scholarly journals A Synergistic Sensitized Fluorescent Determination of 2,4-Dichlorophenoxyacetic Acid in Vegetable Samples Based on the Derivatives of Calix[4]arene

2019 ◽  
Vol 3 (4) ◽  
pp. p142
Author(s):  
Xiashi Zhu ◽  
Qiuyi Ren
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Dichlorophenoxyacetic Acid ◽  
Type Analysis ◽  
Vegetable Samples ◽  
Inclusion Interaction ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Sensitizing Effect ◽  
Derivatives Of

A novel fluorescent determination of 2,4-dichlorophenoxyacetic acid (2,4-D) based on the derivatives of calix[4]arene (SAX) in ?-cyclodextrin(?-CD)/ sodium dodecyl sulfate (SDS) synergistic sensitized system was developed. The results were shown that the fluorescence intensity of SAX could be quenched by 2,4-D, and the fluorescence quenching (?F=FSAX-F2,4-D -SAX) was synergistic sensitized in ?-CD/ SDS medium. Under the conditions of ?ex/em=332/468 nm and pH 7.0, the linear range for 2,4-D were found to be 0.020-4.00 ?g/mL. The mechanism of determination was discussed with quenching type analysis, inclusion interaction and sensitizing effect. This method has been applied for the determination of 2,4-D in vegetable samples with satisfactory results.

scholarly journals Electroanalytical Methodology for the Direct Determination of 2,4-Dichlorophenoxyacetic Acid in Soil Samples Using a Graphite-Polyurethane Electrode

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Fernanda Ramos de Andrade ◽  
Renata Alves de Toledo ◽  
Carlos Manoel Pedro Vaz
Keyword(s):  
Irreversible Process ◽  
Direct Determination ◽  
Parameters Optimization ◽  
Dichlorophenoxyacetic Acid ◽  
Reduction Peak ◽  
Undisturbed Soil ◽  
Polyurethane Composite ◽  
Experimental Parameters ◽  
2,4 Dichlorophenoxyacetic Acid

An electroanalytical methodology was developed for the direct determination of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) using a graphite-polyurethane composite electrode and square wave voltammetry (SWV). 2,4-D exhibited one reduction peak with characteristics of an irreversible process at −0.54 V (versus Ag/AgCl), which is controlled by the diffusion of the reagent on the electrode surface. After the experimental parameters optimization (pH 2.0,f=50 s−1,a=0.50 V, andΔEi=0.03 V), analytical curves were constructed in the range of 0.66 mg L−1to 2.62  mg L−1. Detection (LD) and quantification (LQ) limits were 17.6 μg L−1and 58.6 μg L−1, respectively. The methodology was successfully applied to measure the percolation of the herbicide 2,4-D in undisturbed soil columns of different granulometric compositions.

Amplifying Bienzyme Cycle-linked Immunoassays for Determination of 2,4-Dichlorophenoxyacetic Acid

1996 ◽  
Vol 799 (1 Enzyme Engine) ◽  
pp. 519-524 ◽  
Author(s):  
FRANK F. BIER ◽  
EVA EHRENTREICH-FÕRSTER ◽  
FRIEDER W. SCHELLER
Keyword(s):  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

scholarly journals Protein of insect sperm mitochondrial crystals. Crystallomitin.

1977 ◽  
Vol 73 (3) ◽  
pp. 594-600 ◽  
Author(s):  
B Baccetti ◽  
R Dallai ◽  
V Pallini ◽  
F Rosati ◽  
B A Afzelius
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Sodium Dodecyl ◽  
Dodecyl Sulfate ◽  
Filament Bundles ◽  
Cross Links ◽  
Insect Sperm ◽  
Main Period ◽  
20 Nm ◽  
Derivatives Of

Mitochondrial derivatives of insect sperm usually contain a crystalline protein that shows a 45-nm main period, made up of 20-nm subperiods, determined by the coiling of filament bundles. Filaments are 2 nm thick and have a globular appearance. The crystals contain two main polypeptides, 52,000 and 55,000 daltons. These polypeptides are closely related, contain a high percentage of proline, and are insoluble in sodium dodecyl sulfate due to disulfide cross links. We suggest for this class of protein the name crystallomitin.

scholarly journals Determination of Simvastatin by Voltammetry Method at Screen-Printed Electrode Modified by Graphene Oxide Nanosheets and Sodium Dodecyl Sulfate

2022 ◽  
Author(s):  
Abolfazl Darroudi ◽  
Saeid Nazari ◽  
Seyed Ali Marashi ◽  
Mahdi Karimi-Nazarabad
Keyword(s):  
Graphene Oxide ◽  
Sodium Dodecyl Sulfate ◽  
Limit Of Detection ◽  
Sodium Dodecyl ◽  
Screen Printed Electrode ◽  
Support Electrolyte ◽  
Limit Of Quantitation ◽  
Dodecyl Sulfate ◽  
Screen Printed

Abstract An accurate, rapid, simple, and novel technique was developed to determine simvastatin (SMV). In this research, a screen-printed electrode (SPE) was deposited with graphene oxide (GO) and sodium dodecyl sulfate (SDS), respectively. For the first time, the handmade modified SPE measured the SMV by differential pulse voltammetry (DPV) with high sensitivity and selectivity. The results of cyclic voltammetry indicated the oxidation irreversible process of SMV. Various parameters (pH, concentration, scan rate, support electrolyte) were performed to optimize the conditions for the determination of SMV. Under the optimum experiment condition of 0.1 M KNO3 as support electrolyte and pH 7.0, the linear range was achieved for SMV concentration from 1.8 to 36.6 µM with a limit of detection (LOD), and a limit of quantitation (LOQ) of 0.06 and 1.8 µM, respectively. The proposed method was successfully utilized to determine SMV in tablets and urine samples with a satisfactory recovery in the range of 96.2 to 103.3%.

scholarly journals Optimization of the Conditions for Determining 2,4-D and Deltamethrin by HPLC

2020 ◽  
Vol 20 (4) ◽  
pp. 372-377
Author(s):  
Elena V. Melikhova ◽  
◽  
Olga V. Farafonova ◽  
Keyword(s):  
River Water ◽  
Chromatographic Determination ◽  
Capillary Columns ◽  
Dichlorophenoxyacetic Acid ◽  
Separate Determination ◽  
Isocratic Elution ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Gradient Mode

The paper presents the results of optimizing the conditions for the chromatographic determination of 2,4-dichlorophenoxyacetic acid and deltamethrin for two capillary columns (Supelcosil LC-18, Kromasil C-18). The modes of individual chromatography of pesticides were selected. The use of the isocratic elution mode in the joint presence of 2,4-dichlorophenoxyacetic acid and deltamethrin was shown and experimentally proved to be invalid. Three options were proposed for the conditions of the gradient mode of the separate detection of analytes in a mixture. The developed technique for the chromatographic separate determination of 2,4-D and deltamethrin with their joint presence was tested via analysis of river water and potato samples.

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