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An Acai Berry Antioxidant Mystery
Acai may indeed be a "Super Food", as described by Harvard University physician, Dr. Nicholas Perricone, in his book entitled The Perricone Promise. However, this fruit is only super when the source is preserved through freeze drying as described in
Why Is The Acai Berry Freeze Dried?
No matter how one tries to compare different foods to Acai fruit or to freeze dried Acai, the freeze dried fruit is superior in oxygen radical absorption scavenging capacity (ORAC) to all other fruits and vegetables, even when the comparison is controlled for moisture content. And it is certainly far superior to spray dried Acai, which loses most of its antioxidant activity in the process.
This brings us to one of the most puzzling findings about Acai. We know that freeze dried Acai is found to have an extraordinarily high
Total ORAC
capacity. Researchers assumed that this score meant that Acai probably had the highest content of the compounds (namely, anthocyanins, proanthocyanidins and other polyphenolic compounds) that contribute to its antioxidant activity as a food. But to everyone’s surprise, freeze dried Acai turns out to have much lower levels of these compounds than are found in blueberries, or in other berries with elevated ORAC values.
To make matters even more puzzling, consider the following information: The total phenolics in Acai were found to be only 13.9 mg/g Gallic Acid Equivalents (GAE). In a recent paper, the ratio between hydrophilic ORAC and total phenolics was found to vary dramatically, from less than two to more than 100, for different groups of foods.
For most fruits and vegetables, this ratio is about 10. However, the ratio found in Acai is 50,
five times greater than the ratio found in any other fruit. This "unusual" ratio raises questions about whether Acai contains much stronger antioxidants than are found in other berries, on an equal weight basis. Work is already underway, to determine why Acai has antioxidants that seem to be so much more powerful than those in any other fruit.
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