Formulation and evaluation of curcumin gel for topical application

Area of Science:

• Pharmacology
• Materials Science

Background:

• Curcumin possesses anti-inflammatory properties but faces challenges in topical delivery.
• Developing effective topical formulations is crucial for localized treatment.

Purpose of the Study:

• To develop and evaluate topical gel formulations of curcumin for enhanced anti-inflammatory effects.
• To investigate the penetration-enhancing effect of menthol on curcumin delivery through rat epidermis.

Main Methods:

• Carbopol 934P (CRB) and hydroxypropylcellulose (HPC) were used to prepare curcumin gels.
• Menthol (0-12.5% w/w) was incorporated to assess its effect on percutaneous flux.
• Formulations were evaluated for compatibility, drug content, viscosity, in vitro skin permeation, and anti-inflammatory activity.
• Anti-inflammatory effects were assessed using the carrageenan-induced rat paw edema model.

Main Results:

• Differential scanning calorimetry and infrared spectroscopy confirmed drug-polymer compatibility.
• Menthol significantly enhanced the percutaneous flux and enhancement ratio of curcumin across rat epidermis.
• All developed topical gel formulations were found to be non-irritating to the skin.
• Both CRB and HPC gels demonstrated significant anti-inflammatory effects compared to the control group.
• CRB gel exhibited a higher percentage of inflammation inhibition than HPC gel, comparable to diclofenac gel.

Conclusions:

• Topical curcumin gels formulated with CRB and HPC, enhanced by menthol, are effective for anti-inflammatory treatment.
• Menthol acts as an effective penetration enhancer, improving curcumin's topical delivery.
• CRB-based curcumin gel offers superior anti-inflammatory efficacy compared to HPC-based gel.