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Iron bioavailability from fresh cheese fortified with iron-enriched yeast
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Journal Article
Iron bioavailability from fresh cheese fortified with iron-enriched yeast
2017
Overview
Purpose
An iron-enriched yeast able to lyse at body temperature was developed for iron fortification of chilled dairy products. The aim was to evaluate iron (Fe) absorption from iron-enriched yeast or ferrous sulfate added to fresh cheese.
Methods
Two stable isotope studies with a crossover design were conducted in 32 young women. Fe absorption from fresh cheese fortified with iron-enriched yeast (2.5 mg
58
Fe) was compared to that from ferrous sulfate (2.5 mg
57
Fe) when ingested with fresh cheese alone or with fresh cheese consumed with bread and butter. Iron absorption was determined based on erythrocyte incorporation of isotopic labels 14 days after consumption of the last test meal.
Results
Geometric mean fractional iron absorption from fresh cheese fortified with iron-enriched yeast consumed alone was significantly lower than from the cheese fortified with FeSO
4
(20.5 vs. 28.7 %;
p
= 0.0007). When the fresh cheese was consumed with bread and butter, iron absorption from both fortificants decreased to 6.9 % from the iron-enriched yeast compared to 8.4 % from ferrous sulfate. The relative bioavailability of the iron-enriched yeast compared to ferrous sulfate was 0.72 for the cheese consumed alone and 0.82 for cheese consumed with bread and butter (
p
= 0.157).
Conclusions
Iron from iron-enriched yeast was 72–82 % as well absorbed as ferrous sulfate indicating that the yeast lysed during digestion and released its iron.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
Subject
/ Bread
/ breads
/ Butter
/ Cell Survival - drug effects
/ Cheese
/ Chemistry and Materials Science
/ Female
/ Ferrous Compounds - administration & dosage
/ Ferrous Compounds - pharmacokinetics
/ geometry
/ Humans
/ Iron
/ Iron - administration & dosage
/ Iron Isotopes - administration & dosage
/ Iron Isotopes - pharmacokinetics
/ Iron, Dietary - administration & dosage
/ Sulfate
/ women
/ Yeast
/ Yeasts
