UNEQUAL DISTRIBUTION OF A STABLE ISOTOPIC CALCIUM TRACER BETWEEN CASEIN AND WHEY FRACTIONS OF INFANT FORMULAS, HUMAN-MILK AND COWS MILK

被引：8

作者：

ABRAMS, SA ^{[1
]}

VIEIRA, NE ^{[1
]}

YERGEY, AL ^{[1
]}

机构：

[1] CHILDRENS HOSP,NATL MED CTR,WASHINGTON,DC 20010

来源：

JOURNAL OF NUTRITION | 1990年 / 120卷 / 12期

关键词：

CALCIUM; HUMAN MILK; COWS MILK; INFANT FORMULAS; ISOTOPIC TRACER;

D O I：

10.1093/jn/120.12.1672

中图分类号：

R15 [营养卫生、食品卫生]; TS201 [基础科学];

学科分类号：

100403 ;

摘要：

Measurement of calcium absorption with tracers assumes a complete equilibration of tracer with milk calcium. In this study, the equilibration of tracer between the micellar casein and soluble fractions (primarily whey) of infant formulas, human milk and cow's milk was measured in vitro using milk samples enriched with Ca-42 and analyzed by thermal ionization mass spectrometry. Incomplete equilibration of tracer occurred with the micellar casein fraction of all milks. The least equilibration with micellar casein was found with premature infant formula, for which the ratio of slopes of the equilibration lines (whey/casein) was 8.5/1. These differences may be due to Ca-casein binding in cow's milk-based formulas. The effects of the lack of tracer equilibration in vivo cannot be determined. However, unequal bioavailability of casein-vs. whey-bound Ca may exist.

引用

页码：1672 / 1676

页数：5

共 21 条

[1] STRUCTURE AND STABILITY OF CASEIN MICELLES [J].