3.2. Total phenolic content
The TPC values of the successive orange peel extracts
ranged from 105 to 3 mg GA/g dry extract (see Table 1).
The phenolic content of the seven samples decreased in
the following order: ethyl acetate fraction > butanolic
fraction > ether fraction > dichloromethane extract >
water fraction > residue 2 > residue 1. As it can be seen,
the methanolic fractions have the highest phenolic content. Ethyl acetate seems to be the solvent, that concentrates best phenolic substances of intermediate polarity.
This is in accordance with findings by Chung et al.
(1999), Parejo et al. (2002)