Modelling the Growth Inhibition Kinetics of Pseudomonas sp. strain DrYJ7 on Acrylamide

Abstract

The bacterium Pseudomonas sp. strain DrYJ7 is an efficient acrylamide-degrader and is able to tolerate high concentrations of acrylamide. A primary modelling exercise for the growth of this bacterium on acrylamide yields important specific growth rates which were utilized successfully for secondary modelling exercise which gave Luong as the best model. The statistical analysis and accuracy of the all six kinetic models used indicated that Luong was the best model with small values for RMSE and AICc, uppermost adjusted R2 values, F-test and with Bias Factor and Accuracy Factor nearest to unity (1.0). The Luong’s constants; maximal growth rate, half-saturation constant for maximal growth, maximal concentration of substrate tolerated and curve parameter that defines the steepness of the growth rate decline from the maximum rate symbolized by max, Ks, Sm, and n (± standard error) were 0.66 per day (95% C.I., 0.51 to 0.82), 18.29 mg/L (95% C.I., -17.51 to 54.10), 5198 mg/L (95% C.I., 4642 to 5755) and 1.37 (95% C.I., 0.54 to 2.21), respectively. The Luong model predicted the limit, upon which bioremediation of acrylamide will cease.