Gallic acid and p-hydroxybenzoic acid were found in all fractions.
By comparing the phenolic acids to all fractions, the pulp fractions
contained the highest level of p-hydroxybenzoic acid and
ferulic acid, with concentrations from 2.30 to 60.31 and 6.08 to
92.94 mg/g, respectively. Ferulic was the most dominant phenolic
acid in the peel fractions. In addition, protocatechuic acid and sinapic
acid were minor constituents in gac fruit, whilst vanillic acid
was not detected in all fractions. It is their role as dietary antioxidants
that have received the most attention in recent literature
(Robbins, 2003). Because of their ubiquitous presence in plantbased
foods, humans consume phenolic acids on a daily basis.
The estimated range of consumption is 25 mg–1 g a day depending
on the diet (fruit, vegetables, grains, teas, coffees, spices) (Clifford,
1999; Robbins, 2003).