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Due to its importance in food, the structure of arabinoxylan from wheat grain and other cereals has been intensively studied. In particular, the arabinoxylan from wheat endosperm that gives rise to white flour has a simpler structure than that from most tissues. Apart from the structural features
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As with all xylan, the backbone of arabinoxylan chains is composed of a large number of 1,4-linked β-D-xylopyranosyl units. In arabinoxylan many of these xylose units are 3-linked with single α-L-arabinofuranosyl units and some of these arabinose in turn have ester-linked ferulic acid residues.
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and others. These acylated arabinosyl residues are frequently additionally substituted with 2-linked sugars. In lignified cell walls, there is strong evidence that feruloyl residues on arabinoxylan can be crosslinked into the lignin polymer, increasing recalcitrance to digestion.
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resides and other sugars and these arabinoxylan polymers are sometimes termed glucuronarabinoxylans or heteroxylans. Both backbone and sidechain sugar residues can be acetylated. Arabinosyl residues can be acylated with phenolics other than ferulic acid, in particular
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between arabinoxylan chains and with lignin. Whilst arabinose has been found linked to xylan in non-commelinid plants, ferulic acid has not been reported on these and unlike feruloyl-arabinoxylan these arabinoxylans are not
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Dervilly-Pinel, G; et al. (2004). "Investigation of the distribution of arabinose residues on the xylan backbone of water-soluble arabinoxylans from wheat flour".
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residues. Due to a low degree of crosslinking into the cell wall, some of this endosperm arabinoxylan is extractable in water, giving rise to soluble dietary fiber.
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and possibly higher oligomers that covalently crosslink arabinoxylan chains. This mode of cross-linking is a key feature of both primary and secondary cell walls in
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Marcotuli, Ilaria; Hsieh, Yves S.-Y.; Lahnstein, Jelle; Yap, Kuok; Burton, Rachel Anita; Blanco, Antonio; Fincher, Geoffrey Bruce; Gadaleta, Agata (13 April 2016).
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Rao, RS; Muralikrishna, G (2006). "Water soluble feruloyl arabinoxylans from rice and ragi: changes upon malting and their consequence on antioxidant activity".
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Izydorczyk, MS; Dexter, JE (2008). "Barley β-glucans and arabinoxylans: Molecular structure, physicochemical properties, and uses in food products–a Review".
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Guillon, F; Champ, M (2000). "Structural and physical properties of dietary fibres, and consequences of processing on human physiology".
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which are shown to exert various health benefits. In addition, arabinoxylans, owing to their bound phenolic acids, are shown to have
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Arabinoxylans from tissues other than endosperm are structurally more complex. The xylan backbone is often heavily substituted with
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activity. Their ion exchange capacity and viscosity are also partly responsible for their beneficial metabolic effects.
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237:"Structural Variation and Content of Arabinoxylans in Endosperm and Bran of Durum Wheat ( Triticum turgidum L.)"
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to them. Phenolic acids may also be involved in defense including protection against
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74:. The remainder of this article refers to feruloyl-arabinoxylan from cell walls of
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described above, it has xylose units di-substituted with 2 and 3-linked
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Arabinoxylans are one of the main components of soluble and insoluble
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45:. The term arabinoxylan usually refers to feruloyl-arabinoxylan from
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These feruloyl units can undergo radical oxidative coupling forming
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Wakabayashi K, et al (2005). Physiologia
Plantarum. 125:127–134
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Scheller, H. V., & Ulvskov, P. (2010). Hemicelluloses.
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Arabinoxylans chiefly serve a structural role in the
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241:Journal of Agricultural and Food Chemistry
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224:doi:10.1146/annurev-arplant-042809-112315
34:contains substantial amounts of another
26:found in both the primary and secondary
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53:containing moieties of the phenolic
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220:Annual Review of Plant Biology, 61
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185:"Hemicellulosic Polysaccharides"
368:10.1016/j.phytochem.2005.09.036
30:of plants which in addition to
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403:10.1016/s0963-9969(00)00038-7
341:10.1016/j.foodres.2008.04.001
305:10.1016/j.carbpol.2003.09.004
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391:Food Research International
329:Food Research International
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93:ferulic acid dehydrodimers
253:10.1021/acs.jafc.6b00103
293:Carbohydrate Polymers
61:(in the same way as
59:oxidative coupling
247:(14): 2883–2892.
195:on April 16, 2021
150:covalently linked
57:that can undergo
19:is a form of the
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121:p-coumaric acid
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65:units) forming
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356:Phytochemistry
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335:(9): 850–868.
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161:dietary fibers
146:phenolic acids
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125:sinapinic acid
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274:. Retrieved
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197:. Retrieved
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142:ferulic acid
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72:monophyletic
55:ferulic acid
17:Arabinoxylan
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362:(1): 91–9.
222:, 263-289.
165:antioxidant
138:plant cells
51:commelinids
428:Copolymers
417:Categories
276:5 February
171:References
148:which are
144:and other
101:commelinid
99:and other
80:commelinid
78:and other
67:crosslinks
49:and other
28:cell walls
271:0021-8561
132:Functions
123:but also
109:arabinose
103:species.
86:Structure
82:species.
43:arabinose
376:16289622
199:April 1,
189:uga.edu
97:grasses
76:grasses
47:grasses
36:pentose
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63:lignin
32:xylose
39:sugar
24:xylan
372:PMID
278:2023
267:ISSN
201:2020
399:doi
364:doi
337:doi
301:doi
257:hdl
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