Search results for: Alberto Chisvert

Items from 1 to 20 out of 38 results

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Ultramicroextraction as a miniaturization of the already miniaturized. A step toward nanoextraction and beyond

Cristian Azorín, Juan L. Benedé, Alberto Chisvert

Journal of Separation Science > 46 > 15 > n/a - n/a

Miniaturization of the analytical process has been a widespread trend, and the sample preparation stage is not exempted from this downscaling. Since the introduction of microextraction techniques as miniaturization of classical extraction techniques, they have become one of the strengths in this field. However, some of the original approaches to these techniques did not fully cover all the current...

article

Use of green alternative solvents in dispersive liquid‐liquid microextraction: A review

José Grau, Cristian Azorín, Juan L. Benedé, Alberto Chisvert, more

Journal of Separation Science > 45 > 1 > 210 - 222

Dispersive liquid‐liquid microextraction is one of the most widely used microextraction techniques currently in the analytical chemistry field, mainly due to its simplicity and rapidity. The operational mode of this approach has been constantly changing since its introduction, adapting to new trends and applications. Most of these changes are related to the nature of the solvent employed for the microextraction...

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Determination of N‐nitrosamines in cosmetic products by vortex‐assisted reversed‐phase dispersive liquid–liquid microextraction and liquid chromatography with mass spectrometry

Pablo Miralles, Alberto Chisvert, Amparo Salvador

Journal of Separation Science > 41 > 15 > 3143 - 3151

A new analytical method for the simultaneous determination of trace levels of seven prohibited N‐nitrosamines (N‐nitrosodimethylamine, N‐nitrosoethylmethylamine, N‐nitrosopyrrolidine, N‐nitrosodiethylamine, N‐nitrosopiperidine, N‐nitrosomorpholine, and N‐nitrosodiethanolamine) in cosmetic products has been developed. The method is based on vortex‐assisted reversed‐phase dispersive liquid–liquid microextraction,...

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Trace determination of volatile polycyclic aromatic hydrocarbons in natural waters by magnetic ionic liquid-based stir bar dispersive liquid microextraction

Juan L. Benedé, Jared L. Anderson, Alberto Chisvert

Talanta > 2018 > 176 > C > 253-261

In this work, a novel hybrid approach called stir bar dispersive liquid microextraction (SBDLME) that combines the advantages of stir bar sorptive extraction (SBSE) and dispersive liquid-liquid microextraction (DLLME) has been employed for the accurate and sensitive determination of ten polycyclic aromatic hydrocarbons (PAHs) in natural water samples. The extraction is carried out using a neodymium...

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Introducing a new and rapid microextraction approach based on magnetic ionic liquids: Stir bar dispersive liquid microextraction

Alberto Chisvert, Juan L. Benedé, Jared L. Anderson, Stephen A. Pierson, more

Analytica Chimica Acta > 2017 > 983 > C > 130-140

With the aim of contributing to the development and improvement of microextraction techniques, a novel approach combining the principles and advantages of stir bar sorptive extraction (SBSE) and dispersive liquid-liquid microextraction (DLLME) is presented. This new approach, termed stir bar dispersive liquid microextraction (SBDLME), involves the addition of a magnetic ionic liquid (MIL) and a neodymium-core...

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Determination of N-nitrosodiethanolamine in cosmetic products by reversed-phase dispersive liquid-liquid microextraction followed by liquid chromatography

Alberto Chisvert, Juan L. Benedé, María Peiró, Isabel Pedrón, more

Talanta > 2017 > 166 > C > 81-86

A new analytical method for the determination of N-nitrosodiethanolamine (NDELA), a very harmful compound not allowed in cosmetic products, is presented. The method is based on a new approach of dispersive liquid–liquid microextraction (DLLME) useful for extraction of highly polar compounds, called reversed-phase DLLME (RP-DLLME), followed by liquid chromatography–ultraviolet/visible (LC-UV/Vis) determination...

