Improvement of the desorption of the pesticide 2,4-D via complexation with HP-β-cyclodextrin

Inclusion complex formation of 2,4‐dichlorophenoxyacetic acid (2,4‐D) with hydroxypropyl‐β‐cyclodextrin (HP‐β‐CD) has been proposed as a way of modifying the behaviour of the pesticide in the soil environment. The present study assesses the effect of complex formation on 2,4‐D physicochemical proper...

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Published in:Pest management science 2000-05, Vol.56 (5), p.425-430
Main Authors: Pérez-Martínez, José I, Ginés, Juan M, Morillo, Esmeralda, González-Rodríguez, María L, Moyano Méndez, José R
Format: Article
Language:English
Subjects:
2,4‐D
4-D
Agronomy. Soil science and plant productions
Biological and medical sciences
Chemical control
complex formation
cyclodextrins
desorption
Fundamental and applied biological sciences. Psychology
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
Soil and water pollution
Soil science
Weeds
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container_start_page 425
container_title Pest management science
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creator Pérez-Martínez, José I
Ginés, Juan M
Morillo, Esmeralda
González-Rodríguez, María L
Moyano Méndez, José R
description Inclusion complex formation of 2,4‐dichlorophenoxyacetic acid (2,4‐D) with hydroxypropyl‐β‐cyclodextrin (HP‐β‐CD) has been proposed as a way of modifying the behaviour of the pesticide in the soil environment. The present study assesses the effect of complex formation on 2,4‐D physicochemical properties (aqueous solubility, crystallinity and dissolution rate) and its behaviour on soils. The solid complexes were prepared using different methods (spray drying, kneading and heating in a sealed container). To confirm the complex formation in the solid state differential scanning calorimetry, hot stage microscopy and x‐ray diffraction techniques were employed. Complex formation in solution was studied by phase solubility. The presence of HP‐β‐CD increased the 2,4‐D solubility nine times approximately. The apparent stability constant was determined as 98.6 M −1. The dissolution rates of the 2,4‐D/HP‐β‐CD complexes were examined and compared with that of the pure pesticide. The results indicated that the complex may have great utility as a rapid way of dissolving the pesticide. Batch experiments were performed to study the adsorption–desorption of 2,4‐D on soils and the influence of the HP‐β‐CD over these processes. The results showed that HP‐β‐CD could increase the desorption of 2,4‐D previously adsorbed on soils. © 2000 Society of Chemical Industry
doi_str_mv 10.1002/(SICI)1526-4998(200005)56:5<425::AID-PS156>3.0.CO;2-W
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Manag. Sci</addtitle><date>2000-05</date><risdate>2000</risdate><volume>56</volume><issue>5</issue><spage>425</spage><epage>430</epage><pages>425-430</pages><issn>1526-498X</issn><eissn>1526-4998</eissn><coden>PMSCFC</coden><abstract>Inclusion complex formation of 2,4‐dichlorophenoxyacetic acid (2,4‐D) with hydroxypropyl‐β‐cyclodextrin (HP‐β‐CD) has been proposed as a way of modifying the behaviour of the pesticide in the soil environment. The present study assesses the effect of complex formation on 2,4‐D physicochemical properties (aqueous solubility, crystallinity and dissolution rate) and its behaviour on soils. The solid complexes were prepared using different methods (spray drying, kneading and heating in a sealed container). To confirm the complex formation in the solid state differential scanning calorimetry, hot stage microscopy and x‐ray diffraction techniques were employed. Complex formation in solution was studied by phase solubility. The presence of HP‐β‐CD increased the 2,4‐D solubility nine times approximately. The apparent stability constant was determined as 98.6 M −1. The dissolution rates of the 2,4‐D/HP‐β‐CD complexes were examined and compared with that of the pure pesticide. The results indicated that the complex may have great utility as a rapid way of dissolving the pesticide. Batch experiments were performed to study the adsorption–desorption of 2,4‐D on soils and the influence of the HP‐β‐CD over these processes. The results showed that HP‐β‐CD could increase the desorption of 2,4‐D previously adsorbed on soils. © 2000 Society of Chemical Industry</abstract><cop>Chichester, UK</cop><pub>John Wiley &amp; Sons, Ltd</pub><doi>10.1002/(SICI)1526-4998(200005)56:5&lt;425::AID-PS156&gt;3.0.CO;2-W</doi><tpages>6</tpages></addata></record>
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1526-4998
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subjects 2,4‐D
4-D
Agronomy. Soil science and plant productions
Biological and medical sciences
Chemical control
complex formation
cyclodextrins
desorption
Fundamental and applied biological sciences. Psychology
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
Soil and water pollution
Soil science
Weeds
title Improvement of the desorption of the pesticide 2,4-D via complexation with HP-β-cyclodextrin
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