scholarly journals DISSIPAÇÃO DO HERBICIDA (R,S) HALOXIFOPE EM LATOSSOLO TROPICAL

2004 ◽  
Vol 14 ◽  
Author(s):  
MARCUS BARIFOUSE MATALLO ◽  
LUIZ CARLOS LUCHINI ◽  
FLAVIO MARTINS GARCIA BLANCO ◽  
TEREZINHA BONANHO PERES ◽  
DANIEL GUSTAVO RICHENA
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Half Life ◽  
High Performance ◽  
Methanolic Extract ◽  
Tropical Soil ◽  
Soil Samples ◽  
Ultra Sound ◽  
Previously Treated ◽  
Para Determinar

Com o objetivo de estudar o comportamento do herbicida (R,S)-haloxifope em solo tropical realizouse este trabalho para determinar sua dissipação num latossolo roxo eutrófico. Para isso, amostras de solo (em triplicata) foram previamente tratadas com haloxifope metil racêmico e incubadas a 25oC por 0, 6, 10 15, 30 e 60 dias. Após cada período de incubação as amostras foram submetidas a extração em ultra-som, purificadas com diclorometano, evaporadas em rotavapor e ressuspendidas em metanol. O extrato metanólico foi analisado por Cromatografia a Líquido de Alta Eficiência (CLAE). Os dados cinéticos mostraram meia-vida inicial (t0½) de 7,38 dias, o que pode estar relacionado com a atividade microbiana de caráter enantiosseletivo no solo. (R,S)-HALOXYFOP DISSIPATION IN A TROPICAL LATOSOIL Abstract The aim of the work was to study the behavior of the herbicide (R,S)-haloxyfop in a tropical soil. This work was realized to determine its dissipitaion in an eutrophic purple latosoil. Three replicates of soil samples were previously treated with methyl racemic haloxyfop and incubated at 25ºC for 0, 6, 10, 15, 30 and 60 days. After each incubation period the samples were submited to ultra sound extraction, purified with dichoromethane, evaporated and ressuspended in methanol. The methanolic extract was analysed by High Performance Liquid Chromatography (HPLC). The kinetics data revealed initial half life (t01/2) of 7.38 days, which can probably be related to the microbial activity with enantioselective character in soil.

Mesoporous carbon reinforced hollow fiber liquid-phase microextraction for the enrichment of phenylurea herbicides followed by their determination with high performance liquid chromatography

2015 ◽  
Vol 7 (3) ◽  
pp. 901-908 ◽  
Author(s):  
Qiuhua Wu ◽  
Ying Zhao ◽  
Chun Wang ◽  
Meng Sun ◽  
Xiaoxing Ma ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Liquid Phase ◽  
Hollow Fiber ◽  
Mesoporous Carbon ◽  
High Performance ◽  
Soil Samples ◽  
Phenylurea Herbicides ◽  
Liquid Phase Microextraction ◽  
Water And Soil Samples

A mesoporous carbon reinforced hollow fiber liquid phase microextraction method was developed for the enrichment of phenylurea herbicides from water and soil samples.

Purification of a 166mHo solution by successive high-performance liquid chromatography and gravitational chromatography for half-life determination

2014 ◽  
Vol 302 (1) ◽  
pp. 289-295 ◽  
Author(s):  
Florence Guéguen ◽  
Hélène Isnard ◽  
Karsten Kossert ◽  
Carole Bresson ◽  
Céline Caussignac ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Half Life ◽  
High Performance

scholarly journals Identification and Quantification of Soil Pesticides in Coastal Lakshmipur District of Bangladesh

2021 ◽  
Vol 46 (2) ◽  
pp. 191-200
Author(s):  
M Amin Uddin ◽  
Nasidulabedin Chowdhury ◽  
Md Abdur Rahman ◽  
Md Harunur Rashid ◽  
M Alamgir Zaman Chowdhury ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Pesticide Residues ◽  
High Performance ◽  
Soil Samples ◽  
Hplc Technique ◽  
Soil Sediments ◽  
Identification And Quantification

