Heptapeptide-loaded solid lipid nanoparticles for cosmetic anti-aging applications

Area of Science:

• Cosmetic Science
• Nanotechnology
• Dermatology

Background:

• The cosmetic industry increasingly uses expensive active ingredients like peptides.
• Effective delivery of these actives into the skin remains a challenge.
• Nanoparticle formulations offer a promising solution for enhanced delivery and stability.

Purpose of the Study:

• To develop a cost-effective nanostructured lipid carrier (NLC) or solid lipid nanoparticle (SLN) formulation for improved peptide delivery into the skin.
• To evaluate the protective effects of the SLN-peptide formulation against UV-induced skin damage.

Main Methods:

• Development of SLN encapsulating heptapeptide DEETGEF using hot high-pressure homogenization.
• Characterization of SLN particle size, peptide incorporation, entrapment efficiency, and stability.
• Ex vivo studies on skin explants to assess gene expression (NQO1, HMOX1, PRDX1) and protection against UV stress.
• In vivo clinical suction blister study to measure DNA damage (8-OhdG) after UVA irradiation.

Main Results:

• SLN-P7 formulation exhibited a particle size of 173nm with 90.8% peptide entrapment efficiency.
• Ex vivo studies showed stimulation of protective genes and dose-dependent protection against UV irradiation.
• Clinical studies revealed a statistically significant 20% decrease in UV-induced DNA damage in skin treated with the SLN-peptide formulation compared to placebo.

Conclusions:

• Solid lipid nanoparticle (SLN) technology is effective for delivering peptides into the skin.
• The developed SLN-peptide formulation provides significant protection against UV-induced skin damage.
• SLN technology offers a viable and cost-effective approach for enhancing the efficacy of cosmetic actives.