Interaction of tannase from Aspergillus niger with polycations applied to its primary recovery

- Study of the interaction of tannase (TAH) with three polycations.
- Effect of the interaction on the secondary and tertiary structure of TAH.
- TAH recovery from Aspergillus niger culture broth.
- Precipitation with chitosan (CS): 53% yield, 10 times concentration.
- Adsorption onto CS beads: 72% yield, 2.28-fold purification, 5 times concentration.