Sialic acid content of infant saliva: comparison of breast fed with formula fed infants
Human Nutrition Unit, Department of Biochemistry,
University of Sydney, NSW 2006, Australia
Correspondence to: Professor Brand Miller.
Accepted 2 July 1997
Sialic acid is found in especially high
concentrations in brain gangliosides, and supplementary sialic acid is
associated with increased learning behaviour in animals. It was
hypothesised that breast fed infants may have higher concentrations of
sialic acid in body fluids and tissues because human milk is a rich
source of sialylated oligosaccharides, while formulas contain very
little. The aim therefore was to compare the sialic acid content of
saliva collected from full term infants who were either solely breast fed or formula fed until weaning at 3-5 months of age. Thirty three
infants, 18 breast fed and 15 formula fed, were studied at a mean (SD)
age of 5 (2) months. The breast fed infants, when compared with formula
fed infants, were found to have almost two times more free sialic acid
in saliva (mean (SE) 16.0 (2.7) v 8.2 (2.1) mg/l, p < 0.036) and nearly 50% more total sialic acid (47.3 (3.9)
v 32.2 (4.4) mg/l, p<0.014). The findings provide a
preliminary indication that an exogenous source of sialic acids derived
from human milk may contribute to higher concentrations of sialic acid
in body fluids. There are important implications for the formulation of
human milk substitutes.
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© 1997 by Archives of Disease in Childhood
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