Brazilian and Floridian acai were found to contain 24% insoluble solids. They were dark brown and were not
soluble in hexane, methanol or water. When 6 N HCl was added to the insoluble solids, they turned red, as do
anthocyanins. The solids were analyzed by CP-MAS 13C-NMR. Phenolic C-O, aromatic, glycosidic and aliphatic carbons
were detected. About 27% of the solids were hydrolyzed and solubilized by refluxing in conc HCl. Acai is a unique fruit
in that it is sold as a product that has a relatively high amount of insoluble solids. So, two things that genuine, unfiltered
acai should have are about 24% insoluble solids and the appropriate CP-MAS 13C-NMR spectrum.
Keywords: Acai, CP-MAS NMR, anthocyanins, aroma, minerals, edible proteins, dietry fibres, pulp, citric acid, fruit
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