Lipid-Based Nanocarriers
Lipid‑based nanocarriers are one of the most widely used delivery systems in modern formulation science. This article explains the two major types—Solid Lipid Nanoparticles (SLNs) and Nanostructured Lipid Carriers (NLCs)—in simple, practical terms, focusing on structure, mechanism, advantages, and limitations.
a) Solid Lipid Nanoparticles (SLNs)
What they are
- Nanoparticles made of solid lipids at body temperature
How they work
- Drug dispersed in a solid lipid matrix
- Release via lipid erosion or diffusion
Pros
- Good physical stability
- Controlled release
Cons
- Low drug-loading capacity
- Drug expulsion during storage
b) Nanostructured Lipid Carriers (NLCs)
What they are
- Mixture of solid + liquid lipids
- Imperfection in the crystal structure
How they work
- Higher drug loading than SLNs
- Slower, more controlled release
Pros
- Improved stability
- Better drug incorporation
Cons
- More complex formulation
Delivery Systems in Simple Terms — Series Index
This article is Part 2 of a three‑part series “Delivery Systems in Simple Terms.”
- Part 1 — Nanoemulsions, Liposomes, and Nanoparticles
- Part 2 — Lipid‑Based Nanocarriers (SLNs and NLCs) (current article)
- Part 3 — Controlled Release, Sublingual, and Buccal Delivery
For a simple overview of absorption barriers and bioavailability fundamentals, see our previous article: Bioavailability Explained
For a broader overview of the field, see the Wikipedia article on Drug delivery.
