20 documents found, page 1 of 2
An Eco-Friendly Proposal by Integrating Chromatographic Fingerprinting and Mult...
Valderrama,Leonardo; Demczuk Jr.,Bogdan; Valderrama,Patrícia; Carasek,EduardoA potential eco-friendly method without organic solvents is presented by integrating a chromatographic fingerprint and multivariate control chart based on Q residuals to differentiate grape juices from different farming practices. The sample preparation was only water dilution, and the mobile phase was water acidified with sulfuric acid, which can be readily neutralized before its disposal. The proposed method ...
A New Approach for Histamine Functionalized Nanoparticles as Sorbent Phase for ...
Lopes,Daniela; Morés,Lucas; Bernardi,Gabrieli; Campedelli,Roberta R.; Pinheiro,Gabriela; Souza,Bruno S. de; Carasek,EduardoIn this study, for the first time, histamine-functionalized magnetic nanoparticles (HIS-MNP) were used as sorbent phase combined with bar adsorptive microextraction (BAµE) for the determination of methylparaben (MP), ethylparaben (EP), propylparaben (PP), and butylparaben (BP) in water samples by high performance liquid chromatography coupled with diode array detection (HPLC-DAD). Extraction and desorption cond...
A Green Procedure Using Disposable Pipette Extraction to Determine Polycyclic A...
Garcia,Karine O.; Frena,Morgana; Bittencourt,Otávio R.; Magosso,Hérica A.; Carasek,Eduardo; Madureira,Luiz A. S.A simple and efficient method using reduced amounts of solvents for the determination of polycyclic aromatic sulfur heterocycles (PASHs) in aqueous matrices from a lagoon and leachate solid waste from a petrochemical industry is proposed. The target analytes were previously concentrated using the disposable pipette extraction (DPX) technique applying gas chromatography-mass spectrometry (GC-MS) for analysis. In...
SELEÇÃO QUE VESTE A CAMISA
Huelsmann,Ricardo Dagnoni; Laia,Lucas Ribeiro de; Carasek,EduardoTEAM THAT GIVES ITS BEST. Football is the most practiced sport in the world, and admittedly one of the biggest cultural manifestations in Brazil. Its size and importance impact many fields of science. In this work, a playful and interactive activity is proposed, which allows the so beloved national sport and Chemistry to be united in a fun and reflective way, through the selection of the dream team. Each team c...
Exploring Polypyrrole as Extraction Phase for Disposable Pipette Extraction Met...
Huelsmann,Ricardo D.; Turazzi,Francielle C.; Barra,Guilherme M. O.; Carasek,EduardoThe use of a polypyrrole (PPy) is described as an efficient extraction phase for disposable pipette extraction (DPX), in a fast and ruggedized analytical method for simultaneous determination of 18 organic micro-pollutants in water using gas chromatography-mass spectrometry (GC-MS). The DPX-blank pipettes were filled with PPy, a material produced through the chemical polymerization of PPy using iron(III) chlori...
Electrode Modified with the Ionic Liquid [P6,6,6,14+]2[MnCl42-] for the Determi...
Silva,Tânia Regina; Merib,Josias; Spudeit,Daniel A.; Carasek,Eduardo; Vieira,Iolanda C.This paper describes a new and simple electrode for the determination of bisphenol A (BPA) in different plastic samples using carbon paste electrode (CPE) modified with a trihexyltetradecylphosphonium tetrachloromanganate(II) ([P6,6,6,14+]2[MnCl42-]) magnetic ionic liquid (MIL/CPE). Electrochemical characterization of MIL/CPE by cyclic voltammetry and electrochemical impedance spectroscopy indicated that MIL fa...
Assessment of a Fully Optimized DPX-Based Procedure for the Multiclass Determin...
Corazza,Gabriela; Merib,Josias; Carmo,Sângela N. do; Mendes,Leila D.; Carasek,EduardoIn this study, a disposable pipette extraction (DPX)-based procedure was fully optimized for the multiclass determination of 12 pesticides, with significant differences in their physicochemical properties, using high-performance liquid chromatography coupled with diode array detection (HPLC-DAD). The variables optimized were type of extraction phase, sample pH, sample volume, number of extraction and desorption...
Use of a Natural Sorbent as Alternative Solid-Phase Microextraction Coating for...
Suterio,Natália G.; Carmo,Sângela N. do; Budziak,Dilma; Merib,Josias; Carasek,EduardoIn this study, the use of bracts as a natural sorbent in solid-phase microextraction was exploited for use in the determination of polycyclic aromatic hydrocarbons in water samples with separation/detection performed by gas chromatography-mass spectrometry. Fiber-to-fiber reproducibility was evaluated and the relative standard deviation (RSD) was lower than 14%. Optimizations were performed using both the propo...
Study of Viability of Solid-Phase Microextraction, in vivo, in the Extraction o...
Schacker,Robson L.; Moritz,Denise E.; Caro,Miguel S. B.; Madureira,Luiz A. S.; Dias,Adriana N.; Merib,Josias O.; Isfran,Douglas; Carasek,EduardoMicrobial volatile organic compounds (MVOCs) are present in several production processes in biotechnology. In this study it is evaluated the viability of use of a method involving solid-phase microextraction (SPME), in vivo SPME, in the extraction of MVOCs, associated with the pigment production process by the Monascus fungus. PDMS/Car/DVB (50/30 µm) fiber in the headspace mode (HS-SPME) and gas chromatography-...
Exploiting Cork as Biosorbent Extraction Phase for Solid-Phase Microextraction ...
Silva,Ana C.; Dias,Adriana N.; Carasek,EduardoIn this study, a method for the determination of 3-(4-methylbenzylidene)camphor (4-MBC) and 2-ethylhexyl 4-(dimethylamino)benzoate (OD-PABA) in river water samples employing cork as the SPME (solid-phase microextraction) fiber was developed. The extraction parameters optimized were pH, ionic strength and extraction time and temperature. For the extraction step, the sample pH was studied in univariate experiment...