Figure 3: Experimental outcome of Taguchi designed experiments: (a) mean effect plot and (b) mean effect plot for signal-noise (SN) ratio. Signal-to-noise: nominal is best (10*Log10(Ybar**2/s**2)). Optimum formulation conditions: BSA concentration 4% w/w; volume of BSA solution to total ethanol ratio 1 : 0.90 v/v; concentration of diluted ethanol 70% v/v. Ethanol dilution was found to be the most influential factor effecting particle size.