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Table 3 Experimental range and coded levels employed in the response surface methodology (RSM) using the Box–Behnken design for increasing the production of β-glucosidase enzymes by B. subtilis RA10

From: Bioprospecting of novel thermostable β-glucosidase from Bacillus subtilis RA10 and its application in biomass hydrolysis

  Process variable Range and level
− 1 0 + 1
A Paddy straw (%, w/v) 1 2 3
B Beef extract (%, w/v) 0.1 0.25 0.4
C PEG 6000 (%, v/v) 0.1 0.25 0.4
D NaNO3 (%, w/v) 0.1 0.25 0.4