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"IP6" redirects here. For the Internet Protocol revision, see IPv6.
"E391" redirects here. For other uses, see European route E391.
Phytic acid
Structural formula of phytic acid
Ball-and-stick model of phytic acid
  Carbon, C
  Hydrogen, H
  Oxygen, O
  Phosphorus, P
Space-filling model of phytic acid
Names
IUPAC name
(1R,2S,3r,4R,5S,6s)-cyclohexane-1,2,3,4,5,6-hexayl hexakis[dihydrogen (phosphate)]
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.001.369 Edit this at Wikidata
E number E391 (antioxidants, ...)
UNII
  • InChI=1S/C6H18O24P6/c7-31(8,9)25-1-2(26-32(10,11)12)4(28-34(16,17)18)6(30-36(22,23)24)5(29-35(19,20)21)3(1)27-33(13,14)15/h1-6H,(H2,7,8,9)(H2,10,11,12)(H2,13,14,15)(H2,16,17,18)(H2,19,20,21)(H2,22,23,24)/t1-,2-,3-,4+,5-,6- checkY
    Key: IMQLKJBTEOYOSI-GPIVLXJGSA-N checkY
  • InChI=1/C6H18O24P6/c7-31(8,9)25-1-2(26-32(10,11)12)4(28-34(16,17)18)6(30-36(22,23)24)5(29-35(19,20)21)3(1)27-33(13,14)15/h1-6H,(H2,7,8,9)(H2,10,11,12)(H2,13,14,15)(H2,16,17,18)(H2,19,20,21)(H2,22,23,24)/t1-,2-,3-,4+,5-,6-
    Key: IMQLKJBTEOYOSI-GPIVLXJGBP
  • [C@@H]1([C@@H]([C@@H]([C@@H]([C@H]([C@@H]1OP(=O)(O)O)OP(=O)(O)O)OP(=O)(O)O)OP(=O)(O)O)OP(=O)(O)O)OP(=O)(O)O
Properties
C6H18O24P6
Molar mass 660.029 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Phytic acid is a six-fold dihydrogenphosphate ester of inositol (specifically, of the myo isomer), also called inositol hexaphosphate, inositol hexakisphosphate (IP6) or inositol polyphosphate. At physiological pH, the phosphates are partially ionized, resulting in the phytate anion.

The (myo) phytate anion is a colorless species that has significant nutritional role as the principal storage form of phosphorus in many plant tissues, especially bran and seeds. It is also present in many legumes, cereals, and grains. Phytic acid and phytate have a strong binding affinity to the dietary minerals calcium, iron, and zinc, inhibiting their absorption in the small intestine.[1]

The lower inositol polyphosphates are inositol esters with less than six phosphates, such as inositol penta- (IP5), tetra- (IP4), and triphosphate (IP3). These occur in nature as catabolites of phytic acid.

Significance in agriculture

The hexavalent phytate anion.

Phytic acid was discovered in 1903.[2]

Generally, phosphorus and inositol in phytate form are not bioavailable to non-ruminant animals because these animals lack the enzyme phytase required to hydrolyze the inositol-phosphate linkages. Ruminants are able to digest phytate because of the phytase produced by rumen microorganisms.[3]

In most commercial agriculture, non-ruminant livestock, such as swine, fowl, and fish,[4] are fed mainly grains, such as maize, legumes, and soybeans.[5] 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.[3] Excess phosphorus excretion can lead to environmental problems, such as eutrophication.[6] The use of sprouted grains may reduce the quantity of phytic acids in feed, with no significant reduction of nutritional value.[7]

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.[8] However, germination problems have reportedly hindered the use of these cultivars thus far. This may be due to phytic acid's critical role in both phosphorus and metal ion storage.[9] Phytate variants also have the potential to be used in soil remediation, to immobilize uranium, nickel, and other inorganic contaminants.[10]

Biological effects

Plants

Although indigestible for many animals as they occur in seeds and grains, phytic acid and its metabolites have several important roles for the seedling plant.

Most notably, phytic acid functions as a phosphorus store, as an energy store, as a source of cations and as a source of myo-inositol (a cell wall precursor). Phytic acid is the principal storage form of phosphorus in plant seeds.[11]

In vitro

In animal cells, myo-inositol polyphosphates are ubiquitous, and phytic acid (myo-inositol hexakisphosphate) is the most abundant, with its concentration ranging from 10 to 100 μM in mammalian cells, depending on cell type and developmental stage.[12][13]

Phytic acid is not obtained from the animal diet, but must be synthesized inside the cell from phosphate and inositol (which in turn is produced from glucose, usually in the kidneys). The interaction of intracellular phytic acid with specific intracellular proteins has been investigated in vitro, and these interactions have been found to result in the inhibition or potentiation of the activities of those proteins.[14][15]

