Search results for: Miguel Valcárcel

Items from 1 to 20 out of 152 results

article

Ionic-liquid-based microextraction method for the determination of silver nanoparticles in consumer products

M. Laura Soriano, Celia Ruiz-Palomero, Miguel Valcárcel

Analytical and Bioanalytical Chemistry > 2019 > 411 > 20 > 5023-5031

A simple method to determine hazardous silver nanoparticles (AgNPs) based on ionic liquid (IL) dispersive liquid–liquid microextraction and back-extraction is described. This approach involves AgNP stabilization using a cationic surfactant followed by extraction from the sample matrix by means of an IL as an extraction phase. Certain ILs have high affinity for metals, and preliminary experiments showed...

article

Cyclodextrin-modified nanodiamond for the sensitive fluorometric determination of doxorubicin in urine based on its differential affinity towards β/γ-cyclodextrins

M. Laura Soriano, Carolina Carrillo-Carrion, Celia Ruiz-Palomero, Miguel Valcárcel

Microchimica Acta > 2018 > 185 > 2 > 1-8

The manuscript reports on the preparation of β-cyclodextrin-modified nanodiamonds (βCD-ND) for the extraction and preconcentration of the fluorescent anticancer drug doxorubicin (DOX) from biological samples. The inclusion of DOX into the cavities of β- and γ-cyclodextrin (CD) confirms their utility for selective extraction and elution of the drug based on its good fit to the cyclodextrin cavity....

article

Analytical Nanoscience and Nanotechnology: Where we are and where we are heading

María Laura Soriano, Mohammed Zougagh, Miguel Valcárcel, Ángel Ríos

Talanta > 2018 > 177 > C > 104-121

The main aim of this paper is to offer an objective and critical overview of the situation and trends in Analytical Nanoscience and Nanotechnology (AN&N), which is an important break point in the evolution of Analytical Chemistry in the XXI century as they were computers and instruments in the second half of XX century. The first part of this overview is devoted to provide a general approach to...

article

Fluorescent nanocellulosic hydrogels based on graphene quantum dots for sensing laccase

Celia Ruiz-Palomero, Sandra Benítez-Martínez, M. Laura Soriano, Miguel Valcárcel

Analytica Chimica Acta > 2017 > 974 > C > 93-99

A novel low-cost fluorimetric platform based on sulfur, nitrogen-codoped graphene quantum dots immersed into nanocellulosic hydrogels is designed and applied in detecting the laccase enzyme. Although most of methods for detecting laccase are based on their catalytic activity, which is strongly dependent on environmental parameters, we report a sensitive and selective method based on the fluorescence...

article

Photoluminescent sensing hydrogel platform based on the combination of nanocellulose and S,N-codoped graphene quantum dots

Celia Ruiz-Palomero, M. Laura Soriano, Sandra Benítez-Martínez, Miguel Valcárcel

Sensors and Actuators B: Chemical > 2017 > 245 > C > 946-953

The design of tailor-made gelators has attracted tremendous level of attention for the fabrication of novel nanogels with responsive characteristics. Exploiting the gel properties of nanocellulose (NC) because of its abundance, sustainability and renewability, we reported the fabrication of a fluorescent hydrogel based on S,N-codoped Graphene Quantum Dots (S,N-GQDs) acting as luminophore and sensitizer...

article

Integrated sampling and analysis unit for the determination of sexual pheromones in environmental air using fabric phase sorptive extraction and headspace-gas chromatography–mass spectrometry

M.Carmen Alcudia-León, Rafael Lucena, Soledad Cárdenas, Miguel Valcárcel, more

Journal of Chromatography A > 2017 > 1488 > C > 17-25

This article presents a novel unit that integrates for the first time air sampling and preconcentration based on the use of fabric phase sorptive extraction principles. The determination of Tuta absoluta sexual pheromone traces in environmental air has been selected as analytical problem. For this aim, a novel laboratory-built unit made up of commercial brass elements as holder of the sol-gel coated...

article

Detection of nanocellulose in commercial products and its size characterization using asymmetric flow field-flow fractionation

Celia Ruiz-Palomero, M. Laura Soriano, Miguel Valcárcel

Microchimica Acta > 2017 > 184 > 4 > 1069-1076

The paper reports on a method for the detection of nanocellulose (NC) in consumer products by making use of a combination of (a) liquid-liquid extraction with an ionic liquid, and (b) size characterization by asymmetric flow field-flow fractionation (AF4) coupled to multi-angle light scattering (MALS) and refractive index (RI) detection. Both AF4 and MALS are viable tools for characterizing the size...

