The detail methods
were as follows. An amount of 0.9 g powders of DRPs (equivalent to
10 g of FRPs) was loaded into a Soxhlet extractor and then was
extracted using hexane 150 mL for 6 h. The extracted solution was
collected and evaporated to dry under reduced pressure with a
rotary evaporator at 35 C. A oleoresin containing red pigments and
pungent substance was obtained.