Insights Into the Molecular Recognition Mechanism of 5-Hydroxy-Indol Acetic Acid by Imprinted Xero-Gel Materials

Dios, Alejandro Simón de; Fernández‐González, Alfonso; Badía‐Laiño, Rosana; Dı́az-Garcı́a, Marta Elena

doi:10.1166/sam.2013.1660

Cited by 1 publication

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“…In the visible region, as shown in figure 2(A) (b)-(c), cleaned MIP-SiO 2 -AgNWs and NIP-SiO 2 -AgNWs exhibited the typical AgNW absorption red-shifted bands when compared with raw AgNWs due to the presence of the silica shell. The major chemical groups in these materials were identified by the ATR-FTIR spectra (figure 2(B)) with peaks due to asymmetric stretching vibrations of Si-O-Si (siloxane) and Si-O, as an intense band between 1020 and 1060 cm −1 ; Si-OH stretching, as a broad shoulder at 952 cm −1 ; Si-O vibrations at 786 cm −1 ; symmetric Si-O-Si stretching with a broad band centered at 568 cm −1 ; adsorbed water with a broad band between 1633 and 3448 cm −1 and Si-OH hydroxyl stretching vibrations between 3700-3200 cm −1 [40][41][42]. No significant differences were observed between the bands present in the spectra of the imprinted and nonimprinted polymers, i.e.…”

Section: Characterization Of Trp-mip-sio 2 -Agnwsmentioning

confidence: 99%

Molecularly imprinted silica-silver nanowires for tryptophan recognition

Lopez¹,

Dı́az-Garcı́a²,

Badía‐Laiño³

2014

Nanotechnology

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We report on silver nanowires (AgNWs) coated with molecularly imprinted silica (MIP SiO2) for recognition of tryptophan (Trp). The use of AgNWs as a template confers an imprinted material with adequate mechanical strength and with a capability of recognizing Trp due to its nanomorphology when compared to spherical microparticles with a similar surface-to-volume ratio. Studies on adsorption isotherms showed the MIP-SiO2-AgNWs to exhibit homogeneous affinity sites with narrow affinity distribution. This suggests that the synthesized material behaves as a 1D nanomaterial with a large area and small thickness with very similar affinity sites. Trp release from MIP-SiO2-AgNWs was demonstrated to be dominated by the diffusion rate of Trp as controlled by the specific interactions with the imprinted silica shell. Considering these results and the lack of toxicity of silica sol-gel materials, the material offers potential in the field of drug or pharmaceutical controlled delivery, but also in optoelectronic devices, electrodes and sensors.

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Section: Characterization Of Trp-mip-sio 2 -Agnwsmentioning

confidence: 99%