Efficient MAE, UAE and SC CO2E methods for curcumin from
C. longa has been developed. Compared among each other, high
extraction recovery at minimum extraction time was obtained with
MAE. Water soaking effectively contributed in curcumin extraction.
Extraction rate constant of curcumin has been calculated based on
the experimental results. The value of curcumin extraction rate
constant k increased with use of water as soaking solvent and acetone as extraction solvent.