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The antimicrobial function of milk lipids.

¹Department of Developmental Biochemistry, Institute for Basic Research, 1050 Forest Hill Road, Staten Island, NY 10314, USA.

Advances in Nutritional Research

|January 25, 2002

Summary

Milk lipids possess antimicrobial properties, protecting infants from infections. Supplementing banked milk with these lipids could enhance infant immunity and reduce pathogen transmission.

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Area of Science:

Biochemistry
Immunology
Neonatal Nutrition

Background:

Milk lipids function as nutrients and antimicrobial agents.
Lipid fraction of milk gains antimicrobial activity in the infant gut via lipolysis.
Antimicrobial milk lipids are crucial for neonates with underdeveloped immune systems.

Purpose of the Study:

To investigate the antimicrobial properties of milk lipids.
To understand the mechanism of lipid-dependent antimicrobial activity in milk.
To explore the potential for supplementing banked human milk with antimicrobial milk lipids.

Main Methods:

Analysis of lipolytic activity in milk.
Identification of antimicrobial fatty acids and monoglycerides.
Assessment of microbial inactivation by milk lipids and purified components.

Main Results:

Milk triglycerides are converted to antimicrobial fatty acids and monoglycerides in the gastrointestinal tract.
Antimicrobial activity is attributed to medium-chain saturated and long-chain unsaturated fatty acids and their monoglycerides.
Microbial inactivation is rapid, occurring via membrane destabilization, and is concentration-dependent.

Conclusions:

The antimicrobial activity of milk lipids can be replicated with purified fatty acids and monoglycerides.
Supplementing banked human milk could provide immediate lipid-dependent antimicrobial activity.
This supplementation may reduce the risk of mother-to-infant viral transmission and pathogen transmission during birth.

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