Organic Acai Powder (Euterpe oleracea)

A staple of the Brazilian diet for centuries, açaí recently merited superfood status when it was featured in numerous publications and television shows nationwide. Modern scientists must have only confirmed what native Brazilians already knew—that açaí was a truly unique superfruit. With total ORAC (antioxidant) activity 200%-750% higher than any fruit or vegetable ever tested, based on USDA data, açaí is a must-have for any juice blend or nutritional beverage

What is Acai Fruit

The fruit, a small, round, black-purple drupe about 1 inch (25 mm) in diameter, similar in appearance and size to a grape but with less pulp, is produced in branched panicles of 700 to 900 fruits. Two crops of fruit are produced each year. The fruit has a single large seed about 0.25-0.40 inch (7–10 mm) in diameter. The skin of the ripe fruits is a deep purple color, or green, depending on the kind of açaí and its maturity. The mesocarp (layer under skin containing enormous amounts of Essential Fatty Acids) is pulpy and thin, with a consistent thickness of 1 mm or less. It surrounds the voluminous and hard endocarp which contains a seed with a diminutive embryo and abundant endosperm.[citation needed] The seed makes up about 80% of the fruit (Schauss, 2006c).

The berries are harvested as food. In a study of three traditional Caboclo populations in the Amazon region of Brazil, açaí palm was described as the most important plant species because the fruit makes up such a major component of diet (up to 42% of the total food intake by weight) and is economically valuable in the region (Murrieta et al., 1999).

The juice and pulp of açaí fruits (Euterpe oleracea) are frequently used in various juice blends, smoothies, sodas, and other beverages. In northern Brazil, açaí (or jussara, which is one of the fruit's common folk names) is traditionally served in gourds called "cuias" with tapioca and, depending on the local preference, can be consumed either salty or sweet (sugar, rapadura and honey are known to be used in the mix). Açaí has become popular in southern Brazil where it is consumed cold as açaí na tigela ("açaí in the bowl"), mostly mixed with granola — a fad in which açai is considered an energizer. Açaí is also widely consumed in Brazil as an ice cream flavor or juice.

As the high fat content of açaí (Nutritional content, below) indicates it would deteriorate rapidly after harvest, its raw material is generally available outside the immediate growing region only as juice or fruit pulp that has been frozen or processed as a pulp powder or freeze-dried powder. Several companies now manufacture juices, health drinks, yoghurts, and sorbets made from açaí berries, often in combination with other fruits.

Other uses

Apart from the use of its berries as food, the açai palm has other commercial uses. Leaves may be made into hats, mats, baskets, brooms and roof thatch for homes, and trunk wood, resistant to pests, for building construction (Silva, 2005).

Comprising 80% of the berry mass, seeds may be ground for livestock food or as a component of organic soil for plants. Planted seeds are used for new palm tree stock which, under the right growing conditions, requires months to form seedlings.[citation needed]

The seeds are a source of polyunsaturated and saturated fatty Acid (Silva, 2005) and tree trunks may be processed to yield minerals (Dyer, 1996).

Nutritional content

Most of the research to date on açaí has focused on a particular freeze-dried form referred to as Opti-açaí. This powder preparation of freeze-dried açaí fruit pulp and skin was reported to contain (per 100 g of extract) 533.9 calories, 52.2 g carbohydrates, 8.1 g protein, and 32.5 g total fat. The carbohydrate portion included 44.2 g of fiber.[2] The powder was also shown to contain (per 100 g): negligible vitamin C, 260 mg calcium, 4.4 mg iron, and 1002 U vitamin A, as well as aspartic acid and glutamic acid; the amino acid content was 7.59% of total dry weight.

Açaí has an exceptional content of fats, including oleic acid (56.2% of total), palmitic acid (24.1% of total), and linoleic acid (12.5% of total),[2] and also contains a high amount of beta-sitosterol (78-91% of total sterols).[2][3] These oil compartments in açaí fruit harbor dense contents of polyphenols such as procyanidin oligmers and vanillic acid, syringic acid, p-hydroxybenzoic acid, protocatechuic acid, and ferulic acid which were shown to degrade substantially during storage or exposure to heat.[4]

Antioxidants of açaí raw materials

A comparative analysis reported that açaí had intermediate antioxidant potency among a variety of frozen juice pulps tested. Antioxidant potency was: acerola > mango > strawberry > grapes > açaí > guava > mulberry > graviola > passion fruit > cupuaçu > pineapple.[5]

A powdered preparation of freeze-dried açaí fruit pulp and skin was shown to contain anthocyanins (3.19 mg/g), including cyanidin 3-glucoside and cyanidin 3-rutinoside,[2] yet the contribution of anthocyanins to overall antioxidant capacity of açaí is only about 10%.[6] The powdered preparation was also reported to contain twelve flavonoid-like compounds, including homoorientin, orientin, taxifolin deoxyhexose, isovitexin, scoparin, as well as proanthocyanidins (12.89 mg/g), and low levels of resveratrol (1.1 µg/g).[2]

In a study of different açaí varieties for their antioxidant capacity, a white species displayed no antioxidant activity against different oxygen radicals, whereas the purple variety most often used commercially was excellent against peroxyl radicals, good against peroxynitrite and poor against hydroxyl radicals.[6]

Freeze-dried açaí powder was found to have high antioxidant activity against superoxide (1614 units/g) and peroxyl radicals (1027 µmol TE/g) and milder activity for peroxynitrite and hydroxyl radicals.[7] The powder was reported to inhibit hydrogen peroxide-induced oxidation in neutrophils, and to have a slight stimulatory effect on nitric oxide production by lipopolysaccharide-stimulated macrophages in vitro.[7]

Extracts of açaí seeds were reported to have antioxidant capacity against peroxyl radicals, similar to the capacity of the pulp, with higher antioxidant capacity against peroxynitrite and hydroxyl radicals.[8]

Antioxidant activity of açaí juice

When a commercial açaí juice was compared for in vitro antioxidant capacity against nine other fruit juices, wine or tea, it ranked lower than pomegranate, Concord grape or blueberry juice and red wine, was the same as black cherry or cranberry juice, and was higher than orange or apple juice and tea.[9]

Studies have demonstrated that blood antioxidant capacity increases within two hours of consuming a commercial açaí juice.[10]

Other research

Freeze-dried açaí powder was shown to have mild inhibitory effects on cyclooxygenase enzymes COX-1 and COX-2,[7] and chemically-extracted polyphenolic-rich fractions from açaí were reported to reduce the proliferation of HL-60 (experimental leukemia) cells in vitro.[11] Similar anti-cancer effects in vitro were demonstrated with extracts from açaí pulp oil.[12] Orally-administered açaí has been tested as a contrast agent for magnetic resonance imaging of the gastrointestinal system.[13] Its anthocyanins have also been characterized for stability as a natural food coloring agent.[14]

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