contents varied from 3.44 to 58.83 mg quercetin/g
weight. Chloroform extract has been found to be rich in flavonoids.
The variation may be due to environmental conditions
and geographical distribution, which can modify the constituents
of the plant.
The antioxidant capacity of the five extracts and essential
oil was measured spectrophotometrically through phosphomolybdenum
method, which is based on the reduction of Mo (IV)
to Mo (V) by the sample analyte and the subsequent formation
of green phosphate/Mo (V) compounds with a maximum
absorption at 695 nm. The antioxidant capacity of the extracts
and essential oil of M. borneensis was found to decrease in the
order, aqueous ethanol extract> chloroform >essential
oil> hexane >butanol >ethyl acetate extract (Table 3).