3. Results and discussion
The yields were found to be 5.9% and 5.04% (w/w) for the waterbased
and ethanol-based GJE extracts, respectively, therefore the
extractions performed with water resulted in the higher total yield.
Phenolics are secondary metabolites which are major components
of plants and can scavenge free radicals. The free radical-scavenging
activity is one of the main functions of phenolic phytochemicals
(Dorman, Peltoketo, Hiltunen, & Tikkanen, 2003). As
described above, the total phenolic content of the GJE extracts
was determined from a regression equation of the calibration curve
(y = 0.5181x0.5953) and expressed in gallic acid equivalents
(GAE). These values were 53.5 and 44.8 mg GAE per 100 g of dry
mass for the water and ethanol extracts, respectively (Table 1).