title: Porous polystyrene-block-poly(acrylic acid)/hemoglobin membrane formed by dually driven self-assembly and electrochemical application.
abstract: This study demonstrated a facile method to form a porous polymeric membrane, immobilizing a biocatalyst. A polyelectrolyte-based amphiphilic diblock copolymer, i.e., polystyrene-block-poly(acrylic acid) (PS-b-PAA), self-assembled with hemoglobin (Hb) dually driven by charge and amphiphilicity during solution-casting and evaporation. XPS and contact angle measurements suggested that the PS block enriched on the membrane surface. The PAA block pointed toward the internal membrane as well as ordered the Hb arrangement at the interface of the polymer and electrode. The obtained PS-b-PAA/Hb electrode showed a remarkably enhanced direct electron transfer (ET), which was revealed to be a surface-controlled process accompanied by single-proton transfer. The membrane was tested to catalyze the reduction of hydrogen peroxide, and exhibited an excellent reproducibility and stability. This method with a charge and amphiphilicity dually driven (CADD) self-assembly opened up a new way to construct a third-generation electrochemical biosensor.
authors.affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Xu
authors.affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
authors.forename: Zhengxi
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
authors.forename: Huaiguo
authors.initials: H
authors.lastname: Xue
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D006454:Hemoglobins / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D008567:Membranes, Artificial; D010100:Oxygen / Q000737:chemistry; D056951:Photoelectron Spectroscopy; D011137:Polystyrenes / Q000737:chemistry*; D016062:Porosity; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry
chemical_list: D000179:Acrylates; D006454:Hemoglobins; D008567:Membranes, Artificial; D011137:Polystyrenes; C509855:poly(styrene-b-acrylic acid); D014867:Water; D006861:Hydrogen Peroxide; D010100:Oxygen
keywords: amphiphilic diblock copolymer; direct electron transfer; dually driven self-assembly; electrocatalysis; porous membrane