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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