In order to intensify the extraction of crude constituents of Curcuma longa, three independent variables namely lactic acid (0.01-1)%, time (10-60) min and solid/solvent ratio (0.01-0.1) were concurrently studied using the central composite rotatable design on some crude extract characteristics namely; crude extract soluate, total phenolic content, pH and colour density as responses. Statistical modelling of the independent variables on the responses was attempted. The intensification process was characterised by high enhanced extraction of crude constituents (µg/mL) 67.00-440.00 and 28.85-133.17 in comparison to the low amount8.65-62.50 and 1.70-23.48 of crude constituent extract of the control sample measured at 420 and 520 respectively. Statistical modelling of the process was accomplished and equations for predicting the responses were developed and adequacy confirmed using analysis of variance and residual assessment. The intensified process could serve as economic driven route for the extraction of crude constituents of C. longa which could serve as a feed stock for preparation of value added curcuminoid based products with special dietary colourant and bioactive characteristics.
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