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Table 1 Matrix of Plackett & Burman experimental design

From: Immobilization of commercial inulinase on alginate–chitosan beads

Independent variables

Coded levels of variables

-1

0

+1

Chitosan (%)

0.1

0.25

0.4

Glutaraldehyde (%)

0.1

0.50

0.9

Sodium alginate (%)

1

3

5

CaCl2 (%)

1

2

3