Food Science Commons^™

Soy Protein, Phytate, And Iron Absorption In Humans, Richard F. Hurrell, Marcel-A Juillerat, Manju B. Reddy, Sean R. Lynch, Sandra A. Dassenko, James D. Cook

Manju B. Reddy

The effect of reducing the phytate in soy-protein isolates on nonheme-iron absorption was examined in 32 human subjects. Iron absorption was measured by using an extrinsic radioiron label in liquid-formula meals containing hydrolyzed corn starch, corn oil, and either egg white or one of a series ofsoy-protein isolates with different phytate contents. Iron absorption increased four- to fivefold when phytic acid was reduced from its native amount of 49-8.4 to < 0.01 mg/g of isolate. Even relatively small quantities of residual phytate were strongly inhibitory and phytic acid had to be reduced to < 0.3 mg/g of isolate (corresponding to < 10 mg phytic acid/meal) before a meaningful increase in iron absorption was observed. However, even after removal ofvirtually all the phytic acid, iron absorption from the soy-protein meal was still only half that of the egg white control. It is concluded that phytic acid is a major inhibitory factor of iron absorption in soy-protein isolates but that other factors contribute to the poor bioavailability of iron from these products.

1992 Blueberry Research Progress Reports, Warren Hedstrom, Willem Brutsaert, David Brooks, Alfred A. Bushway, Rodney J. Bushway, Stephanie Baker, Therese M. Work, Linda J. Irvine, Mary Ellen Camire, Susan Ismail Flint, Eben Osgood, Frank A. Drummond, Constance Stubbs, Edward R. Huff, David H. Lambert, David E. Yarborough, Paul E. Capiello, Timothy M. Hess, Gill H. Lemieux, Rene Verrault, Roger Green, Delmont Emerson, H Y. Forsythe Jr, Judith A. Collins, Lixin Tian, John M. Smagula, Michele C. Marra, Kerry Apgar

Wild Blueberry Research Reports

The 1992 Blueberry Research Progress Reports pertain to and report on research conducted in 1991, and were prepared for the Maine Wild Blueberry Commission and the University of Maine Wild Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include:

1992 CSRS Progress Reports:

1. Investigation of Groundwater Resources

2. Sprinkler Irrigation

3. Investigation of Preprocess Changes Leading to Berry Spoilage

4. Effect of Fertilization and Irrigation on Blueberry Quality

5. Effects of Calcium Salts and Citric Acid on Quality of Canned Lowbush Blueberries

6. Pollination of Lowbush Blueberry by Native Bees

7. Application …