BioMed Research International / 2015 / Article / Tab 4 / Research Article
Comparison of Primary Models to Predict Microbial Growth by the Plate Count and Absorbance Methods Table 4 Growth parameters obtained and their 95% confidence limits and coefficients of determination (
), SSE, and RMSE of fit with different growth models for the average OD growth curves of
Escherichia coli CECT 515 at 37°C in pH 5 TSB+YE inoculating 10
2 , 10
4 , and 10
6 CFU mL
−1 shown in Figure
1(c) .
Growth model Initial concentration (CFU mL−1 ) Lag time (h) Growth rate (OD units h−1 ) (OD units) (OD units)SSE RMSE Three-phase linear 102 14.80 (14.60–15.00) 0.103 (0.100–0.105) 0.161 (0.115–0.207) 1.622 0.995 0.0200 0.0250 104 9.70 (9.53–9.86) 0.110 (0.107–0.112) 0.167 (0.111–0.223) 1.656 0.996 0.0150 0.0220 106 4.44 (4.27–4.61) 0.111 (0.108–0.113) 0.176 (0.113–0.239) 1.600 0.996 0.0150 0.0224 Gompertz 102 15.46 (15.29–15.62) 0.117 (0.115–0.119) 0.144 (0.137–0.152) 1.794 (1.780–1.807) 0.999 0.0700 0.0227 104 10.29 (10.13–10.46) 0.125 (0.123–0.128) 0.146 (0.137–0.155) 1.799 (1.785–1.812) 0.999 0.0663 0.0227 106 4.65 (4.42–4.89) 0.125 (0.122–0.127) 0.123 (0.106–0.140) 1.783 (1.761–1.805) 0.999 0.0597 0.0237 Logistic 102 15.51 (15.12–15.90) 0.117 (0.113–0.121) 0.105 (0.088–0.121) 1.784 (1.758–1.810) 0.997 0.2544 0.0433 104 9.95 (9.56–10.33) 0.123 (0.119–0.126) 0.078 (0.057–0.094) 1.834 (1.808–1.860) 0.997 0.1825 0.0376 106 3.67 (3.46–3.89) 0.120 (0.117–0.123) 0.000a 1.875 (1.864–1.887) 0.997 0.1232 0.0339 Richards 102 15.46 (15.18–15.73) 0.00008 (−0.016–0.016) 0.144 (0.137–0.152) 1.794 (1.772–1.816) 0.00024 (−0.049–0.049) 0.999 0.0670 0.0228 104 10.29 (9.98–10.61) 0.0001 (−0.063–0.063) 0.146 (0.135–0.156) 1.799 (1.778–1.819) 0.00041 (−0.185–0.186) 0.999 0.0663 0.0228 106 4.65 (4.41–4.90) 0.0002 (−0.107–0.107) 0.123 (0.086–0.159) 1.783 (1.743–1.824) 0.00062 (−0.316–0.317) 0.999 0.0598 0.0239 Baranyi 102 14.31 (13.87–14.75) 0.101 (0.097–0.105) 0.126 1.742 (1.727–1.756) 0.996 0.0445 104 8.96 (8.50–9.41) 0.107 (0.103–0.111) 0.115 1.777 (1.763–1.789) 0.996 0.0445 106 2.72 (2.07–3.38) 0.104 (0.099–0.109) 0.060 1.791 (1.776–1.806) 0.994 0.0483
Value fixed at bound.