Plant materials (dried skin or flesh part of A. cepa) were dried at
room temperature and powdered. The dried materials (17.38 g)
were extracted with methanol (650 ml) at room temperature, with
a shaker at 150 rpm over 48 h. The extract solutions were filtered
and concentrated, in vacuo, to obtain the crude methanol extracts.
The crude extracts were 1.75 g.