Themed collection ENQA - 20th Brazilian Meeting on Analytical Chemistry
Non-destructive molecular FTIR spectromicroscopy for real time assessment of redox metallodrugs
Micro-FTIR imaging has opened new possibilities for investigating in situ drug release, redox chemistry effects with biological molecules, DNA and drug interactions, membranes dynamic, and redox reaction with proteins at the single cell level.
The emerging role of 3D-printing in ion mobility spectrometry and mass spectrometry
3D-printing enables the rapid prototyping of ion mobility (IMS) and mass spectrometry (MS) gadgets. The RepRap components are suitable for building cost-efficient robots and MS imaging systems. In this review, we present current trends.
Recent advances in electroanalytical drug detection by porphyrin/phthalocyanine macrocycles: developments and future perspectives
Porphyrins and phthalocyanines used to construct sensors for electroanalytical drug detection.
Recent progress in chemosensors based on pyrazole derivatives
This review provides an overview on the recent (2016–2020) findings on chemosensors based on pyrazole derivatives. The discussion focuses on the design, physicochemical properties and practical applications of probes.
Aerosol dilution for the introduction of complex matrix samples in plasma-based spectrometry techniques: a tutorial review
Aerosol dilution (AD) is a sample introduction tool that allows the direct analysis of complex matrix samples by plasma-based analytical techniques.
Is MIP-OES a suitable alternative to ICP-OES for trace element analysis?
New developments in instrumentation, plasma diagnostics, calibration, and sample preparation applied to MIP-OES may make it competitive with ICP-OES.
Microfluidic devices based on textile threads for analytical applications: state of the art and prospects
Critical review on the fundamentals, applications, challenges, and prospects of thread-based microfluidic analytical devices.
Determination of antimalarial drugs in pharmaceutical formulations and human blood by liquid chromatography: a review
The evolution of different analytical methods that have been applied to the determination of antimalarial drugs in pharmaceutical formulations and human blood by liquid chromatography.
Commercially available rapid diagnostic tests for the detection of high priority pathogens: status and challenges
Rapid diagnostic tests (RDTs) will provide a key element of disease surveillance. Their rapid turnaround, low cost, and accessibility in resource limited areas will help increase public health reporting and facilitate outbreak containment.
Current advances in the detection of COVID-19 and evaluation of the humoral response
SARS-CoV-2 and humoral response determinations to understand and control the spread of COVID-19.
Distribution of pesticides in agricultural and urban soils of Brazil: a critical review
The extensive use of pesticides leads to soil contamination and is harmful to environmental health.
Diffuse reflectance infrared Fourier transform spectroscopy for a qualitative evaluation of plant leaf pigment extraction
The extraction and quantification of leaf pigments are easy, fast, and cheap procedures; on the other hand, DRIFT spectroscopy associated with chemometrics tools could offer new insights into leaf biochemical composition.
Detection of the SARS-CoV-2 spike protein in saliva with Shrinky-Dink© electrodes
We introduce a simple, scalable, and portable electrochemical aptamer-based system for detection of the SARS-CoV-2 spike protein in saliva with attomolar sensitivity.
Colorimetric loop-mediated isothermal amplification (LAMP) for cost-effective and quantitative detection of SARS-CoV-2: the change in color in LAMP-based assays quantitatively correlates with viral copy number
Colorimetric LAMP for COVID-19 intensified diagnostics: a simple and quantitative method comparable in diagnostic performance to RT-qPCR.
Simultaneous detection of dopamine and ascorbic acid by using a thread-based microfluidic device and multiple pulse amperometry
This study presents a novel approach for the simultaneous detection of ascorbic acid (AA) and dopamine (DA) using an affordable and user-friendly microfluidic device.
A novel online dispersive liquid–liquid microextraction for the spectrophotometric determination of free glycerol in biodiesel
Accurate and precise online extraction and determination of free glycerol in biodiesel exploiting pulsed flows.
