Search Results - "Ayala, Juan H."

Vacuum-assisted headspace-solid phase microextraction for determining volatile free fatty acids and phenols. Investigations on the effect of pressure on competitive adsorption phenomena in a multicomponent system by Trujillo-Rodríguez, María J., Pino, Verónica, Psillakis, Elefteria, Anderson, Jared L., Ayala, Juan H., Yiantzi, Evangelia, Afonso, Ana M.

“…This work proposes a new vacuum headspace solid-phase microextraction (Vac-HSSPME) method combined to gas chromatography-flame ionization detection for the…”
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Utilization of highly robust and selective crosslinked polymeric ionic liquid-based sorbent coatings in direct-immersion solid-phase microextraction and high-performance liquid chromatography for determining polar organic pollutants in waters by Pacheco-Fernández, Idaira, Najafi, Ali, Pino, Verónica, Anderson, Jared L., Ayala, Juan H., Afonso, Ana M.

“…Several crosslinked polymeric ionic liquid (PIL)-based sorbent coatings of different nature were prepared by UV polymerization onto nitinol wires. They were…”
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Evaluation of Structurally Different Ionic Liquid-Based Surfactants in a Green Microwave-Assisted Extraction for the Flavonoids Profile Determination of Mangifera sp. and Passiflora sp. Leaves from Canary Islands by Moučková, Kristýna, Pacheco-Fernández, Idaira, Ayala, Juan H, Bajerová, Petra, Pino, Verónica

“…Aqueous solutions of ionic liquids (ILs) with surface active properties were used as extraction solvents, taking advantage of their impressive solvation…”
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Influence of Ligand Functionalization of UiO-66-Based Metal-Organic Frameworks When Used as Sorbents in Dispersive Solid-Phase Analytical Microextraction for Different Aqueous Organic Pollutants by Taima-Mancera, Iván, Rocío-Bautista, Priscilla, Pasán, Jorge, Ayala, Juan H, Ruiz-Pérez, Catalina, Afonso, Ana M, Lago, Ana B, Pino, Verónica

“…Four metal-organic frameworks (MOFs), specifically UiO-66, UiO-66-NH₂, UiO-66-NO₂, and MIL-53(Al), were synthesized, characterized, and used as sorbents in a…”
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Application of a Pillared-Layer Zn-Triazolate Metal-Organic Framework in the Dispersive Miniaturized Solid-Phase Extraction of Personal Care Products from Wastewater Samples by González-Hernández, Providencia, Lago, Ana B, Pasán, Jorge, Ruiz-Pérez, Catalina, Ayala, Juan H, Afonso, Ana M, Pino, Verónica

“…The pillared-layer Zn-triazolate metal-organic framework (CIM-81) was synthesized, characterized, and used for the first time as a sorbent in a dispersive…”
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Mixed Functionalization of Organic Ligands in UiO-66: A Tool to Design Metal-Organic Frameworks for Tailored Microextraction by González-Rodríguez, Gabriel, Taima-Mancera, Iván, Lago, Ana B, Ayala, Juan H, Pasán, Jorge, Pino, Verónica

“…The mixed-ligand strategy was selected as an approach to tailor a metal-organic framework (MOF) with microextraction purposes. The strategy led to the…”
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Green solid-phase microextraction fiber coating based on the metal-organic framework CIM-80(Al): Analytical performance evaluation in direct immersion and headspace using gas chromatography and mass spectrometry for the analysis of water, urine and brewed coffee by Pacheco-Fernández, Idaira, Rentero, Manuel, Ayala, Juan H., Pasán, Jorge, Pino, Verónica

“…A new solid-phase microextraction (SPME) fiber coating was prepared by the immobilization of the metal-organic framework (MOF) CIM-80(Al) on nitinol wires by a…”
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The metal–organic framework HKUST-1 as efficient sorbent in a vortex-assisted dispersive micro solid-phase extraction of parabens from environmental waters, cosmetic creams, and human urine by Rocío-Bautista, Priscilla, Martínez-Benito, Carla, Pino, Verónica, Pasán, Jorge, Ayala, Juan H., Ruiz-Pérez, Catalina, Afonso, Ana M.

“…Three metal–organic frameworks (MOFs), specifically HKUST-1, MOF-5, and MIL-53(Al), have been synthetized, characterized, studied and compared in a…”
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Headspace solid-phase microextraction based on the metal-organic framework CIM-80(Al) coating to determine volatile methylsiloxanes and musk fragrances in water samples using gas chromatography and mass spectrometry by González-Hernández, Providencia, Pacheco-Fernández, Idaira, Bernardo, Fábio, Homem, Vera, Pasán, Jorge, Ayala, Juan H., Ratola, Nuno, Pino, Verónica

“…A headspace solid-phase microextraction (HS-SPME) method was developed using the metal-organic framework (MOF) CIM-80(Al) as extraction phase and in…”
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Effervescence tablets based on magnetic ionic liquids as simple microdevices for the in situ dispersive liquid-liquid microextraction of urinary biomarkers by González-Martín, Raúl, Trujillo-Rodríguez, María J., Freire, Mara G., Ayala, Juan H., Pino, Verónica

“…Magnetic ionic liquids (MILs) have been explored in dispersive liquid-liquid microextraction (DLLME). Their usage allows to substitute centrifugation and/or…”
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Guanidinium ionic liquid-based surfactants as low cytotoxic extractants: Analytical performance in an in-situ dispersive liquid–liquid microextraction method for determining personal care products by Pacheco-Fernández, Idaira, Pino, Verónica, Ayala, Juan H., Afonso, Ana M.

