Improved yield of α-L-arabinofuranosidase by newly isolated Aspergillus niger ADH-11 and synergistic effect of crude enzyme on saccharification of maize stover

Bioresources and Bioprocessing

Table 7 Regression coefficient for α-L-arabinofuranosidase production

Term	Coefficient	Standard error coefficient	T value	P value
Constant	18.9983	0.9583	19.824	0.000
Urea	0.4454	0.4792	0.930	0.361
MgSO₄	−0.4246	0.4792	−0.886	0.384
CaCl₂	−0.0054	0.4792	−0.011	0.991
pH	−0.5050	0.4792	−1.054	0.302
Ammonium sulfate	0.8204	0.4792	1.712	0.099
Fermentation time	2.5997	0.4792	5.420	0.000
Urea × Urea	0.5010	0.7319	0.684	0.500
MgSO₄ × MgSO₄	2.4422	0.7319	3.337	0.003
CaCl₂ × CaCl₂	−0.2028	0.7319	−0.277	0.784
pH × pH	0.5997	0.7319	0.819	0.420
Ammonium sulfate × Ammonium sulfate	−2.7403	0.7319	−3.744	0.001
Fermentation time × Fermentation time	−0.0628	0.7319	−0.086	0.932
Urea × MgSO₄	0.6138	0.8300	0.739	0.466
Urea × CaCl₂	1.8538	0.8300	2.234	0.034
Urea × pH	0.4800	0.5869	0.818	0.421
Urea × Ammonium sulfate	−0.6538	0.8300	−0.788	0.438
Urea × Fermentation time	−1.2113	0.8300	−1.459	0.156
MgSO₄ × CaCl₂	−1.2425	0.8300	−1.497	0.146
MgSO₄ × pH	0.6838	0.8300	0.824	0.418
MgSO₄ × Ammonium sulfate	0.7537	0.5869	1.284	0.210
MgSO₄ × Fermentation time	−1.2925	0.8300	−1.557	0.131
CaCl₂ × pH	1.6750	0.8300	2.018	0.054
Ammonium sulfate × Fermentation time	1.0675	0.8300	1.286	0.210
CaCl₂ × Ammonium sulfate	−0.2706	0.5869	−0.461	0.649
CaCl₂ × Fermentation time	−0.2487	0.8300	−0.300	0.767
pH × Ammonium sulfate	1.8425	0.8300	2.220	0.035
pH × Fermentation time	0.1500	0.8300	0.181	0.858