Antimicrobial proteins in sterilised human milk

Area of Science:

• Neonatal nutrition
• Food science
• Immunology

Background:

• Human milk contains vital immune factors like IgA and lactoferrin, crucial for infant infection resistance.
• Preterm infants often receive pooled human milk, necessitating sterilization procedures.

Purpose of the Study:

• To evaluate the impact of different sterilization methods on key immune proteins in human milk.
• To determine the most effective and least damaging sterilization technique for infant nutrition.

Main Methods:

• Standard heat sterilization, pasteurization, and gamma irradiation were applied to human milk samples.
• Samples were analyzed for the presence and integrity of IgA and lactoferrin post-treatment.
• Sterility was assessed after artificial contamination to evaluate sterilization efficacy.

Main Results:

• Standard heat sterilization rendered IgA and lactoferrin undetectable.
• Pasteurization effectively sterilized milk, even with heavy contamination, while preserving protein integrity.
• Gamma irradiation achieved sterilization but caused some denaturation of IgA and lactoferrin.

Conclusions:

• Routine sterilization may not be necessary for most human milk samples due to low contamination levels.
• If sterilization is required, pasteurization is recommended to preserve essential immune proteins like IgA and lactoferrin.
• Minimizing protein damage during sterilization is critical for maintaining the immunological benefits of human milk for infants.