Statistical modelling of a facile process for the extraction of crude constituents of curcuma longa

A preliminary study on a process for the extractions of crude constituents of curcuma longa using statistical modelling is reported. the effects of three independent variables namely; solvent system (ethanol 1: 0/water 0: 1),temperature °c (30-70) and contact time (min) (5-30) were studied using the central composite rotatable design on the extraction of the crude constituents of the rhizome. three characteristics of crude extracts,namely; total phenolic content,colourimetric index and relative total soluble solids as responses were studied. equations for predicting the responses were developed and adequacy confirmed using analysis of variance and residual assessment. the empirical model could find usefulness as a base data for extraction of the crude constituent of c. longa.