4. Conclusion
This study clearly demonstrated the effect of high pressure on
the STEC survival behaviors in FSP. HPP treatments at 250 MPa and
350 MPa for 5 min at 10 C resulted in greater than 5-log reduction
of E. coli O157:H7 and the “Big Six” non-O157 STEC cocktails,
respectively. In FSP, the pressure resistance of “Big Six” STECs
showed slightly higher than O157:H7 strains. It is recommended
that the pressure should be greater than 350 MPa and the holding
time longer than 5 min to eliminate the STECs in FSP or similar high
acid fruit products (e.g. pH < 4.6). HPP has been applied as an
alternative to conventional food processing technologies in foods,
especially for heat-sensitive and value-added items. More studies
are needed in scale-up and HPP process optimization for industrial