9.63%, 9.83% 및 5.84%를 나타내었고, 넙치 지느러미 살에서는 각각 15.71%, 11.22% 및 17.60%를 나타내었다. 넙치를 사육하는 동안 공급하는 사료의 종류에 따라 등 근육 및 지느러미살의 특정 유리아미노산 함량에는 유의적인 차이가 있으나, 전반전인 유리아미노산의 조성에는 큰 차이가 없었다. 유리아미노산 중에서 taurine 함량이 모든 실험사료구에서 공통적으로 가장 높았고, CEP 및 FEP 공급구는 asparagine과 citrulline의 함량이 MP 공급구보다 높았다. 이처럼, 넙치를 사육하는 동안 공급하는 사료의 종류에 따라 등근육 및 지느러미살의 특정 유리아미노산의 함량에 차이가 나는 것으로 볼 때, 맛과 풍미에 큰 영향을 미치는 유리아미노산 조성의 규명은 기호도를 예측할 수 있는 효과적인 방법이라 생각된다.

Keywords

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