The results show that the average extraction yield increased as the extraction temperature increased as expected. Higher extraction temperatures lead to higher extraction efficiencies because the mass transfer rate and the solubilization of components within the matrix increase. However, the effects of the temperature on the extraction of the target compounds and other components in the raw material might be different. If the extraction yield of the other components increases more than that of the target compounds, the content of the target compounds in the extract is reduced. This effect can be clearly observed in Fig. 2. As the temperature increased, the curcuminoid content in the extract decreased, although the total amount of curcuminoids increased because the extract yield increased at a higher rate than the amount of curcuminoids extracted. Consequently, the selectivity of the extraction suffered, and the curcuminoid content in the extract was lower.