First separated in Ferula foetida in 1866, ferulic acid is ubiquitous in the plant kingdom, including a number of vegetable sources. It is commonly found in the cell wall of woods, grasses, and corn hulls. They are usually tightly bound to carbohydrates as a glycosidic conjugate, an ester, or an amide. To extract it, one can apply concentrated alkali to the plant tissue.
Asterideudicot plants can also produce ferulic acid. The tea brewed from the leaves of yacón (Smallanthus sonchifolius), a plant traditionally grown in the northern and central Andes, contains quantities of ferulic acid. In legumes, the white bean variety navy bean is the richest source of ferulic acid among the common bean (Phaseolus vulgaris) varieties. It is also found in horse grams (Macrotyloma uniflorum).[citation needed]
Although there are many sources of ferulic acid in nature, its bioavailability depends on the form in which it is present: free ferulic acid has limited solubility in water, and hence poor bioavailability. In wheat grain, ferulic acid is found bound to cell wallpolysaccharides, allowing it to be released and absorbed in the small intestine.
In processed foods
In cereals, ferulic acid is localized in the bran – the hard outer layer of grain. In wheat, phenolic compounds are mainly found in the form of insoluble bound ferulic acid and may be relevant to resistance to wheat fungal diseases. It can be extracted from wheat bran and maize bran using concentrated alkali.
The highest known concentration of ferulic acid glucoside has been found in flaxseed (4.1±0.2g/kg). It is also found in barley grain.
Cooking sweetcorn releases increased levels of ferulic acid. As plant sterolesters, this compound is naturally found in rice bran oil, a popular cooking oil in several Asian countries.
In a proposed ferulic acid biosynthetic pathway for Escherichia coli, L-tyrosine is converted to 4-coumaric acid by tyrosine ammonia lyase, which is converted to caffeic acid by Sam5, which is then converted to ferulic acid by caffeic acid methyltransferase.
Ferulic acid, together with dihydroferulic acid, is a component of lignocellulose, serving to crosslink the lignin and polysaccharides, thereby conferring rigidity to the cell walls.
It is an intermediate in the synthesis of monolignols, the monomers of lignin, and is also used for the synthesis of lignans.
Ferulic acid is one of the compounds that initiate the vir (virulence) region of Agrobacterium tumefaciens, inducing it to infect plant cells.
In cosmetics, ferulic acid is used topically as an ultraviolet light absorber (sunscreen), a treatment for photoaging, and a treatment for skin darkening. The skin absorbs it at the same rate at acidic and neutral pH. It is believed to inhibit melanin formation by competitive inhibition with tyrosine. The oxidation of tyrosine is a necessary step in the formation of melanin.
↑Luthria, Devanand L.; Pastor-Corrales, Marcial A. (2006). "Phenolic acids content of fifteen dry edible bean (Phaseolus vulgaris L.) varieties". Journal of Food Composition and Analysis. 19 (2–3): 205–211. doi:10.1016/j.jfca.2005.09.003.
↑Anson, Nuria Mateo; van den Berg, Robin; Bast, Aalt; Haenen, Guido R. M. M. (2009). "Bioavailability of ferulic acid is determined by its bioaccessibility". Journal of Cereal Science. 49 (2): 296–300. doi:10.1016/j.jcs.2008.12.001.
↑Gelinas, Pierre; McKinnon, Carole M. (2006). "Effect of wheat variety, farming site, and bread-baking on total phenolics". International Journal of Food Science and Technology. 41 (3): 329–332. doi:10.1111/j.1365-2621.2005.01057.x.
↑Buranov, Anvar U.; Mazza, G. (2009). "Extraction and purification of ferulic acid from flax shives, wheat and corn bran by alkaline hydrolysis and pressurised solvents". Food Chemistry. 115 (4): 1542–1548. doi:10.1016/j.foodchem.2009.01.059.
↑Orthoefer, F. T. (2005). "Chapter 10: Rice Bran Oil". In Shahidi, F. (ed.). Bailey's Industrial Oil and Fat Products. Vol.2 (6thed.). John Wiley & Sons, Inc. p.465. ISBN978-0-471-38552-3. Retrieved 2012-03-01.
↑Boskov Hansen, H.; Andreasen, M.; Nielsen, M.; Larsen, L.; Knudsen, Bach K.; Meyer, A.; Christensen, L.; Hansen, Å. (2014). "Changes in dietary fibre, phenolic acids and activity of endogenous enzymes during rye bread-making". European Food Research and Technology. 214 (1): 33–42. doi:10.1007/s00217-001-0417-6. ISSN1438-2377. S2CID85239461.
↑Zhao, Zhaohui; Moghadasian, Mohammed H. (August 2008). "Chemistry, natural sources, dietary intake and pharmacokinetic properties of ferulic acid: A review". Food Chemistry. 109 (4): 691–702. doi:10.1016/j.foodchem.2008.02.039. PMID26049981.