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Table 2 ANOVA of the different responses assessed for the Plackett-Burman design

From: Application of response surface methodology to improve the production of antimicrobial biosurfactants by Lactobacillus paracasei subsp. tolerans N2 using sugar cane molasses as substrate

Factors Inhibition diameter Surface tension Yield
DF Sum of squares F-value p-value DF Sum of squares F-value p-value DF Sum of squares F-value p-value
X 1 1 603.501 30.050 0.031* 1 55.900 21.580 0.043* 1 1.387 27.630 0.034*
X 2 1 61.200 3.050 0.223 1 17.040 6.580 0.124 1 0.158 3.160 0.217
X 3 1 0.300 0.010 0.913 1 0.520 0.200 0.697 1 0.001 0.020 0.891
X 4 1 281.301 14.010 0.064 1 22.687 8.760 0.097 1 0.790 15.750 0.058
X 5 1 643.868 32.060 0.029* 1 222.741 86.000 0.011* 1 1.346 26.820 0.035*
X 6 1 397.901 19.810 0.046* 1 204.188 78.840 0.012* 1 1.009 20.100 0.046*
X 7 1 48.400 2.410 0.260 1 8.500 3.280 0.211 1 0.080 1.590 0.334
X 8 1 96.900 4.820 0.159 1 3.307 1.280 0.375 1 0.235 4.680 0.163
Lack of fit 4 52.829 0.660 0.677 4 43.422 4.190 0.201 4 0.133 0.660 0.675
Pure error 2 40.166    2 5.180    2 0.100   
Total (corr.) 14 2226.37    14 583.489    14 5.242   
R 2    95.82     91.67     95.34  
Adjusted R2    90.25     80.56     89.60  
  1. X1: Temperature; X2: time; X3: agitation speed; X4: inoculum concentration; X5: sugar cane molasses concentration; X6: peptone concentration; X7: yeast extract concentration; X8: K2HPO4 concentration; DF: degrees of freedom; *significant at p < 0.05