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Alterations in the host defense properties of human milk following prolonged storage or pasteurization.
MedLine Citation:
PMID:  20639776     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
OBJECTIVES: Preterm infants are often fed pasteurized donor milk or mother's milk that has been stored frozen for up to 4 weeks. Our objectives were to assess the impact of pasteurization or prolonged storage at -20 degrees C on the immunologic components of human milk and the capability of the different forms of human milk to support bacterial proliferation.
MATERIALS AND METHODS: The concentrations and activities of major host defense proteins in the whey fractions of mother's milk stored for 4 weeks at -20 degrees C or pasteurized human donor milk were compared with freshly expressed human milk. Proliferation of bacteria incubated in the 3 forms of human milk was assessed.
RESULTS: Relative to freshly expressed human milk, the concentrations of lysozyme, lactoferrin, lactoperoxidase, and secretory immunoglobulin A were reduced 50% to 82% in pasteurized donor milk and the activities of lysozyme and lactoperoxidase were 74% to 88% lower (P < 0.01). Proliferation of bacterial pathogens in pasteurized donor milk was enhanced 1.8- to 4.6-fold compared with fresh or frozen human milk (P < 0.01).
CONCLUSIONS: The immunomodulatory proteins in human milk are reduced by pasteurization and, to a lesser extent, by frozen storage, resulting in decreased antibacterial capability. Stringent procedure to minimize bacterial contamination is essential during handling of pasteurized milk.
Authors:
Henry Akinbi; Jareen Meinzen-Derr; Christine Auer; Yan Ma; Derek Pullum; Ryosuke Kusano; Krzysztof J Reszka; Kira Zimmerly
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of pediatric gastroenterology and nutrition     Volume:  51     ISSN:  1536-4801     ISO Abbreviation:  J. Pediatr. Gastroenterol. Nutr.     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-09-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8211545     Medline TA:  J Pediatr Gastroenterol Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  347-52     Citation Subset:  IM    
Affiliation:
Division of Pulmonary Biology and Neonatology, Cincinnati Children's Hospital Medical Center,Cincinnati, OH, USA.
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