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The effects of nutrient fortification and varying storage conditions on host defense properties of human milk.
Pediatrics. 1997 Aug; 100(2 Pt 1):240-3.Ped

Abstract

OBJECTIVE

Data are scarce regarding the effects of nutrient fortification and storage on the immunoprotective properties of human milk. These effects are important considerations when feeding premature infants. We hypothesized that total bacterial colony counts (TBCC) and immunoglobulin A (IgA) concentration were not affected by the addition of fortifier even when tested under extreme storage conditions and that osmolality of fortified human milk does not increase with storage.

METHODS

Ten frozen and five fresh milk samples from mothers of premature infants were divided into fortified and unfortified milk, and stored for 72 hours at either refrigerator or room temperature. Aliquots were obtained at 0 to 72 hours for TBCC, osmolality, and total IgA, and analyzed by repeated measures analysis of variance (ANOVA).

RESULTS

Log10 TBCC in milk stored at refrigerator temperature for 0, 24, 48, and 72 hours were significantly greater in fortified vs unfortified milk; both increased similarly with storage. Osmolality was greater in fortified than unfortified milk; both increased by approximately 4% with storage. IgA concentration was not affected by fortification or storage. To simulate the usual nursery use of fortified human milk, a separate evaluation was performed. Fortified milk was stored at refrigerator temperature for 20 hours, warmed in a 40 degrees C laboratory incubator for 20 minutes, and placed in a 34 degrees C infant incubator for 4 hours. Samples for TBCC were obtained at 0, 20, and 24 hours and analyzed by repeated measures ANOVA. Log10 TBCC in fortified, refrigerated milk did not change over the 20-hour storage but increased during the simulated 4-hour usage.

CONCLUSIONS

These findings may warrant consideration when using human milk in the neonatal nursery but support recommendations to use commercially fortified human milk within 24 hours.

Authors+Show Affiliations

USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, and Texas Children's Hospital, Houston, Texas 77030, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

9240806

Citation

Jocson, M A., et al. "The Effects of Nutrient Fortification and Varying Storage Conditions On Host Defense Properties of Human Milk." Pediatrics, vol. 100, no. 2 Pt 1, 1997, pp. 240-3.
Jocson MA, Mason EO, Schanler RJ. The effects of nutrient fortification and varying storage conditions on host defense properties of human milk. Pediatrics. 1997;100(2 Pt 1):240-3.
Jocson, M. A., Mason, E. O., & Schanler, R. J. (1997). The effects of nutrient fortification and varying storage conditions on host defense properties of human milk. Pediatrics, 100(2 Pt 1), 240-3.
Jocson MA, Mason EO, Schanler RJ. The Effects of Nutrient Fortification and Varying Storage Conditions On Host Defense Properties of Human Milk. Pediatrics. 1997;100(2 Pt 1):240-3. PubMed PMID: 9240806.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effects of nutrient fortification and varying storage conditions on host defense properties of human milk. AU - Jocson,M A, AU - Mason,E O, AU - Schanler,R J, PY - 1997/8/1/pubmed PY - 1997/8/1/medline PY - 1997/8/1/entrez SP - 240 EP - 3 JF - Pediatrics JO - Pediatrics VL - 100 IS - 2 Pt 1 N2 - OBJECTIVE: Data are scarce regarding the effects of nutrient fortification and storage on the immunoprotective properties of human milk. These effects are important considerations when feeding premature infants. We hypothesized that total bacterial colony counts (TBCC) and immunoglobulin A (IgA) concentration were not affected by the addition of fortifier even when tested under extreme storage conditions and that osmolality of fortified human milk does not increase with storage. METHODS: Ten frozen and five fresh milk samples from mothers of premature infants were divided into fortified and unfortified milk, and stored for 72 hours at either refrigerator or room temperature. Aliquots were obtained at 0 to 72 hours for TBCC, osmolality, and total IgA, and analyzed by repeated measures analysis of variance (ANOVA). RESULTS: Log10 TBCC in milk stored at refrigerator temperature for 0, 24, 48, and 72 hours were significantly greater in fortified vs unfortified milk; both increased similarly with storage. Osmolality was greater in fortified than unfortified milk; both increased by approximately 4% with storage. IgA concentration was not affected by fortification or storage. To simulate the usual nursery use of fortified human milk, a separate evaluation was performed. Fortified milk was stored at refrigerator temperature for 20 hours, warmed in a 40 degrees C laboratory incubator for 20 minutes, and placed in a 34 degrees C infant incubator for 4 hours. Samples for TBCC were obtained at 0, 20, and 24 hours and analyzed by repeated measures ANOVA. Log10 TBCC in fortified, refrigerated milk did not change over the 20-hour storage but increased during the simulated 4-hour usage. CONCLUSIONS: These findings may warrant consideration when using human milk in the neonatal nursery but support recommendations to use commercially fortified human milk within 24 hours. SN - 0031-4005 UR - https://www.unboundmedicine.com/medline/citation/9240806/The_effects_of_nutrient_fortification_and_varying_storage_conditions_on_host_defense_properties_of_human_milk_ L2 - http://pediatrics.aappublications.org/cgi/pmidlookup?view=long&pmid=9240806 DB - PRIME DP - Unbound Medicine ER -