Streptomyces flavogriseus HS1: Isolation and Characterization of Extracellular Proteases and Their Compatibility with Laundry Detergents

Table 2

Effect of various metal ions (5 mM) on the activity of crude enzyme from Streptomyces  flavogriseus HS1.

Ions (5 mM)	None	Ca^2+	Mg^2+	Fe^2+	Mn^2+	Cu^2+	Ba^2+	Hg^2+	Na^+	K^+
Relative activity (%)	100	100	100	71	100	0	79	0	100	67

The activity of the proteases was determined by incubating the enzyme in the presence of various metal ions for 10 min at 50°C and pH 7.0.