Abstract
The study aimed to determine the optimum conditions of the sonication in the manufacture of nanostructured lipid carriers (NLC). Nanostructured lipid carriers were developed using a mixture of palm stearin and palm olein, water, and tween as surfactants. Optimization was carried out to obtain nanostructured lipid carriers with a size below 200nm, zeta potential + 30 mV, and polydispersity index below 0.5.
 Optimization of NLC using response surface methodology and Box-Behnken experimental design. The independent variables were amplitude (A, kHz), pulse on pulse off (B, minute), and time of sonication (C, minute) each at three levels, while dependent variables were zeta potential (Y1, mV), particle size (Y2, nm), and polydispersity index (Y3). Measurement for dependent variables using the Zetasizer Nano ZS particle size analyzer utilized with Malvern software (Malvern, UK).
 The optimum formulation was obtained at a combination of amplitude (35 kHz), pulse on pulse off (pulse on 9 pulses off 3), and time of sonication (3 minutes 25 seconds ). This resulted in NLC having particle size 127.9 nm, polydispersity index 0.191, the zeta potential of -27.3 mV.
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