Extraction of phenolic-carbohydrate complexes from graminaceous cell walls

Xylan and xylan derivatives - biopolymers with valuable properties, 1. Naturally occurring xylans structures, isolation procedures and properties

“…For the extraction of feruloylated xylans, which can be utilized as a wound management aid 39) , the use of dimethyl sulfoxide, very dilute aqueous alkali hydroxide solutions, hot water, and steaming have been studied [105][106][107][108] . However, mild steaming conditions have to be applied to recover polymeric xylan.…”

Xylans of Industrial and Biomedical Importance

“…Xylans contribute to the effects of dietary fibre upon some biochemical and physiological processes in human and animal organisms (Asp et aI., 1993;Hromadkova and Ebringerova, 1994;Chesson, 1995;Baghurst et til., 1996). The best documented physiological effects of cereals, which represent the most abundant xylan fibre sources, are the faecal bulking effect and the lowering of blood cholesterol and decrease of postprandial glucose and insulin responses.…”

An Attempt to Identify the Low Molecular Feruloylated Oligosaccharides in Beer

“…The methods used during the study were not sufficient to state how many ferulic acid residues were esterified to feruloylated oligosaccharides isolated from beer. Nevertheless, taking under consideration the composition of arabinoxylans in barley and malt and degree of esterification of arabinoxylan chains with ferulic acid 8,21,33 , it can be speculated that only one ferulic acid residue formed the ester bond with the oligosaccharides. It must be noted that the presented work was a first attempt to identify the fine structure of feruloylated oligosaccharides in beer.…”

“…Ferulic acid is present in barley mainly in the ester form in arabinoxylans, and only about 1% of the total ferulic acid in the barley kernel is present in the free form 9,10 . The esterification of ferulic acid to arabinoxylan chains, as well as the role of ferulic acid in the structure of cell walls, has been described in detail; diferulic bridges between arabinoxylan chains were identified and the role of these structures in plant defence systems have been clarified 1,8,21,33 . Arabinoxylans are present in malt mainly in the form of ␤-1,4-xylopyranose chains with xylose residues substituted with arabinose in the C2 position (ca.…”