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Stir bar sorptive-dispersive microextraction mediated by magnetic nanoparticles–nylon 6 composite for the extraction of hydrophilic organic compounds in aqueous media

Juan L. Benedé, Alberto Chisvert, Dimosthenis L. Giokas, Amparo Salvador

Analytica Chimica Acta > 2016 > 926 > C > 63-71

A new and sensitive analytical method based on the recently developed approach termed stir bar-sorptive dispersive microextraction (SBSDME) using a magnetic CoFe₂O₄@SiO₂–nylon 6 composite as sorbent material is presented for the extraction of hydrophilic organic compounds. The simultaneous determination of four hydrophilic UV filters in environmental water samples has been chosen as a model analytical...

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Determination of alternative preservatives in cosmetic products by chromophoric derivatization followed by vortex-assisted liquid–liquid semimicroextraction and liquid chromatography

Pablo Miralles, Ilianna Vrouvaki, Alberto Chisvert, Amparo Salvador

Talanta > 2016 > 154 > C > 1-6

An analytical method for the simultaneous determination of phenethyl alcohol, methylpropanediol, phenylpropanol, caprylyl glycol, and ethylhexylglycerin, which are used as alternative preservatives in cosmetic products, has been developed. The method is based on liquid chromatography with UV spectrophotometric detection after chromophoric derivatization with benzoyl chloride and vortex-assisted liquid–liquid...

article

Determination of ultraviolet filters in bathing waters by stir bar sorptive–dispersive microextraction coupled to thermal desorption–gas chromatography–mass spectrometry

Juan L. Benedé, Alberto Chisvert, Dimosthenis L. Giokas, Amparo Salvador

Talanta > 2016 > 147 > C > 246-252

In this work, a new approach that combines the advantages of stir bar sorptive extraction (SBSE) and dispersive solid phase extraction (DSPE), i.e. stir bar sorptive–dispersive microextraction (SBSDµE), is employed as enrichment and clean-up technique for the sensitive determination of eight lipophilic UV filters in water samples. The extraction is accomplished using a neodymium stir bar magnetically...

article

Vortex-assisted emulsification semimicroextraction for the analytical control of restricted ingredients in cosmetic products: determination of bronopol by liquid chromatography

Pablo Miralles, Raquel Bellver, Alberto Chisvert, Amparo Salvador

Analytical and Bioanalytical Chemistry > 2016 > 408 > 7 > 1929-1934

Vortex-assisted emulsification semimicroextraction is proposed as a one-step solution-extraction procedure for sample preparation in cosmetic products. The procedure allows rapid preparation based on dispersion of the sample in a mixture of 1 mL of n-hexane and 0.5 mL of ethanol, followed by the addition of 0.5 mL of water and centrifugation to obtain two separated phases. This procedure provides...

article

In-situ suspended aggregate microextraction: A sample preparation approach for the enrichment of organic compounds in aqueous solutions

Juan L. Benedé, Dimosthenis L. Giokas, Alberto Chisvert, Amparo Salvador

Journal of Chromatography A > 2015 > 1408 > Complete > 63-71

This work presents in-situ suspended aggregate microextraction (iSAME) as a new and expedient sample preparation method. This new concept capitalizes on the general principles of in-situ solvent formation microextraction, in the sense that extraction is carried out in a supramolecular aggregate phase, which is formed in-situ in the sample through one-step process involving ion-association between...

article

Determination of hydroxytyrosol and tyrosol by liquid chromatography for the quality control of cosmetic products based on olive extracts

Pablo Miralles, Alberto Chisvert, Amparo Salvador

Journal of Pharmaceutical and Biomedical Analysis > 2015 > 102 > Complete > 157-161

An analytical method for the simultaneous determination of hydroxytyrosol and tyrosol in different types of olive extract raw materials and cosmetic cream samples has been developed. The determination was performed by liquid chromatography with UV spectrophotometric detection. Different chromatographic parameters, such as mobile phase pH and composition, oven temperature and different sample preparation...

article

Development of stir bar sorptive-dispersive microextraction mediated by magnetic nanoparticles and its analytical application to the determination of hydrophobic organic compounds in aqueous media

