Ethanol and water have similar solubility properties because
they contain hydroxyl group which is hydrophilic. Furthermore,
the ethanol is an organic solvent whereas water
is an inorganic solvent, andrographolide (C20H30O5) which
is a large hydrocarbon molecule can be better dissolved in ethanol although andrographolide has more polar function
Fig. 4 shows the evolution of the percentage of final extracted
concentration. This percentage is determined by dividing
each concentration by the final concentration. This
representation allow us to study the dynamic of the phenomena,
independently of the equilibrium. The curves show that
the percentage of ethanol has no significant influence on the
kinetic of extraction.