Acid treatments (0.5% or 1%, treatments b and c, respectively) were prepared by dissolving citric or ascorbic acid powder (Sigma- Aldrich, Madrid) at individual concentrations of 0.5 or 1.0%, the pH of the solutions being 2.2 and 2.6, respectively
Acid treatments (0.5% or 1%, treatments b and c, respectively)were prepared by dissolving citric or ascorbic acid powder (Sigma-Aldrich, Madrid) at individual concentrations of 0.5 or 1.0%, the pHof the solutions being 2.2 and 2.6, respectively