2.4. Extraction process of capsaicinoids and red pigments from
DRPs
The dried red peppers (DRPs) were obtained by desiccating FRPs
(whole pods) under solar light (the temperature about 20e28 C,
8 h 10 days) or under 50 C (for 8 h 3 days) in an electrothermal
drying oven to constant weight. Then the pericarp were collected
and crushed to a homogeneous size in a mill, sieved through a
No.40 mesh.
The simulative industrial extraction process of red pigmentswas
carried out mainly according to the references (Bae, Jayaprakasha,
Jifon, & Patil, 2012; Sang, Jiang, & Yu, 2008). 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.