Factorial design applied to LC-ESI-QTOF mass spectrometer parameters for untargeted metabolomics
Experimental design as an optimization protocol of mass spectrometry parameters towards the acquisition of high quality datasets for metabolomics-driven investigations.
A conventional and chemometric analytical approach to solving urea determination with accuracy and precision
Urea is an essential molecule usually detected using spectroscopy, particularly ultraviolet and visible spectroscopy (UV-vis).
Discrimination of Robusta Amazônico coffee farmed by indigenous and non-indigenous people in Amazon: comparing benchtop and portable NIR using ComDim and duplex
To meet the substantial trend towards NIR spectroscopy miniaturization, this work compared benchtop and portable NIR instruments to discriminate Robusta Amazônico samples using partial least squares discriminant analysis (PLS-DA).
Electrochemical detection of mephedrone using a graphene screen-printed electrode: a new sensitive and selective approach to identify synthetic cathinones in forensic analysis
We present the electrochemical detection of mephedrone in forensic samples using independent redox processes of synthetic cathinones on a graphene screen-printed electrode.
Mixture design of an electrolyte system for the simultaneous separation of Cl−, SO42−, NO3−, NO2−, and HCO3− in shrimp-farming water by CZE-UV
Simultaneous determination of Cl−, NO2−, NO3−, SO42−, and HCO3− in shrimp-farming water samples by CZE-UV using dilution as sample pretreatment step. Mixture design was used to optimize the composition of the electrolyte background.
ANN-LIBS analysis of mixture plasmas: detection of xenon
We developed an artificial neural network method for characterising crucial physical plasma parameters (i.e., temperature, electron density) in a fast and precise manner that mitigates common issues arising in evaluation of LIBS spectra.
An ion imprinted magnetic organosilica nanocomposite for the selective determination of traces of Cd(II) in a minicolumn flow-through preconcentration system coupled with graphite furnace atomic absorption spectroscopy
This work presents for the first time the use of ion-imprinted magnetic materials in a simple and novel flow-through magnetic preconcentration system applied to the determination of ultratraces of cadmium ions in water coupled to GFAAS.
Synthesis and evaluation of a Zn–Al layered double hydroxide for the removal of ochratoxin A. Greenness assessment
The retention behavior of a dangerous toxin, ochratoxin A (OTA), present in food samples and derivatives was evaluated using Layered Double Hydroxides (LDHs).
Analysis of sugars and sweeteners via terahertz time-domain spectroscopy
The potential of THz spectroscopy in the development of analytical applications for saccharide identification.
Paper-based colorimetric sensor array for the rapid and on-site discrimination of green tea samples based on the flavonoid composition
An alternative yet powerful methodology based on the colorimetric sensor array concept to distinguish green tea extract through the flavonoid composition.
Laser ablation-ICP-mass spectrometry for determination of the concentrations and spatial distributions of bromine and iodine in human hair
Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) was applied for the determination of Br and I in hair strands of human individuals under treatment with synthetic thyroid hormones.
Direct analysis of tree rings using laser ablation-ICP-MS and quantitative evaluation of Zn and Cu using filter paper as a solid support for calibration
This work aims to study and apply filter paper as calibration solid supports, in order to avoid matrix and fractionation effects, for the quantification of two essential elements of trees, Cu and Zn, in tree-ring samples, using LA-ICP-MS.
Preconcentration of sulphonamides in bovine milk by the cloud point extraction method using smartphone-based digital images
The procedure does not require organic solvents and is based on easy CPE of sulphonamides from milk samples. Established limits for total sulphonamides in milk were met using digital images.
Linking the chemical composition and optical properties of biomass burning aerosols in Amazonia
The absorption efficiency of chemically resolved organic aerosols of Southwestern Amazonia showed strong spectral dependence and significant light absorption in the UV-vis wavelength range indicating the presence of organic species that act as BrC.
