Parameter estimation of tapioca starch hydrolysis process: application of least squares and genetic algorithm

• Main Authors: Rashid, Roslina, Jamaluddin, Hishamuddin, Saidina Amin, Nor Aishah
• Format: Article
• Language: English
• Published: The Institution of Engineers, Malaysia 2005
• Subjects: T Technology (General)
• Online Access: http://eprints.utm.my/id/eprint/5585/3/RoslinaRashid2005_ParameterEstimationofTapiocaStarch.pdf; http://eprints.utm.my/id/eprint/5585/; http://www.myiem.org.my/content/journal-122.aspx

The performance of genetic algorithm (GA) in nonlinear kinetic parameter estimation of topiaca starch hydrolysis was studied and compared with Gauss-Newton method. Both methods were employed for determining the model parameters of the modified version of Gonzalez-Tello model. To estimate and validate the model parameters, experimental works involving hydrolysing tapioca starch were conducted. The model was then used to predict glucose concentration profile for a given initial condition of the tapioca hydrolysis process. In terms of error index values, both methods produced good results. This study showed that the impact of user defined parameters of the GA was insignificant as compared with the influence of the initial parameters of Gauss-Newton method on the predictive performance. Futhermore, the GA approach requires no guessing of the initial values and is able to produce reasonable solutions for the estimated parameters.