The solid lipid nanoparticles (SLN) are sub-micron colloidal carriers ranging from 50 to 1000 nm, made up of physiological lipid dispersed in water or aqueous surfactant solution. Solid lipid nanoparticle is very important, excellent, novel drug delivery. In 1990 Scientist introduced solid lipid nanoparticles. The first patents have been granted in 1993 for method of producing solid lipid nanoaprticles.this paper review on various patents on solid lipid nanoparticles which show current research scale related to solid lipid nanoparticles.
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