3.2. pH
Changes in pH of hake are shown in Fig. 2a. Hake (H) used inthe experiment had an initial pH of 7.02. This pH remains constant until day 7, reaching pH > 7.7 at 15 days (p 0.05).
Similar behaviour was observed in HF and HFP lots (although the pH progression in HFP lot was slower that in HF lot).
On the contrary, the hake covered with green tea film, with or without probiotic bacteria (HFT, HFTP), maintained the initial levels of pH w7 at the end of storage period. This result can be a consequence of the bacterial counts observed in these samples (lower 5e6 log CFU/g)
since the bacterial activity was reduced, and therefore could
produce minor quantities of some volatile base compounds, which can provoke an increment of pH