Determination of total phenolics and hyxroxycinammic
acid derivatives. Briefly, 1 ml of each
extract was mixed with 1 ml 0.1% HCl-ethanol solution
and 8 ml 2% HCl-ethanol solution in a 10 ml
volumetric flask. The absorbance was measured at
280 and 320 nm in order to evaluate total phenolic
content and hydroxycinammic acid derivatives, respectively.
The corresponding standard curves to the
above determinations were prepared using ethanolic
solutions of gallic acid and caffeic acid and the results
were expressed as mg GAE/100 g d.s. and mg caffeic
acid equivalents (CAE)/100 g d.s