title: Interactions of Kraft lignin and wheat gluten during biomaterial processing: evidence for the role of phenolic groups.
abstract: The chemical interactions between Kraft lignin and wheat gluten under processing conditions were investigated by determining the extent of the protein network formation. To clarify the role of different chemical functions found in lignin, the effect of Kraft lignin was compared with that of an esterified lignin, in which hydroxyl groups had been suppressed by esterification, and with a series of simple aromatics and phenolic structures with different functionalities (conjugated double bonds, hydroxyl, carboxylic acid, and aldehyde). The protein solubility was determined by using the Kjeldahl method. The role of the hydroxyl function was assessed by the significantly lower effect of esterified lignin. The importance of the phenolic radical scavenging structure is evidenced by the effect of guaiacol, which results in a behavior similar to that of the Kraft lignin. In addition, the significant effect of conjugated double bonds on gluten reactivity, through nucleophilic addition, was demonstrated.
authors.affiliation: Bioplastic Research Unit, Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hatyai, Songkhla, Thailand.
authors.forename: Kaewta
authors.initials: K
authors.lastname: Kaewtatip
authors.forename: Paul
authors.initials: P
authors.lastname: Menut
authors.forename: Remi
authors.initials: R
authors.lastname: Auvergne
authors.forename: Varaporn
authors.initials: V
authors.lastname: Tanrattanakul
authors.forename: Marie-Helene
authors.initials: MH
authors.lastname: Morel
authors.forename: Stephane
authors.initials: S
authors.lastname: Guilbert
mesh_terms: D005511:Food Handling; D005983:Glutens / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry*; D015394:Molecular Structure; D010636:Phenols / Q000032:analysis*; D011485:Protein Binding; D012995:Solubility; D014908:Triticum / Q000737:chemistry*
chemical_list: D010636:Phenols; D005983:Glutens; C076151:Kraft lignin; D008031:Lignin