Abstract: The industrial production process of egg yolk polypeptides (EYPs) was studied using skimmed egg yolk powder as raw material. Firstly, the influences of different pretreatment methods on the yield of EYPs were investigated. Then the decolorization process was optimized based on the peptide recovery rate and decolorization rate. The main parameters were the amount of addition, the decolorization time, pH and temperature. Finally, the amino acid composition, peptide distribution, moisture and ash content of the EYPs product were analyzed. The results were as follow: the pretreatment method of crushing skimmed egg yolk powder could significantly increase the yield of EYPs to 72.6%. 10 g/L of No.7 activated carbon at pH 4.3 and 50 ℃ for 30 min had the best decolorization effect, which reached 72.34% and the peptide recovery rate was 84.76%. The EYPs product prepared by this process has a balanced amino acid composition and a peptide molecular weight suitable for human body absorption. It can effectively increase the added value of low-value skimmed egg yolk powder and broaden the egg deep processing industry line.
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2021, Vol. 47 
