A novel isolation method for hen egg yolk antibody, "IgY"

Area of Science:

• Biochemistry
• Immunology
• Food Science

Background:

• Egg yolk is a rich source of immunoglobulin Y (IgY), a valuable protein for research and therapeutics.
• Traditional methods for IgY isolation often struggle with efficient removal of yolk lipoproteins, impacting purity and yield.
• Developing cost-effective and scalable isolation techniques is crucial for maximizing IgY utilization.

Purpose of the Study:

• To investigate a novel method for the efficient isolation of egg yolk immunoglobulin Y (IgY).
• To evaluate the efficacy of natural gums in removing yolk lipoproteins during IgY purification.
• To optimize the isolation process for high purity and yield of IgY.

Main Methods:

• Investigated the use of natural gums, specifically carrageenan and xanthan gum, for precipitating yolk lipoproteins.
• Utilized lambda-carrageenan for pronounced lipoprotein removal, reducing lipid content in the supernatant to <0.4% of original egg yolk.
• Isolated IgY from the supernatant using DEAE-Sephacel chromatography followed by sodium sulfate salting-out.

Main Results:

• Natural gums, particularly lambda-carrageenan, effectively precipitated yolk lipoproteins.
• The optimized method achieved a high IgY yield of 86% in the supernatant after lipoprotein removal.
• The isolated IgY demonstrated high purity (98%), with yields ranging from 70 to 100 mg per egg.

Conclusions:

• Natural gums offer an effective and accessible strategy for removing yolk lipoproteins, facilitating IgY isolation.
• The developed chromatographic and salting-out method yields highly pure IgY with excellent recovery.
• This method presents a promising approach for the scalable and efficient purification of egg yolk IgY.