Abstract
Background: Solid lipid nanoparticles offer a range of advantages as delivery
systems but they are limited by effective manufacturing processes.
Objective: In this study, we outline a high-throughput and scalable manufacturing process
for solid lipid nanoparticles.
Methods: The solid lipid nanoparticles were formulated from a combination of tristearin
and 1,2-Distearoyl-phosphatidylethanolamine-methyl-polyethyleneglycol conjugate-2000
and manufactured using the M-110P Microfluidizer processor (Microfluidics Inc, Westwood,
Massachusetts, US).
Results: The manufacturing process was optimized in terms of the number of process cycles
(1 to 5) and operating pressure (20,000 to 30,000 psi). The solid lipid nanoparticles
were purified using tangential flow filtration and they were characterized in terms of their
size, PDI, Z-potential and protein loading. At-line particle size monitoring was also incorporated
within the process. Our results demonstrate that solid lipid nanoparticles can be effectively
manufactured using this process at pressures of 20,000 psi with as little as 2 process
passes, with purification and removal of non-entrapped protein achieved after 12 diafiltration
cycles. Furthermore, the size could be effectively monitored at-line to allow rapid
process control monitoring and product validation.
Conclusion: Using this method, protein-loaded solid lipid nanoparticles containing a low
(1%) and high (16%) Pegylation were manufactured, purified and monitored for particle
size using an at-line system demonstrating a scalable process for the manufacture of these
nanoparticles.
Keywords:
High-throughput manufacturing, microfluidizer processor, protein delivery, solid lipid nanoparticles,
microfluidics, tangential flow filtration.
Graphical Abstract
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