CaptiGel AB

Uppsala, Sweden

CaptiGel AB

Uppsala, Sweden
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Seisenbaeva G.A.,Swedish University of Agricultural Sciences | Seisenbaeva G.A.,CaptiGel AB | Daniel G.,Swedish University of Agricultural Sciences | Nedelec J.-M.,Institute of Chemistry of Clermont-Ferrand | And 3 more authors.
Nanoscale | Year: 2013

Formation of nanocrystalline and monodisperse TiO2 from a water soluble and stable precursor, ammonium oxo-lactato-titanate, (NH 4)8Ti4O4(Lactate) 8·4H2O, often referred to as TiBALDH or TALH, is demonstrated to be due to a coordination equilibrium. This compound, individual in the solid state, exists in solution in equilibrium with ammonium tris-lactato-titanate, (NH4)2Ti(Lactate)3 and uniform crystalline TiO2 nanoparticles (anatase) stabilized by surface-capping with lactate ligands. This equilibrium can be shifted towards nano-TiO2via application of a less polar solvent like methanol or ethanol, dilution of the solution, introduction of salts or raising the temperature, and reverted on addition of polar and strongly solvating media such as dimethyl sulfoxide, according to NMR. Aggregation and precipitation of the particles were followed by DLS and could be achieved by a decrease in their surface charge by adsorption of strongly hydrogen-bonding cations, e.g. in solutions of ammonia, ethanolamine or amino acid arginine or by addition of ethanol. The observed equilibrium may be involved in formation of nano-titania on the surface of plant roots exerting chelating organic carboxylate ligands and thus potentially influencing plant interactions. © The Royal Society of Chemistry 2013.

Galkina O.L.,Swedish University of Agricultural Sciences | Onneby K.,Swedish University of Agricultural Sciences | Huang P.,Uppsala University | Ivanov V.K.,Tomsk State University | And 5 more authors.
Journal of Materials Chemistry B | Year: 2015

Nanocomposite dermal drug delivery systems based on cellulose nanofibers with grafted titania nanoparticles loaded by two antibiotic medicines from different classes, i.e. tetracycline (TC) and phosphomycin (Phos), were successfully produced by a "green chemistry" approach in aqueous media. The influence of a different surface binding mechanism between the drug molecule and modified cellulose nanofibers on the release of the drug and, as a result, on antimicrobial properties against common pathogens Gram-positive, Staphylococcus aureus and Gram-negative Escherichia coli was investigated. The disk diffusion method and broth culture tests using varying concentrations of drugs loaded to nanocomposites were carried out to investigate the antibacterial effects. The influence of UV irradiation on the stability of the obtained nanocomposites and their antibacterial properties after irradiation were also investigated, showing enhanced stability especially for the TC loaded materials. These findings suggest that the obtained nanocomposites are promising materials for the development of potentially useful antimicrobial patches. © The Royal Society of Chemistry 2015.

Seisenbaeva G.A.,Swedish University of Agricultural Sciences | Seisenbaeva G.A.,CaptiGel AB | Kessler V.G.,Swedish University of Agricultural Sciences | Kessler V.G.,CaptiGel AB
Nanoscale | Year: 2014

This review provides an insight into the common reaction mechanisms in Soft Chemistry processes involved in nucleation, growth and aggregation of metal, metal oxide and chalcogenide nanoparticles starting from metal-organic precursors such as metal alkoxides, beta-diketonates, carboxylates and their chalcogene analogues and demonstrates how mastering the precursor chemistry permits us to control the chemical and phase composition, crystallinity, morphology, porosity and surface characteristics of produced nanomaterials. © The Royal Society of Chemistry 2014.

Kessler V.G.,Swedish University of Agricultural Sciences | Kessler V.G.,CaptiGel AB
Journal of Sol-Gel Science and Technology | Year: 2013

The review presents the industrial and laboratory synthesis, molecular structure and reactivity of tita-nium(IV) carboxylate complexes stable in aqueous medium. A special accent is made on the solution ligand-transfer equilibria that are able to provide uniform TiO2 nanoparticles under rather mild conditions starting from these easily commercially available species. Application of titanium oxide nanostructures derived from solution-generated titania nanoparticles is described in detail. © Springer Science+Business Media New York 2013.

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