41 and 531.15 mg GAE 100 g-1 ffp, respectively. Some studies have shown the influence of the extraction solvent on the extractability of phenolic compounds and the consequent effect on the extract’s bioactivity (Rusak et al., 2008 and Zhao and Hall, 2008). Although in some cases the correlation between phenolic compounds and antioxidant potential is absent, the majority of studies show a positive
correlation (Luximon-Ramma et al., 2003, Pantelidis et al., 2007 and Sun et al., 2002). Following this trend, acetone extracts richer in phenolic compounds presented higher Torin 1 cost DPPH scavenging capacity, indicating a positive correlation between phenolic content and antioxidant potential, which has also been seen in other fruit, plants, juices and wine (Rusak et al., 2008 and Zhao and Hall, 2008). Among the six araçá accessions studied, the red ones showed on average higher antioxidant activity; particularly AR9 acetone extract, which had 45.3% inhibition of
the DPPH radical, in agreement with the fact that fruit containing anthocyanins have high antioxidant potential (Pantelidis et al., 2007 and Sun et al., 2002). However, total anthocyanin Selleckchem Epacadostat in red araçá was relatively low, 4.82–5.05 mg of cyanidin-3-glucoside 100 g–1 of fresh fruit pulp (mg C3G 100 g-1 of ffp), when compared to most red fruit, including Surinam Cherry, Morus sp., and blueberry, with 9.6–138.9, 45.2–47.7, and 72.0–128.0 mg C3G 100 g-1 of ffp, respectively ( Jacques Tryptophan synthase et al., 2009).(−)-Epicatechin, followed by gallic acid, were the main phenolic compounds present in all the investigated genotypes for both yellow and red araçá. Studies have shown (−)-epicatechin present in foods to contribute to the reduction of the risks
of developing cardiovascular diseases, due to its role on vasodilation, lowering blood pressure and as an antioxidant defence component, in addition to its antimicrobial potential ( Katalinić et al., 2010 and Schroeter et al., 2005). Moreover, polyphenols could play an important role in cancer prevention by epigenetics mechanisms, mainly by DNA methylation, preventing histone modification and regulation of miRNA expression ( Link et al., 2010). Quercetin and myricetin found in berries, apples, tea and garlic, usually in higher concentration on the skin of fruit ( Riihinen, Jaakola, Kãrenlampi, & Hohtola, 2008) were however, in araçá, present in very low levels ( Table 3). Potential protective action against oxidative stress determined through the DPPH radical scavenging method was not substantial when compared to the antioxidant activity determined by the yeast protective experiment indicated. These results reflect limitations of indirect in vitro radical scavenging measurements.