Table 4.

Comparison of the experimental and predicted values of the response variables of the QCS nanoparticles prepared under the optimum conditions.

Response Variables	Experimental Values	Predicted Values	Error (%) a
Particle size (nm)	193.68 ± 44.92	199.69	−3.01
PDI	0.232	0.218	+6.42
Zeta potential (mV)	23.97	25.81	−7.13
Encapsulation efficiency (%)	46.37 ± 2.89	41.6	+11.47

^a Error (%) = $\left[\left(\mathrm{experimental}\mathrm{value}-\mathrm{predicted}\mathrm{value}\right)/\mathrm{predicted}\mathrm{value}\right]\times 100\%$.