Inositol hexaphosphate facilitates the formation of the six-helix bundle and assembly of the immature HIV-1 Gag lattice. IP6 makes ionic contacts with two rings of lysine residues at the centre of the Gag hexamer. Proteolytic cleavage then unmasks an alternative binding site, where IP6 interaction promotes the assembly of the mature capsid lattice. These studies identify IP6 as a naturally occurring small molecule that promotes both assembly and maturation of HIV-1.[16]

Dentistry

IP6 has potential use in endodontics, adhesive, preventive, and regenerative dentistry, and in improving the characteristics and performance of dental materials.[17][18][19]

Food science

Phytic acid, mostly as phytate in the form of phytin, is found within the hulls and kernels of seeds,[20] including nuts, grains, and pulses.[1]

In-home food preparation techniques may break down the phytic acid in all of these foods. Simply cooking the food will reduce the phytic acid to some degree. More effective methods are soaking in an acid medium, sprouting, and lactic acid fermentation such as in sourdough and pickling. [21]

No detectable phytate (less than 0.02% of wet weight) was observed in vegetables such as scallion and cabbage leaves or in fruits such as apples, oranges, bananas, or pears.[22]

As a food additive, phytic acid is used as the preservative E391.[23][24]

Dry food sources of phytic acid[25][22][26][27][28][29][30][31]
Food Proportion by weight (g/100 g)
Min. Max.
Hulled Hemp Seed[20] 4.5 4.5
Pumpkin seed 4.3 4.3
Linseed 2.15 2.78
Sesame seeds flour 5.36 5.36
Chia seeds 0.96 1.16
Almonds 1.35 3.22
Brazil nuts 1.97 6.34
Coconut 0.36 0.36
Hazelnut 0.65 0.65
Peanut 0.95 1.76
Walnut 0.98 0.98
Maize (corn) 0.75 2.22
Oat 0.42 1.16
Oat meal 0.89 2.40
Brown rice 0.84 0.99
Polished rice 0.14 0.60
Wheat 0.39 1.35
Wheat flour 0.25 1.37
Wheat germ 0.08 1.14
Whole wheat bread 0.43 1.05
Beans, pinto 2.38 2.38
Buckwheat 1.00 1.00
Chickpeas 0.56 0.56
Lentils 0.44 0.50
Soybeans 1.00 2.22
Tofu 1.46 2.90
Soy beverage 1.24 1.24
Soy protein concentrate 1.24 2.17
New potato 0.18 0.34
Spinach 0.22 NR
Avocado fruit 0.51 0.51
Chestnuts[32] 0.47
Sunflower seeds 1.60
Fresh food sources of phytic acid[27]
Food Proportion by weight (%)
Min. Max.
Taro 0.143 0.195
Cassava 0.114 0.152

Dietary mineral absorption

Phytic acid has a strong affinity to the dietary trace elements, calcium, iron, and zinc, inhibiting their absorption from the small intestine.[1][33] Phytochemicals such as polyphenols and tannins also influence the binding.[34] When iron and zinc bind to phytic acid, they form insoluble precipitates and are far less absorbable in the intestines.[35][36]

Because phytic acid also can affect the absorption of iron, "dephytinization should be considered as a major strategy to improve iron nutrition during the weaning period".[37] Dephytinization by exogenous phytase to phytate-containing food is an approach being investigated to improve nutritional health in populations that are vulnerable to mineral deficiency due to their reliance on phytate-laden food staples. Crop breeding to increase mineral density (biofortification) or reducing phytate content are under preliminary research.[38]

