title: Binding of dietary polyphenols to cellulose: structural and nutritional aspects.
abstract: The interactions between polyphenols and plant fibres play an important role in controlling the release of phenolic compounds from food matrices for absorption in the gastrointestinal tract. This study probed the molecular interactions of diverse polyphenols with cellulose fibres by using a pure cellulose-producing bacterial model. Alkali treatment of bacterial cellulose was an effective method for obtaining a high purity cellulose model for study of polyphenol binding. Representatives of different polyphenol classes all bound to cellulose spontaneously, rapidly, and to comparable extents (up to 60% w/w of cellulose). Langmuir binding isotherms were applied to determine quantitative aspects of the adsorption at equilibrium. The study indicated that binding was similar on a molar basis for ferulic acid, gallic acid, catechin and cyanidin-3-glucoside (but lower for chlorogenic acid), with the native charge of polyphenols a secondary factor in the interactions between polyphenols and cellulose.
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: Anh Dao T
authors.initials: AD
authors.lastname: Phan
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: Gabriele
authors.initials: G
authors.lastname: Netzel
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: Dongjie
authors.initials: D
authors.lastname: Wang
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: Bernadine M
authors.initials: BM
authors.lastname: Flanagan
authors.affiliation: School of Agriculture and Food Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia.
authors.forename: Bruce R
authors.initials: BR
authors.lastname: D'Arcy
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. Electronic address: m.gidley@uq.edu.au.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Gidley
mesh_terms: D000327:Adsorption; D000468:Alkalies / Q000737:chemistry; D000872:Anthocyanins / Q000737:chemistry / Q000378:metabolism; D002392:Catechin / Q000737:chemistry / Q000378:metabolism; D002482:Cellulose / Q000737:chemistry* / Q000378:metabolism; D003373:Coumaric Acids / Q000737:chemistry / Q000378:metabolism; D005707:Gallic Acid / Q000737:chemistry / Q000378:metabolism; D041822:Gluconacetobacter xylinus / Q000378:metabolism; D005960:Glucosides / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D018613:Microscopy, Confocal; D009747:Nutritional Physiological Phenomena; D059808:Polyphenols / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000468:Alkalies; D000872:Anthocyanins; D003373:Coumaric Acids; D005960:Glucosides; D059808:Polyphenols; C462279:cyanidin-3-O-beta-glucopyranoside; D005707:Gallic Acid; D002392:Catechin; D002482:Cellulose; C004999:ferulic acid
keywords: Anthocyanins; Langmuir binding isotherm; Non-covalent interactions; Phenolic acids