A5019067011- Spectroscopy and Chemometric Analyses
- Electrochemical Analysis and Applications
- Water Quality Monitoring and Analysis
- Analytical chemistry methods development
- Pesticide Residue Analysis and Safety
- Dye analysis and toxicity
- Electrochemical sensors and biosensors
- Analytical Methods in Pharmaceuticals
- Advanced Chemical Sensor Technologies
- Conducting polymers and applications
- Analytical Chemistry and Chromatography
- Spectroscopy Techniques in Biomedical and Chemical Research
- X-ray Spectroscopy and Fluorescence Analysis
- Metabolomics and Mass Spectrometry Studies
- Advanced Photocatalysis Techniques
- Phytochemicals and Antioxidant Activities
- Pharmaceutical and Antibiotic Environmental Impacts
- Radioactive element chemistry and processing
- Chemistry and Chemical Engineering
- Isotope Analysis in Ecology
- Antibiotics Pharmacokinetics and Efficacy
- TiO2 Photocatalysis and Solar Cells
- Nanomaterials for catalytic reactions
- Insect and Pesticide Research
- Fermentation and Sensory Analysis
Universidade Federal do Paraná
2015-2024
Universidade Estadual de Ponta Grossa
2005-2014
Universidade Estadual de Campinas (UNICAMP)
1997-2001
Summary The aim of this work was to develop a fast, versatile, inexpensive and environmentally safe analytical method quantify simple sugars, malic acid total phenolic compounds in apple pomace, considering its potential use as raw material with value instead an industrial waste. Diffuse reflectance infrared spectroscopy (DRIFTS) measurements twenty‐six samples pomace were analysed by partial least squares regression (PLSR), using several signal pre‐processing methods. Multivariate models...
This work evaluated the photocatalytic activity of suspended TiO 2 , and -coated glass Raschig rings with respect to degradation estrogens estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2) in aqueous solutions wastewater effluent samples.Gas chromatography/tandem mass spectrometry (GC-MS/MS) studies were carried out identify products for EE2.TiO suspensions allowed rates higher than 90% all studied 30 min an artificial (ultraviolet A) UVA-assisted process solution.Immobilized...
A sensitive high-performance liquid chromatography-fluorescence detection method (HPLC-FLD) was developed and validated for 17β-estradiol (E2) 17α-ethinylestradiol (EE2) determination in wastewater samples.Sample preparation performed by solid-phase extraction (SPE) on Hypersep C18 cartridges.Conditioning elution solvents sample volume were investigated a 2 3 factorial design both analytes.The pre-concentration factor 2500 times, allowing to quantify 5.0 ng L -1 hormones.The SPE-HPLC-FLD...
One of the main problems in quantitative analysis complex samples by x-ray fluorescence is related to interelemental (or matrix) effects.These effects appear as a result interactions among sample elements, affecting emission intensity non-linear manner.Basically, two occur; absorption and enhancement.The combination these can lead serious problems.Many studies have been carried out proposing mathematical methods correct for effects.Basic concepts correction are discussed here.
Normalmente, estudos que objetivam a otimização de variáveis experimentais são realizados através procedimentos avaliam o efeito uma variável por vez, que, maneira geral, impede estabelecimento ótimos verdadeiros, em razão da freqüência com as se apresentam altamente correlacionadas. Neste trabalho, algumas aplicações práticas apresentadas, visando demonstrar conveniência dos multivariados otimização, principalmente sistemas planejamento fatorial experimentos. A partir três exemplos práticos...
O método de regressão por mínimos quadrados parciais (PLSR) foi utilizado para a quantificação simultânea dois tuberculostáticos rifampicina (RIF) e isoniazida (INH) espectrofotometria na região do visível utilizando uma reação derivatização simples.Na presença neocuproína, íons cobre(II) foram facilmente reduzidos INH um complexo Cu(I)-neocuproína absorção máxima 455 nm.Sob essas mesmas condições, RIF mostrou 449 nm.O conjunto calibração estabelecido entre 8 57 mg L -1 1,5 7 INH.O aplicado...
The cetane number (CN) is one of the most important parameters regarding diesel fuel oil quality, mainly ignition properties. Traditionally, CN determination performed by a quite laborious and high-cost method on an explosion engine. On other hand, nuclear magnetic resonance (NMR) spectroscopy increasing as versatile tool for quality control in several areas, such petroleum fuels, which permits fast direct investigation samples. In this work, two NMR-based methods based multivariate...
Abstract Several herbivorous insects utilize plant chemical cues to identify hosts for feeding. The role of smell in host detection by Mahanarva spectabilis (Distant) remains largely unknown. In this study, assays were applied assess M . olfactory responses forage grasses ( Pennisetum purpureum cvs. Roxo Botucatu and Pioneiro; Panicum maximum Makueni Tanzânia; Hyparrhenia rufa cv. Jaraguá; Melinis minutiflora ; Cynodon dactylon Tifton; Brachiaria brizantha Marandú; decumbens Basilisk)....