期刊
PHYTOCHEMISTRY
卷 67, 期 12, 页码 1276-1286出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.phytochem.2006.04.018
关键词
Zea mays L; graminaceae; maize bran; feruloylated oligosaccharides; ferulic acid; p-coumaroylated arabinose; coumaric acid; arabinoxylans; cell wall cross-linking; NMR
资金
- NCRR NIH HHS [RR02301, RR08438, RR02781] Funding Source: Medline
- NATIONAL CENTER FOR RESEARCH RESOURCES [S10RR008438, P41RR002301, S10RR002781] Funding Source: NIH RePORTER
Three complex heteroxylan side-chains acylated with ferulate and one arabinosyl ester of p-coumaric acid have been isolated from maize bran insoluble fibre after acidic hydrolysis and fractionation by gel permeation chromatography and semi-preparative RP-HPLC. The complete structural elucidation of all isolated compounds was achieved by 1D/2D NMR spectroscopy and HPLC-MS in combination with methylation analysis. The absolute configuration of the carbohydrate constituents was determined by chiral GC after acidic hydrolysis and trifluoroacetylation. The identified feruloylated tetrasaccharides alpha-D-Xylopyranosyl-(1 -> 3)-alpha-L-galactopyranosyl(1 -> 2)-beta-D-xylopyranosyl-(1 -> 2)-5-O-trans-feruloyl-L-arabinofuranose (FAXGX) and alpha-D-galactopyranosyl-(1 -> 3)-O(-L-galactopyranosyl-(1 -> 2)-beta-D-Xylopyranosyl-(1 -> 2)-5-O-trans-feruloyl-L-arabinofuranose (FAXGG) are the most complex heteroxylan side-chains from maize bran that have been isolated to date. The isolated trisaccharide alpha-L-galactopyranosyl-(1 -> 2)-beta-D-Xylopyranosyl-(1 -> 2)5-O-trans-feruloyl-L-arabinofuranose (FAXG) contributes to the complexity of heteroxylan side-chains from maize bran and 5-O-trans-p-coumaroyl-L-arabinofuranose represents the first p-coumaroylated heteroxylan side-chain isolated from cereal grains. Complex feruloylated heteroxylan side-chains are possibly, like ferulate cross-linking of the heteroxylans and binding of heteroxylans to lignin, a factor contributing to limited enzymatic degradation of fibre. (c) 2006 Elsevier Ltd. All rights reserved.
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