The TPCs ofthe fractions were in the order of EAF > CF > PEF > BF >AF
and their values were described in Table 1. These differences can
be explained by the different polarity of the solvents, the solubility
of phenolics, the degree of polymerization of phenolics, and their
interactions. Our results were in accordance with those of other
studies which reported that the recovery of phenolic compounds
was dependent on the solvent used and its polarity (Kchaou et al.,
2013; Roby et al., 2013). It was also noticed that contents ofthe phenolic
compounds in the fractions were higher than that in ethanol
extract. Similar finding was also reported by Tongpoothorn et al.
(2012), who mentioned that this could be due to more interfering
substances presenting in the ethanol extract (0.69 mg GAE/g).
Although the yield was lower in EAF than those in other
fractions, the EAF was significantly rich (p < 0.05) in phenolic compounds
than other fractions. In addition,the CF showed both higher
yield and phenolic content (177.33 mg (GAE)/g). These amounts
were comparable with the results described for other plant extracts
(147.6 ± 1.85 mg GAE/g in Thymelaea hirsuta) (Trigui et al., 2013).
These results suggested thatthere might be higher amounts of phenolic
compounds with medium polarity in C. violaceum, which is
accord with the report by Cho et al. (2011). However, more different
results have been reported by several authors in different plant
extracts, which suggested thatthe more polar the solvent was used,
the higher amount of total phenolics were extracted