Table 3.

Effect of metal ions (5 mM concentration) on phytase activity (% relative activity as compared to control) of selected PSB isolates

S. no.	Modulator/metal ion	% relative activity
		PSB-15 Phytase	PSB-45 Phytase
1	Control	100	100
2	Ferrous sulphate	49.9	35.8
3	Copper sulphate	78.7	26.2
4	Manganese sulphate	72.6	36.6
5	Magnesium sulphate	38.9	46.2
6	Mercaptoethanol	33.3	74.6
7	Urea	41.9	17.9
8	Ascorbic acid	52.8	37.3
9	DTT	67.6	54.3
10	EDTA	35.4	70.8