... gallic acid optimum pH value of 5.5 to 6.0, the optimum temper Product name:TannaseOther names: Tannin acylhydrolaseCAS ... , generally in the presence of 2% tannic acid and 0.2% casein hydrolyzate by Aspergillus niger, Aspergillus oryzae or ... Penicillium Chua's medium to remove the mycelium, extracted with water, acetone precipitation, drying. Tannase/Tannin acylhydrolase-high quality CAS 232-804-4