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| Section2 = }} Phytic acid (known as inositol hexakisphosphate (IP6), inositol polyphosphate, or phytate when in salt form), discovered in 1903, a saturated cyclic acid, is the principal storage form of phosphorus in many plant tissues, especially bran and seeds.〔(Phytic acid ). phytochemicals.info〕 It can be found in cereals and grains. Catabolites of phytic acid are called lower inositol polyphosphates. Examples are inositol penta- (IP5), tetra- (IP4), and triphosphate (IP3). ==Significance in agriculture== Phosphorus and inositol in phytate form are not, in general, bioavailable to nonruminant animals because these animals lack the digestive enzyme phytase required to remove phosphate from the inositol in the phytate molecule. Ruminants are readily able to digest phytate because of the phytase produced by rumen microorganisms. In most commercial agriculture, nonruminant livestock, such as swine, fowl, and fish, are fed mainly grains, such as maize, legumes, and soybeans. Because phytate from these grains and beans is unavailable for absorption, the unabsorbed phytate passes through the gastrointestinal tract, elevating the amount of phosphorus in the manure.〔 Excess phosphorus excretion can lead to environmental problems, such as eutrophication. The bioavailability of phytate phosphorus can be increased by supplementation of the diet with the enzyme phytase.〔.〕 Also, viable low-phytic acid mutant lines have been developed in several crop species in which the seeds have drastically reduced levels of phytic acid and concomitant increases in inorganic phosphorus. However, reported germination problems have hindered the use of these cultivars thus far. The use of sprouted grains will reduce the quantity of phytic acids in feed, with no significant reduction of nutritional value. Phytate variants also have the potential to be used in soil remediation, to immobilize uranium, nickel and other inorganic contaminants. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「phytic acid」の詳細全文を読む スポンサード リンク
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