Antioxidant capacity and other bioactivities of the freeze-dried
Amazonian palm berry, Euterpe oleraceae mart. (acai).
Agric Food Chem. 2006 Nov 1;54(22):8604-10.
Schauss AG, Wu X, Prior RL, Ou B, Huang D, Owens J, Agarwal A, Jensen GS, Hart
AN, Shanbrom E.
Natural and Medicinal Products Research, AIMBR Life Sciences, 4117 South Meridian,
Puyallup, Washington 98373, USA. email@example.com
The fruit of Euterpe oleraceae, commonly known as acai, has been demonstrated to
exhibit significantly high antioxidant capacity in vitro, especially for superoxide and
peroxyl scavenging, and, therefore, may have possible health benefits. In this study, the
antioxidant capacities of freeze-dried acai fruit pulp/skin powder (OptiAcai) were
evaluated by different assays with various free radical sources. It was found to have
exceptional activity against superoxide in the superoxide scavenging (SOD) assay, the
highest of any food reported to date against the peroxyl radical as measured by the
oxygen radical absorbance capacity assay with fluorescein as the fluorescent probe
(ORACFL), and mild activity against both the peroxynitrite and hydroxyl radical by the
peroxynitrite averting capacity (NORAC) and hydroxyl radical averting capacity
(HORAC) assays, respectively. The SOD of acai was 1614 units/g, an extremely high
scavenging capacity for O2*-, by far the highest of any fruit or vegetable tested to date.
Total phenolics were also tested as comparison. In the total antioxidant (TAO) assay,
antioxidants in acai were differentiated into "slow-acting" and "fast-acting" components.
An assay measuring inhibition of reactive oxygen species (ROS) formation in freshly
purified human neutrophils showed that antioxidants in acai are able to enter human cells
in a fully functional form and to perform an oxygen quenching function at very low
doses. Furthermore, other bioactivities related to anti-inflammation and immune
functions were also investigated. Acai was found to be a potential cyclooxygenase
(COX)-1 and CO