Isabel Costas Mora

Isabel Costas Mora
University of Vigo | UVIGO · Department of Analytical and Food Chemistry

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31
Publications
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Publications

Publications (31)
Article
A new synthesis approach for obtaining fluorescent carbon dots (CDs) based on UV irradiation of carbohydrates was developed. The photochemical synthesis pathway allows the formation of water soluble CDs of analytical usefulness within one min. CDs obtained by photochemical treatment from the sucrose/NaOH/poly(ethylene glycol) system are monodispers...
Article
Full-text available
Carbon dots (CDs) are a recently discovered class of fluorescent nanomaterials with great potential to be applied in the analytical field. CDs have demonstrated to be a promising alternative to conventional organic fluorophores or quantum dots as optical nano-probes for sensing different chemical species. In this overview, we review the progress in...
Article
A new fluorescent assay based on in situ ultrasound-assisted synthesis of carbon dots (CDs) as optical nanoprobes for the detection of methylmercury has been developed. Application of high intensity sonication allows performing simultaneously the synthesis of fluorescent CDs within the analytical time scale and the selective recognition of the targ...
Article
Systems based on quantum dots (QDs) have received great attention in recent years in the field of analytical chemistry for the detection of a variety of analytes. In this overview, we review novel methods based on the employment of QDs for inorganic-trace analysis, making use of liquid-phase and solid-phase systems, reversible and even visual and m...
Article
In this work, a rapid and simple analytical method for the quality control of iodized salt based on simultaneous ultrasound-assisted iodide oxidation and liquid-liquid microextraction, with the subsequent measurement of the organic phase by UV–vis micro-spectrophotometry is described. An aqueous sample solution along with 50 μL of carbon tetrachlor...
Chapter
En este trabajo se presenta un proyecto experimental pensado para alumnos de química medioambiental, en el que se propone utilizar nanopartículas, base de la nanotecnología actual, para abordar un problema de interés general como es la deficiente eliminación de elementos tóxicos del medio acuático. Concretamente, se propone la utilización de nanopa...
Article
In this work, a fast and miniaturised procedure based on the use of a natural deep eutectic solvent (NADES) in combination with ultrasound-assisted extraction (UAE) has been proposed for gluten determination by a commercial enzyme-linked immunosorbent assay (ELISA). Fourteen NADESs were prepared by combining two natural primary metabolites and wate...
Article
In this work, a novel analytical approach for determining methyl(cyclopentadienyl)-tricarbonyl (MMT) by total reflection X-ray fluorescence (TXRF) based on its trapping onto unmodified graphene membranes is described. Graphene membranes were synthesized by mild-thermal reduction of graphene oxide following drop-casting onto a glass substrate. High...
Article
Fabrication of unmodified graphene membranes for their application as selective sorptive platforms of hexavalent chromium [Cr(VI)] is described for the first time. Multilayer graphene membranes are synthesized by drop-casting of graphene oxide (GO) onto a glass substrate followed by mild thermal reduction. As-prepared membranes are formatted to fit...
Conference Paper
Full-text available
1. Objectives Immobilization of surfactant-free noble metal nanoparticles (NPs) on quartz substrates could provide new avenues for the development of solid phase microextraction in combination with total reflection X-ray fluorescence (TXRF). The use of immobilized NPs allows the direct trapping of volatile analytes onto sample carriers without the...
Conference Paper
1. Objectives In this work, integration of synthesis and sensing processes is proposed as a novel strategy for the development of rapid assays based on carbon dots (CDs). Different green pathways were used in order to build in situ integrated systems including sonochemical and photochemical treatments. The sonochemistry-based system allows to detec...
Conference Paper
Dissolved reactive phosphorus (DRP) is considered the fraction of phosphorus that contributes the most to the eutrophication of surface waters [1]. DRP refers to the fraction of phosphorus that responds to chemical reactions without previous hydrolysis or oxidation after filtration through 0.45 μm membrane filters. An analytical methodology for the...
Conference Paper
In the last years, a great interest has arisen on new chemiluminescent systems due to the attractive properties of chemiluminescence-based assays such as high sensitivity, wide linear range and simple instrumentation required. In this sense, different nanomaterials have been tried as chemiluminescence (CL) emitters including metal and semiconductor...
Conference Paper
Full-text available
