As far as selection of “vehicle” and supporting material poses no
major problems, from the consumer point of view the most significant
things, often overlooked in the design of fortified foods, are
the real value of the received nutraceutical foods, determined by
bioaccessibility and bioavailability of biologically active compounds.
The most of studies concerning bioactivity of foods deal
only with the antioxidant capacity extracted by chemical solvents
(normal antioxidant capacity assays are limited by the extraction
technique employed). But some antioxidants may remain in the
residues from organic extraction of foods. Therefore, the biological
properties of antioxidants may depend on their release from the
food matrix during the digestion process (bioaccessibility) and may
differ quantitatively and qualitatively from those produced by the
chemical extraction employed in most studies.