Is Lactoferrin Supplementation Beneficial for All Preterm Infants?

Area of Science:

• Human milk composition and immunology
• Neonatal nutrition and infant health

Background:

• Human milk (HM) possesses antibacterial properties attributed to immune modulators like lactoferrin (LF).
• Understanding factors influencing LF levels is crucial for optimizing infant nutrition.

Purpose of the Study:

• To investigate the impact of human milk maturation, fortification, and storage conditions on lactoferrin (LF) levels.
• To assess the effect of these factors on the antibacterial properties of human milk.

Main Methods:

• Human milk samples from preterm and term mothers (n=30) were analyzed for LF levels using ELISA.
• Antibacterial activity was determined by measuring inhibition of *Escherichia coli* growth.

Main Results:

• Preterm HM exhibited the highest LF levels in the first week of lactation, with significant decreases upon storage at 4°C.
• Preterm HM showed lower LF levels and antibacterial activity compared to term HM.
• Donor HM, even with HM-based fortification, was deficient in LF; supplementation improved its antibacterial activity.

Conclusions:

• Storage conditions and milk maturity significantly affect human milk lactoferrin (LF) levels.
• Donor HM and infant formulas may require LF supplementation to confer adequate antibacterial properties.
• Preterm infants receiving donor HM, formula, or stored HM at 4°C could benefit from LF supplementation.