A5032147301- Pesticide Residue Analysis and Safety
- Analytical chemistry methods development
- Analytical Chemistry and Chromatography
- Pesticide and Herbicide Environmental Studies
- Environmental Sustainability and Education
- Science and Education Research
- Pharmacological Effects and Assays
- Chemistry Education and Research
- Environmental Toxicology and Ecotoxicology
- Pesticide Exposure and Toxicity
- Antibiotics Pharmacokinetics and Efficacy
- Insect and Pesticide Research
- Pharmaceutical and Antibiotic Environmental Impacts
- Mass Spectrometry Techniques and Applications
- Helminth infection and control
- Spectroscopy and Chemometric Analyses
- Education Pedagogy and Practices
- Analytical Methods in Pharmaceuticals
- Analytical Chemistry and Sensors
- Coccidia and coccidiosis research
- Advanced Chemical Sensor Technologies
- Dye analysis and toxicity
- Science and Science Education
- Education and Digital Technologies
- Animal Nutrition and Physiology
Universidade Federal de Santa Maria
2014-2023
Universidade Estadual Paulista (Unesp)
2021
Instituto de Ciências Farmacêuticas
2021
Ave Maria University
2021
Shanghai Pesticide Research Institute
2014
Rede de Química e Tecnologia
2008
Johannes Gutenberg University Mainz
2005
Universidade Estadual de Campinas (UNICAMP)
1999
In this study, different extraction procedures based on the QuEChERS method were compared for multiresidue determination of pesticides in orange juice by ultra high performance liquid chromatography coupled to tandem mass spectrometry (UHPLC–MS/MS). After choosing preliminary conditions, an experimental design was carried out with variables C18, PSA, NaOH and CH3COONa optimize sample preparation step. The validation results satisfactory, since presented recoveries between 70% 118%, RSD lower...
Drawing the students’ attention and keeping them engaged are essential points to learning process. Active methodologies place students at center of this process make protagonists discovery, rather than just passive information receivers. There different teaching strategies create an active environment engage it. Current evidences indicate that improves understanding retention. It is also effective in developing higher-order cognitive skills. Nevertheless, adoption still low. The authors...
In this work, a method for multiclass determination of 70 pesticides residues with different properties in drinking water using solid phase extraction (SPE) polymeric sorbent and by gas liquid chromatography coupled to tandem mass spectrometry (GC-MS/MS LC-MS/MS) was developed validated.Different sample volumes, sorbents elution solvents were evaluated.The best results obtained the Oasis ® HLB, acidified at pH 2.5 mixture dichloromethane/methanol as eluent.The limit quantification (LOD) 0.02...
An effective method has been developed and validated for the determination of residues 55 pesticides in tobacco. The proposed sample preparation is based on acetonitrile extraction, low-temperature precipitation (LTP) dispersive solid phase extraction (d-SPE) clean-up. Gas chromatography ultra-high performance liquid analysis, both coupled to tandem mass spectrometry (GC-MS/MS UHPLC-MS/MS), were used determination. LTP easy perform was crucial obtain a clean extract. Method quantification...
Endocrine Disrupter Compounds (EDCs) are responsible for alterations in the endocrine system functions. Aquatic organisms able to accumulate EDCs residues, being major source of contamination top predators and human consumers. This study aimed develop validate a method determination 40 fish fillet using modified QuEChERS Gas Chromatography coupled with Mass Spectrometry tandem (GC-MS/MS). A factorial design was used optimize extraction procedure. Method validation presented recoveries from...
An effective method based on a modified quick, easy, cheap, effective, rugged, and safe sample preparation step determination by LC with MS/MS has been developed validated for the simultaneous of pesticides different characteristics in soil samples. Several parameters that affect extraction analysis were studied proposed was using spiked blank Recoveries herbicides clomazone, imazapic imazethapyr, insecticides fipronil thiamethoxam, fungicides propiconazole trifloxystrobin from samples at...
Este artigo apresenta uma visão atualizada do método QuEChERS para extração multiresíduo, que envolve inicial em acetonitrila, etapa de partição após a adição sal e limpeza utilizando fase sólida dispersiva
In this work, a method using solid-phase extraction and gas chromatography coupled mass spectrometry in the selective ion monitoring (SIM) mode was developed validated for multi-class determination of 20 pesticides regulated by Brazilian legislation drinking water. Because these must be determined at low concentrations, high preconcentration factor associated to sensitivity chromatographic analysis necessary. The presented quantification limits between 0.003 0.093 µg L-1. Most compounds mean...
O mel pode apresentar resíduos de pesticidas devido à contaminação das abelhas durante a coleta pólen e néctar ou por tratamento colmeias.Assim, determinação em é grande importância, apesar da dificuldade complexidade matriz.Neste estudo, um novo método para diferentes grupos químicos foi desenvolvido validado.Amostras foram extraídas pelo QuEChERS modificado analisados cromatografia gasosa com detecção captura elétrons (GC-ECD).Os resultados recuperação, avaliados três níveis fortificação,...
A miniaturized sample preparation method was developed and validated for the multiresidue determination of 97 pesticides in wine samples.