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Journal of Human Lactation
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Assays for Endogenous Components of Human Milk

Comparison of Fresh and Frozen Samples and Corresponding Analytes in Serum

Erin P. Hines, PhD

Jennifer L. Rayner, PhD

Randy Barbee, BS

Rae Ann Moreland, BS

Andre Valcour, PhD, DABCC

Judith E. Schmid, MS

Suzanne E. Fenton, PhD

Breast milk is a primary source of nutrition that contains many endogenous compounds that may affect infant development. The goals of this study were to develop reliable assays for selected endogenous breast milk components and to compare levels of those in milk and serum collected from the same mother twice during lactation (2-7 weeks and 3-4 months). Reliable assays were developed for glucose, secretory IgA, interleukin-6, tumor necrosis factor-a, triglycerides, prolactin, and estradiol from participants in a US EPA study called Methods Advancement in Milk Analysis (MAMA). Fresh and frozen (—20°C) milk samples were assayed to determine effects of storage on endogenous analytes. The source effect (serum vs milk) seen in all 7 analytes indicates that serum should not be used as a surrogate for milk in children's health studies. The authors propose to use these assays in studies to examine relationships between the levels of milk components and children's health. J Hum Lact. 23(2):144-156.

Key Words: human milk • cytokines • immunoglobulins • surrogate • biomonitoring

Journal of Human Lactation, Vol. 23, No. 2, 144-156 (2007)
DOI: 10.1177/0890334407300334
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