Sulphur dioxide (E220) and its precursor salts (sodium sulphite, E221; sodium hydrogen sulphite, E222; sodium metabisulphite, E223; potassium metabisulphite, E224; calcium sulphite E226; calcium hydrogen sulphite E227; potassium hydrogen sulphite, E228) are important stabiliser and preservative in food industry. Nevertheless, they are banned in fre...
Article
Nanostructured materials play roles in different areas of analytical chemistry. Implementation of nanomaterials in liquid-phase microextraction results in a synergic combination yielding enhanced performance. Some significant examples include: carbon nanotubes for improving extraction efficiency; magnetic nanoparticles for retrieval ionic liquids o...
Article
In this work, a novel method for determining Sb and Bi based on the trapping of their covalent hydrides onto quartz reflectors coated with immobilized palladium nanoparticles (Pd NPs) followed by total reflection X-ray fluorescence (TXRF) analysis is proposed. Pd NPs were synthesized by chemical reduction of the metal precursor using a mixture of w...
Conference Paper
In this work, fluorescent quantum dots (QDs) and gold nanoclusters (Au NCs) are confined in a drop to develop a novel sensing platform for metal ions and organometals at trace level (detection limits in the range of micro-to-nano molar). A portable micro-fluorospectrometer was employed for fluorescence measurement. CdSe and core-shell CdSe/ZnS QDs...
Conference Paper
In the last years there has been a great interest towards the development of optical nanosensors. To this end, fluorescent nanomaterials have been implemented in analytical systems for the detection of toxic metal species. Recently, fluorescent carbon dots (CDs) have received much attention due to their attractive properties such as strong fluoresc...
Article
In this work, a simple route for the synthesis of surfactant-free immobilized palladium nanoparticles (Pd NPs) and their use as effective nanocatalysts for metal hydride decomposition is described. A mixture of ethanol:water was used as reducing agent. Ethanol was added in a large excess to reduce the ionic Pd and stabilize the obtained Pd NPs. Eth...
Article
Principle 8 of Green Chemistry recommends eliminating derivatization, yet it is difficult to fulfill in analytical chemistry, so we consider the design of environment-friendly derivatization procedures in this article. We provide an overview on the main strategies for achieving greener derivatization procedures, emphasizing the use of less hazardou...
Article
In this work, a new analytical approach based on the trapping of Se and Hg vapours using silver nanoparticles (Ag NPs) immobilized on quartz reflectors, prior to their determination by total reflection X-ray fluorescence (TXRF), is proposed. Ag NPs were synthesized by reduction of the metal precursor with a reducing agent in aqueous solution. Silan...
Article
In this work, in situ ultrasound-assisted magnetite synthesis with simultaneous ion co-precipitation (UAMSSIC) was applied to magnetic solid-phase extraction (MSPE) of Cu, Zn, Ge, As, Se, Re, Au, Hg, Tl, Bi and Pb. The magnetic solid phase (MSP) enriched with metal ions was directly analyzed by total reflection X-ray fluorescence (TXRF). Magnetite...
Article
Following a preliminary work (Costas-Mora, I.; Romero, V.; Pena-Pereira, F.; Lavilla, I.; Bendicho, C. Anal. Chem.2011, 83, 2388-2393), a quenching mechanism has been established for the selective detection of Se (as selenium hydride) by microfluorospectrometry using CdSe quantum dots (QDs) as luminescent probes stabilized with hexadecylamine and c...
Article
UV-Vis spectrometry has become a widespread analytical technique due to its inherent features (e.g., simplicity, ease of operation, convenience and economy). The necessity to decrease the consumption of valuable and scarce samples, together with the application of novel sample-retention technologies, the improvement of materials and the development...
Article
A miniaturized method based on liquid-phase microextraction (LPME) in combination with microvolume UV-vis spectrophotometry for monitoring ammonia in waters is proposed. The methodology is based on the extraction of the ion pair formed between the blue indophenol obtained according to the Berthelot reaction and a quaternary ammonium salt into a mic...
Article
In this work, different Pd-based substrates (i.e. Pd wire, Pd-coated stainless steel wire and Pd-coated SiO2) are tried for microextraction of Hg prior to its release into a modified quartz T-cell so as to develop a costeffective, sensitive and easy-to-handle coupling between solid-phase microextraction (SPME) and atomic absorption spectrometry. Th...
Article
Core-shell CdSe/ZnS quantum dots (QDs) dispersed in a droplet of organic solvent have been applied for the first time as luminescent probes for the selective detection of volatile species. Luminescence quenching caused by volatile species was examined after their trapping onto a drop using the headspace single-drop microextraction (HS-SDME) approac...