Table 3. Effect of inhibitors and metal ions on LacA activity.

Inhibitor	Concentration (mM)	Relative activity (%)	Metal ion	Concentration (mM)	Relative activity (%)
L-Cysteine	0.01	87.5±1.7	Na+	10	115.1±0.9
	0.1	5.5±0.1	K+	10	109.8±1.7
DTT	0.01	38.4±7.1	Li+	10	48.8±0.9
	0.1	5.9±0.7	Cu2+	10	101.9±4.3
EDTA	1	95.4±3.2	Ca2+	10	113.6±2.0
	10	82.4±2.4	Mg2+	10	111.6±3.2
NaN3	0.01	30.2±2.5	Mn2+	10	117.3±2.3
	0.1	9.2±1.5	Zn2+	10	111.0±3.9
SDS	0.01	80.8±0.9	Fe2+	10	3.8±0.8
	0.1	11.4±1.2	Cr2+	10	99.0±1.1
Kojic acid	12.5	49.3±1.8	Co2+	10	99.8±4.1
	50	31.7±3.2	Pb2+	10	93.8±3.7

Values represent mean ± standard deviation (n = 3).