A5005970297- Pesticide Residue Analysis and Safety
- Analytical chemistry methods development
- Pharmacological Effects and Assays
- Insect and Pesticide Research
- Water Quality Monitoring and Analysis
- Bee Products Chemical Analysis
- Analytical Chemistry and Chromatography
- Analytical Chemistry and Sensors
- Scientific Measurement and Uncertainty Evaluation
- Dye analysis and toxicity
- Enzyme Catalysis and Immobilization
- Pesticide and Herbicide Environmental Studies
- Pesticide Exposure and Toxicity
- Soil Science and Environmental Management
- Chemical Thermodynamics and Molecular Structure
- Microbial Metabolic Engineering and Bioproduction
- Water Quality and Pollution Assessment
- Advanced Chemical Sensor Technologies
- Smart Materials for Construction
- Plant and soil sciences
- Chemical Synthesis and Characterization
- Chemistry and Chemical Engineering
- Radioactive Decay and Measurement Techniques
- Microfluidic and Capillary Electrophoresis Applications
- Agricultural safety and regulations
Universidad Nacional de Colombia
2010-2025
Universitat de Barcelona
2025
Instituto Nacional de Metrología de Colombia
2012-2022
Universidad de Santiago de Chile
2018-2021
Universidad Bernardo O'Higgins
2021
Instituto Nacional de Metrologia, Qualidade e Tecnologia
2019
Universidad de Bogotá Jorge Tadeo Lozano
2011-2013
Abstract Reference materials (RMs) and certified reference (CRMs) are essential for ensuring compliance of food products with international standards. In fish, mercury content is closely monitored due to associated human health risks. This study developed a CRM total (Hg) methylmercury (MeHg) in striped catfish ( Pseudoplatystoma fasciatum ) from the Colombian Amazon. The process involved raw material selection, sample preparation, homogeneity, stability, resulting INM-039–1. Total Hg was...
Microbes are suitable candidates to recover and decontaminate different environments from soluble metal ions, either via reduction or precipitation generate insoluble, non-toxic derivatives. In general, microorganisms reduce toxic ions generating nanostructures (NS), which display great applicability in biotechnological processes. Since the molecular bases of bacterial still unknown, search for new -environmentally safe less expensive- methods synthesize NS have made biological systems...
Este trabalho apresenta os resultados da validacao de um metodo simples, rapido e baixo custo preparacao amostras para a determinacao residuos pesticidas em solo por cromatografia liquida ultrarrapida acoplada espectrometria massas com ionizacao electrospray. O se baseia na extracao acetonitrila assistida ultrassom, centrifugacao evaporacao, sem etapa purificacao adicional. As recuperacoes foram avaliadas partir dois tipos solo, apresentando faixa 70-110%, desvio padrao relativo menor que...
In this work a study of several variables that affect the matrix effects (ME) was performed. The choice given among four extraction solvents and different clean-up methods which were compared in order to find method produces least ME gives highest response for 18 compounds. Variability under identical chromatographic conditions five fruits also studied. Finally we evaluated analyte/matrix ratios assess ME. results showed significantly better responses (P < 0.05) achieved by using mixture...
The enzymatic synthesis of short-tailed alkyl glucosides is generally carried out in an aqueous-organic biphasic reaction medium with a rather low fatty alcohol concentration the aqueous phase (where occurs). Thus, hydrolytic reactions have significant impact on performance. Given this background, use acetone as cosolvent was studied for butyl-β-galactoside Aspergillus oryzae β-galactosidase. liquid-liquid equilibrium mixture components (acetone/1-butanol/aqueous solution) determined and...
Abstract Titrations are a group of techniques that have contributed considerably to developing the chemical industry and chemistry itself. Currently, Consultative Committee for Amount Substance has recognized titration as one primary methods determining amount substance. In this context, an accurate gravimetric complexometric method was implemented determine purity ethylenediaminetetraacetic acid (EDTA) disodium salt dihydrate using lead nitrate-certified reference material (CRM). The...
Liver plays a major role in metabolism and acts as source of energy for the body by storing glycogen. With growing interest investigation biological effects recent years, it is important necessary to develop accurate comparable analytical methods elements bio-samples. It has, however, been 10 years since tissue sample (bovine liver) CCQM-K49 key comparison. The purpose CCQM-K145 ensure traceable measurement results essential toxic such P, S, Zn, Mn, Ni, Mo, Sr, Cr, Co, Pb, As Hg bovine liver...
SIM.QM-S7 was performed to assess the analytical capabilities of National Metrology Institutes (NMIs) and Designated (DIs) SIM members (or other regions) for accurate determination trace metals in drinking water. The study proposed by coordinating laboratories Research Council Canada (NRC) Centro Nacional de Metrologia (CENAM) as an activity Inorganic Analysis Working Group (IAWG) Consultative Committee Amount Substance - Chemistry Biology (CCQM). Participants included 16 NMIs/DIs from 15...
Pesticide quantitation in foods relies on the availability of matrix reference materials, which, however, are scarce because general instability pesticides. In particular, no avocado material has been developed.This research aimed to develop a support determination pesticide residues avocado.Avocado was spiked with 11 selected pesticides at levels 0.01-0.35 mg/kg. The production process included assessment between-unit heterogeneity, stability during dispatch, and best storage conditions...
After completing a supplementary comparison SIM.QM-S7, the National Metrology Institute of Colombia (NMIC) requested to Research Council Canada (NRC) subsequent bilateral comparison, because INMC considered that its results in SIM.QM-S7 unrepresentative standards. In this context, NRC agreed coordinate with aim demonstrating measurement capabilities trace elements fresh water. Participants included NMIC and LATU. No method was prescribed by coordinating laboratory. Therefore, NMIs used...
Main text The CCQM key comparison K73.2018 is a follow-up of CCQM-K73. It was performed to demonstrate the capability participating institutes measure amount content H + in hydrochloric acid 0.1 mol·kg −1 molality. 16 NMIs participated this comparison. coordinated by PTB. sample showed slight but significant instability loss water around 0.11 μmol kg d corresponding 0.02 % over measurement period. Therefore, results were corrected for instability. show good equivalence between majority...
CCQM key comparison K-149 in the field of nitrogen mass fraction milk powder has been performed by Inorganic Analysis Working Group (IAWG) Consultative Committee for Amount Substance (CCQM). The aim this CCQM-K149 is to support National Measurement Institutes (NMIs) and Designated (DIs) demonstrate validity procedures they employed determination powder. Mass a very important pointer because results these measurements are often used protein that an indicator quality vast majority food...
A method for quantification of arsenic, cadmium, mercury, and lead in pineapple using inductively coupled plasma-mass spectrometry (ICP-MS) was developed, validated, used to test the homogeneity stability in-house reference materials.The tested at regulation levels given by Food Agriculture Organization United Nations (FAO, 100 µg kg -1 ).The mineralization conditions samples, a microwave oven, were improved throughout study HNO 3 H 2 O concentrations, sample weight, time, temperatures.The...