The essential oil of basil (Ocimum basilicum) has significant biological activity against insect pests and can be extracted through various techniques. This work aimed to optimize validate the extraction process O. basilicum submitted different drying temperatures leaves by combination a Clevenger method ultrasound. under conditions was evaluated for potential control Sitophilus zeamais. optimized according sonication time ultrasound (0, 8, 19, 31 38 min) hydrodistillation (20, 30, 45, 60 70...

The sugarcane industry has huge potential for biorefinery concept application, given its development in recent years.In this context, cane sugar straw become an attractive raw material biofuel production.This study aims to investigate the chemical composition of from different regions Brazil, and optimize a hydrothermal pretreatment stage cellulosic ethanol production.Results characterization assessed indicated little influence place on composition.Hydrothermal showed high efficiency...

Soxhlet extraction is a method recommended by the Association of Official Analytical Chemists (AOAC) to determine lipid content in plant samples. Generally, n-hexane (toxicity grade 5) used as solvent (≈300 mL; ≈30 g sample) at boiling temperatures (69 °C) for long times (≤16 h) under chilled water reflux (≈90 L/h), proportionally aggravated number repetitions and samples determined. In this sense, technique neither safe nor sustainable analyst or environment. This article presents...

The impairment of productivity and harvest coffee beans by weeds is more accentuated when the infestation occurs between flowering fruiting periods plant. However, controlling these plants with herbicides, such as glyphosate, can result in crop contamination accumulation herbicide through drift during application. In this sense, work sought to determine stage development at which application glyphosate does not beans. Glyphosate was applied lower doses 5 different stages plant, from bean...

Este trabalho teve o objetivo de avaliar comportamento da mistura comercial ametryn + trifloxysulfuron-sodium em área cultivada com cana-de-açúcar, relação ao seu potencial lixiviação e persistência no ambiente. A sobre Argissolo Vermelho-Amarelo eutrófico foi dividida duas subáreas, nas quais foram cultivadas as variedades cana SP 791011 801816. Os tratamentos compostos pelas aplicações pré pós-emergência dos herbicidas nos anos 2003 2003/2004, sendo realizadas quatro amostragens solo...

Abstract Given the insecticidal potential of eugenol as a fumigant, this work aimed to determine diffusion coefficient emanating from pure standard solution (99%), well clove essential oil ( Eugenia caryophillata Thunb. (Myrtaceae)) through rice grain; chemically analyse volatile composition commercially available and oil; evaluate mortality Sitophilus zeamais Motschulsky (Coleoptera: curculionidae) after exposure inside test chamber filled with rice. The solid phase microextraction method...

Objetivou-se com este trabalho determinar a meia-vida (t½) do herbicida ametryn em Argissolo Vermelho-Amarelo e Latossolo Vermelho-Amarelo, diferentes valores de pH. Foram utilizados vasos revestidos internamente filme plástico preenchidos 330,0 g amostras dos solos estudo (Latossolo - LVA pH corrigidos para 4,4, 4,9 5,8, PVA 5,9). As desses foram coletadas pastagens degradadas isentas da aplicação herbicidas. A essas foi aplicado o na dose 2,5 L ha-1. Doze horas após essa aplicação,...

This article proposes an alternative method, using cloud-point extraction and gas chromatography, for determination of disulfoton in water samples. For extraction, the nonionic surfactant Triton X-114 was used. Before a cleanup stage removal from extracts optimized. Cleanup used two columns, series, containing silica gel Florisil, with methanol:hexane (1 : 1) as eluent, resulting more than 95% X-114. Factors such ionic strength (>0.5 mol L−1) concentration (1.0% w/v) increased efficiency...

This study evaluated the mobility and persistence of atrazine ametryn in red–yellow latosols using polyvinyl chloride columns with a diameter 100 mm height 15 cm. The assays simulated 60-mm rainfall events at 10-day intervals for 70 days. leaching were these two herbicides. analytes obtained from samples quantified by gas chromatography flame ionization detection. Compared ametryn, showed greater potential to reach depths below cm over 30 days rain. Ametryn, however, soil after application....

This research proposes an alternative method to detect and quantify glyphosate residues in unroasted green coffee beans by LC-MS/MS. The sample preparation was conducted without derivatization steps, with integrated cleanup, which improves the analytical method's frequency. Validation results were consistent requirements of regulatory guidelines employed. Specificity, linearity (

Este trabalho teve como objetivo selecionar espécies tolerantes ao tebuthiuron, visando utilizá-las em programas de fitorremediação solos contaminados com esse herbicida. Foram avaliadas: Amaranthus hybridus, Crotalaria juncea, Chamaesyce hyssopifolia, C. hirta, Canavalia ensiformes, Helianthus annus, Pennisetum typhoides, Estizolobium aterrimum, Raphanus raphanistrum e incana. O experimento foi conduzido casa vegetação, vasos contendo 3 dm³ solo textura argilo-arenosa 2,18 dag kg¹ matéria...

Methods used to determine pesticide residues in teas typically require several laborious steps for sample preparation before analysis. In this study, a simple method based on solid-liquid extraction with low-temperature partitioning (SLE/LTP) and analysis by gas chromatography coupled mass spectrometry (GC-MS) was optimized validated the determination of (pirimiphos-methyl, flutriafol, cyproconazole, bifenthrin) dehydrated green tea leaves. After (LTP), extract acetonitrile subjected...