Department of Biotechnology, CT Group of Institutions, Jalandhar, Punjab, India.
Department of Chemistry, CT Group of Institutions, Jalandhar, Punjab, India.
Int J Biol Macromol. 2019 Jul 1;132:1252-1261. doi: 10.1016/j.ijbiomac.2019.04.023. Epub 2019 Apr 4.
This work reports the synthesis of lipase enzyme catalyzed biodegradable hydrogel interpenetrating polymer network (hydrogel-IPN) of natural gum polysaccharide i.e. gum tragacanth (GT) with acrylamide (AAm) and methacrylic acid (MAA) and their potential application in the delivery of agrochemicals. Biodegradation experiments were performed using composting and soil burial methods of biodegradation. Complete degradation of synthesized hydrogel-IPN occurred within 77 days using composting method, while using soil burial method 81.26% degradation occurred after 77 days. Furthermore, effect hydrogel-IPN degradation on the fertility of soil was also studied through macro-analysis of soil. Water retention capacity of clay soil and sandy loam soil was improved after mixing swelled sample of hydrogel-IPN with these soil samples. The potential of hydrogel-IPN was also tested for sustained and slow release of two agrochemicals i.e. urea and calcium nitrate. Kinetics of agrochemicals release revealed that the release rate of both the fertilizers was initially higher which kept on decreasing with time. Diffusion mechanism of agrochemicals followed Case-II diffusion type behavior. Therefore, synthesized hydrogel-IPN is important from agriculture view point and can be used for sustained and controlled release of agrochemicals.
这项工作报道了脂酶酶催化的天然胶多糖，即黄蓍胶（GT）与丙烯酰胺（AAm）和甲基丙烯酸（MAA）的可生物降解水凝胶互穿聚合物网络（水凝胶-IPN）的合成及其在农用化学品输送中的潜在应用。使用堆肥和土壤掩埋的生物降解方法进行了降解实验。使用堆肥法，合成的水凝胶-IPN 在 77 天内完全降解，而使用土壤掩埋法，在 77 天后降解了 81.26%。此外，还通过土壤的宏观分析研究了水凝胶-IPN 降解对土壤肥力的影响。将水凝胶-IPN 的溶胀样品与这些土壤样品混合后，粘土和砂壤土的保水能力得到了提高。水凝胶-IPN 的潜力也通过两种农用化学品，即尿素和硝酸钙的持续和缓慢释放来测试。农用化学品释放的动力学表明，两种肥料的释放率最初较高，随着时间的推移不断降低。农用化学品的扩散机制遵循第二案例扩散类型行为。因此，从农业角度来看，合成的水凝胶-IPN 很重要，可用于农用化学品的持续和控制释放。
