Methanol/water (80:20 v/v, 1 ml) was mixed with coconut oil
(5.0 g), and the phenolic substances were extracted using a vortex
at 40 Hz for 2 min (twice). The mixture was centrifuged (1080 g,
10 min) and the resultant clear solution was separated. This procedure
was repeated four times for the same oil sample with fresh