See also

References

  1. ^ a b c Schlemmer, U.; Frølich, W.; Prieto, R. M.; Grases, F. (2009). "Phytate in foods and significance for humans: Food sources, intake, processing, bioavailability, protective role and analysis" (PDF). Molecular Nutrition & Food Research. 53 (Suppl 2): S330–75. doi:10.1002/mnfr.200900099. PMID 19774556.
  2. ^ Mullaney EJ, Ullah, Abul H.J. "Phytases: attributes, catalytic mechanisms, and applications" (PDF). United States Department of Agriculture–Agricultural Research Service. Archived from the original (PDF) on 2012-11-07. Retrieved May 18, 2012.
  3. ^ a b Klopfenstein TJ, Angel R, Cromwell G, Erickson GE, Fox DG, Parsons C, Satter LD, Sutton AL, Baker DH (July 2002). "Animal Diet Modification to Decrease the Potential for Nitrogen and Phosphorus Pollution". Council for Agricultural Science and Technology. 21.
  4. ^ Romarheim OH, Zhang C, Penn M, Liu YJ, Tian LX, Skrede A, Krogdahl Å, Storebakken T (2008). "Growth and intestinal morphology in cobia (Rachycentron canadum) fed extruded diets with two types of soybean meal partly replacing fish meal". Aquaculture Nutrition. 14 (2): 174–180. doi:10.1111/j.1365-2095.2007.00517.x.
  5. ^ Jezierny, D.; Mosenthin, R.; Weiss, E. (2010-05-01). "The use of grain legumes as a protein source in pig nutrition: A review". Animal Feed Science and Technology. 157 (3–4): 111–128. doi:10.1016/j.anifeedsci.2010.03.001.
  6. ^ Mallin MA (2003). "Industrialized Animal Production—A Major Source of Nutrient and Microbial Pollution to Aquatic Ecosystems". Population and Environment. 24 (5): 369–385. doi:10.1023/A:1023690824045. JSTOR 27503850. S2CID 154321894.
  7. ^ Malleshi, N. G.; Desikachar, H. S. R. (1986). "Nutritive value of malted millet flours". Plant Foods for Human Nutrition. 36 (3): 191–6. doi:10.1007/BF01092036.
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  20. ^ a b Ellison, Campbell; Moreno, Teresa; Catchpole, Owen; Fenton, Tina; Lagutin, Kirill; MacKenzie, Andrew; Mitchell, Kevin; Scott, Dawn (2021-07-01). "Extraction of hemp seed using near-critical CO2, propane and dimethyl ether". The Journal of Supercritical Fluids. 173: 105218. doi:10.1016/j.supflu.2021.105218. ISSN 0896-8446. S2CID 233822572.
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  23. ^ Functional Food - Improve Health through Adequate Food edited by María Chávarri Hueda, pg. 86
  24. ^ "Wise Eating, Made Easy".
  25. ^ Dephytinisation with Intrinsic Wheat Phytase and Iron Fortification Significantly Increase Iron Absorption from Fonio (Digitaria exilis) Meals in West African Women (2013)
  26. ^ Reddy NR, Sathe SK (2001). Food Phytates. Boca Raton: CRC. ISBN 978-1-56676-867-2.[page needed]
  27. ^ a b Phillippy BQ, Bland JM, Evens TJ (January 2003). "Ion chromatography of phytate in roots and tubers". Journal of Agricultural and Food Chemistry. 51 (2): 350–3. doi:10.1021/jf025827m. PMID 12517094.
  28. ^ Macfarlane BJ, Bezwoda WR, Bothwell TH, Baynes RD, Bothwell JE, MacPhail AP, Lamparelli RD, Mayet F (February 1988). "Inhibitory effect of nuts on iron absorption". The American Journal of Clinical Nutrition. 47 (2): 270–4. doi:10.1093/ajcn/47.2.270. PMID 3341259.
  29. ^ Gordon DT, Chao LS (March 1984). "Relationship of components in wheat bran and spinach to iron bioavailability in the anemic rat". The Journal of Nutrition. 114 (3): 526–35. doi:10.1093/jn/114.3.526. PMID 6321704.
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  32. ^ Scuhlz M. "Paleo Diet Guide: With Recipes in 30 Minutes or Less: Diabetes Heart Disease: Paleo Diet Friendly: Dairy Gluten Nut Soy Free Cookbook". PWPH Publications – via Google Books.
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  34. ^ Prom-u-thai C, Huang L, Glahn RP, Welch RM, Fukai S, Rerkasem B (2006). "Iron (Fe) bioavailability and the distribution of anti-Fe nutrition biochemicals in the unpolished, polished grain and bran fraction of five rice genotypes". Journal of the Science of Food and Agriculture. 86 (8): 1209–15. Bibcode:2006JSFA...86.1209P. doi:10.1002/jsfa.2471. Archived from the original on 2020-02-23. Retrieved 2018-12-29.
  35. ^ Hurrell RF (September 2003). "Influence of vegetable protein sources on trace element and mineral bioavailability". The Journal of Nutrition. 133 (9): 2973S–7S. doi:10.1093/jn/133.9.2973S. PMID 12949395.
  36. ^ Committee on Food Protection; Food and Nutrition Board; National Research Council (1973). "Phytates". Toxicants Occurring Naturally in Foods. National Academy of Sciences. pp. 363–371. ISBN 978-0-309-02117-3.
  37. ^ Hurrell RF, Reddy MB, Juillerat MA, Cook JD (May 2003). "Degradation of phytic acid in cereal porridges improves iron absorption by human subjects". The American Journal of Clinical Nutrition. 77 (5): 1213–9. CiteSeerX 10.1.1.333.4941. doi:10.1093/ajcn/77.5.1213. PMID 12716674.
  38. ^ Raboy, Victor (22 January 2020). "Low phytic acid crops: Observations based on four decades of research". Plants. 9 (2): 140. doi:10.3390/plants9020140. ISSN 2223-7747. PMC 7076677. PMID 31979164.
source: https://en.wikipedia.org/wiki/Phytic_acid