A new method for purifying N-Glycans released from milk glycoprotein

Area of Science:

• Biochemistry
• Food Science
• Analytical Chemistry

Background:

• Human milk provides essential bioactive components, with human free oligosaccharides (HMOs) being a major constituent.
• Infant formulas based on bovine milk are common alternatives, but differences in composition warrant investigation.
• HMOs can interfere with the analysis of N-glycans on glycoproteins in human milk.

Purpose of the Study:

• To develop a method for removing HMOs to enable thorough N-glycan purification from human milk.
• To compare N-glycosylation and glycoprotein profiles between human and bovine milk.
• To provide insights for optimizing infant formula composition.

Main Methods:

• Combined acetone precipitation with filter-aided sample preparation (FASP) to remove HMOs and purify N-glycans.
• Utilized MALDI-TOF MS for N-glycan analysis of purified samples.
• Employed lectin blotting to compare glycoprotein differences between human and bovine milk.

Main Results:

• Successfully removed HMOs and purified N-glycans from pooled human milk.
• Identified significant differences in N-glycan patterns and glycoprotein abundance between human and bovine milk.
• Reported distinct glycoprotein profiles in human versus bovine milk.

Conclusions:

• The developed method enables accurate N-glycan analysis by effectively removing HMOs.
• Significant variations in milk glycoproteins exist between humans and bovines.
• Findings offer valuable data for the food industry in adjusting infant formula composition.