Phytanic acid (or 3,7,11,15-tetramethyl hexadecanoic acid) is a branched chain fatty acid that humans can obtain through the consumption of dairy products, ruminant animal fats, and certain fish.[1]Western diets are estimated to provide 50–100 mg of phytanic acid per day.[2] In a study conducted in Oxford, individuals who consumed meat had, on average, a 6.7-fold higher geometric mean plasma phytanic acid concentration than did vegans.[3]
In ruminant animals, the gut fermentation of ingested plant materials liberates phytol, a constituent of chlorophyll, which is then converted to phytanic acid and stored in fats.[7] In contrast to observations made in humans, there is indirect evidence that diverse non-human primates, including the great apes other than humans (bonobos, chimpanzees, gorillas and orangutans), can derive significant amounts of phytanic acid from the hindgut fermentation of plant materials.[8][9]
Insects, such as the sumac flea beetle, are reported to use phytol and its metabolites (e.g. phytanic acid) as chemical deterrents against predation.[11] These compounds originate from host plants.
^Brown, P. J.; et al. (1993). "The determination of phytanic acid and phytol in certain foods and the application of this knowledge to the choice of suitable convenience foods for patients with Refsum's disease". Journal of Human Nutrition and Dietetics. 6: 295–305. doi:10.1111/j.1365-277x.1993.tb00375.x.
^Steinberg, D. Phytanic acid storage disease (Refsum's disease). In: Metabolic Basis of Inherited Disease. Edited by Stanbury JB, Wyngarden JB, Fredericksen DS, Goldstein JL, Brown MS, 5th edn. New York: McGraw Hill; 1983: 731-747.
^Allen, N. E.; Grace, P. B.; Ginn, A.; Travis, R. C.; Roddam, A. W.; Appleby, P. N.; Key, T. (2007). "Phytanic acid: Measurement of plasma concentrations by gas–liquid chromatography–mass spectrometry analysis and associations with diet and other plasma fatty acids". British Journal of Nutrition. 99 (3): 653–659. doi:10.1017/S000711450782407X. PMID 17868488.
^Brink, D. M.; Wanders, R. J. A. (2006). "Phytanic acid: Production from phytol, its breakdown and role in human disease". Cellular and Molecular Life Sciences. 63 (15): 1752–1765. doi:10.1007/s00018-005-5463-y. PMID 16799769.
^Quintaliani, G.; Buoncristiani, U.; Orecchini, A.; Pierini, P.; Ricci, R.; Reboldi, G. P. (1994). "The Umbria Regional Registry for hemodialyzed and transplanted patients. Preliminary experience with an informatic procedure". Contributions to Nephrology. 109: 96–99. doi:10.1159/000423294. PMID 7956237.
^Komen, J. C.; Komen, R. J. A. (2007). "Peroxisomes, Refsum's disease and the α- and ω-oxidation of phytanic acid". Biochemical Society Transactions. 35 (Pt 5): 865–869. doi:10.1042/BST0350865. PMID 17956234.
^Verhoeven, N. M.; Wanders, R. J.; Poll-The, B. T.; Saudubray, J. M.; Jakobs, C. (1998). "The metabolism of phytanic acid and pristanic acid in man: a review". Journal of Inherited Metabolic Disease. 21 (7): 697–728. doi:10.1023/A:1005476631419. PMID 9819701.
^Watkins, P. A.; Moser, A. B.; Toomer, C. B.; Steinberg, S. J.; Moser, H. W.; Karaman, M. W.; Ramaswamy, K.; Siegmund, K. D.; Lee, D. R.; Ely, J. J.; Ryder, O. A.; Hacia, J. G. (2010). "Identification of differences in human and great ape phytanic acid metabolism that could influence gene expression profiles and physiological functions". BMC Physiology. 10: 19. doi:10.1186/1472-6793-10-19. PMC2964658. PMID 20932325.
^Moser, A. B.; Hey, J.; Dranchak, P. K.; Karaman, M. W.; Zhao, J.; Cox, L. A.; Ryder, O. A.; Hacia, J. G. (2013). "Diverse captive non-human primates with phytanic acid-deficient diets rich in plant products have substantial phytanic acid levels in their red blood cells". Lipids in Health and Disease. 12 (1): 10. doi:10.1186/1476-511X-12-10. PMC3571895. PMID 23379307.
^Rezanka, T.; Dembitsky, V. M. (1993). "Isoprenoid polyunsaturated fatty acids from freshwater sponges". Journal of Natural Products. 56 (11): 1898–1904. doi:10.1021/np50101a005.
^Venci, F.V.; Morton, T.C. (1998). "The shield defense of the sumac flea beetle, Blepharida rhois (Chrysomelidae: Alticinae)". Chemoecology. 8: 25–32. doi:10.1007/PL00001800.
^Gloerich, J.; Van Vlies, N.; Jansen, G. A.; Denis, S.; Ruiter, J. P. N.; Van Werkhoven, M. A.; Duran, M.; Vaz, F. M.; Wanders, R. J. A. (2005). "A phytol-enriched diet induces changes in fatty acid metabolism in mice both via PPAR -dependent and -independent pathways". The Journal of Lipid Research. 46 (4): 716–26. doi:10.1194/jlr.M400337-JLR200. PMID 15654129.
^Kitareewan, S.; Burka, L. T.; Tomer, K. B.; Parker, C. E.; Deterding, L. J.; Stevens, R. D.; Forman, B. M.; Mais, D. E.; Heyman, R. A.; McMorris, T.; Weinberger, C. (1996). "Phytol metabolites are circulating dietary factors that activate the nuclear receptor RXR". Molecular Biology of the Cell. 7 (8): 1153–1166. doi:10.1091/mbc.7.8.1153. PMC275969. PMID 8856661.