article

Nanocellulose as analyte and analytical tool: Opportunities and challenges

Celia Ruiz-Palomero, M. Laura Soriano, Miguel Valcárcel

TrAC Trends in Analytical Chemistry > 2017 > 87 > C > 1-18

In the run-up to Nanoscience and Nanotechnology (N&N), researchers have investigated and applied a wide variety of nanomaterials (e.g. from carbon nanotubes to graphene) with spectacular properties that overwhelmed the conventional materials. Far from most of nanoparticles (NPs) studied since the last decade like graphene, nanocellulose (NC) has been recently considered as one of the renewable...

article

Analytical methodologies for nanotoxicity assessment

Encarnación Caballero-Díaz, Miguel Valcárcel Cases

TrAC Trends in Analytical Chemistry > 2016 > 84 > PA > 160-171

Comprehensive research on toxicological effects of nanoparticles is of vital importance owing to their increasing manufacturing and use. This review outlines critical aspects in nanotoxicity assessment, from the primordial characterization of physicochemical properties of nanoparticles, to the most important analytical strategies/techniques for elucidating their biological behaviour at cellular and...

article

Recent advances and trends in analytical nanoscience and nanotechnology

Miguel Valcárcel, Ángela I. López-Lorente

TrAC Trends in Analytical Chemistry > 2016 > 84 > PA > 1-2

article

Preparation and evaluation of micro and meso porous silica monoliths with embedded carbon nanoparticles for the extraction of non-polar compounds from waters

Beatriz Fresco-Cala, Soledad Cárdenas, Miguel Valcárcel

Journal of Chromatography A > 2016 > 1468 > C > 55-63

A novel hybrid micro and meso porous silica monolith with embedded carbon nanoparticles (Si-CNPs monolith) was prepared inside a fused silica capillary (3cm in length) and used as a sorbent for solid-phase microextraction. The hybrid monolithic capillary was synthetized by hydrolysis and polycondensation of a mixture of tetraethoxysilane (TEOS), ethanol, and three different carbon nanoparticles such...

article

Magnetic nanoparticles coated with ionic liquid for the extraction of endocrine disrupting compounds from waters

Francisco Antonio Casado-Carmona, María del Carmen Alcudia-León, Rafael Lucena, Soledad Cárdenas, more

Microchemical Journal > 2016 > 128 > C > 347-353

A hybrid nanomaterial was synthesized to be used in dispersive solid phase microextraction. It consist of a magnetic core (Fe₃O₄), obtained by coprecipitation covered by a silica (SiO₂) layer were the ionic liquid methylimidazolium hexafluorophosphate (MIM-PF₆) was attached. The Fe₃O₄@SiO₂@MIM-PF₆ nanoparticles have been characterized by microscopy and X-ray diffraction. The chemical composition of...

article

Selective extraction of Bactrocera oleae sexual pheromone from olive oil by dispersive magnetic microsolid phase extraction using a molecularly imprinted nanocomposite

María del Carmen Alcudia-León, Rafael Lucena, Soledad Cárdenas, Miguel Valcárcel

Journal of Chromatography A > 2016 > 1455 > C > 57-64

Bactrocera oleae Gmelin, also known as olive fruit fly, is the main olive tree pest. It produces a severe effect not only on the productivity but also on the quality of the olive-related products. In fact, the oil obtained from infected olives has a lower antioxidant power. In addition, an increase of the oil acidity, peroxide index and UV-absorbance can also be observed. 1,7-dioxaspiro-[5,5]-undecane...

article

Gels based on nanocellulose with photosensitive ruthenium bipyridine moieties as sensors for silver nanoparticles in real samples

Celia Ruiz-Palomero, M. Laura Soriano, Miguel Valcárcel

Sensors and Actuators B: Chemical > 2016 > 229 > C > 31-37

Novel highly luminescent gels based on carboxylated nanocellulose as gelator and Ru(bpy)₂(a-bpy)](PF₆)₂ as the luminophore and sensitizer is reported. The resulting gel exhibits a significant enhancement of its photoluminescence (PL) as well as a strong sensing response towards silver nanoparticles (AgNPs). The electrostatically interaction of the cationic amine groups of the luminophore and the carboxylic...

article

Sulfonated nanocellulose for the efficient dispersive micro solid-phase extraction and determination of silver nanoparticles in food products

Celia Ruiz-Palomero, M. Laura Soriano, Miguel Valcárcel

Journal of Chromatography A > 2016 > 1428 > C > 352-358

This paper reports a simple approach to Analytical Nanoscience and Nanotechnology (AN&N) that integrates the nanotool, sulfonated nanocellulose (s-NC), and nanoanalyte, silver nanoparticles (AgNPs), in the same analytical process by using an efficient, environmentally friendly dispersive micro solid-phase extraction (D-μSPE) capillary electrophoresis (CE) method with s-NC as sorbent material....

article

Improved microextraction of selected triazines using polymer monoliths modified with carboxylated multi-walled carbon nanotubes

