2.3.5. Preparation of oxidized EKWE and ECBE
The oxidation of phenolic compounds in EKWE and ECBE was
carried out as per the method ofStrauss and Gibson (2004)
with a slight modification. The extracts (0.05 g) were dissolved in 5 ml of ethanol and 90 ml of distilled water. The
solutions were adjusted to pH 7, 8 and 9 using 6 M NaOH or
6 M HCl. The prepared solutions were placed in a