| People | Locations | Statistics |
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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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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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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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Aguiar-Ricardo, Ana
Universidade Nova de Lisboa
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2020Cyclodextrin solubilization and complexation of antiretroviral drug lopinavir: In silico prediction; Effects of derivatization, molar ratio and preparation methodcitations
- 2018Preparation of ibuprofen/hydroxypropyl-Γ-cyclodextrin inclusion complexes using supercritical CO2-assisted spray dryingcitations
- 2017Supercritical CO2-assisted spray drying of strawberry-like gold-coated magnetite nanocomposites in chitosan powders for inhalationcitations
- 2017Bioactivity, mechanical properties and drug delivery ability of bioactive glass-ceramic scaffolds coated with a natural-derived polymercitations
- 2016Design of experiments approach on the preparation of dry inhaler chitosan composite formulations by supercritical CO2-assisted spray-dryingcitations
- 2015Design of oligoaziridine-PEG coatings for efficient nanogold cellular biotaggingcitations
- 2015POxylated Polyurea Dendrimerscitations
- 2014Polyurea dendrimer for efficient cytosolic siRNA deliverycitations
- 2014Development of dual-responsive chitosan-collagen scaffolds for pulsatile release of bioactive moleculescitations
- 2012Dual stimuli responsive poly(N-isopropylacrylamide) coated chitosan scaffolds for controlled release prepared from a non residue technologycitations
- 2012Biocompatible polyurea dendrimers with pH-dependent fluorescencecitations
- 2008Preparation of membranes with polysulfone/polycaprolactone blends using a high pressure cell specially designed for a CO2-assisted phase inversioncitations
- 2008Ultrasonic energy as a tool in the sample treatment for polymer characterization through matrix-assisted laser desorption ionization time-of-flight mass spectrometrycitations
- 2007Boron trifluoride catalyzed polymerisation of 2-substituted-2-oxazolines in supercritical carbon dioxidecitations
- 2006Visual and acoustic investigation of the critical behavior of mixtures of CO2 with a perfluorinated polyethercitations
Places of action
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article
Ultrasonic energy as a tool in the sample treatment for polymer characterization through matrix-assisted laser desorption ionization time-of-flight mass spectrometry
Abstract
Different ultrasonic devices including Ultrasonic bath with dual frequency, sonoreactor and ultrasonic probe, were tested for their viability in the sample treatment for polymer characterization by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis. The effect of sonication frequency (35 kHz, 40 kHz and 130 kHz), sonication amplitude, and sonication time on the polymer's number-average molecular weight (M(n)) and weight-average molecular weight (M(w)) were investigated. The effect of those variables in the molecular mass distribution of three polymer standards, poly(styrene) 2000 Da and 10,000 Da and poly(ethylene glycol) 1000 Da, was evaluated. In addition, the influence of ultrasonic energy oil the sample treatment as a function of the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI) matrix Was also Studied through two common standard matrices, dithranol and 2,5-dihydroxybenzoic acid. The results obtained show that the ultrasonic bath at 35 kHz is the best option for the purpose of fast sample treatment for polymer characterization. The M, and M. Values obtained for this ultrasonic device and for the three polymers tested using dithranol as MALDI matrix, were not statistically different from the ones acquired with vortex mixing and also were in Concordance with the Values recommended by the polymer manufacturers. (C) 2008 Elsevier B.V. All rights reserved.