Abstract
Objective: Nanostructured lipid carrier is an emerging lipid-derived delivery system that is rapidly gaining popularity due to the simplicity of the manufacturing technique. The primary task in formulating nanoparticles is to optimize the parameters that are involved in the process. The rationale behind this study is to optimize the process parameters for the preparation of nanostructured lipid carriers. 
 Methods: The optimization of selected techniques hot homogenization with ultra-sonication and melt dispersion technique, was carried out via statistical analysis software JMP version 13 Pro using custom design approaches. Sonication time, homogenization speed, stirring rate, and cooling temperature were selected as factors for hot homogenization. Stirring speed, stirring time, and dilution volume were the factors deliberated for melt dispersion. The impact of these factors on the responses, particle size, and polydispersity index were studied. The nanoparticles were prepared according to the ten experimental runs generated by the design. Based on the responses, the design space and optimum framework were selected. 
 Results: The prediction profiler indicated maximum desirability at 81% and 80% for hot homogenization and melt dispersion respectively. The actual versus predicted plot of particle size indicated a regression coefficient (R2) of 0.98, and a p-value of 0.0001 for hot homogenization and for melt dispersion the corresponding values were 0.95 and 0.0003. For the response polydispersity index, these values were 0.92 and 0.0052 for hot homogenization and 0.90 and 0.0024 for melt dispersion.
 Conclusion: The endorsing results indicated the authenticity of the model in predicting the significant processing parameters for NLC.
Highlights
Nanostructured lipid carriers (NLCs) are lipid form of nanoparticles which are popular because of its imperfect matrix core of solid lipid and liquid lipid which shield the drug from degradation improving its stability [1, 2]
Hot homogenization technique with ultrasonication and melt dispersion technique were successfully utilized for the preparation of nanostructured lipid carriers
Optimized parameters generated by the design were employed to prepare glibenclamide NLC
Summary
Nanostructured lipid carriers (NLCs) are lipid form of nanoparticles which are popular because of its imperfect matrix core of solid lipid and liquid lipid which shield the drug from degradation improving its stability [1, 2]. The lipids used are of generally recognized as safe (GRAS) category which makes it suitable for various routes of administration [3, 4]. Optimization of the parameters involved in the process can yield nanoparticles with desired quality attributes [7]. In the present investigation, the selection of optimum processing parameters for the preparation of NLC was the focal point. The two techniques namely hot homogenization technique with ultrasonication (HHU) and melt dispersion technique (MDT) were adopted for preparing NLCs
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