The first data emerging is that the juice obtained from the whole
fruit (PJ1) differs from the others as it shows the lowest levels of
acidity, soluble substances, proteins and polyphenols contents but
the higher antioxidant activity, which is not correlated to the
observed low polyphenols content. Results agree with those reported
by Tzulker et al. (2007), who showed that the homogenates
prepared from the whole fruit exhibited an approximately 20-fold
higher antioxidant activity than the aril juice, while polyphenol
content increased only about 6.5-fold, suggesting that polyphenols
are not the only contributors to antioxidant activity, and other
phytochemicals, contained in the peels may also contribute. Also
Gil et al. (2000) proposed that the peels contain a high content of
bioactive compounds, which contribute to increase the antioxidant
activity of the homogenates.