Juan L. Benedé, Alberto Chisvert, Dimosthenis L. Giokas, Amparo Salvador

Journal of Chromatography A > 2014 > 1362 > C > 25-33

A novel microextraction technique combining the principles of stir bar sorptive extraction (SBSE) and dispersive micro-solid phase extraction (DμSPE) is presented. The main feature of the method is the use of a neodymium-core stirring bar physically coated with a hydrophobic magnetic nanosorbent. Depending on stirring speed, the magnetic sorbent either acts as a coating material to the stir bar, thus...

article

Determination of atranol and chloroatranol in perfumes using simultaneous derivatization and dispersive liquid–liquid microextraction followed by gas chromatography–mass spectrometry

Marina López-Nogueroles, Alberto Chisvert, Amparo Salvador

Analytica Chimica Acta > 2014 > 826 > Complete > 28-34

A new analytical method based on simultaneous derivatization and dispersive liquid–liquid microextraction (DLLME) followed by gas chromatography–mass spectrometry (GC–MS), for the determination of the allergenic compounds atranol and chloroatranol in perfumes, is presented. Derivatization of the target analytes by means of acetylation with anhydride acetic in carbonate buffer was carried out. Thereby...

article

Determination of benzophenone-3 and its main metabolites in human serum by dispersive liquid–liquid microextraction followed by liquid chromatography tandem mass spectrometry

Isuha Tarazona, Alberto Chisvert, Amparo Salvador

Talanta > 2013 > 116 > Complete > 388-395

A new analytical method for the determination of benzophenone-3 (2-hydroxy-4-methoxybenzophenone), and its main metabolites (2,4-dihydroxybenzophenone and 2,2’-dihydroxy-4-methoxybenzophenone) in human serum is presented. The method is based on dispersive liquid–liquid microextraction (DLLME) as preconcentration and clean-up technique, followed by liquid chromatography tandem mass spectrometry (LC-MS/MS)...

article

A reliable and environmentally-friendly liquid-chromatographic method for multi-class determination of fat-soluble UV filters in cosmetic products

Alberto Chisvert, Isuha Tarazona, Amparo Salvador

Analytica Chimica Acta > 2013 > 790 > Complete > 61-67

An environmentally-friendly analytical method for the simultaneous determination of 15 fat-soluble ultraviolet (UV) filters currently authorized by the European Union regulation on cosmetic products has been developed. The determination was performed by liquid chromatography with UV spectrophotometric detection. Different parameters, such as type of column, oven temperature, mobile phase composition...

article

Development of a selective solid phase extraction method for nitro musk compounds in environmental waters using a molecularly imprinted sorbent

Marina Lopez-Nogueroles, Sonia Lordel-Madeleine, Alberto Chisvert, Amparo Salvador, more

Talanta > 2013 > 110 > Complete > 128-134

A powerful analytical method for the determination of the family of the nitro musk compounds at trace level in environmental waters—river, sea, and water from a treatment plant—is presented. The method is based on the use of molecularly imprinted silica (MIS) as sorbent for solid phase extraction (SPE) used for the clean-up and the concentration step of the target analytes previous to their determination...

article

An overview of the analytical methods for the determination of organic ultraviolet filters in biological fluids and tissues

Alberto Chisvert, Zacarías León-González, Isuha Tarazona, Amparo Salvador, more

Analytica Chimica Acta > 2012 > 752 > Complete > 11-29

Organic UV filters are chemical compounds added to cosmetic sunscreen products in order to protect users from UV solar radiation. The need of broad-spectrum protection to avoid the deleterious effects of solar radiation has triggered a trend in the cosmetic market of including these compounds not only in those exclusively designed for sun protection but also in all types of cosmetic products.Different...

article

Cloud point–dispersive μ-solid phase extraction of hydrophobic organic compounds onto highly hydrophobic core–shell Fe2O3@C magnetic nanoparticles

