Comprehensive Evaluation of Solubility Enhancement Techniques for Curcumin: A Comparative Study of 10 Methods

Background/Objectives: Curcumin is a polyphenolic compound that has been investigated for its therapeutic purposes, particularly for its anti-inflammatory and anti-oxidative activities. Its clinical use, however, has been hampered by its low bioavailability and poor solubility in water. The present study to examin and contrasting ten different methods adopted for the enhancement of solubility of curcumin, which are solid dispersions, micromization, cyclodextrin inclusion complexes, surfactants and nanoformulations. The purpose is to find the best approaches for increasing the solubility and bioavailability of Curcumin. Methods: A series of processes for formulating Curcumin was carried out, solid dispersion (evaporation and melting) methods, micronization, cyclodextrin inclusion complex preparation, surfactant systems (Sodium Lauryl Sulfate, Pluronic F-127), lipid nanoparticles, pH control, co solvent systems, and hydrophilic matrices. Curcumin dissolution studies were conducted with the aid of a USP Dissolution Apparatus II and the dissolved amount was quantified using a UV spectrophotometer. Results: The experiments yielded substantial improvement in the dissolution rate of Curcumin across all methods considered. Cyclodextrin-complexation and nanoformulations were observed to have the greatest dissolution percentages where over 90% was dissolved within 90 minutes. Strong enhancement relative to the control was also demonstrated in the PVP - based solid dispersions prepared by the solvent evaporation method with 94% dissolution. Micronization and surfactant preparations showed moderate improvement in dissolution efficiency ranging from 75 to 88 %. Conclusions: Nanoformulations, Cyclodextrin-complexation, and solid dispersions of PVP enhanced the solubility of Curcumin to the highest extent possible. It can be concluded from these findings that such techniques may be used to enhance the bioavailability of implantable systems based on poorly soluble drugs such as Curcumin displacing the current pharmacological formulation design spine.