Whey Protein/Casein Ratio and Nonprotein Nitrogen in Preterm Human Milk During the First 10 Days Postpartum
| Autor: | Samuel Flores-Huerta, Guadalupe Matute, Claudia Serrano, Bárbara Urquieta, Rocío Espinosa, Vı́ctor Manuel Sánchez-Hidalgo |
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| Rok vydání: | 1998 |
| Předmět: |
Whey protein
medicine.medical_specialty Time Factors Nitrogen chemistry.chemical_element Gestational Age Calcium Animal science Internal medicine Lactation Casein Humans Medicine Polyacrylamide gel electrophoresis Milk Human business.industry Gastroenterology Caseins Gestational age Milk Proteins Whey Proteins Isoelectric point Endocrinology medicine.anatomical_structure chemistry Pediatrics Perinatology and Child Health Gestation Electrophoresis Polyacrylamide Gel Female business Infant Premature |
| Zdroj: | Journal of Pediatric Gastroenterology & Nutrition. 26:64-69 |
| ISSN: | 0277-2116 |
| Popis: | Background: This study was designed to describe the longitudinal changes in the casein and whey fractions and the total and nonprotein nitrogen contents of preterm human milk for the first 10 days postpartum. Methods: Eleven mothers delivering at 30 to 34 weeks of gestation were studied, six throughout the first 10 days and five on the first postpartum day . Four milk samples were collected every day by expression of one breast with an electric breast pump. Casein and whey protein were separated from the defatted milk by isoelectric precipitation in calcium chloride and by subsequent ultracentrifugation. The milk nitrogen content was determined before and after acid precipitation. Whey protein and casein were characterized by electrophoresis in polyacrylamide gel. Results: Total and protein nitrogen showed a sharp decrease during the first 3 postpartum days, whereas the nonprotein nitrogen did not change markedly (mean concentration. 0.58 mg.ml -1 ). Casein content expressed as nitrogen in preterm human milk was 0.35 mg.ml -1 between days 3 and 5 and 0.60 mg.ml -1 between days 6 and 10. The whey protein-casein ratio before day 2, was 100:0, at day 3, 86:14, at day 5, 76:24. and at day 1(), 70:30. Three days after delivery, casein levels rose progressively, increasing markedly alter day 6. Conclusions: These findings suggest that delivering before term affects neither casein production nor its chemical characteristics. |
| Databáze: | OpenAIRE |
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