Development of an eco-friendly sample preparation protocol for metal determination in food samples: an oxygen pressurized single reaction chamber using diluted nitric acid
A single reaction chamber microwave-assisted wet digestion system using O2 as an auxiliary reagent and diluted HNO3 for multisample digestion and metal determination.
Direct analysis of naphthenic acids in produced water and crude oil by NH2-surface-modified wooden-tip electrospray ionization mass spectrometry
An NH2-surface-coated wooden-tip electrospray ionization mass spectrometry method was developed for naphthenic acid analysis in water samples.
Simultaneous analysis of multiple adulterants in milk using microfluidic paper-based analytical devices
This study reports the simultaneous colorimetric detection of urea, H2O2, and pH in milk samples using microfluidic paper-based analytical devices (μPADs) fabricated through a craft cutter printer.
Micro flow injection analysis of leucomalachite green in fish muscle using modified henequen fibers as microfluidic channels
In this work a simple and novel procedure for leucomalachite green determination based on micro flow injection analysis (μFIA) with amperometric detection is presented.
High-efficiency photoreductive vapor generation of osmium
Photochemical vapor generation of Os. OsO4 oxidative product from photolysis of 5% HNO3 medium; reductive product from 1% acetic acid/50 mg L−1 Fe3/2+ an uncharacterized organometallic Os compound [Osw(CO)x(CH3)yHz] detected by ICP-MS.
Electrokinetic elucidation of the interactions between persistent luminescent nanoprobes and the binary apolipoprotein-E/albumin protein system
The interactions between NPs and a binary system of proteins were studied through a systematic set of capillary electrophoresis models. The results revealed precise details of the soft and hard protein corona formation and dynamics.
Can a field molecular diagnosis be accurate? A performance evaluation of colorimetric RT-LAMP for the detection of SARS-CoV-2 in a hospital setting
We developed a molecular test for the detection of SARS-CoV-2 directly from swab samples. The test is based on colorimetric RT-LAMP, with results comparable to the gold standard method (RT -qPCR), performed in a hospital and laboratory environment.
Emerging investigator series: a multispecies analysis of the relationship between oxygen content and toxicity in graphene oxide
The relationship between oxygen content and toxicity in graphene oxide varies between species.
On line kinetic analysis of permeation profiles for UV filter loaded microemulsions using an automatic system with spectroscopic detection and a chemometric approach
On-line and green automatic methods with spectrophotometric detection were developed to the obtention of permeation kinetic constants of octyl p-methoxycinnamate in o/w microemulsions. The effect of interferences was overcome using chemometric tools.
3D-printing for forensic chemistry: voltammetric determination of cocaine on additively manufactured graphene–polylactic acid electrodes
Cocaine is probably one of the most trafficked illicit drugs in the world.
Quantification and risk assessment of pesticides in southern Brazilian air samples using low-volume sampling and rapid ultrasound-assisted extraction
Two gas phase sampling systems were validated and compared to each other. The levels of pesticides ranged between 192 and 1731 pg m−3. Human exposure to pesticides was estimated using the gas phase concentrations.
A novel all-3D-printed thread-based microfluidic device with an embedded electrochemical detector: first application in environmental analysis of nitrite
A fully 3D-printed microfluidic thread-based device containing an embedded electrochemical detector is first reported. A green method based on microflow injection analysis for sensing of nitrite ions in environmental samples is also first presented.
Rapid molecular diagnostics of COVID-19 by RT-LAMP in a centrifugal polystyrene-toner based microdevice with end-point visual detection
We developed a low-cost molecular test for the diagnosis of COVID-19, in a centrifugal microdevice, based on RT-LAMP assay run at 72 °C for 10 min.
Accurate location of hydrogen atoms in hydrogen bonds of tizoxanide from the combination of experimental and theoretical models
In this work, we present a combination of ssNMR spectroscopy and two different theoretical methods to get a full description of an intramolecular hydrogen bond in tizoxanide.
