increased significantly during chilled storage in samples without
caffeic acid added (CO and WDF); this could be connected with
losses of redness given that oxygenated heme proteins produce
a bright colour while oxidized pigments are brown (meat heme
proteins)Fish samples having high oxidative deterioration could
also show yellowness through the formation of tertiary lipid
oxidation by-products resulting from interaction of carbonyls and
amino groups of muscle proteins or peptides (Pokorný &
Ko1akowska, 2003). Considering the scarce oxidation of samples
containing wheat DF plus caffeic acid (Fig.1, Table 3), the yellowness
found cannot be attributed to the formation of these interaction
products.