title: A new approach for the immobilization of poly(acrylic) acid as a chemically reactive cross-linker on the surface of poly(lactic) acid-based biomaterials.
abstract: A new approach for the immobilization of poly(acrylic) acid (PAA) as a chemically reactive cross-linker on the surface of poly(lactic) acid-based (PLA) biomaterials is described. The proposed technique includes non-covalent attachment of a PAA layer to the surface of PLA-based biomaterial via biomaterial surface treatment with solvent/non-solvent mixture followed by the entrapment of PAA from its solution. Surface morphology and wettability of the obtained PLA-PAA composite materials were investigated by AFM and the sitting drop method respectively. The amount of the carboxyl groups on the composites surface was determined by using the fluorescent compounds (2-(5-aminobenzo[d]oxazol-2-yl)phenol (ABO) and its acyl derivative N-(2-(2-hydroxyphenyl)benzo[d]oxazol-5-yl)acetamide (AcABO)). It was shown that it is possible to obtain PLA-PAA composites with various surface relief and tunable wettability (57°, 62° and 66°). The capacity of the created PAA layer could be varied from 1.5nmol/cm2to 0.1μmol/cm2depending on the modification conditions. Additionally, using bovine serum albumin (BSA) it was demonstrated that such composites could be modified with proteins with high binding density (around 0.18nmol/cm2). Obtained fluoro-labeled PLA-PAA materials, as well as PLA-PAA composites themselves, are valuable since they can be used for biodegradable polymer implants tracking in living systems and as drug delivery systems.
authors.affiliation: Department of Biotechnology and Organic Chemistry, National Research Tomsk Polytechnic University, Russia; Department of Experimental Physics, National Research Tomsk Polytechnic University, Russia.
authors.forename: Ksenia S
authors.initials: KS
authors.lastname: Stankevich
authors.affiliation: Department of Biotechnology and Organic Chemistry, National Research Tomsk Polytechnic University, Russia; Department of Experimental Physics, National Research Tomsk Polytechnic University, Russia.
authors.forename: Nadezhda V
authors.initials: NV
authors.lastname: Danilenko
authors.affiliation: Siberian Physical-Technical Institute of Tomsk State University, Russia.
authors.forename: Ruslan M
authors.initials: RM
authors.lastname: Gadirov
authors.affiliation: Department of Biotechnology and Organic Chemistry, National Research Tomsk Polytechnic University, Russia.
authors.forename: Semen I
authors.initials: SI
authors.lastname: Goreninskii
authors.affiliation: Department of Experimental Physics, National Research Tomsk Polytechnic University, Russia. Electronic address: tverd@tpu.ru.
authors.forename: Sergei I
authors.initials: SI
authors.lastname: Tverdokhlebov
authors.affiliation: Department of Biotechnology and Organic Chemistry, National Research Tomsk Polytechnic University, Russia.
authors.forename: Victor D
authors.initials: VD
authors.lastname: Filimonov
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000818:Animals; D063566:Biodegradable Plastics / Q000737:chemistry*; D002417:Cattle; D016503:Drug Delivery Systems; D011091:Polyesters / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D063566:Biodegradable Plastics; D011091:Polyesters; D012710:Serum Albumin, Bovine; C033616:poly(lactide); C006903:carbopol 940
keywords: Bovine serum albumin; Composite materials; Entrapment; Fluorescent compounds; Poly(acrylic) acid; Poly(lactic) acid; Surface modification