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Preparation of Egg White Liquid Hydrolysate (ELH) and Its Radical-Scavenging Activity

  • Noh, Dong Ouk (Department of Hotel Culinary Arts and Nutrition, Kaya University) ;
  • Suh, Hyung Joo (Department of Food and Nutrition, Graduate School, Korea University)
  • Received : 2015.06.02
  • Accepted : 2015.07.21
  • Published : 2015.09.30

Abstract

In the present study, an optimum protease was selected to hydrolyze the egg white liquid protein for the antioxidant peptides. Alcalase treatment yielded the highest amount of ${\alpha}$-amino groups (15.27 mg/mL), while the control (no enzymatic hydrolysis) showed the lowest amount of ${\alpha}$-amino groups (1.53 mg/mL). Alcalase also gave the highest degree of hydrolysis (DH) value (43.2%) and was more efficient for egg white liquid hydrolysis than the other enzymes. The Alcalase hydrolysate had the highest radical-scavenging activity (82.5%) at a concentration of 5.0 mg/mL. The conditions for enzymatic hydrolysis of egg white liquid with Alcalase were selected as substrate : water ratio of 2:1. Five percent Alacalse treatment did not show significant (P>0.05) increases of DH and ${\alpha}$-amino nitrogen content after 24 hhydrolysis. Thirty two hour-hydrolysis with 5% Alcalase is sufficient to make antioxidative egg white liquid hydrolysate from egg white liquid. DPPH and ABTS radical-scavenging activities were significantly (P<0.05) higher after enzymatic digestion. These results suggest that active peptides released from egg-white protein are effective radical-scavengers. Thus, this approach may be useful for the preparation of potent antioxidant products.

Keywords

egg-white liquid;hydrolysate;radical scavenger;Alcalase

Acknowledgement

Supported by : Kaya University

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