3.3. Antioxidant activity and total phenol, flavonoids and caffeine
The mean concentration of phenols and flavonoids and the caffeine
percentage became progressively greater as both the DE and
FE concentrations increased. The highest values of phenols were
observed at 20 mg mL−1, which presented 23.11 gallic acid equivalents
(GAE) mg/g of extract for DE and 42.96 GAE mg/g of extract
for FE. The total flavonoids of DE were 19.03 equivalents quercetin
(EQQ) mg/g of extract and of FE were 31.24 EQQ mg/g of extract.
The caffeine percentages of DE and FE were 0.36%and 0.53%, respectively.
The highest antioxidant activity observed was at 20 mg mL−1
extract concentration, 65.27% (DE) and 72.45% (FE) (Table 5).