The bran has a high content of bioelements which, unfortunately, are complexes by phytic acid. The hydrothermic treatment, under conditions which allow the phytase activity, was found to be an efficient process which reduces the quantity of the phosphor-ester in the favor of soluble phosphor. Whole meal rye and the bran obtained from hydrothermal treated rye can be used as sources of fibers with a reduced content of phytates. Depending on flour quality, they can be used as supplements, within 20-25%, for bread manufacturing. The aim of this study was to evaluate the way in which the parameters of hydrothermic treatment influence the decrease of the phosphor ester-content and transform it in soluble compounds. Our results show that a temperature of 550ºC and o concentration of the acid solution and o concentration of the acid solution used for rye soaking of 1.5% lead to higher contents of soluble phosphor.
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