“…•A new guanidinium IL-based surfactant (C8Gu-Cl) was synthetized.•The micellar behavior of C8Gu-Cl was studied with different techniques.•C8Gu-Cl shows low…”
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Insights in the analytical performance of neat metal-organic frameworks in the determination of pollutants of different nature from waters using dispersive miniaturized solid-phase extraction and liquid chromatography by Rocío-Bautista, Priscilla, Pino, Verónica, Pasán, Jorge, López-Hernández, Irene, Ayala, Juan H., Ruiz-Pérez, Catalina, Afonso, Ana M.

“…Five metal-organic frameworks (MOFs), specifically HKUST-1, MOF-5(Zn), MIL-53(Al), UiO-64 and MOF-74(Zn) are synthesized, characterized, and utilized in a…”
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Evolution and current advances in sorbent-based microextraction configurations by Trujillo-Rodríguez, María J., Pacheco-Fernández, Idaira, Taima-Mancera, Iván, Díaz, Juan H. Ayala, Pino, Verónica

“…•Sorbent-based microextraction strategies are classified in SPME or µ-SPE•Operational steps and sorbent configuration are the criteria for the…”
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A magnetic-based dispersive micro-solid-phase extraction method using the metal-organic framework HKUST-1 and ultra-high-performance liquid chromatography with fluorescence detection for determining polycyclic aromatic hydrocarbons in waters and fruit tea infusions by Rocío-Bautista, Priscilla, Pino, Verónica, Ayala, Juan H., Pasán, Jorge, Ruiz-Pérez, Catalina, Afonso, Ana M.

“…•The composite MOF HKUST-1+Fe3O4 MNPs is prepared by simple mixing.•The material (25mg) is used in a magnetic-assisted extraction method and UHPLC-FD.•The…”
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A green miniaturized aqueous biphasic system prepared with cholinium chloride and a phosphate salt to extract and preconcentrate personal care products in wastewater samples by Šulc, Jakub, Pacheco-Fernández, Idaira, Ayala, Juan H., Bajerová, Petra, Pino, Verónica

“…•A miniaturized aqueous biphasic system (µ-ABS) is formed with food additives.•Cholinium chloride is used as extraction phase and K2HPO4 as salting-out…”
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Solid-phase microextraction coatings based on the metal-organic framework ZIF-8: Ensuring stable and reusable fibers by Rocío-Bautista, Priscilla, Gutiérrez-Serpa, Adrián, Cruz, Alexander John, Ameloot, Rob, Ayala, Juan H., Afonso, Ana M., Pasán, Jorge, Rodríguez-Hermida, Sabina, Pino, Verónica

“…Chemical vapor deposition of MOFs (MOF-CVD) has been used to coat solid-phase microextraction (SPME) fibers with ZIF-8, by exposing ZnO layers to the linker…”
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Salt-induced ionic liquid-based microextraction using a low cytotoxic guanidinium ionic liquid and liquid chromatography with fluorescence detection to determine monohydroxylated polycyclic aromatic hydrocarbons in urine by Pacheco-Fernández, Idaira, Pino, Verónica, Lorenzo-Morales, Jacob, Ayala, Juan H., Afonso, Ana M.

“…A novel ionic liquid (IL)-based microextraction method has been developed for the determination of four hydroxylated polycyclic aromatic hydrocarbons (OHPAHs)…”
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Use of a pH-sensitive polymer in a microextraction and preconcentration method directly combined with high-performance liquid chromatography by González-Martín, Raúl, Pacheco-Fernández, Idaira, Maiti, Binoy, Ayala, Juan H., Afonso, Ana M., Díaz, David Díaz, Pino, Verónica

“…•A pH-sensitive polymer is used in a microextraction and preconcentration method.•The method simply bases on the formation of a hydrogel by modification of…”
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Magnetic ionic liquids as non-conventional extraction solvents for the determination of polycyclic aromatic hydrocarbons by Trujillo-Rodríguez, María J., Nacham, Omprakash, Clark, Kevin D., Pino, Verónica, Anderson, Jared L., Ayala, Juan H., Afonso, Ana M.

“…This work describes the applicability of magnetic ionic liquids (MILs) in the analytical determination of a group of heavy polycyclic aromatic hydrocarbons…”
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Ionic liquid-based miniaturized aqueous biphasic system to develop an environmental-friendly analytical preconcentration method by González-Martín, Raúl, Pacheco-Fernández, Idaira, Ayala, Juan H., Afonso, Ana M., Pino, Verónica

“…Two ILs containing guanidinium cations (butylguanidinium chloride –C4Gu-Cl– and hexylguanidinium chloride –C6Gu-Cl–) were synthesized and characterized. Their…”
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