In vitro scleral lutein distribution by cyclodextrin containing nanoemulsions.

Area of Science:

• Ocular Drug Delivery
• Nanotechnology in Ophthalmology
• Macular Pigment Research

Background:

• Lutein is a vital macular pigment for maintaining eye health.
• Current ocular delivery methods face challenges due to the scleral structure.
• Nanocarriers offer potential for improved user-friendliness and cost-effectiveness in ocular delivery.

Purpose of the Study:

• To develop hybrid nanocarriers integrating nanoemulsion and cyclodextrin (CD) for enhanced scleral lutein accumulation.
• To investigate the efficacy of CD-modified nanoemulsions in improving lutein's ocular delivery and stability.

Main Methods:

• Development of hybrid nanocarriers combining nanoemulsion and cyclodextrin (βCD, HEβCD).
• Evaluation of lutein partition into porcine sclera using nanoemulsion-CD formulations.
• Assessment of drug-loading efficiency, cytotoxicity in retinal cells, and stability in aqueous systems.

Main Results:

• Hybrid nanocarriers significantly increased lutein accumulation in porcine sclera, with a 9.2-fold enhancement using 2% hydroxyethyl βCD (HEβCD) and nanoemulsion.
• Scleral lutein accumulation increased proportionally with higher cyclodextrin content in the nanoemulsion.
• The novel nanoemulsion exhibited 95% drug-loading efficiency and low cytotoxicity, improving lutein stability and entrapment.

Conclusions:

• CD-modified nanoemulsions are effective in enhancing lutein accumulation within the sclera.
• This hybrid nanocarrier system improves lutein's stability and ocular delivery efficiency.
• The developed system shows promise for user-friendly and cost-effective ocular lutein delivery for eye health.