Table 7 shows the p-values between CE, contact angle measurements
and amount of residual proteins obtained from multiple
variable analysis. If p-values were lower than 0.05, it was considered
that variables were statistically significant at the 95.0% confi-
dence level. As it can be observed in Table 7, there were no
statistically significant relation (p-values higher than 0.05)
between CE’s values and the amount of residual proteins for any
case studied, confirming that in spite of the high CE, BSA molecules
remained in the membranes. By contrast, relation between CE’s
values and contact angle were statistically significant (p-values
lower than 0.05) for all cases except for UP005 cleaned with
NaOH, what can be explained by the surface modification due to
NaOH as explained in Section 3.3.1.