Application of modified magnetic nanoparticles with amine groups as an efficient solid sorbent for simultaneous removal of 2,4-Dichlorophenoxyacetic acid and 2-methyl-4-chlorophenoxyacetic acid from aqueous solution: optimization and modeling

2017 ◽  
Vol 15 (2) ◽  
pp. 421-429 ◽  
Author(s):  
Farzad Mohammadi ◽  
Ali Esrafili ◽  
Majid Kermani ◽  
Mohammad Behbahani
Keyword(s):  
Aqueous Solution ◽  
Magnetic Nanoparticles ◽  
Dichlorophenoxyacetic Acid ◽  
Simultaneous Removal ◽  
Solid Sorbent ◽  
Amine Groups ◽  
Chlorophenoxyacetic Acid ◽  
Modified Magnetic Nanoparticles ◽  
2,4 Dichlorophenoxyacetic Acid

Two Enzyme Immunoassays to Screen for 2,4-Dichlorophenoxyacetic Acid in Water

1987 ◽  
Vol 70 (5) ◽  
pp. 874-878 ◽  
Author(s):  
James Fleeker
Keyword(s):  
Limit Of Detection ◽  
Solid Phase ◽  
Dichlorophenoxyacetic Acid ◽  
Carrier Protein ◽  
Similar Response ◽  
Enzyme Immunoassays ◽  
Concentration Step ◽  
Chlorophenoxyacetic Acid ◽  
Phenoxy Herbicides ◽  
2,4 Dichlorophenoxyacetic Acid

Abstract Two solid-phase enzyme immunoassays were developed to measure 2,4-dichlorophenoxyacetic acid (2,4-D), using 2 sets of structurally distinct immunogens and enzyme ligands. The 2,4-D analog, 2-methyl- 4-chlorophenoxyacetic acid (MCPA), gave a similar response with both methods, whereas other phenoxy herbicides cross-reacted differently. In method A, the aromatic moiety of 2,4-D was distal from the carrier protein and labeled enzyme, whereas in method B, the acetic acid portion of the herbicide was distal. The use of both methods to screen for this herbicide in ground water and municipal and river water reduced the number of false-positive responses. Water sources having a low background response could be monitored with either method alone. When a concentration step, with disposable C18 extraction columns, was used, the limit of sensitivity was 5 ng/L,. Method A was the more sensitive of the 2 methods with a limit of detection of 10 j*g/L without the concentration step

EXPERIMENTS ON THE RELATIVE SUSCEPTIBILITY OF WEEDS TO AUXIN HERBICIDES

1962 ◽  
Vol 40 (11) ◽  
pp. 1401-1409 ◽  
Author(s):  
J. R. Hay
Keyword(s):  
Phaseolus Vulgaris ◽  
Root Formation ◽  
Effective Control ◽  
Inorganic Salts ◽  
Dichlorophenoxyacetic Acid ◽  
Functional Importance ◽  
Molecular Configuration ◽  
Auxin Herbicides ◽  
Chlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

Sections of stems of Silene cucubalus, Galeopsis tetrahit, and Phaseolus vulgaris were cultured under sterile conditions in media containing inorganic salts, sucrose, agar, and the herbicides 2-methyl, 4-chlorophenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, or 2-(2,4,5-trichlorophenoxy)propionic acid. The herbicide which gave the most effective control of a species under field conditions was also the most active in inducing root formation and proliferation on stem sections of that species. The response of the sections to these auxin herbicides diminished as the plants from which the sections were taken became more mature. The amount of herbicide recovered from treated shoots of these species was not correlated with susceptibility. It is postulated that susceptibility to these materials depends upon (i) the affinity of the species for the molecular configuration of the herbicide and (ii) the relative amount and functional importance of the susceptible tissues at the time of treatment.

scholarly journals Polyaniline modified magnetic nanoparticles coated with dicationic ionic liquid for effective removal of rhodamine B (RB) from aqueous solution

RSC Advances ◽  
2018 ◽  
Vol 8 (58) ◽  
pp. 33180-33192 ◽  
Author(s):  
Mohamad Shariff Shahriman ◽  
Nur Nadhirah Mohamad Zain ◽  
Sharifah Mohamad ◽  
Ninie Suhana Abdul Manan ◽  
Suhaila Mohd Yaman ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquid ◽  
Magnetic Nanoparticles ◽  
Rhodamine B ◽  
Schematic Diagram ◽  
Effective Removal ◽  
Dicationic Ionic Liquid ◽  
Modified Magnetic Nanoparticles

Schematic diagram of the removal procedure of RB on MNP-PANI-DICAT.

scholarly journals Characterization of Hapten-Protein Conjugates: Antibody Generation and Immunoassay Development for Chlorophenoxyacetic Acid Pesticides

2009 ◽  
Vol 92 (6) ◽  
pp. 1773-1779 ◽  
Author(s):  
Robin C Boro ◽  
K Vikas Singh ◽  
C Raman Suri
Keyword(s):  
Inhibitory Concentration ◽  
Dichlorophenoxyacetic Acid ◽  
Protein Conjugation ◽  
Protein Conjugates ◽  
Highly Sensitive ◽  
Ic50 Values ◽  
Chlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

Abstract The generation of specific and sensitive antibodies against small molecules is greatly dependent upon the characteristics of the hapten-protein conjugates. In this study, we report a new fluorescence-based method for the characterization of hapten-protein conjugates. The method is based on an effect promoted by hapten-protein conjugation density upon the fluorescence intensity of the intrinsic tryptophan chromophore molecules of the protein. The proposed methodology is applied to quantify the hapten-protein conjugation density for two different chlorophenoxyacetic acid pesticides, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4-dichlorophenoxybutyric acid (2,4-DB), coupled to carrier protein. Highly sensitive anti-2,4-D and anti-2,4-DB antibodies were obtained using these well-characterized hapten-protein conjugates. The generated antibodies were used in an immunoassay format demonstrating inhibitory concentration (IC50) values equal to 30 and 7 ng/mL for 2,4-D and 2,4-DB, respectively. Linearity was observed in the concentration range between 0.1500 ng/mL with LODs around 4 and 3 ng/mL for 2,4-D and 2,4-DB, respectively, in standard water samples. The proposed method was successfully applied for the determination of the extent of hapten-protein conjugation to produce specific antibodies for immunoassay development against pesticides.

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