Abstract:
The extraction of cassava starch using polyoxyethelene sorbitan monooleate (Tween 80) as surfactant was investigated. The experiment was conducted in a batch system. The study was divided into two sections. In the first section, the amount of water required for extraction of starch from cassava root and the stirring time were varied to find optimum conditions. Mass fraction of liquid and dry solid (L/S ratio) were varied at 10.5, 12.0, 13.5, 15.0, 16.5, 18.0, and 19.5, respectively. The stirring time were varied between 2 to 14 minutes. In the second section, effect of surfactant on extraction of starch from cassava root was studied. The parameters for extraction of starch were concentration of tween 80 solution (0.25%wt, 1%wt, and 3%wt), stirring time (2 to 14 minutes) and the mass fraction of liquid and dry solid (10.5, 12.0, 13.5, and 15.0). Results showed that extraction efficiency of starch extraction increased with amount of water and stirring time. The optimum conditions for extraction of starch were stirring time of 10 minutes and the mass fraction of liquid and dry solid (L/S ratio) of 15. Under these conditions, the extraction efficiency was found to be 73%. Addition of polyoxyethelene sorbitan monooleate (Tween 80) at concentrations higher than the critical micelle concentration enhanced starch extraction efficiency. The extraction efficiency increased with the increase L/S ratio and concentration of tween 80 solution
