A5035045048- Toxic Organic Pollutants Impact
- Microplastics and Plastic Pollution
- Pesticide Residue Analysis and Safety
- Forensic Toxicology and Drug Analysis
- Advanced Chemical Sensor Technologies
- Air Quality and Health Impacts
- Analytical chemistry methods development
- Analytical Chemistry and Chromatography
- Vehicle emissions and performance
- Dye analysis and toxicity
- Indoor Air Quality and Microbial Exposure
- Environmental Chemistry and Analysis
- HIV, Drug Use, Sexual Risk
- Metabolomics and Mass Spectrometry Studies
- Helminth infection and control
- Antibiotics Pharmacokinetics and Efficacy
- Water Quality Monitoring and Analysis
- Melamine detection and toxicity
- Spectroscopy and Chemometric Analyses
- Microbial bioremediation and biosurfactants
- Pharmaceutical and Antibiotic Environmental Impacts
- Biochemical Analysis and Sensing Techniques
- Heavy metals in environment
- Microfluidic and Capillary Electrophoresis Applications
- Identification and Quantification in Food
Universidade Federal Fluminense
2014-2023
Universidade Federal do Amazonas
2023
Anthrologica
2023
Universidade Federal do Estado do Rio de Janeiro
2021-2022
Instituto Nacional de Matemática Pura e Aplicada
2015-2017
Universidade do Porto
2015
Fundação Oswaldo Cruz
2014
Universidade Federal do Rio de Janeiro
1982
The Kjeldahl method and four classic spectrophotometric methods (Biuret, Lowry, Bradford Markwell) were applied to evaluate the protein content of samples UHT whole milk deliberately adulterated with melamine, ammonium sulphate or urea, which can be used defraud whey contents. Compared method, response was unaffected by addition nitrogen compounds whey. Markwell most robust did not exhibit interference subject composition. However, simultaneous interpretation results obtained using these...
Triacylglycerols (TAGs) are the main constituents of vegetable oils where they occur in complex mixtures with characteristic distributions. Mass spectrometry using an atmospheric pressure chemical ionization interface (APCI-MS) run positive mode and Ion Trap mass analyser were applied study olive soybean their mixtures. Direct injections oil solutions allowed identification ions derived from TAGs both oils. This procedure showed to be a simple powerful tool evaluate or addition oil. TAG...
OF METH-ODOLOGY.Polycyclic aromatic hydrocabons (PAHs) and their nitroderivatives (NPAHs) are ubiquitous in the environment they produced several industrial combustion processes.Some of these compounds potent carcinogens/mutagens determination biological samples is an important step for exposure control.A review analytical methodologies used PAHs metabolites presented.
The interest in charcoal for agricultural use (biochar) has sharply increased recent years. However, biochar can contain groups of compounds such as polycyclic aromatic hydrocarbons (PAHs) that are considered persistent pollutants, and formed concomitantly with during its production by pyrolysis. Soil samples were collected three experimental areas at different intervals (1, 3, 5 or 6 years) after the application 16 Mg ha-1 biochar. total concentrations PAHs; benzo[a]pyrene; estimated cancer...
A simple and low-cost multipurpose analytical method using HPLC-UV-DAD was developed validated, following international guidelines, for the determination of six synthetic food dyes: Tartrazine, Sunset Yellow, Amaranth, Allura Red, Indigotine, Brilliant Blue. The required a sample preparation step that consisted dissolution or dilution samples in water, followed by pH adjustment filtering through PVDF filters. No significant matrix effect verified. Linear working ranges varied from 0.25 to 6.0 mg L
Background: QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) is a methodology previously developed to extract pesticides from vegetables fruits has been fully applied for different analytical approaches. Keywords: Opioids, drugs of abuse, QuEChERS, whole blood, GC-EI/MS, clinical forensic toxicology.
A HPLC-UV method has been developed and validated for the determination of ascorbic acid in chicken embryo retina.
This present work reports a multivariate optimization of spectrophotometric method for copper determination in sugar-cane spirits, exploring the reaction Cu(II) with phenylfluorone (PF) presence cetylpyridinium chloride (CPC) and Triton X-100. The strategy was based on application two-level full factorial design screening significant variables followed by Doehlert to determine optimum conditions. highest sensitivity achieved when pH 8.0 PF TX-100 concentrations were 6.2 × 10− 5 1.0 2 mol L−...
Aldehydes and ketones are volatile organic compounds (VOC) emitted into the atmosphere by a large number of natural anthropogenic sources. Carbonyl (CC) atmospheric pollutants with known damaging effects for human’s health. In this work, separation 31 carbonyl in their 2,4-dinitrophenylhydrazones form was optimized rapid resolution liquid chromatography 9 minutes simultaneously detected ultraviolet mass spectrometry an APCI(−) as ionization source. The spectra hydrazones presented [M-H] −...
Formaldehyde has been illegally added to milk reduce microbial activity and extend the shelf life of product. In Brazil, official method for formaldehyde detection in consists a qualitative colorimetric analysis. This work aimed develop more sensitive method, based on Micellar Electrokinetic Chromatography with Diode Array Detection (MEKC-UV/DAD), determine bovine milk. Sample preparation consisted derivatization 2,4-dinitrophenylhydrazine followed by protein precipitation extraction...
The first application of LLE-PBT for determination chloramphenicol in milk.