Preparation and Characterization of Imidacloprid Lignin鈥揚olyethylene Glycol Matrices Coated with Ethylcellulose

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• 作者：Francisco Flores-C茅spedes ; Cristina Isabel Figueredo-Flores ; Isabel Daza-Fern谩ndez ; Fernando Vidal-Pe帽a ; Matilde Villafranca-S谩nchez ; Manuel Fern谩ndez-P茅rez
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：February 1, 2012
• 年：2012
• 卷：60
• 期：4
• 页码：1042-1051
• 全文大小：459K
• 年卷期：v.60,no.4(February 1, 2012)
• ISSN：1520-5118

文摘

Imidacloprid, a systemic insecticide that has a water solubility of 610 mg L^鈥?, has been formulated in lignin鈥損olyethylene glycol matrices by a melting process. This formulation was coated in a Wurster type fluidized-bed equipment using ethylcellulose and dibutyl sebacate. Imidacloprid has been entrapped, with an entrapment efficiency higher than 87% in all cases. Thermogravimetric analysis, differential scanning calorimetry, and Fourier transformed infrared spectroscopy studies indicate the stability and compatibility of polymers and imidacloprid. Scanning electron microscopy images show a homogeneous film of ethylcellulose in coated formulations. From T₅₀ values (the time taken for 50% of the active ingredient to be released into water), the release rate of imidacloprid is controlled by changing the thickness of the coating film and modifying its surface properties by adding a plasticizer. T₅₀ values, ranging from 3.02 to 168.6 h, allow supplying the appropriate amount of imidacloprid in each specific agronomic practice to increase the efficiency of this bioactive material and minimize the risk of environmental pollution.

Keywords:

imidacloprid; controlled release; lignin; polyethylene glycol; ethylcellulose