Production of Proteolytic Enzymes by a Keratin-Degrading Aspergillus niger

Table 1

Characterization of proteolytic and keratinolytic activity using protease inhibitors.

		Residual activity (%)
Inhibitor	Concentration	Proteolytic	Keratinolytic
None	—	100	100
EDTA	5 mM	83	176
PMSF	5 mM	99	58
1,10-phenantroline	1 mM	107	145
Pepstatin	5 μM	18	100
Iodoacetamide	100 μM	89	92