The effect of HPP on the microstructure of cold smoked salmon was minimal at 400 MPa, but increased with both time and pressure and is most significant at 900 MPa and 60 s. When Fig. 5 is compared to results in Table 1, where the greatest reduction of L.innocua occurs, it is clear that the effect on microstructure coincide with the reduction of the bacteria. The effect at 500 MPawas not as obvious. It is known that HPP affects microstructure of meat and fish at pressure between 200 and 400 MPa, depending on the type have also reported the effect of HPP at 300 MPa on gaping in salmon fillets.
Their results indicated more gaping in salmon fillets, caused by shrinkage of the myofibrils and increased space between the
myofibrils.