Low-Cost Biodegradation and Detoxification of Textile Azo Dye C.I. Reactive Blue 172 by Providencia rettgeri Strain HSL1

Table 2

Enzyme activities during decolorization of dye RB 172 by P. rettgeri strain HSL1.

Enzymes	Control cells (0 h)	After decolorization (20 h)
Laccase^1	0.285 ± 0.04	0.456 ± 0.05
Azo reductase^2	0.162 ± 0.02	0.420 ± 0.03
NADH-DCIP reductase^3	17 ± 2.05	32 ± 2.12

Values are mean of three experiments ± standard error of mean (SEM), significantly different from control cells at by one-way analysis of variance (ANOVA) with Tukey-Kramer comparison test.
¹M of ABTS oxidized min⁻¹ mL of enzyme⁻¹ mg of protein⁻¹.
²M of methyl red reduced min⁻¹ mL of enzyme⁻¹ mg of protein⁻¹.
³M of DCIP reduced min⁻¹ mL of enzyme⁻¹ mg of protein⁻¹.