title: Physisorption of α-chymotrypsin on SiO2 and TiO2: A comparative study via experiments and molecular dynamics simulations.
abstract: In order to understand fundamental interactions at the interface between immobilized enzymes and ceramic supports, the authors compare the adsorption features of chymotrypsin on SiO2 and TiO2 colloidal particles by means of a combination of adsorption experiments and molecular dynamics simulations. While the dependency of the adsorption amount on pH is consistent with the trend predicted the Derjaguin-Landau-Verwey-Overbeek theory, other effects can only be rationalized if the atomic-scale details of the water-mediated protein-surface interactions are considered. On both surfaces, a clear driving force for the formation of a double monolayer at the saturation coverage is found. Although nearly equal free energies of adsorption are estimated on the two materials via a Langmuir adsorption analysis, about 50% more proteins per unit of surface can be accommodated on TiO2 than on SiO2. This is probably due to the lower surface diffusion mobility of the adsorbed protein in the latter case. Surface anchoring is realized by a combination of direct ionic interactions between charged proteins and surface sites (more pronounced for SiO2) and distinct structuring of the surface hydration layers in which the contact residues are embedded (more pronounced for TiO2). Finally, normalization of the data with respect to particle surface areas accessible to the proteins, rather than determined by means of the Brunauer-Emmett-Teller nitrogen adsorption isotherm, is crucial for a correct interpretation of the results.
authors: Advanced Ceramics, Faculty of Production Engineering, University of Bremen, Am Biologischen Garten 2, Bremen 28359, Germany.
authors: Ludmilla
authors: L
authors: Derr
authors: Hybrid Materials Interfaces Group, Faculty of Production Engineering and Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, Bremen 28359, Germany and MAPEX Center for Materials and Processes, University of Bremen, Bremen 28359, Germany.
authors: Nils
authors: N
authors: Hildebrand
authors: Hybrid Materials Interfaces Group, Faculty of Production Engineering and Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, Bremen 28359, Germany and MAPEX Center for Materials and Processes, University of Bremen, Bremen 28359, Germany.
authors: Susan
authors: S
authors: Köppen
authors: Hybrid Materials Interfaces Group, Faculty of Production Engineering and Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, Bremen 28359, Germany and MAPEX Center for Materials and Processes, University of Bremen, Bremen 28359, Germany.
authors: Simon
authors: S
authors: Kunze
authors: Advanced Ceramics, Faculty of Production Engineering, University of Bremen, Am Biologischen Garten 2, Bremen 28359, Germany.
authors: Laura
authors: L
authors: Treccani
authors: Center for Environmental Research and Sustainable Technology, University of Bremen, Leobenerstraße NW2, Bremen 28359, Germany and Center for Biomolecular Interactions Bremen, University of Bremen, Leobenerstraße NW2, Bremen 28359, Germany.
authors: Ralf
authors: R
authors: Dringen
authors: Advanced Ceramics, Faculty of Production Engineering, University of Bremen, Am Biologischen Garten 2, Bremen 28359, Germany and MAPEX Center for Materials and Processes, University of Bremen, Bremen 28359, Germany.
authors: Kurosch
authors: K
authors: Rezwan
authors: Hybrid Materials Interfaces Group, Faculty of Production Engineering and Bremen Center for Computational Materials Science, University of Bremen, Am Fallturm 1, Bremen 28359, Germany; Center for Environmental Research and Sustainable Technology, University of Bremen, Leobenerstraße NW2, Bremen 28359, Germany; and MAPEX Center for Materials and Processes, University of Bremen, Bremen 28359, Germany.
authors: Lucio
authors: L
authors: Colombi Ciacchi
mesh_terms: D000327:Adsorption; D055598:Chemical Phenomena; D002918:Chymotrypsin / Q000737:chemistry*; D004800:Enzymes, Immobilized / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D056004:Molecular Dynamics Simulation; D012822:Silicon Dioxide / Q000737:chemistry*; D055672:Static Electricity; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D004800:Enzymes, Immobilized; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium; D002918:Chymotrypsin; C117608:alpha-chymotrypsin