This study was carried out to determine the presence and quantity of some selected pesticides from soil sediments collected from some ponds and canals located in the Lakshmipur district of Bangladesh. The high performance liquid chromatography (HPLC) technique was used to determine the concentration of pesticide residues. Some soil samples were found to be contaminated with carbamate (carbofuran and carbaryl) and organophosphorus (diazinon) pesticides. The concentration of carbofuran pesticide ranged from 0.303 μg/kg to 1.851 μg/kg. The highest concentration of carbofuran pesticide was found in SSP6 (1.851 μg/kg) and the lowest concentration was found in SSP9 (0.303 μg/kg). Carbaryl pesticide was found to be present in the sediment of only one pond, the concentration being 1.047 μg/kg. Organophosphorus (diazinon) pesticide was found in soil samples and the concentrations ranged from 0.147 μg/kg to 0.759 μg/kg, which were higher than the EEC-recommended limit of 0.1 μg/kg. Asiat. Soc. Bangladesh, Sci. 46(2): 191-200, December 2020

scholarly journals Portrayal of Punica granatum L. peel extract through High Performance Liquid Chromatography and antimicrobial activity evaluation

2023 ◽  
Vol 83 ◽  
Author(s):  
M.S. Mahmood ◽  
A. Ashraf ◽  
S. Ali ◽  
A.B. Siddique ◽  
F. Asad ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Methanolic Extract ◽  
Punica Granatum ◽  
Diffusion Method ◽  
Staph Aureus ◽  
E Coli ◽  
Peel Extract

Abstract Increasing trend in antimicrobial resistance and failure of chemically synthesized antibiotics lead to discover alternative methods for the treatment of bacterial infections. Various medicinal plants are in use traditionally and their active compounds can be further applied for treatment of bacterial diseases. This study was designed to determine the antibacterial activity of Punica granatum (P. granatum L.) (pomegranate) peel extract against Enterobacteriaceae [Escherichia coli (E. coli), Salmonella Typhimurium (S. Typhimurium) and Shigella Dysenteriae (S. Dysenteriae)] and gram-positive bacterium [Staphylococcus aureus (Staph aureus)]. Methanolic extract of P. granatum L. peel was prepared by Soxhlet apparatus method. Total flavonoid and phenolic contents from the extract were determined by High Performance Liquid Chromatography (HPLC). The antibacterial activity of P. granatum L. peel extract was evaluated through agar well diffusion method. HPLC showed the range of phenolics (gallic acid, caffeic acid, benzoic acid, cinnamic acid) and flavonoid compounds. The chemical structures of flavonoid and phenolics found in the methanolic extract of P. granatum L. peel have been reported for the first time. The methanolic peel extract (50 ul) of yellow P. granatum L. showed 26, 10, 10 and 9mm zones of inhibition (ZOI) against S. aureus, S. Typhimurium, S. Dysenteriae and E. coli, respectively. The methanolic extract of red P. granatum L. (100 ul) showed 27, 8, 12 and 15 mm ZOI against Staph. aureus, S. Typhimurium, S. Dysenteriae and E. coli, respectively. Highest ZOI was observed against Staph. aureus. Many of the bacteria studied in the present work may cause serious gastrointestinal infections, which can lead to hemorrhagic diarrhea in children. These infections can be life-threatening to young children and the elderly. There is an incentive to find alternative control measures, such as plant and herbal extracts, especially in lesser-developed countries where traditional antibiotics may not be readily available.

scholarly journals Decreasing half-life of dieldrin in egg yolk following a single oral administration of aldrin to laying hens

2001 ◽  
Vol 49 (4) ◽  
pp. 465-472
Author(s):  
N. Furusawa
Keyword(s):  
Body Weight ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Single Dose ◽  
Half Life ◽  
High Performance ◽  
Laying Hens ◽  
Egg Yolk ◽  
Single Oral Administration ◽  
Low Levels

Laying hens were treated orally with a single dose of aldrin (AD) 1 mg/kg body weight. Concentrations (μg/g) of AD or its epoxide (= dieldrin, DD) in the yolk of eggs laid for 21 days after AD treatment were determined by normalphase high-performance liquid chromatography. The limits of determination were 0.02 μg/g for AD and 0.03 μg/g for DD, respectively. After AD treatment, although the low levels of AD (mean 0.02–0.03 μg/g) were observed only during a three-day period (from 4th to 6th days), DD (mean 0.15 μg/g) was found already on the 2nd day, indicating that the epoxidation of AD to DD in the hen’s body is rapid. The highest level of DD (mean 0.40 μg/g) was detected on the 6th day, and then DD levels decreased slowly and were detected up to the 21st day. In this decreasing phase, the half-life of DD in the yolk was estimated to be 25.6 days with a 95% confidence interval from 22.7 to 29.4 days.

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