title: Self-Propelled Soft Protein Microtubes with a Pt Nanoparticle Interior Surface.
abstract: Human serum albumin (HSA) microtubes with an interior surface composed of Pt nanoparticles (PtNPs) are self-propelled in aqueous H2O2medium. They can capture cyanine dye and Escherichia coli (E. coli) efficiently. Microtubes were prepared by wet templating synthesis by using a track-etched polycarbonate (PC) membrane with alternate filtrations of aqueous HSA, poly-l-arginine (PLA), and citrate-PtNPs. Subsequent dissolution of the PC template yielded uniform hollow cylinders made of (PLA/HSA)8PLA/PtNP stacking layers (1.16±0.02 μm outer diameter, ca. 23 μm length). In aqueous H2O2media, the soft protein microtubes are self-propelled by jetting O2bubbles from the open-end terminus. The effects of H2O2and surfactant concentrations on the velocity were investigated. The swimming microtube captured cyanine dye in the HSA component of the wall. Addition of an intermediate γ-Fe3O4layer allowed manipulation of the direction of movement of the tubule by using a magnetic field. Because the exterior surface is positively charged, the bubble-propelled microtubes adsorbed E. coli with high efficiency. The removal ratio of E. coli by a single treatment reached 99 %.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kobayakawa
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Yoko
authors.initials: Y
authors.lastname: Nakai
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Motofusa
authors.identifier: http://orcid.org/0000-0001-6772-0027
authors.initials: M
authors.lastname: Akiyama
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Teruyuki
authors.identifier: http://orcid.org/0000-0002-7622-3433
authors.initials: T
authors.lastname: Komatsu
mesh_terms: D001120:Arginine / Q000737:chemistry*; D004926:Escherichia coli; D006801:Humans; D053758:Nanoparticles / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D011076:Polycarboxylate Cement / Q000737:chemistry*; D012709:Serum Albumin / Q000737:chemistry*
chemical_list: D011076:Polycarboxylate Cement; D012709:Serum Albumin; C005506:polycarbonate; D010984:Platinum; D001120:Arginine
keywords: bacteria; human serum albumin; layered compound; proteins; template synthesis