title: Affinity adhesion of carbohydrate particles and yeast cells to boronate-containing polymer brushes grafted onto siliceous supports.
abstract: Cross-linked agarose particles (Sepharose CL-6B) and baker's yeast cells were found to adhere to siliceous supports end-grafted with boronate-containing copolymers (BCCs) of N,N-dimethylacrylamide at pH> or =7.5, due to boronate interactions with surface carbohydrates of the particles and the cells. These interactions were registered both on macroscopic and on molecular levels: the BCCs spontaneously adsorbed on the agarose gel at pH> or =7.5, with adsorption increasing with pH. Agarose particles and yeast cells stained with Procion Red HE-3B formed stable, monolayer-like structures at pH 8.0, whereas at pH 7.0-7.8 the structures on the copolymer-grafted supports were less stable and more random. At pH 9.0, 50 % saturation of the surface with adhering cells was attained in 2 min. Stained cells formed denser and more stable layers on the copolymer-grafted supports than they did on supports modified with self-assembled organosilane layers derivatized with low-molecular-weight boronate, presumably due to a higher reactivity of the grafted BCCs. Quantitative detachment of adhered particles and cells could be achieved by addition of 20 mM fructose--a strong competitor for binding to boronates--at pH 7.0-9.0. Regeneration of the grafted supports allowed several sequential adhesion and detachment cycles with stained yeast cells. Affinity adhesion of micron-sized carbohydrate particles to boronate-containing polymer brushes fixed on solid supports is discussed as a possible model system suggesting a new approach to isolation and separation of living cells.
authors.affiliation: Department of Biotechnology Center for Chemistry and Chemical Engineering Lund University, P.O. Box 124, 22100 Lund, Sweden. alexander.ivanov@biotek.lu.se
authors.forename: Alexander E
authors.initials: AE
authors.lastname: Ivanov
authors.forename: Homayon Ahmad
authors.initials: HA
authors.lastname: Panahi
authors.forename: Marina V
authors.initials: MV
authors.lastname: Kuzimenkova
authors.forename: Lars
authors.initials: L
authors.lastname: Nilsson
authors.forename: Björn
authors.initials: B
authors.lastname: Bergenståhl
authors.forename: Husain S
authors.initials: HS
authors.lastname: Waqif
authors.forename: Mohsen
authors.initials: M
authors.lastname: Jahanshahi
authors.forename: Igor Yu
authors.initials: IY
authors.lastname: Galaev
authors.forename: Bo
authors.initials: B
authors.lastname: Mattiasson
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D001897:Boronic Acids / Q000737:chemistry*; D002241:Carbohydrates / Q000737:chemistry*; D002448:Cell Adhesion; D005898:Glass; D006863:Hydrogen-Ion Concentration; D009994:Osmolar Concentration; D011108:Polymers / Q000737:chemistry*; D012441:Saccharomyces cerevisiae / Q000166:cytology*; D012685:Sepharose / Q000031:analogs & derivatives / Q000737:chemistry; D012821:Silanes / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000178:Acrylamides; D001897:Boronic Acids; D002241:Carbohydrates; D011108:Polymers; D012821:Silanes; C028592:3-aminobenzeneboronic acid; C047264:sepharose CL 6B; D012685:Sepharose; C099046:N,N-dimethylacrylamide