Resveratrol nanosuspensions for dermal application--production, characterization, and physical stability

Area of Science:

• Pharmaceutical Technology
• Materials Science
• Dermal Drug Delivery

Background:

• Resveratrol, a potent antioxidant, has therapeutic potential for skin conditions.
• Developing stable nanosuspensions is crucial for effective dermal delivery of poorly soluble compounds like resveratrol.
• High-pressure homogenization is a viable method for producing nanosuspensions.

Purpose of the Study:

• To produce and characterize resveratrol (5%) nanosuspensions for dermal application.
• To evaluate the stabilizing effects of different agents (Tween 80, Poloxamer 188, Plantacare 2000, Inutec SP1) at varying concentrations (1% and 2%).
• To assess the short-term stability of the prepared nanosuspensions.

Main Methods:

• Nanosuspensions prepared via high-pressure homogenization (1,500 bar, up to 30 cycles).
• Characterization included particle size analysis (photon correlation spectroscopy, laser diffraction), zeta potential, and crystallinity assessment.
• Short-term stability study conducted over 30 days at room temperature.

Main Results:

• Nanocrystal sizes ranged from approximately 150 nm to 200 nm, with no amorphous fraction detected.
• Nanosuspensions with 1% stabilizer concentration exhibited good short-term stability over 30 days.
• Plantacare 2000 and Inutec SP1 at 1% concentration demonstrated the best stabilization, likely due to steric stabilization.

Conclusions:

• Stable resveratrol nanosuspensions suitable for dermal application can be produced using high-pressure homogenization.
• Lower stabilizer concentrations (1%) are effective and potentially advantageous for short-term stability compared to higher concentrations (2%).
• Plantacare 2000 and Inutec SP1 are promising stabilizers for resveratrol nanosuspensions, primarily through steric stabilization mechanisms.