IMPROVEMENT IN TANNASE RECOVERY USING ENZYMATIC DISRUPTION OF MYCELIUM IN COMBINATION WITH REVERSE MICELLAR ENZYME EXTRACTION

A high activity tannase (tannin acyl hydrolase EC 3.1.1.20) is synthetized in high yield by Aspergillus niger LCF 8. At the production optimum, the tannase is strongly bound to the mycelium and detachment of the enzyme by classical physical and chemical means, largely failed. Enzymatic hydrolysis of cell walls using a chitinase from Streptomyces griseus followed by reverse micellar tannase extraction resulted in a recovery of 43 % active enzyme, i.e. an improvement in yield of 2.5 from a previous process. Best conditions were enzymatic hydrolysis of mycelium with chitinase at pH 6.0 and 25-degrees-C for 2.5 h followed by tannase extraction at pH 7.5 with isooctane containing 80 mM cetyl trimethyl ammonium bromide and stripping at pH 4.0 in the presence of 0.35 M NaCl.