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

Table 4

Stability of the Streptomyces  flavogriseus HS1 extracellular proteases in the presence of various surfactants and oxidizing agents.

Detergents	Concentrations (%)	Remaining activity (%)
Triton X-100	1%	61.4
	5%	40.5
Tween 80	1%	71.4
	5%	40.5
Tween 20	1%	70.2
	5%	37.8
SDS	0.1%	18.9
	0.5%	0
Sodium perborate	0.1%	64.1
	1%	39.8
H2O2	0.1%	61.4
	0.5%	58.7

The crude extracellular proteases were incubated with different surfactants and oxidizing agents for 1 h at 25°C and the remaining activity was measured under standard conditions. The activity is expressed as a percentage of the activity level in the absence of additives.