title: Interrelationship between the zeta potential and viscoelastic properties in coacervates complexes.
abstract: The formation of the complex coacervate (CC) phases between gum Arabic (GA) and low molecular weight chitosan (Ch) and the interrelationship between the zeta-potential and viscoelastic properties of the coacervate phase were investigated. The maximum charge difference of biopolymers stock dispersion was displayed in a range of pH between 4.0 and 5.5. Titration experiment between the oppositely charged biopolymers showed that the isoelectric point was found at a biopolymers mass ratio (R[GA:Ch]) of R[5.5:1]. Turbidity, size and ζ-potential of the soluble complexes (SC) showed an interrelation with the complex coacervate yield (CCY). Higher CCY values (82.2-88.1%) were obtained in the range from R[3:1] to R[5.5:1]. Change the R[GA:Ch] in dispersion, make possible to produce CC's phases exhibiting cationic (R[1:1] and R[3:1]), neutral (R[5.5:1]) or anionic (R[9:1] and R[7:1]) charged. All CC's exhibited liquid-viscoelastic behavior at lower frequencies and a crossover between G″ and G' at higher frequencies.
authors.affiliation: Unidad de Tecnología Alimentaria, Centro de Investigación y Asistencia en Tecnología y Diseño del Estado de Jalisco, A.C. Av. Normalistas #800, Guadalajara, Jalisco 44270, México. hespinosa@ciatej.net.mx
authors.forename: Hugo
authors.initials: H
authors.lastname: Espinosa-Andrews
authors.forename: Karina Esmeralda
authors.initials: KE
authors.lastname: Enríquez-Ramírez
authors.forename: Eristeo
authors.initials: E
authors.lastname: García-Márquez
authors.forename: Cesar
authors.initials: C
authors.lastname: Ramírez-Santiago
authors.forename: Consuelo
authors.initials: C
authors.lastname: Lobato-Calleros
authors.forename: Jaime
authors.initials: J
authors.lastname: Vernon-Carter
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D004548:Elasticity; D006170:Gum Arabic / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D012212:Rheology; D013499:Surface Properties; D014783:Viscosity
chemical_list: D006170:Gum Arabic; D048271:Chitosan