Enzymatic Hydrolysis Optimization of a Snow Crab Processing By-product

홍게 가공부산물의 효소적 단백질 가수분해 최적화

  • Jang, Jong-Tae (Department of Food Engineering, Dankook University) ;
  • Seo, Won-Ho (Department of Food Engineering, Dankook University) ;
  • Baek, Hyung-Hee (Department of Food Engineering, Dankook University)
  • 장종태 (단국대학교 식품공학과) ;
  • 서원호 (단국대학교 식품공학과) ;
  • 백형희 (단국대학교 식품공학과)
  • Published : 2009.12.31

Abstract

The objectives of this study were to evaluate a protease suitable for the enzymatic hydrolysis of a snow crab processing by-product (SPB) and to optimize the hydrolysis conditions using response surface methodology (RSM). The SPB was hydrolyzed at $50^{\circ}C$ and pH 7.0-7.2 to obtain various degree of hydrolysis (DH) using Flavourzyme at an enzyme/substrate (E/S) ratio of 3.0%. The reaction progress curve exhibited an initial fast reaction rate followed by a slowing of the rate. The DH was increased to 30% at 90 min with a final DH 32 to 36%. A central composite experimental design having three independent variables (reaction temperature, reaction time, and E/S ratio) with five levels was used to optimize the enzymatic hydrolysis conditions. Based on the DH data, the optimum reaction conditions for the enzymatic hydrolysis of the SPB were a temperature of $51.8^{\circ}C$, reaction time of 4 hr 45 min, and an E/S ratio of 3.8%. It was demonstrated that the enzymatic hydrolysate of SPB could be used as a flavoring agent or a source of precursors for the production of reaction flavors.

홍게 가공부산물을 고부가가치 식품소재로 이용하기 위하여 단백질 분해효소를 이용하여 가수분해하고 반응표면분석법으로 가수분해 조건을 최적화 하였다. 홍게 가공부산물을 단백질 분해 효소인 Flavourzyme으로 가수분해한 결과 효소반응곡선은 반응 초기 빠른 반응속도를 나타내다가 이 후에 느려지는 전형적인 형태를 나타내었다. 반응초기 90분까지 가수분해도는 30%까지 증가하다가, 이후 최종적으로 32-36%를 나타내었다. 최적화를 하기 위한 가수분해 요인변수로는 반응온도, 반응시간 및 홍게 가공부산물에 대한 Flavourzyme의 양을 선정하였고, 5개의 수준에서 부호화하여 이들을 중심합성설계법을 이용하여 반응표면분석을 실시하였다. 홍게 가공부산물을 Flavourzyme을 이용하여 반응표면 분석법으로 가수분해 조건을 최적화한 결과, 온도 $51.8^{\circ}C$, 반응시간 4시간 45분, 홍게 가공부산물에 대한 Flavourzyme의 양 3.8%로 나타났다. 홍게 가공부산물 효소분해물은 향미소재 및 반응향 제조의 전구물질로서 이용할 수 있을 것이다.

Keywords

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