A simple and efficient method for preparing partially purified phosvitin from egg yolk using ethanol and salts

Area of Science:

• Food Science
• Biochemistry
• Protein Chemistry

Background:

• Phosvitin, a phosphoprotein rich in serine residues, is a major component of egg yolk.
• Its unique properties make it valuable for various applications, but efficient large-scale extraction remains a challenge.

Purpose of the Study:

• To develop a novel, scalable protocol for isolating phosvitin from egg yolk.
• To optimize the use of ethanol and salts for efficient lipid removal and phosvitin extraction.

Main Methods:

• Egg yolk was diluted and pH-adjusted to precipitate yolk granules containing phosvitin.
• Lipids were removed using optimized ethanol concentrations.
• Phosvitin was extracted from lipid-free granules using ammonium sulfate or sodium chloride.
• Ultrafiltration and freeze-drying were employed for purification and concentration.

Main Results:

• The optimized protocol achieved high phosvitin recovery rates (up to 97% with NaCl) and purity (approx. 85%).
• 10% ammonium sulfate or 10% NaCl at pH 4.0 proved most effective for phosvitin extraction.
• The method successfully removed lipids, salts, and impurities, yielding a partially purified phosvitin product.

Conclusions:

• A simple, effective, and scalable method for partially purifying phosvitin from egg yolk has been established.
• The developed protocol utilizes safe reagents (ethanol, salts) and techniques (ultrafiltration), making the product suitable for human consumption.
• This method offers a viable solution for the large-scale production of valuable phosvitin.