Background: This study examined technique characteristics of the immobilised Alcalase to hydrolyse egg white protein for potential allergenicity reduction. Alcalase was immobilised covalently on carboxyl-functionalised magnetic beads by carbodiimide activation. The technique characteristics of the immobilised Alcalase were investigated, followed by determining the degrees of hydrolysis (DH), immunoglobulin G (IgG) binding, and IgE binding of the digested egg white protein by immobilised Alcalase.
Results: Enzymatic activity, enzyme loading, and immobilisation yield of the prepared immobilised Alcalase were 20.55 U mg-1 , 925 mg g-1 , and 45%, respectively. Immobilised Alcalase showed maximum activity at pH 8.0 and 60 °C. Compared with free Alcalase, immobilised Alcalase exhibited better thermal and storage stability. Moreover, immobilised Alcalase can be reused 10 times and still maintained 55% of its initial activity. Partial hydrolysis of egg white protein by immobilised Alcalase can effectively reduce IgG and IgE binding of the hydrolysates.
Conclusion: This study indicates that the immobilised Alcalase can be used to hydrolyse continuously egg white protein for potential allergenicity reduction. © 2016 Society of Chemical Industry.
Keywords: egg white protein; hydrolysis; immobilised enzyme; potential allergenicity; technique characteristics.
© 2016 Society of Chemical Industry.