Sol–gel silica modified with phosphate and sulfate ions

Manríquez, Ma.; López, Tomás; Gómez, Roberto; Picquart, M.; Hernández-Cortéz, J.G.

doi:10.1016/j.jnoncrysol.2004.08.115

Cited by 19 publications

(7 citation statements)

References 11 publications

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“…This catalytic effect of phosphorous and more particularly phosphate ions has already been observed in a previous study [35] where silica was modified by phosphate ions. In this work, it was shown that phosphated silica exhibits a high density of Lewis and Brö nsted acid sites due to the incorporation of phosphate ions.…”

Section: Catalytic Effect Of the Phosphonate Functionsupporting

confidence: 81%

Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect

Nieuwenhuyse

Bounor‐Legaré

Boisson

et al. 2008

Journal of Non-Crystalline Solids

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Section: Catalytic Effect Of the Phosphonate Functionsupporting

confidence: 81%

Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect

Nieuwenhuyse

Bounor‐Legaré

Boisson

et al. 2008

Journal of Non-Crystalline Solids

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“…The small bands at 947 cm −1 and 802 cm −1 are assigned to the flexion modes of SiO-H and Si-O-, respectively [29]. Fresh catalysts display analogous IR features but the most intense band became wider due to the overlay of O-P-O and O=P-O vibrations at 1140 and 1230 cm −1 [30]. For the post-reaction samples, the most intense band results from the overlapping of features belonging to SiO 2 and PO 4 3− species; for samples prepared using diammonium phosphate this effect was more noticeable.…”

Section: Resultsmentioning

confidence: 98%

Biodiesel Glycerin Valorization into Oxygenated Fuel Additives

et al. 2021

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Current industrial methods of biodiesel production lead to an excess of crude glycerin which requires costly purification before commercialization. Production of oxygenated fuel additives is a potential route for glycerin valorization. Glycerin acetylation was carried out over heterogeneous acid catalysts (15%, glycerol weight basis) using glacial acetic acid (molar ratio = 9). The catalysts, containing different amounts of phosphate species (P/Si from 10 to 20 atomic ratio), were prepared by wet impregnation of commercial silica with aqueous solutions of diammonium phosphate and ortho-phosphoric acid. X-ray diffraction patterns of calcined solids presented amorphous patterns like raw silica. The prepared catalysts presented, at 120 °C, glycerol conversion higher than 89.5% after 1 h of reaction, been diacetin the major product, with triacetin selectivities lower than 26.1%. Diacetin selectivity was found to be almost invariant with catalyst acidity thus underlining the relevance of catalyst porosity due to the large acetins molecules sizes. The slow rate of triacetin diffusion in narrow pores of catalyst might be responsible for the relatively low yield obtained. Surface phosphate species showed a slow rate of leaching in the reaction medium showing high catalyst stability.

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“…Bionanocatalysts have drawn research teams from all around the world in recent years. These nanomedicines are endowed with inherent biochemical features of significant importance in clinical applications, such as biocompatibility and selectivity, thanks to their surface coating [51]. Bionanocatalysts can be engineered to be innocuous to healthy cells while exerting specific cytotoxicity against pathogenic organisms or damaged cells, making them very well-suited for use in disinfection and cancer treatments.…”

Section: Bionanocatalystsmentioning

confidence: 99%

Catalytic Nanomedicine as a Therapeutic Approach to Brain Tumors: Main Hypotheses for Mechanisms of Action

López-Goerne

Padilla-Godínez

2023

Nanomaterials

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Glioblastoma multiforme (GBM) is the most aggressive primary malignant tumor of the brain. Although there are currently a wide variety of therapeutic approaches focused on tumor elimination, such as radiotherapy, chemotherapy, and tumor field therapy, among others, the main approach involves surgery to remove the GBM. However, since tumor growth occurs in normal brain tissue, complete removal is impossible, and patients end up requiring additional treatments after surgery. In this line, Catalytic Nanomedicine has achieved important advances in developing bionanocatalysts, brain-tissue-biocompatible catalytic nanostructures capable of destabilizing the genetic material of malignant cells, causing their apoptosis. Previous work has demonstrated the efficacy of bionanocatalysts and their selectivity for cancer cells without affecting surrounding healthy tissue cells. The present review provides a detailed description of these nanoparticles and their potential mechanisms of action as antineoplastic agents, covering the most recent research and hypotheses from their incorporation into the tumor bed, internalization via endocytosis, specific chemotaxis by mitochondrial and nuclear genetic material, and activation of programmed cell death. In addition, a case report of a patient with GBM treated with the bionanocatalysts following tumor removal surgery is described. Finally, the gaps in knowledge that must be bridged before the clinical translation of these compounds with such a promising future are detailed.

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Sol–gel silica modified with phosphate and sulfate ions

Cited by 19 publications

References 11 publications

Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect

Hydrolysis–condensation reactions of diethylphosphato-ethyltriethoxysilane with tetraethoxysilane studied by 29Si-NMR: Solvent and phosphonate catalytic effect

Biodiesel Glycerin Valorization into Oxygenated Fuel Additives

Catalytic Nanomedicine as a Therapeutic Approach to Brain Tumors: Main Hypotheses for Mechanisms of Action

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