After removal of capsaicinoids from FRPs, the pepper residues
were collected and used as materials for investigating the conditions
of extraction of red colorants by single-factors. The residues of
8.1 g (equivalent to 10 g of fresh sarcocarp of red peppers) were
used in every experiment. The extracted solutionwas collected and
diluted to a same volume with 95% ethanol to determine its
absorbance. So, the content of carotenoids was calculated from the
values of absorbance and used to compare the extraction yield of
each experiment. The results were shown in Fig. 4(B) and revealed
that the effects of the concentration of ethanol and the extractive
temperature were very important on the extraction yield of red
pigments.