The water activity (aw) of the untreated sample showed a significant decrease when compared to samples at different pressures in the whole range of pressure (P < 0.05).
Using the Multiple Range Test (MRT) included in the statistical program, two homogenous groups were observed (0.1 and 100, 200, 300, 400 and 500 MPa).
Cruz-Romero, Kelly, and Kerry (2007) observed changes in oyster’s water activity treated with high pressures; however, the parameter did not show statistical differences.
Moreno et al. (2011) working with ohmic heating and vacuum impregnation of osmotic dehydrated strawberry reported that aw decreases in treated samples
compared to control samples.
In the same table, values of pH showed significant differences (P < 0.05) between the control and the pressurized samples in the range of 3.27 0.05e3.48 0.02.
Three homogenous groups were observed (0.1e100e300; 200e300e500
and 200e400e500 MPa).
Regarding to acidity, significant differenceswere observed between treated and control samples (P< 0.05) in the range of 0.91 0.01e1.40 0.07%.
Four homogenous groups were observed (0.1; 100 MPa; 200e400 MPa; 300e500 MPa).
Landl et al. (2010) reported similar results working with high hydrostatic pressure on the quality of acidified granny smith apple pureé product.