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Drip breast milk: it's composition, collection and pasteurization.

J H Gibbs, C Fisher, S Bhattacharya

    Early Human Development
    |December 1, 1977
    PubMed
    Summary
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    Drip breast milk, collected during infant suckling, is biochemically similar to expressed milk but with less fat. Heat treatment in milk banks reduces its immune factors and bacterial inhibition, though pasteurization effectively lowers bacterial counts.

    Area of Science:

    • Biochemistry
    • Immunology
    • Neonatal Nutrition

    Background:

    • Drip breast milk is spontaneously released from the breast not being suckled.
    • Approximately 15% of lactating women produce drip milk, with potential volumes up to 188 ml/donor/day.
    • Milk banks process significant quantities of drip milk, necessitating understanding of its properties and processing effects.

    Purpose of the Study:

    • To compare the biochemical and immunological properties of pooled drip breast milk with pooled mature expressed breast milk.
    • To evaluate the impact of heat treatment (pasteurization) on the immunological components and bacterial inhibitory capacity of drip breast milk.
    • To assess the efficacy of pasteurization versus boiling in reducing bacterial content.

    Main Methods:

    • Biochemical and immunological analysis of pooled drip milk and expressed breast milk.

    Related Experiment Videos

  • Processing of 1400 liters of drip milk annually by a milk bank.
  • Heat treatment using a semi-automated holder pasteurizer and comparison with boiling.
  • Assessing the impact of heat treatment on IgA concentration, lysozyme activity, and E. coli growth inhibition.

    • Main Results:

    • Pooled drip milk is biochemically and immunologically similar to pooled mature expressed breast milk, but with lower fat content.
    • Pasteurization reduced IgA concentration by 21% and lysozyme activity by 36%, decreasing bacterial inhibitory capacity.
    • Pasteurization was effective in reducing bacterial content, comparable to boiling, when initial bacterial counts were below 10(6) bacteria/ml.

    Conclusions:

    • Drip breast milk is a viable component for milk banks, sharing similarities with expressed breast milk.
    • Heat treatment, while reducing some immunological factors, effectively reduces bacterial load in drip milk.
    • Pasteurization offers a comparable bacterial reduction to boiling under specific conditions, preserving some milk benefits.