Dimosthenis L. Giokas, Qing Zhu, Qinmin Pan, Alberto Chisvert

Journal of Chromatography A > 2012 > 1251 > C > 33-39

A novel two-step extraction technique combining cloud point extraction (CPE) with dispersive micro-solid phase extraction (D-μ-SPE) is presented in this work for the first time. The method involves initial extraction of the target analytes by CPE in the micelles of a non-ionic surfactant medium; then highly hydrophobic polysiloxane-coated core–shell Fe₂O₃@C magnetic nanoparticles (MNPs) are used to...

article

Dispersive solid-phase extraction based on oleic acid-coated magnetic nanoparticles followed by gas chromatography–mass spectrometry for UV-filter determination in water samples

Iván P. Román, Alberto Chisvert, Antonio Canals

Journal of Chromatography A > 2011 > 1218 > 18 > 2467-2475

A sensitive analytical method to concentrate and determine extensively used UV filters in cosmetic products at (ultra)trace levels in water samples is presented. The method is based on a sample treatment using dispersive solid-phase extraction (dSPE) with laboratory-made chemisorbed oleic acid-coated cobalt ferrite (CoFe ₂ O ₄ @oleic acid) magnetic nanoparticles (MNPs) as optimized...

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INFONA - science communication portal

Search results for: Alberto Chisvert

Ultramicroextraction as a miniaturization of the already miniaturized. A step toward nanoextraction and beyond

Use of green alternative solvents in dispersive liquid‐liquid microextraction: A review

Determination of N‐nitrosamines in cosmetic products by vortex‐assisted reversed‐phase dispersive liquid–liquid microextraction and liquid chromatography with mass spectrometry

Trace determination of volatile polycyclic aromatic hydrocarbons in natural waters by magnetic ionic liquid-based stir bar dispersive liquid microextraction

Introducing a new and rapid microextraction approach based on magnetic ionic liquids: Stir bar dispersive liquid microextraction

Determination of N-nitrosodiethanolamine in cosmetic products by reversed-phase dispersive liquid-liquid microextraction followed by liquid chromatography

Stir bar sorptive-dispersive microextraction mediated by magnetic nanoparticles–nylon 6 composite for the extraction of hydrophilic organic compounds in aqueous media

Determination of alternative preservatives in cosmetic products by chromophoric derivatization followed by vortex-assisted liquid–liquid semimicroextraction and liquid chromatography

Determination of ultraviolet filters in bathing waters by stir bar sorptive–dispersive microextraction coupled to thermal desorption–gas chromatography–mass spectrometry

Vortex-assisted emulsification semimicroextraction for the analytical control of restricted ingredients in cosmetic products: determination of bronopol by liquid chromatography

In-situ suspended aggregate microextraction: A sample preparation approach for the enrichment of organic compounds in aqueous solutions

Determination of hydroxytyrosol and tyrosol by liquid chromatography for the quality control of cosmetic products based on olive extracts

Development of stir bar sorptive-dispersive microextraction mediated by magnetic nanoparticles and its analytical application to the determination of hydrophobic organic compounds in aqueous media

Determination of atranol and chloroatranol in perfumes using simultaneous derivatization and dispersive liquid–liquid microextraction followed by gas chromatography–mass spectrometry

Determination of benzophenone-3 and its main metabolites in human serum by dispersive liquid–liquid microextraction followed by liquid chromatography tandem mass spectrometry

A reliable and environmentally-friendly liquid-chromatographic method for multi-class determination of fat-soluble UV filters in cosmetic products

Development of a selective solid phase extraction method for nitro musk compounds in environmental waters using a molecularly imprinted sorbent

An overview of the analytical methods for the determination of organic ultraviolet filters in biological fluids and tissues

Cloud point–dispersive μ-solid phase extraction of hydrophobic organic compounds onto highly hydrophobic core–shell Fe2O3@C magnetic nanoparticles

Dispersive solid-phase extraction based on oleic acid-coated magnetic nanoparticles followed by gas chromatography–mass spectrometry for UV-filter determination in water samples

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