@article{norton_tegnell_toporek_reichert_2005, title={In vitro characterization of vascular endothelial growth factor and dexamethasone releasing hydrogels for implantable probe coatings}, volume={26}, ISSN={["1878-5905"]}, DOI={10.1016/j.biomaterials.2004.07.069}, abstractNote={Anti-fouling hydrogel coatings, copolymers of 2-hydroxyethyl methacrylate, 1-vinyl-2-pyrrolidinone, and polyethylene glycol, were investigated for the purpose of improving biosensor biocompatibility. These coatings were modified to incorporate poly(lactide-co-glycolide) (PLGA) microspheres in order to release dexamethasone (DX) and/or vascular endothelial growth factor (VEGF). DX and VEGF release kinetics from microspheres, hydrogels, and microspheres embedded in hydrogels were determined in 2-week and 1-month studies. Overall, monolithic, non-degradable hydrogel drug release had an initial burst followed by release at a significantly lower amount. Microsphere drug release kinetics exhibited an initial burst followed by sustained release for 1 month. Embedding microspheres in hydrogels resulted in attenuated drug delivery. VEGF release from embedded microspheres, 1.1±0.3 ng, was negligible compared to release from hydrogels, 197±33 ng. After the initial burst from DX-loaded hydrogels, DX release from embedded microspheres was similar to that of hydrogels. The total DX release from hydrogels, 155±35 μg, was greater than that of embedded microspheres, 60±6 μg. From this study, hydrogel sensor coatings should be prepared incorporating VEGF in the hydrogel and DX either in the hydrogel or in DX microspheres embedded in the hydrogel.}, number={16}, journal={BIOMATERIALS}, author={Norton, LW and Tegnell, E and Toporek, SS and Reichert, WM}, year={2005}, month={Jun}, pages={3285–3297} }
 @article{truitt_toporek_rovira-hernandez_hatcher_white_2004, title={Identification of an adsorption complex between an alkane and zeolite active sites}, volume={126}, ISSN={["0002-7863"]}, DOI={10.1021/ja046729f}, abstractNote={Direct observation of the Bronsted acid site signal in an active zeolite catalyst following adsorption of stoichiometric quantities of isobutane reveals the presence of a specific adsorption complex. Independent polarization transfer experiments in which magnetization originates with either the catalyst or the adsorbed isobutane confirm this assignment. The initial steps in alkane reactivity are poorly defined, and this experimentally verified complex is proposed as a route to C-H bond activation in solid acids.}, number={36}, journal={JOURNAL OF THE AMERICAN CHEMICAL SOCIETY}, author={Truitt, MJ and Toporek, SS and Rovira-Hernandez, R and Hatcher, K and White, JL}, year={2004}, month={Sep}, pages={11144–11145} }