Microcontainers with Fluorescent Anisotropic Zeolite L Cores and Isotropic Silica Shells

Guerrero‐Martínez, Andrés; Fibikar, Sandra; Pastoriza‐Santos, Isabel; Liz‐Marzán, Luis M.; Cola, Luisa De

doi:10.1002/ange.200804167

Cited by 12 publications

(13 citation statements)

References 38 publications

(24 reference statements)

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“…The speed at which they can enter or exit much depends on the structure of the guests [37,79,81] and the environment. [111] Leakage can be quantitatively avoided by closing the channels by means of stopcocks, [42] which may be followed by addition of a silica shell, [60,112] if desired. Different ways to do this have recently been reviewed.…”

Section: Discussionmentioning

confidence: 99%

Designing Dye–Nanochannel Antenna Hybrid Materials for Light Harvesting, Transport and Trapping

et al. 2011

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We discuss artificial photonic antenna systems that are built by incorporating chromophores into one-dimensional nanochannel materials and by organizing the latter in specific ways. Zeolite L (ZL) is an excellent host for the supramolecular organization of different kinds of molecules and complexes. The range of possibilities for filling its one-dimensional channels with suitable guests has been shown to be much larger than one might expect. Geometrical constraints imposed by the host structure lead to supramolecular organization of the guests in the channels. The arrangement of dyes inside the ZL channels is what we call the first stage of organization. It allows light harvesting within the volume of a dye-loaded ZL crystal and also the radiationless transport of energy to either the channel ends or center. One-dimensional FRET transport can be realized in these guest-host materials. The second stage of organization is realized by coupling either an external acceptor or donor stopcock fluorophore at the ends of the ZL channels, which can then trap or inject electronic excitation energy. The third stage of organization is obtained by interfacing the material to an external device via a stopcock intermediate. A possibility to achieve higher levels of organization is by controlled assembly of the host into ordered structures and preparation of monodirectional materials. The usually strong light scattering of ZL can be suppressed by refractive-index matching and avoidance of microphase separation in hybrid polymer/dye-ZL materials. The concepts are illustrated and discussed in detail on a bidirectional dye antenna system. Experimental results of two materials with a donor-to-acceptor ratio of 33:1 and 52:1, respectively, and a three-dye system illustrate the validity and challenges of this approach for synthesizing dye-nanochannel hybrid materials for light harvesting, transport, and trapping.

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Section: Discussionmentioning

confidence: 99%

Designing Dye–Nanochannel Antenna Hybrid Materials for Light Harvesting, Transport and Trapping

et al. 2011

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“…Synthesis of N,N′-bis(2,6-dimethylphenyl) perylene 3,4,9,10-tetracarboxylic diimide, aminated zeolites and bifunctional zeolites Zeolites equipped with the green fluorescent emitter N,N′-bis (2,6-dimethylphenyl) perylene 3,4,9,10-tetracarboxylic diimide and amino groups were synthesized following previously published procedures (Strassert et al 2008;Guerrero-Martinez et al 2009). Deaminated heparin (5 mg) was added to 1 mL of amino-zeolite in water.…”

Section: Methodsmentioning

confidence: 99%

Toxoplasma gondii secretory proteins bind to sulfated heparin structures

Azzouz¹,

Kamena²,

Laurino³

et al. 2012

Glycobiology

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Toxoplasma gondii is the causative agent of toxoplasmosis, one of the most widespread infections in humans and animals, and is a major opportunistic pathogen in immunocompromised patients. Toxoplasma gondii is unique as it can invade virtually any nucleated cell, although the mechanisms are not completely understood. Parasite attachment to the host cell is a prerequisite for reorientation and penetration and likely requires the recognition of molecules at the host cell surface. It has been reported that the affinity of tachyzoites, the invasive form of T. gondii, for host cells can be inhibited by a variety of soluble-sulfated glycosaminoglycans (GAGs), such as heparan sulfate. Using heparin-functionalized zeolites in the absence of host cells, we visualized heparin-binding sites on the surface of tachyzoites by confocal and atomic force microscopy. Furthermore, we report that protein components of the parasite rhoptry, dense granule and surface bind GAGs. In particular, the proteins ROP2 and ROP4 from the rhoptry, GRA2 from the dense granules and the surface protein SAG1 were found to bind heparin. The binding specificities and affinities of individual parasite proteins for natural heparin and heparin oligosaccharides were determined by a combination of heparin oligosaccharide microarrays and surface plasmon resonance. Our results suggest that interactions between sulfated GAGs and parasite surface antigens contribute to T. gondii attachment to host cell surfaces as well as initiating the invasion process, while rhoptries and dense granule organelles may play an important role during the establishment of the infection and during the life of the parasite inside the parasitophorous vacuole.

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“…[125] Porous materials thus offer the potential to be used as microcontainers, and applications which has also been demonstrated for another highly porous material, zeolites. [126] For zeolites, however, only few studies have reported on a successful direct deposition on surfaces, but the deposition of monolayers of zeolite-platelets on appropriately functionalized substrates by m-contact printing has been demonstrated. [127] 8.…”

Section: Functionalization Of Surfaces By Deposition Of Porous Thin Fmentioning

confidence: 99%

Interfacial Systems Chemistry: Out of the Vacuum—Through the Liquid—Into the Cell

Wöll

2010

ChemPhysChem

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Microcontainers with Fluorescent Anisotropic Zeolite L Cores and Isotropic Silica Shells

Cited by 12 publications

References 38 publications

Designing Dye–Nanochannel Antenna Hybrid Materials for Light Harvesting, Transport and Trapping

Designing Dye–Nanochannel Antenna Hybrid Materials for Light Harvesting, Transport and Trapping

Toxoplasma gondii secretory proteins bind to sulfated heparin structures

Interfacial Systems Chemistry: Out of the Vacuum—Through the Liquid—Into the Cell

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