t
were homogenized in 2 mL of 80% ethanol containing 2% pyrogallol. Hexane (2 mL) containing BHT (100
mg/L) was added to the mixture, followed by vortex mixing for 1 min, until the carotenoids upper hexane layer
was visibly yellow. Each sample was centrifuged at 2000 rpm for 5 min. The upper hexane layer and lower
ethanol layer were separated to each different glass tube. The extraction was repeated five times until the last
fraction of hexane was devoid of color. To confirm the complete extraction, carotenoids and tocopherols
contents of the lower ethanol layer were analyzed and were not detected. The sample evaporation to dryness was
carried out using evaporator (EYELA, Tokyo Rikakikai Co., Japan) under 40˚C. Then the lipophilic extract of
pulp and seed aril were dissolved in methanol and used for analysis antioxidant property. The lipophilic extracts
were reconstituted with 2 mL of methanol:acetonitril:tetrahydrofuran (50:45:5, v/v/v) and this mixture of
solvents was used as a mobile phase in an isocratic high-performance liquid chromatography (HPLC) system to
separate the carotenoids. The reconstituted samples were placed in autosampler vials, and then analyzed by
HPLC.