Powdered peels (20 g) were extracted for 24 h with 200 mL absolute methanol and ethanol, separately at
50 rpm at 30 C. The peel residue was filtered, extracted twice with respective solvent and extracts were pooled.
Solvent was nearly evaporated at low pressure and at 45 C, using a rotary evaporator
(N-N Series, Eyela, Rikakikai Co., Ltd., Tokyo, Japan), and yield of dried extracts was calculated.
Extracts were stored at 4 C for
further analysis.