Meeting the food needs of world's population has become a major challenge for all countries. The availability this depends on number factors, including good crop management. latter is under attack from several plant parasites, root-knot nematodes, which are sometimes responsible more than 30% losses. In study, we evaluate nematicidal properties Datura metel leaf extracts. secondary metabolites were extracted using solvents different polarity and phytochemical characterization was carried out...

<p>The fenvalerate pyrethroid insecticide was determined in various types of natural waters Senegal by means a newly-developed, simple, rapid and very sensitive photochemically-induced fluorescence (PIF) method. The PIF method optimized with respect to the irradiation time, solvent pH. obtained calibration curves yielded correlation coefficients close unity. limit detection (LOD) quantification (LOQ) values were low (LOD = 0.01–0.66 ng/ml LOQ 0.04–2.20 ng/ml, according solvent),...

<p>A direct spectrofluorimetric method for the quantitative analysis of benomyl in natural waters is described. Benomyl an instable, fluorescent fungicide that mainly decomposes into carbendazim and n-butyl-isocyanate organic aqueous solutions. The kinetics solvolysis reactions were investigated solvents (methanol acetonitrile) solvent systems, including β–cyclodextrin (β-CD), sodium dodecyl sulfate (SDS), dodecyltrimethylammonium chloride (DTAC), cetyltrimethylammonium (CTAC),...

Aromatic pesticides are toxic substances for the environment and humans. In this study, photodegradation kinetics, rate of leach ability in soils analytical determination diuron metalaxyl residues well water by liquid-liquid extraction procedure have been determined UV-visible absorption photochemically-induced fluorescence (PIF). We studied kinetics spectroscopy a second-order with lifetime values 6.0 0.5 hours was found diuron, respectively. Physicochemical parameters affecting sensitivity...

The photolysis of fenvalerate, a pyrethroid insecticide, was studied in acetonitrile by 1H nuclear magnetic resonance (NMR) and 13C NMR to identify the site bond cleavage gas chromatography-mass spectrometry (GC-MS) establish chemical structure fenvalerate photoproducts. Ultraviolet (UV) irradiation solutions performed for 18 h with solar light simulator, reaction obeyed first-order kinetics. Photolysis half-life time (t1/2) values ranged between 15.25 21.63 (mean photodegradation percentage...

A simple and sensitive thermochemically induced fluorescence (TIF) method was developed to determine deltamethrin, an insecticide which has toxic effects on human beings animals. After optimisation at different pH, temperature increased from 25 50°C. TIF is based the thermolysis transformation of naturally non-fluorescent pesticides into a fluorescent thermoproduct. The kinetics reaction investigated in water optimal pH 12 after 4 minutes heating 40°C made it possible obtain low mean...

Determination of Agmatine Rate by Spectrofluorimetric Method in Alkaline Medium: Optimization and Application on Shrimp. Khémesse Kital, Moumouny Traoré, Diégane Sarr, Moussa Mbaye, Olivier Lamine Cisse, Mame Diabou Gaye Seye, Atanasse Coly, François Delattre, Alphonse Tine Abstract In this work, a spectrofluorimetric method was developed to determine the rate agmatine (AGM) shrimp using orthophthalaldehyde (OPA) as derivatization agent. To optimize analytical results, stoichiometry...

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The photolysis and protonation mechanisms of methyl benzimidazol-2-ylcarbamate (MBC) were evaluated by determining the dipole moments pKa in ground excited states using solvatochromic correlations Förster cycle, respectively. bathochromic shift observed absorption fluorescence spectra MBC with increasing solvent polarity indicates that transitions involved are π-π*. Three methods depending on theory solvatochromism applied to estimate difference excited-state (µe) ground-state (µg) moment....

This work focuses on a phytochemical study of the mucilage contained in leaves and barks African baobab (<i>adansonia digitata L</i>). The objective this is to determine presence polyphenols derived from bark. These phenolic compounds are vital for maintaining optimal health, as they combat fats cardiovascular disease. To achieve this, we used several samples. or samples were collected three different sites: Boof Poupouye (Fatick region), Ngohé (Diourbel region)...

L\'étude a pour but de définir les types parcs agroforestiers dans le système d\'utilisation des terres constituées par champs. Les observations ont consisté en relevés végétation. Soumis à l\'analyse factorielle, ces font apparaître trois groupes champs : l\'amont, versants et plateaux. Selon espèces ligneuses dominantes, différents correspondent respectivement au parc Cordyla pinnata (Lepr. Ex A. Rich) Mild. Red. ; Pterocarpus erinaceus Poir Ficus sycomorus Del. Parkia biglobasa (Jacq.) R....

Abstract The aim of this work is to determine the thermodynamic parameters and kinetics complex formation between orthophthalaldehyde (OPA) agmatine (AGM) in an alkaline medium (pH 13). Firstly, association constant ( K a ) was determined at different temperatures (between 298 338 K) with step size 10 K. Secondly, such as standard enthalpy (Δ H °), entropy S °),and Gibbs energy ∆G were calculated, where positive value ΔH ° (+45.50 kJ/mol) found, which shows that reaction endothermic. In...

The contamination of certain food crop with aflatoxin poses a real public health problem for consumers and causes many market losses exporters. Thus, several research works are oriented in the direction developing methods to combat aflatoxinogenic fungus. This study aimed at identifying characterizing strains Aspergillus flavus A. parasiticus on groundnut, maize rice seeds grown or imported into Senegal. Four species (A. niger, tamarii, parasiticus) were isolated from incidences ranging 0...

In order to predict the fate of fluometuron in aquatic environment and assess risk that it may pose, we studied its photolysis reaction aqueous media. This was monitored by UV absorption fluorescence spectroscopy. irradiation source consisting a 254 nm mercury lamp used. The study showed is unstable under effect light radiation when irradiated water. band emission this product were at 244 325 respectively. also shows photodegradation water follows first kinetics regardless method followed....

Light effects on Carbofuran and Fluometuron: Impact natural waters. Spectrophotometric study Diegane Sarr, Cheikh Diop, Lamine Cisse, Ould H’meidy Isselmou, Moussa Mbaye, François Delattre, Oladele Oyelakin, Mame Diabou Gaye Seye, Atanasse Coly, Alphonse Tine Abstract The aim of this work is to the effect light Fluometuron in various solvents, assess their ability contaminate surface ground results show that these products are notoriously unstable under irradiation. Using water as solvent,...

The present work involved determining the chemical composition and assessing antioxidant activity of mucilage contained in baobab leaves bark. from each organ was obtained separately two beakers by extraction with ethanol acetone. Phytochemical tests revealed presence various families compounds such as alkaloids, flavonoids tannins organic extracts. Antioxidant power assessedusing 2,2-diphenyl-1-picrylhydrazyl (DPPH-) radical scavenging method, based on determination 50% inhibitory...

Maneb and propanil are two commonly used pesticides that pose many environmental problems. Their rates of photodegradation have been studied by means spectrophotometric methods using UV-Visible spectrophotometry. The kinetics showed these were sensitive to light. Second order was observed in water therefore might be very persistent water. In addition, spectrofluorometry measure their infiltration through soil. This assess the level risks posed exposure environment showing that, with...