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  • Title: Iron and zinc absorption in human subjects from a mixed meal of extruded and nonextruded wheat bran and flour.
    Author: Fairweather-Tait SJ, Portwood DE, Symss LL, Eagles J, Minski MJ.
    Journal: Am J Clin Nutr; 1989 Jan; 49(1):151-5. PubMed ID: 2536211.
    Abstract:
    The effect of extrusion cooking of a bran-flour mixture on iron and zinc retention was measured in normal adults. The stable isotopes 58Fe (1.253 mg) and 67Zn (5.13 mg) were administered with 40 g nonextruded or extruded cereal with milk and isotopic retention was measured from fecal excretion over the next 4-7 d by neutron-activation analysis (Fe) and fast-atom-bombardment mass spectrometry (Zn). 58Fe retention was 15.1 +/- 2.4% (means +/- SEM) with the nonextruded meal and 16.5 +/- 2.7% with the extruded meal. 67Zn retention was 18.9 +/- 1.7% with the nonextruded meal and 18.3 +/- 1.5% with the extruded meal. Extrusion cooking had no effect on 58Fe or 67Zn retention.
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