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Table 4 Analysis of variance (ANOVA) for the pectinase activity model using BB design for the tested medium components

From: Bioprocess optimization for pectinase production using Aspergillus niger in a submerged cultivation system

Source DF Sequential SS Adjusted SS Adjusted MS F value p value
Main effects 4 9095.90 9095.91 2273.98 45.01 0.00
Pectin 1 2305.20 2305.18 2305.18 45.62 0.00
(NH4)2SO4 1 2877.70 2877.72 2877.72 56.96 0.00
K2HPO4 1 3835.80 3835.82 3835.82 75.92 0.00
MgSO4.5H2O 1 77.2000 77.1800 77.18 1.530 0.23
Residual error 31 1566.30 1566.27 50.52   
Lack of fit 6 155.200 155.210 25.87 0.460 0.83
Pure error 25 1411.10 1411.06 56.44   
Corrected total 35 10,662.2     
  1. DF Degree of freedom, SS Sum of squares, MS Mean sum of squares