Previous studies showed that washed muscle fibers and minced pork treated with
HHP in a range of 300e800 MPa for 20 min showed a linear relationship
between pressure and TBA number. A similar phenomenon was reported who confirmed that
300 MPa treatments resulted in higher TBARS values compared
with 200 MPa treatments. found that in dry-cured ham and loins, the TBA
values significantly increased, even at lower pressure (200 and
300 MPa), regardless of the time of treatment. Proteins, peptides or
amino acids in the squid tissues possess significant antioxidant
activity , which may be related to their hydrophobic
nature and orientation of potential antioxidant side chains
at the lipid interface; however, they can also bind prooxidant
metals to phosphoseryl residues . As shown in
Table 3, HHP treatments resulted in more or less release of iron
ions, which could promote free radical formation via Fenton's
mechanism, which supported the results of a previous study
also found that, at the same time, pressure contributes to the
denaturation of myoglobin species, causing greater exposure of the
catalytical heme group.