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Design of enzyme-mediated controlled release systems based on silica mesoporous supports capped with ester-glycol groups

2012

[EN] An ethylene glycol-capped hybrid material for the controlled release of molecules in the presence of esterase enzyme has been prepared. The final organic-inorganic hybrid solid S1 was synthesized by a two-step procedure. In the first step, the pores of an inorganic MCM-41 support (in the form of nanoparticles) were loaded with [Ru(bipy) 3]Cl 2 complex, and then, in the second step, the pore outlets were functionalized with ester glycol moieties that acted as molecular caps. In the absence of an enzyme, release of the complex from aqueous suspensions of S1 at pH 8.0 is inhibited due to the steric hindrance imposed by the bulky ester glycol moieties. Upon addition of esterase enzyme, del…

Cell viabilityINGENIERIA DE LA CONSTRUCCIONEthyleneRuthenium complexesMCM-41 supportsCytotoxicityGlycol derivativesEsteraseFunctionalizedOrganic-inorganic hybrid solidsGlycolschemistry.chemical_compoundQUIMICA ORGANICATumor Cells CulturedElectrochemistryControlled release systemsOrganic chemistryControlled releaseGeneral Materials ScienceSteric hindrancesMCF-7 cellsSpectroscopyHydrolysisEsterasesSilicaEstersSurfaces and InterfacesSilicon DioxideCondensed Matter PhysicsControlled releaseChlorine compoundsEster bondsBody fluidsHybrid materialsHybrid materialPorosityCell deathCell SurvivalSurface PropertiesCytotoxic drugsRutheniumHydrolysisEnzymatic hydrolysisEsterase enzymesPolymer chemistryHumansCamptothecin (CPT)Molecular capSize reductionsTherapeutic ApplicationEthylene glycolTwo-step procedureEsterificationSuspensions (fluids)Ruthenium compoundsQUIMICA INORGANICAMesoporous supportOligo(ethylene glycol)Cell internalizationMolecular gatesConfocal microscopychemistryEnzymatic hydrolysisEnzyme-mediated hydrolysisNanoparticlesCamptothecinCell cultureMesoporous materialAqueous suspensionsEthylene glycolHeLa Cells
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