Lipid-Based Nanoparticles

Abstract

Lipid nanoparticles (LNPs) have gained significant attention in developing vac­cines due to their unique properties, including biocompatibility, biodegradabil­ity, and the ability to encapsulate hydrophobic and hydrophilic molecules. They have been used to enhance the efficacy of vaccines by improving antigen deliv­ery and presentation and facilitating targeted delivery to specific cells and tissues. Additionally, LNPs have been shown to have adjuvant effects, which can further enhance immune responses. These properties make LNPs promising tools for developing safe and effective vaccines against infectious diseases and cancers. The chapter overviews LNPs, including their types, synthesis methods, characteristics, and vaccine applications. The two main types of LNPs discussed are solid lipid nanoparticles and nanostructured lipid carriers. Various synthesis methods are also presented, including high-pressure homogenization, solvent emulsification– evaporation, and microfluidics. The characteristics of LNPs, including size and shape, surface charge, encapsulation efficiency, and stability, are also discussed. The chapter then delves into the applications of LNPs in vaccines, including enhancing immune responses, targeted delivery, and adjuvant effects. Finally, the challenges and future directions of LNPs are explored, including safety and tox­icity concerns, stability issues, scale-up production challenges, and opportunities for future research.