Rheological Characterization of Lemon Oil-Loaded Eucerin Cream and Aquaphor Ointment

Area of Science:

• Pharmaceutical Sciences
• Dermatology
• Materials Science

Background:

• Lemon oil exhibits therapeutic properties for skin conditions.
• Incorporating active ingredients into existing ointment bases like Eucerin and Aquaphor is common in pharmaceutical formulation.
• Determining maximum drug-loading capacity is crucial to maintain ointment properties.

Purpose of the Study:

• To determine the maximum lemon oil loading capacity in Eucerin and Aquaphor ointment bases.
• To investigate the impact of varying lemon oil concentrations on the rheological properties of these formulations.

Main Methods:

• Lemon oil was incorporated into Eucerin and Aquaphor at different concentrations.
• Rheological properties were assessed using flow and oscillation modes.
• Creep and recovery tests were conducted to evaluate viscoelastic properties.

Main Results:

• Lemon oil addition influenced viscosity, elastic and viscous moduli, compliance, and strain.
• Despite changes, the overall rheological behavior of both bases remained consistent with controls.
• Rheological testing successfully identified changes in formulation properties due to lemon oil.

Conclusions:

• Rheological testing is an effective method for determining the maximum loading capacity of lemon oil in ointment formulations.
• This approach ensures that topical formulations maintain desired performance characteristics.
• Understanding rheological impacts is key for developing stable and effective lemon oil-based dermatological products.