Spirulina is the common name for human and animal food supplements produced primarily from two species of cyanobacteria: Arthrospira platensis, and Arthrospira maxima. These and other Arthrospira species were once classified in the genus Spirulina. There is now agreement that they are distinct genera, and that the food species belong to Arthrospira; nonetheless, the inaccurate term "Spirulina" remains the popular name. Spirulina is cultivated around the world, and is used as a human dietary supplement, available in tablet, flake, and powder form. It is also used as a feed supplement in the aquaculture and poultry industries.
Spirulina contains unusually high amounts of protein, between 55 and 77% by dry weight, depending upon the source. It is a complete protein, containing all essential amino acids, though with reduced amounts of methionine, cysteine, and lysine, as compared to standard proteins such as that from meat, eggs, or milk; it is, however, superior to all standard plant protein, such as that from legumes. [5][6]
Essential Fatty Acids
Spirulina tabletsSpirulina is rich in gamma-linolenic acid (GLA). However, one needs to use 5-10 grams of dried spirulina to obtain similar quantities as that found in 1000 mg evening primrose oil or 500 mg borage oil. Spirulina also provides small quantities of other fatty acids such as alpha-linolenic acid (ALA), linoleic acid (LA), stearidonic acid (SDA), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and arachidonic acid (AA). [6][7]
Vitamins
Spirulina contains most vitamins in high quantities, but are richest in vitamin A (in the form of beta-carotene), vitamin D, vitamin K, vitamin B1, vitamin B2 and vitamin B12. [6][7] The bioavailability of vitamin B12 in Spirulina is in dispute. Several biological assays have been used to verify the presence of vitamin B12. [8] The most popular is the US Pharmacopeia method using the Lactobacillus leichmannii assay. Studies using this method have shown Spirulina to be a minimal source of bioavailable vitamin B12. [9] However, this assay does not actually differentiate between human bioavailable and non-human bioavailable B12. A more recently developed assay performed by a grower of spirulina has shown Spirulina to be a significant source of bioavailable B12. [10]
Minerals
Dried spirulina has a very high concentration of mineral ash. It is a very rich source of iron, and also contains many other minerals such as manganese, chromium, selenium, magnesium, calcium and phosphorus. Some spirulina brands add zinc during the cultivation period, so that the supplement ends up very rich in this mineral. It should be noted, that even though spirulina is rich in many minerals, the dosages used for supplementation - 0.5-10 grams daily - provides relatively little of most of those minerals compared to the RDAs. Using more than 10 grams of dried spirulina could in time lead to iron and vitamin D toxicity.[6][7]
Photosynthetic Pigments
Spirulina contains many pigments including chlorophyll-a, xanthophyll, beta-carotene, echinenone, myxoxanthophyll, zeaxanthin, canthaxanthin, diatoxanthin, 3'-hydroxyechinenone, beta-cryptoxanthin, oscillaxanthin, plus the phycobiliproteins c-phycocyanin and allophycocyanin.
Source:http://en.wikipedia.org/wiki/Spirulina
Extract
The distilled or evaporated oils of foods or plants (such as nuts, seeds, fruits, vegetables, herbs, spices, bark, buds, roots, leaves, meat, poultry, seafood, fish, dairy foods, or eggs) that are dissolved in an alcohol base or allowed to dry to be used as a flavoring. Food extracts as they are often labeled, are used to add a concentrated flavor to many food dishes, especially baked goods and desserts, without adding additional volume. Available in solid (cubes, granules or powdered), liquid or jelled form, extracts may be labeled as pure, natural or artificial. Pure and natural extracts are governed by laws in many countries that require compliance with procedures that take the extract ingredients directly from the named flavor, such as extracting oils directly from the vanilla bean to make pure or natural vanilla extract. Artificial extracts are flavors that do not necessarily use any ingredients directly from a source named for the extract but instead used combinations of ingredients to arrive at a flavor representative of the named food extract, such as artificial lemon extract. Some of the most widely used extracts include vanilla, almond, anise, maple, peppermint, and numerous solid or jelled extracts such as beef and chicken bouillon or meat demi-glaces. As an example of how the pure and natural extract is made, vanilla extract is created by soaking vanilla beans in water and an alcohol-based solution where it ages for several months, during which time the vanilla flavor is extracted from the bean. Anise extract, a sweet licorice tasting flavoring, is produced by dissolving the oil of anise seeds into alcohol.
Grape extract is produced to assist with the wine making process. Compounds from the skin of grapes are extracted and added to the wine in order to impart tannin, color, and body into a wine. The characteristics of the wine can be changed dramatically by the amount of time the wine is in contact with the skins. If the grapes are in contact for too long, the resulting wine may be too potent, or what is sometimes called over-extracted.
Juices of fruits and vegetables are often extracted as juice extracts to be used similar to other food extracts, as a flavoring when preparing foods. A common utensil for the purpose of extracting lemon juice is available to assist with home recipes requiring a lemon flavoring.