Evolution of pH, aw and weight is presented in Table 3. Final pHwas
not affected by HHP treatment regardless of the condition of the raw
material. Initial pH ranged between 5.5–6 for salami and 5.2–5.8 for morr.
During fermentation the pH decreased to around 4.6 for the salami
samples. For the morr samples, the pH increased substantially and averaged
at 5.5 at the end of fermentation period, independently of conditions
used. In another study, where HHP was not used, the pH range
for morr and salami was 4.39–5.19 and 4.41–5.08 respectively, and
the pH evolution was mainly explained by the level of added glucose
with lower average values in sausages with high batter glucose (Heir
et al., 2010). A study (Omer et al., 2010) found that there was no
difference between the means of the final pH of morr with 4.94 and
that of salami with 4.77. But higher ultimate pH was also registered in morr in another study (Heir et al., 2010). Heart muscle is in the recipe
and might influence buffer capacity, but cannot be the explanation as
the pH dropped initially