Açaí (Euterpe oleracea Mart.) is a tropical palm tree appreciated for its attractive beauty and for nutritional purposes. Chemical studies have revealed the presence of fatty acids and steroids. In the present work, it has been tested the action of the extracts obtained from the fruits and flowers on the nitric oxide (NO) production, a very important molecule with a lot of physiological rules such as vasodilatation, neurotransmission, tumoricidal and cytotoxic activity. Cells RAW 264.7 stimulated with bacterial lipopolysaccharide (LPS, 100 ng/ml) and interferonalpha (IFN-alpha, 10 U/ml) produce large amounts of nitric oxide (35 μM) when compared with non-stimulated cells (3μM). The hexane, dichloromethane, ethyl acetate and n-butanol extracts have shown high inhibition capacity, concentration-dependent in the cells activated with LPS and IFN-alpha, and the highest concentration has promoted almost 100 % of inhibition. We also have tested if the inhibitory effect was due to a scavenger action using a NO donor, the SNAP. Only the ethyl acetate extract has shown significant scavenger action. At this moment an effort is going on to try to understand the possible mechanisms associated to the inhibition of those extracts.