A Highly Thermostable Xylanase from Stenotrophomonas maltophilia: Purification and Partial Characterization

Table 2

Effect of different nitrogen sources on xylanase production by S. maltophilia strain X6.

Nitrogen sources (0.5%)	Xylanase activity (IU/mL)*
Yeast extract	25±0.6
Tryptone	22.8±0.4
Beef extract	20.0±0.6
Peptone	18±0.6
NH4NO3	10.6±0.4
(NH4)2SO4	9.2±0.4
Urea	8.2±0.4
NaNO3	6.8±0.2
KNO3	3.6±0.2

∗Results are mean ± SD of three determinations.