title: Characterization of amphoteric multilayered thin films by means of zeta potential measurements.
abstract: Multilayer films of amphoteric methylated collagen were assembled on SOURCE 15S or SOURCE 15Q beads by sequential electrostatic deposition with negatively charged methylacrylic acid-hydroxyethyl methacrylate-methyl methacrylate (MAA-HEMA-MMA) terpolymer. Methylated collagen and terpolymer were deposited under conditions where they were oppositely charged to one another, thereby facilitating growth of the films through electrostatic interactions. Measurements revealed alternating positive and negative zeta-potential with the deposition of each methylated collagen and terpolymer layer, respectively. Assembly pH had a remarkable influence on zeta-potential of the assembled multilayers and the deposition of methylated collagen will be frustrated when the assembly pH is up to 9.0. In addition, ionic strength (NaCl concentration) showed an intricate effect on zeta-potential of the films of amphoteric methylated collagen.
authors.affiliation: Key Laboratory of Food Science of Ministry of Education, Department of Chemical Engineering, Nanchang University, Jiangxi, PR China. envjh@ncu.edu.cn
authors.forename: Jian-Hang
authors.initials: JH
authors.lastname: Zhu
authors.forename: Bao
authors.initials: B
authors.lastname: Zhang
authors.forename: Wei-Wei
authors.initials: WW
authors.lastname: Fang
authors.forename: Xue-Jun
authors.initials: XJ
authors.lastname: Lao
authors.forename: Hanry
authors.initials: H
authors.lastname: Yu
mesh_terms: D003094:Collagen / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008564:Membrane Potentials; D008567:Membranes, Artificial; D000432:Methanol / Q000737:chemistry; D055672:Static Electricity; D013499:Surface Properties; D023822:Tissue Engineering / Q000379:methods
chemical_list: D008567:Membranes, Artificial; D003094:Collagen; D000432:Methanol