EPPs were extracted from samples using aqueous–organic
solvents. The extraction procedure is described
elsewhere (Jime´nez-Escrig, Jime´nez-Jime´nez, Pulido, &
Saura-Calixto, 2001). The supernatants were combined
and total extractable phenols were estimated by the
Folin–Ciocalteau method (Jime´nez-Escrig et al., 2001)
using gallic acid as a standard; results were expressed as
gallic acid equivalent (GAE).