Beatriz Fresco-Cala, Soledad Cárdenas, Miguel Valcárcel

Microchimica Acta > 2016 > 183 > 1 > 465-474

This article reports on the enhancement of the capacity of an acrylate-based monolithic solid sorbent by anchoring carboxylated multi-walled carbon nanotubes (c-MWCNTs) in its pores and on its surface. Monolithic poly(butyl acrylate-co-ethyleneglycol dimethacrylate) [poly(BA-co-EGDMA)] was synthetized inside a fused silica capillary via free-radical polymerization, and an ethanolic dispersion of c-MWCNTs...

article

Determination of TiO₂ nanoparticles in sunscreen using N-doped graphene quantum dots as a fluorescent probe

Sandra Benítez-Martínez, Ángela Inmaculada López-Lorente, Miguel Valcárcel

Microchimica Acta > 2016 > 183 > 2 > 781-789

The article describes a method for the determination of titanium oxide nanoparticles (TiO₂NPs) in sunscreens using N-doped graphene quantum dots (N-GQDs). The TiO₂-NPs are first extracted from the highly lipophilic sunscreen via liquid-liquid extraction. Subsequent fluorimetric analysis of the extracts is based on the quenching effect exerted by TiO₂NPs on the fluorescence of N-GQDs. The effect is...

article

Quo vadis, analytical chemistry?

Miguel Valcárcel

Analytical and Bioanalytical Chemistry > 2016 > 408 > 1 > 13-21

This paper presents an open, personal, fresh approach to the future of Analytical Chemistry in the context of the deep changes Science and Technology are anticipated to experience. Its main aim is to challenge young analytical chemists because the future of our scientific discipline is in their hands. A description of not completely accurate overall conceptions of our discipline, both past and present,...

article

The third way in analytical nanoscience and nanotechnology: Involvement of nanotools and nanoanalytes in the same analytical process

Ángela I. López-Lorente, Miguel Valcárcel

TrAC Trends in Analytical Chemistry > 2016 > 75 > C > 1-9

The classical working lines of analytical nanoscience and nanotechnology (AN&N) are the characterization/determination of nanomaterials and their use as tools (e.g., sorbents, inert/active supports, and sensors) for improving analytical processes. A widely discussed topic in the context of AN&N consists of the synergistic combination of these two facets in the same analytical process; that...

article

Determination of volatile compounds by GC–IMS to assign the quality of virgin olive oil

Rocío Garrido-Delgado, María del Mar Dobao-Prieto, Lourdes Arce, Miguel Valcárcel

Food Chemistry > 2015 > 187 > Complete > 572-579

The characterisation of different olive oil categories (extra virgin, virgin and lampante) using Ion Mobility Spectrometry (IMS) was improved by replacing the multicapillary column (MCC) with a capillary column (CC). The data obtained with MCC–IMS and CC–IMS were evaluated, studying both the global and the specific information obtained after the analysis of the volatile fraction of olive oils. A better...

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INFONA - science communication portal

Search results for: Miguel Valcárcel

Ionic-liquid-based microextraction method for the determination of silver nanoparticles in consumer products

Cyclodextrin-modified nanodiamond for the sensitive fluorometric determination of doxorubicin in urine based on its differential affinity towards β/γ-cyclodextrins

Analytical Nanoscience and Nanotechnology: Where we are and where we are heading

Fluorescent nanocellulosic hydrogels based on graphene quantum dots for sensing laccase

Photoluminescent sensing hydrogel platform based on the combination of nanocellulose and S,N-codoped graphene quantum dots

Integrated sampling and analysis unit for the determination of sexual pheromones in environmental air using fabric phase sorptive extraction and headspace-gas chromatography–mass spectrometry

Detection of nanocellulose in commercial products and its size characterization using asymmetric flow field-flow fractionation

Nanocellulose as analyte and analytical tool: Opportunities and challenges

Analytical methodologies for nanotoxicity assessment

Recent advances and trends in analytical nanoscience and nanotechnology

Preparation and evaluation of micro and meso porous silica monoliths with embedded carbon nanoparticles for the extraction of non-polar compounds from waters

Magnetic nanoparticles coated with ionic liquid for the extraction of endocrine disrupting compounds from waters

Selective extraction of Bactrocera oleae sexual pheromone from olive oil by dispersive magnetic microsolid phase extraction using a molecularly imprinted nanocomposite

Gels based on nanocellulose with photosensitive ruthenium bipyridine moieties as sensors for silver nanoparticles in real samples

Sulfonated nanocellulose for the efficient dispersive micro solid-phase extraction and determination of silver nanoparticles in food products

Improved microextraction of selected triazines using polymer monoliths modified with carboxylated multi-walled carbon nanotubes

Determination of TiO₂ nanoparticles in sunscreen using N-doped graphene quantum dots as a fluorescent probe

Quo vadis, analytical chemistry?

The third way in analytical nanoscience and nanotechnology: Involvement of nanotools and nanoanalytes in the same analytical process

Determination of volatile compounds by GC–IMS to assign the quality of virgin olive oil

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