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A spectrophotometric method using batho-phenantroline as reagent has been optimized for iron speciation [ionic Fe(II) and Fe(III)] in the mineral soluble (bioaccessible) fraction obtained from the in vitro digestion of food dishes. The effect of the precipitant and reducing reagents, and the amount of sodium nitrite added was studied. Heme-Fe was estimated by subtraction of ionic Fe from the total...
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