Emerging investigator series: emerging disinfection by-product quantification method for wastewater reuse: trace level assessment using tandem mass spectrometry
A sensitive analytical method was developed that simultaneously characterizes 25 unregulated DBPs in wastewater effluents. DBP formation potential with HOCl and NH2Cl was evaluated across a full-scale wastewater reuse facility for the first time.
A spot test for direct quantification of acid green 16 adsorbed on a molecularly imprinted polymer through diffuse reflectance measurements
This work describes a novel technique for the direct quantification of Acid Green 16 (AG16) adsorbed on a molecularly imprinted polymer (MIP) through the application of diffuse reflectance spectrophotometry (DRS) directly in a slid material.
Near-canopy horizontal concentration heterogeneity of semivolatile oxygenated organic compounds and implications for 2-methyltetrols primary emissions
This study calls attention to the primary emissions of semivolatile oxygenated organic compounds (SV-OVOCs) and demonstrates how mapping out the near-canopy concentration can effectively isolate atmospheric SV-OVOC production from direct emissions.
Obtaining an immunoaffinity monolithic material: poly(GMA-co-EDMA) functionalized with an HPV-derived peptide using a thiol–maleimide reaction
In this investigation, an organic monolithic material of poly(GMA-co-EDMA) was functionalized with a peptide via Michael addition chemistry for isolating and pre-concentrating antibodies.
One-step enzyme-free dual electrochemical immunosensor for histidine-rich protein 2 determination
One-step enzyme-free dual electrochemical immunosensor for Malaria biomarker determination.
Boron Schiff bases derived from α-amino acids as nucleoli/cytoplasm cell-staining fluorescent probes in vitro
Boron Schiff bases derived from amino acids show nucleoli and cytoplasm staining fluorescent probes with good photostability and low cytotoxicity, which make them candidates to be used in medical diagnosis.
Identifying patterns and sources of anthropogenic trace metals in the Argentine Central Andes by using snow samples and an atmospheric dispersion model
This study presents the first local measurements of metals in snow from the Argentine Central Andes.
N-doped oxidized carbon dots for methanol sensing in alcoholic beverages
Herein, we establish a new perspective towards economically viable non-toxic fluorescent probes as a potential substitute of expensive alternative for the detection of MeOH in alcoholic beverages.
New, inexpensive and simple 3D printable device for nephelometric and fluorimetric determination based on smartphone sensing
A new, inexpensive and easy to use 3D printable device was developed for nephelometric and fluorimetric determination.
Standard dilution analysis (SDA) as a powerful tool for elemental determination in biodiesel by inductively coupled plasma optical emission spectrometry (ICP OES)
Standard Dilution Analysis (SDA) as a more environmentally friendly and time saving calibration method for multielement determination in biodiesel by ICP OES.
Ultra-trace Hg determination in crude oils by CV-ICP-MS: overcoming the limitations of sample preparation to determine sub-ppb levels
A method was developed to determine Hg in crude oil at sub-ppb levels by cold vapor generation inductively coupled plasma mass spectrometry (CV-ICP-MS) after wet digestion in a microwave-assisted system with a pressurized cavity.
Rapid evaporative ionization mass spectrometry (REIMS) combined with chemometrics for real-time beer analysis
The beer industry plays an important role in the economy since this is the third most consumed beverage worldwide.
Optimized preconcentration method using magnetic dispersive solid-phase microextraction with GO–γFe2O3 nanoparticles for the determination of Se in fish samples by FIA-HG-AAS
Magnetic nanoparticles of GO–γ-Fe2O3 were applied for the preconcentration of Se in fish samples and determination by hydride generation atomic absorption spectrometry and flow injection analysis.
About this collection
Ahead of the 20th Brazilian Meeting on Analytical Chemistry, we are delighted to present a collection of articles showcasing some of the top analytical chemistry research from Brazil and Latin America.
This cross-journal collection highlights a broad range of research from the last couple of years. We hope you enjoy reading the articles included in this collection.