A longitudinal study of the protein, nitrogen, and lactose contents of human milk from Swedish well nourished mothers

B. Lonnerdal, E. Forsum, L. Hambraeus

Research output: Contribution to journalArticle

172 Scopus citations

Abstract

The contents of total nitrogen, nonprotein nitrogen, lactose, and individual milk proteins have been determined in human milk from well nourished Swedish mothers. Breast milk samples from 50 mothers at different stages of lactation (up to 170 days) were collected. Furthermore, three mothers gave samples repeatedly throughout the whole lactation period. The protein content in mature milk was found to be 0.8 to 0.9% by amino acid analysis. The nitrogen content and the contents of the major human milk whey proteins, α lactalbumin and lactoferrin, are very high for the first few das, then decrease rapidly and reach, thereafter, the more slowly declining level of mature milk. Nonprotein nitrogen and the nonspecifc milk protein serum albumin are present in constant concentrations throughout lactation. The daily milk volumes were determined and found to be 500 to 600 ml in the very early part and 700 to 800 ml in the later part of the lactation period.

Original languageEnglish (US)
Pages (from-to)1127-1133
Number of pages7
JournalAmerican Journal of Clinical Nutrition
Volume29
Issue number10
StatePublished - 1976
Externally publishedYes

ASJC Scopus subject areas

  • Food Science
  • Medicine (miscellaneous)

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