The different parameters were also analyzed statistically and
the results were summarized in Table 2. Under the experimental
conditions, the concentration of ethanol aqueous was a crucial
parameter (P < 0.01) for the extraction of red pigments, meanwhile
the extraction temperature of water bath and the ratio of
solvent to material were also important parameter (P < 0.05) for
the high yield of red pigments. In the range of 90e150 min of
extracting time, the effect on extraction yield of red pigment was
small.