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首页> 外文期刊>Journal of Applied Polymer Science >Urea-Formaldehyde Crosslinked Starch and Guar GumMatrices for Encapsulation of Natural Liquid Pesticide [Azadirachta Indica A.Juss. (Neem) Seed Oil]: Swelling and Release kinetics
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Urea-Formaldehyde Crosslinked Starch and Guar GumMatrices for Encapsulation of Natural Liquid Pesticide [Azadirachta Indica A.Juss. (Neem) Seed Oil]: Swelling and Release kinetics

机译：尿素-甲醛交联淀粉和瓜尔胶基质用于天然液体农药的封装[Azadirachta Indica A.Juss。 （印度em树籽油）：溶胀和释放动力学

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摘要

Polymeric granules were prepared by matrix encapsulation containing 20, 35 and 50% (w/w) of natural liquid pesticide viz., Azadirachta Indica A. Juss. (neem) seed oil (NSO) per dry weight of urea formaldehyde crosslinked starch (UF-St), guar gum (UF-GG) and UF-(St+GG) matrices. Results of swelling and cumulative release kinetics are presented at 35deg C for these matrices. The static dissolution experiments have been carried out at 35deg C for seven days. The percentage cumulative release kinetic data have beenanlyzed using an empirical equation to study the release pattern of NSO through the polymeric membranes employed. Transport follows the Super Case II mechanism as tested by an empirical equation. It is found that the release of the active ingredient depends upon the type of the matrix and its swelling ability. The percentage loading of NSO with different matrices and their density exerted an influence on the release dta. The FTIR results indicated the absence of chemical interactions between the matrices and the NSO. In the majority of cases, entrapment efficiency was generally more than 95% indicating the efficient encapsulation. Furthermore, the experimental results are discussed in terms of the nature and the combined effect of the indicidual matrices as well as teh percentage loading of NSO.
机译：通过包含20、35和50％（w / w）的天然液体农药即Azadirachta Indica A.Juss的基质包封来制备聚合物颗粒。 （neem）种子油（NSO）/尿素甲醛交联淀粉（UF-St），瓜尔豆胶（UF-GG）和UF-（St + GG）基质的干重。这些基质的溶胀和累积释放动力学结果显示在35°C下。静态溶解实验已在35°C下进行了7天。累积释放动力学数据的百分比已使用经验方程式进行了分析，以研究NSO通过所采用的聚合物膜的释放方式。传输遵循Super Case II机制，通过经验公式进行测试。发现活性成分的释放取决于基质的类型及其溶胀能力。不同基质的NSO的百分含量及其密度对释放dta产生影响。 FTIR结果表明基质与NSO之间没有化学相互作用。在大多数情况下，包封率通常超过95％，表明有效的包封。此外，从指示矩阵的性质和组合效果以及NSO的百分比加载方面讨论了实验结果。

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