Table 4 Regression analysis for the production of β-mannanase in the Plackett-Burman design

Model

–

11.95

0.0330

Intercept

365.8631

–

–

(NH₄)₂SO₄

45.3869

17.52

0.0248

Initial moisture content

81.69643

56.78

0.0048

CaCl₂

21.42262

3.90

0.1426

MgCl₂

7.625

0.49

0.5326

KH₂PO₄

36.67262

11.44

0.0430

ZnSO₄

15.6131

2.07

0.2455

MnSO₄

-9.07738

0.70

0.4639

FeSO₄

-17.7917

2.69

0.1993