2.6.2. Determination of pH and titratable acidity of H. erinaceus
wine and vinegar
Samples were centrifuged (5 min at 350 g) and the pH was
measured at 20 C using a pH meter (Model 430, Corning, NY, USA).
Titratable acidity as citric acidwas determined by titration to pH 8.3
with 0.1 N NaOH (AOAC, 1990).