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Enzymatic Hydrolysis Optimization of a Snow Crab Processing By-product  

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)
Publication Information
Korean Journal of Food Science and Technology / v.41, no.6, 2009 , pp. 622-627 More about this Journal
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.
Keywords
snow crab processing by-product; enzymatic hydrolysis; flavor; response surface methodology;
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