title: Dual mode bioreactions on polymer nanoparticles covered with phosphorylcholine group.
abstract: We investigated the preparation of polymer nanoparticles covered with phosphorylcholine (PC) groups and the immobilization of proteins in order to observe dual mode bioreactions on the nanoparticles. For the surface modification on the nanoparticles, a water-soluble amphiphilic phospholipid polymer with PC groups as a hydrophilic moiety was synthesized. In this polymer, an active ester group, which can immobilize proteins, was introduced. Using the phospholipid polymer as a solubilizer, poly(L-lactic acid) nanoparticles were prepared from its methylene chloride solution in an aqueous medium by the solvent evaporation method. The diameter of the nanoparticles was ca. 200 nm and the surface was covered with the PC groups and active ester groups. Proteins could immobilize on the nanoparticles under mild conditions by the reaction between the active ester group and amino group in the proteins. Both an antibody and enzyme were immobilized on the nanoparticles and bioreactions such as the antigen/antibody reaction and enzymatic reaction were observed. When an antigen was added to the suspension of the nanoparticles, aggregation of the nanoparticles occurred and then they precipitated. Also, the enzymatic reaction proceeded well when the enzyme substrate was added to the suspension. Based on these results, we provided polymer nanoparticles functionalized with both the antibody and enzyme, and the dual mode bioreactions could occur. We concluded that the novel polymer nanoparticles could be used for nano-/micro-scaled diagnostic and medical treatment systems.
authors.affiliation: Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-8656, Japan.
authors.forename: Tomomi
authors.initials: T
authors.lastname: Ito
authors.forename: Junji
authors.initials: J
authors.lastname: Watanabe
authors.forename: Madoka
authors.initials: M
authors.lastname: Takai
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Konno
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Iwasaki
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Ishihara
mesh_terms: D000911:Antibodies, Monoclonal / Q000737:chemistry; D019149:Bioreactors; D005455:Fluorescent Antibody Technique; D019344:Lactic Acid / Q000737:chemistry*; D008689:Methacrylates / Q000138:chemical synthesis / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D010767:Phosphorylcholine / Q000737:chemistry*; D011091:Polyesters; D011092:Polyethylene Glycols / Q000138:chemical synthesis / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000911:Antibodies, Monoclonal; D008689:Methacrylates; D011091:Polyesters; D011108:Polymers; C513779:poly(2-methacryloyloxyethyl phosphorylcholine-co-n-butyl methacrylate-co-p-nitrophenyloxycarbonyl polyethyleneglycol methacrylate); D010767:Phosphorylcholine; D019344:Lactic Acid; D011092:Polyethylene Glycols; C033616:poly(lactide)