title: Role of surfactants in the control of dopamine-eumelanin particle size and in the inhibition of film deposition at solid-liquid interfaces.
abstract: Anionic and cationic surfactants such as sodium dodecylsulfate (SDS) and hexadecyltrimethylammonium bromide (HTAB) are able to control the size of "polydopamine" particles produced from dopamine solutions and to simultaneously strongly inhibit the deposition of "polydopamine" on surfaces. Indeed, dynamic light scattering experiments allowed to show that the hydrodynamic radius of polydopamine progressively decreases from about 1 μm to a few nanometer upon an increase in the SDS and CTAB concentration. At the highest surfactant concentration used (50 mM) the size of the aggregates is only slightly larger than the size of the surfactant micelles. On the other hand, the non-ionic Triton X-100 surfactant has no significant influence on both phenomena. It is suggested that the observed effect originates from the anionic and cationic surfactants acting as a template in which the growth of "polydopamine" is confined.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche, 11 rue Humann, 67085 Strasbourg Cédex, France; Université de Strasbourg, Faculté de Chirurgie Dentaire, 8 rue Sainte Elizabeth, 67000 Strasbourg, France.
authors.forename: Florian
authors.initials: F
authors.lastname: Ponzio
authors.affiliation: NMR and Membrane Biophysics, CNRS, Unité Mixte de Recherche 7177, 8 Allée G. Monge, 67083 Strasbourg, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Bertani
authors.affiliation: Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche, 11 rue Humann, 67085 Strasbourg Cédex, France; Université de Strasbourg, Faculté de Chirurgie Dentaire, 8 rue Sainte Elizabeth, 67000 Strasbourg, France. Electronic address: vball@unistra.fr.
authors.forename: Vincent
authors.initials: V
authors.lastname: Ball
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D003902:Detergents / Q000737:chemistry*; D004298:Dopamine / Q000737:chemistry*; D008543:Melanins / Q000737:chemistry*; D008567:Membranes, Artificial; D008823:Micelles; D017830:Octoxynol / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry
chemical_list: D002593:Cetrimonium Compounds; D003902:Detergents; D008543:Melanins; D008567:Membranes, Artificial; D008823:Micelles; C041877:eumelanin; D012967:Sodium Dodecyl Sulfate; D017830:Octoxynol; D004298:Dopamine; D000077286:Cetrimonium
keywords: Dopamine–eumelanin; Surfactants; Templates