Plant food

Reduction in antinutritional and toxic components in plant foods by fermentation


Journal: Food Research International

 Publication Date: 03/1994

 Summary: Plant products used to produce fermented foods may contain significant anti-nutritional and toxic compnenets that interfere with mineral absorbtion and digestibility of food. Fermentation may decrease the amount of these toxins and anti-nutrients.

Soy protein, phytate, and iron absorption in humans


Journal: The American Journal of Clinical Nutrition

Publication Date: 09/1992

Summary: 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 of soy-protein isolates with different phytate contents. Iron absorption increased four- to fivefold when phytic acid was reduced from its native amount of 4.9–8.4 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 of virtually 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.


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