Iron bioavailability studies as assessed by intrinsic and extrinsic labeling techniques
Although soybeans are a rich source of iron and incorporation of soy protein into diets is increasing, the presence of phytate or fiber endogenous to the seeds may inhibit total iron absorption from diets including soy protein. Four studies on iron bioavailability as assessed by intrinsic and extrinsic labeling techniques in rats were completed. The effect of previous dietary protein on the absorption of intrinsically /sup 59/Fe labeled defatted soy flour was determined in rats. The results indicated that the type of dietary protein (animal vs. plant) in pre-test diets would have little influence on iron absorption from a single soy protein test meal. Therefore, adaptation of soy protein does not improve bioavailability of iron. Soybean hulls were investigated as a source of iron fortification in bread. The results indicated that retention of /sup 59/Fe from white bread baked with soy hulls did not differ from white bread fortified with bakery grade ferrous sulfate. The effect of endogenous soybean phytate on iron absorption in rats was measured using seeds of varying phytate content and intrinsically labeled with /sup 59/Fe. Increasing concentration of phytate in whole soybean flour had no significant effect on iron absorption.
- Research Organization:
- Purdue Univ., Lafayette, IN (USA)
- OSTI ID:
- 6942793
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Bioavailability of iron to rats from processed soybean fractions determined by intrinsic and extrinsic labeling techniques
Iron-59 absorption from soy hulls: intrinsic vs extrinsic labeling
Related Subjects
IRON
BIOLOGICAL AVAILABILITY
DIET
IRON 59
LABELLED COMPOUNDS
RATS
SOYBEANS
TRACER TECHNIQUES
ANIMALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
ELEMENTS
EVEN-ODD NUCLEI
FOOD
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
MAMMALS
METALS
NUCLEI
PLANTS
RADIOISOTOPES
RODENTS
TRANSITION ELEMENTS
VEGETABLES
VERTEBRATES
550201* - Biochemistry- Tracer Techniques