A5052255656- Analytical chemistry methods development
- Electrochemical Analysis and Applications
- Heavy Metals in Plants
- Analytical Chemistry and Chromatography
- Mass Spectrometry Techniques and Applications
- Analytical Chemistry and Sensors
- Coffee research and impacts
- Heavy metals in environment
- Electrochemical sensors and biosensors
- Phytochemicals and Antioxidant Activities
- Pesticide Residue Analysis and Safety
- Plant Physiology and Cultivation Studies
- Radioactive element chemistry and processing
- Agricultural and Food Sciences
- Complementary and Alternative Medicine Studies
- Postharvest Quality and Shelf Life Management
- Environmental Chemistry and Analysis
- Spectroscopy and Chemometric Analyses
- Chemical Synthesis and Characterization
- Bee Products Chemical Analysis
- Forensic Toxicology and Drug Analysis
- Seed and Plant Biochemistry
- Analytical Methods in Pharmaceuticals
- Advanced Chemical Sensor Technologies
- Pharmaceutical and Antibiotic Environmental Impacts
Universidade Estadual de Londrina
2014-2020
A supramolecular solvent-based microextraction procedure for preconcentration of four most common sugarcane herbicides (diuron, hexazinone, ametryn and tebuthiuron) from groundwater surface water samples with further determination by High Performance Liquid Chromatography Photodiode Array detector (HPLC-DAD) is proposed. The proposed method involves the use a solvent in which reverse micelles 1-decanol are dispersed tetrahydrofuran/water. extraction performed at pH 4.0 requires low sample...
A new analytical method exploiting supramolecular solvent-based microextraction (SUPRAS) combined with ultrasound-assisted extraction to preconcentrate cadmium from medicinal plant, further determination by thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS), is proposed. The proposed based on the Ginkgo biloba L. leaf samples diluted acid (0.10 mol L−1 HNO3), followed metal complexation diethyl dithiophosphate and preconcentration using a solvent composed of inverted...
The effects of hydric stress and sunlight access conditions on metabolic compounds in coffee leaves were investigated utilizing statistical mixture design extractor solvents. PCA OSC–PLS–DA chemometric methods used to analyze UV–visible spectra irrigated non-irrigated Coffea arabica L. from low (<40 cm, self-shaded) higher (>80 light exposed) strata. first latent variable the score plot perfectly discriminated extracts 34 calibration 14 validation samples leaves. Higher spectral signals...
Abstract A new voltammetric sensor based on molecularly imprinted poly(acrylic acid)‐MWCNT nanocomposite (MIP‐MWCNT) drop‐coated onto glassy carbon electrode (GCE) was developed and applied to tramadol (TR) determination in pharmaceutical samples. The prepared by suspension of MIP‐MWCNT at 1 : (w/w) ratio show an improved performance compared unmodified GCE. electrochemical method is preconcentration modified GCE surface −1.5 V vs Ag/AgCl for 180 s 0.1 Britton‐Robinson buffer (pH 8.0)...
Coffee bean chemical compositions has been extensively studied.However, there is a small amount of research on other parts the coffee plant, including leaves.Fourier transform infrared (FTIR) spectral profiles Coffea arabica L. cv.IAPAR 59 leaf extracts from simplex-centroid design were studied by principal component analysis (PCA) to evaluate effect solvent extractor its metabolites.PCA indicated that solvents containing ethanol most suitable for this study.FTIR spectra in conjunction with...
TRIGONELLINE IN Coffea arabica.In this research work the effects of four solvents and their mixtures on extraction chlorogenic acids, caffeine trigonelline in crude extracts coffee cultivars, traditional red bourbon, IAPAR59, IPR101 IPR108 were investigated by UV spectrophotometry spectra obtained from RP-HPLC-DAD.The experimental results principal component analysis showed that effect solvent metabolites does not depend because spectral characteristics are similar, but concentrations...
A new online solid phase preconcentration method using the SiO 2 /Al O 3 /SnO ternary oxide (designated as SiAlSn) chelating agent free-solid extractor (CAF-SPE) coupled to flame atomic absorption spectrometry (FAAS) for Pb 2+ determination at trace levels in different kind of samples is proposed.The adsorbent has been characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron miscroscopy (SEM), energy dispersive X-ray (EDS), fluorescence (XRF) and textural data.The...