title: Binding of polyphenols to plant cell wall analogues - Part 2: Phenolic acids.
abstract: Bacterial cellulose and cellulose-pectin composites were used as well-defined model plant cell wall (PCW) systems to study the interaction between phenolic acids (PA) derived from purple carrot juice concentrate (PCJC) and PCW components. Significant PA depletion from solution occurred, with pure cellulose initially (30s-1h) absorbing more than cellulose-pectin composites in the first hour (ca 20% cf 10-15%), but with all composites absorbing similar levels (ca 30%) after several days. Individual PAs bound to different relative extents with caffeic acid>chlorogenic acid>ferulic acid. Extrapolation of data for these model systems to carrot puree suggests that nutritionally-significant amounts of PAs could bind to cell walls, potentially restricting bioavailability in the small intestine and, as a consequence, delivering PAs to the large intestine for fermentation and metabolism by gut bacteria.
authors.affiliation: ARC Centre of Excellence in Plant Cell Walls, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4072, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Padayachee
authors.forename: G
authors.initials: G
authors.lastname: Netzel
authors.forename: M
authors.initials: M
authors.lastname: Netzel
authors.forename: L
authors.initials: L
authors.lastname: Day
authors.forename: D
authors.initials: D
authors.lastname: Zabaras
authors.forename: D
authors.initials: D
authors.lastname: Mikkelsen
authors.forename: M J
authors.initials: MJ
authors.lastname: Gidley
mesh_terms: D016947:Acetobacteraceae / Q000737:chemistry / Q000378:metabolism; D002473:Cell Wall / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism; D018552:Daucus carota / Q000737:chemistry*; D062385:Hydroxybenzoates / Q000737:chemistry*; D008954:Models, Biological; D028321:Plant Preparations / Q000737:chemistry*; D059808:Polyphenols / Q000737:chemistry*
chemical_list: D062385:Hydroxybenzoates; D028321:Plant Preparations; D059808:Polyphenols; D002482:Cellulose; C017616:phenolic acid