Oxidative stress represents an imbalance between reactive oxygen
species (ROS) and cellular mechanisms for detoxifying the reactive intermediates
or for repairing the resulting damage. Disturbances in the
normal state can cause toxic effects through the production of peroxides
and free radicals that damage all components of the cell, including proteins,
lipids, and DNA. Synthetic antioxidants, such as butylated
hydroxyanisole, are used as supplements, but their side-effects cause a potential health hazard which cannot be ignored [10]. Nowadays, there
is considerable interest in finding anti-oxidants from natural resources.
Protein hydrolysates come as an alternative to synthetic antioxidants. In
fact, protein hydrolysates derived from many fish species such as goby
[4], cuttlefish [11], sardinella [12] and zebra blenny [13] have demonstrated
antioxidative activities.