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Inclusion complex of butachlor with beta-cyclodextrin: characterization, solubility, and speciation-dependent
Haitao Bian1, Jingwen Chen, Xiyun Cai
1Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), Department of Environmental Science and Technology, Dalian University of Technology, Dalian, People's Republic of China.
Journal of Agricultural and Food Chemistry
|July 24, 2009
Summary
Beta-cyclodextrin (beta-CD) enhances butachlor solubility and reduces its soil adsorption by forming an inclusion complex. This improves herbicide availability for weeds while mitigating environmental risks associated with high butachlor application rates.
Area of Science:
- Environmental Chemistry
- Agricultural Science
- Supramolecular Chemistry
Background:
- Soil adsorption of herbicides like butachlor necessitates higher application rates, increasing environmental risks.
- Understanding the interaction between herbicides and soil components is crucial for developing sustainable agricultural practices.
Purpose of the Study:
- To investigate the effects of beta-cyclodextrin (beta-CD) on the solubility and soil adsorption of the herbicide butachlor.
- To characterize the inclusion complex formed between butachlor and beta-CD.
Main Methods:
- Formation and characterization of the butachlor-beta-CD inclusion complex using spectroscopic techniques (FTIR).
- Quantification of butachlor solubility and soil adsorption in the presence of varying beta-CD concentrations.
- Determination of the stability constant and stoichiometry of the inclusion complex.
Main Results:
- A 1:1 stoichiometric inclusion complex of butachlor and beta-CD was formed with a stability constant of 443 L mol(-1).
- Beta-CD significantly enhanced butachlor solubility and reduced its adsorption on soil, with the complex exhibiting lower sorption (K(d,c) = 6.14) compared to free butachlor (K(d,f) = 44.54).
- Despite reduced adsorption of the complex, its proportion in total adsorbed amounts increased with beta-CD concentration, indicating its adsorption cannot be neglected.
Conclusions:
- Beta-cyclodextrin can be utilized as a formulation additive to improve butachlor's solubility and reduce its soil adsorption.
- The formation of butachlor-beta-CD inclusion complexes increases herbicide availability for weed control.
- These findings offer a strategy to optimize herbicide efficacy and minimize environmental impact.
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