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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Petrov, R. H. | Madrid |
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| Azam, Siraj |
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| Ali, M. A. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Niedziałkowski, Paweł
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Publications (7/7 displayed)
- 2020Efficient method for the concentration determination of Fmoc groups incorporated in the core-shell materials by Fmoc-glycinecitations
- 2020Electrochemical performance of thin free-standing boron-doped diamond nanosheet electrodescitations
- 2020Dansyl-labelled Ag@SiO2 core-shell nanostructures-synthesis, characterization, and metal-enhanced fluorescencecitations
- 2019Understanding the origin of high corrosion inhibition efficiency of bee products towards aluminium alloys in alkaline environmentscitations
- 2018Optical monitoring of electrochemical processes with ITO-based lossy-mode resonance optical fiber sensor applied as an electrodecitations
- 2018Optical detection of ketoprofen by its electropolymerization on an indium tin oxide-coated optical fiber probecitations
- 2017Characteristics of multiwalled carbon nanotubes-rhenium nanocomposites with varied rhenium mass fractions citations
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article
Efficient method for the concentration determination of Fmoc groups incorporated in the core-shell materials by Fmoc-glycine
Abstract
In this paper, we described the synthesis procedure of TiO2@SiO2 core-shell modified with 3-(aminopropyl)trimethoxysilane (APTMS). The chemical attachment of Fmoc–glycine (Fmoc–Gly–OH) at the surface of the core-shell structure was performed to determine the amount of active amino groups on the basis of the amount of Fmoc group calculation. We characterized nanostructures using various methods: transmission electron microscope (TEM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) to confirm the modification effectiveness. The ultraviolet-visible spectroscopy (UV-vis) measurement was adopted for the quantitative determination of amino groups present on the TiO2@SiO2 core-shell surface by determination of Fmoc substitution. The nanomaterials were functionalized by Fmoc–Gly–OH and then the fluorenylmethyloxycarbonyl (Fmoc) group was cleaved using 20% (v/v) solution of piperidine in DMF. This reaction led to the formation of a dibenzofulvene–piperidine adduct enabling the estimation of free Fmoc groups by measurement the maximum absorption at 289 and 301 nm using UV-vis spectroscopy. The calculations of Fmoc loading on core-shell materials was performed using different molar absorption coefficient: 5800 and 6089 dm3 × mol−1 × cm−1 for λ = 289 nm and both 7800 and 8021 dm3 × mol−1 × cm−1 for λ = 301 nm. The obtained results indicate that amount of Fmoc groups present on TiO2@SiO2–(CH2)3–NH2 was calculated at 6 to 9 µmol/g. Furthermore, all measurements were compared with Fmoc–Gly–OH used as the model sample.