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Table 2 Central composite design by screening the effective factors through the Plackett–Burman design

From: Significant increase in cyanide degradation by Bacillus sp. M01 PTCC 1908 with response surface methodology optimization

Coded values Factors Range examined Levels
− α − 1 0 + 1 + α
A Temperature (°C) 25–48 25.2 30 37 44 48.7
B Rotation speed (rpm) 95–264 96 130 180 230 264
C Inoculation amount % 1.59–18.4 1.6 5 10 15 18.4