title: Mesoporous silicas with tunable morphology for the immobilization of laccase.
abstract: Siliceous ordered mesoporous materials (OMM) are gaining interest as supports for enzyme immobilization due to their uniform pore size, large surface area, tunable pore network and the introduction of organic components to mesoporous structure. We used SBA-15 type silica materials, which exhibit a regular 2D hexagonal packing of cylindrical mesopores of uniform size, for non-covalent immobilization of laccase. Synthesis conditions were adjusted in order to obtain supports with different particle shape, where those with shorter channels had higher loading capacity. Despite the similar isoelectric points of silica and laccase and the close match between the size of laccase and the pore dimensions of these SBA-15 materials, immobilization was achieved with very low leaching. Surface modification of macro-/mesoporous amorphous silica by grafting of amine moieties was proved to significantly increase the isoelectric point of this support and improve the immobilization yield.
authors.affiliation: Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie 2, Madrid 28049, Spain.
authors.forename: Victoria
authors.initials: V
authors.lastname: Gascón
authors.affiliation: Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie 2, Madrid 28049, Spain.
authors.forename: Isabel
authors.initials: I
authors.lastname: Díaz
authors.affiliation: Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie 2, Madrid 28049, Spain.
authors.forename: Carlos
authors.initials: C
authors.lastname: Márquez-Álvarez
authors.affiliation: Instituto de Catálisis y Petroleoquímica, CSIC, Marie Curie 2, Madrid 28049, Spain. rmblanco@icp.csic.es.
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Blanco
mesh_terms: D004800:Enzymes, Immobilized / Q000737:chemistry*; D042845:Laccase / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D004800:Enzymes, Immobilized; C509969:SBA-15; D012822:Silicon Dioxide; D042845:Laccase