Dilution with water after the cloud point extraction may hydrate the surfactant and decrease the concentration of surfactant below its critical micelle concentration. Due to this, curcumin may get out of the solution.
Curcuma (turmeric) is an important spice crop of India. The tubers and their powder are used in daily food preparations and as an antibiotic. It is considered as an auspicious spice and its products are widely used in functions and ceremonies. CSIR-CFTRI, Mysore, India has developed techniques for isolating oleoresin, color etc. from turmeric. You may visit the website and contact the Director or the scientists for guidance.