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Novel Humo-Pectic Hydrogels for Controlled Release of Agroproducts

机译：农业擅的控制释放新型水果胶水凝胶

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摘要

Sustainable and precision agriculture requires that agroproducts be employed for plants' benefits with maximum efficiency and reduced environmental hazard. Since hydrogels may become efficient vehicles for agroproduct spreading, we prepared novel humo-pectic hydrogels by first blending low methyl-esterified pectin with either humic substances (HS) extracted from different composted biomasses or humic-like substances (HULIS) from depolymerized lignocellulose waste derived by biorefinery activities and, then, by cross-linking with calcium chloride through ionotropic gelation. Hydrogels were characterized by solid-state C-13 NMR spectroscopy, scanning electron microscopy (SEM), magnetic resonance imaging (MRI) and rheological analyses. Their ability to work as controlled-release systems was tested by kinetically monitoring the release of a previously incorporated phloroglucinol. Our results indicated that the hydrogels made with HULIS (HP-HULIS) showed a better controlled-release property than those containing HS (HP-HS). This highly depended on the larger content of oligosaccharides, lesser porosity, and greater cross-linking density of HP-HULIS as compared to HP-HS. Our study suggests that the development of a technology based on such novel humo-pectic hydrogels as carriers of bioactive compounds may represent a promising strategy for the controlled and environmentally safe delivery of agroproducts to crops.
机译：可持续和精密农业要求农业擅在植物的益处，最大效率和降低环境危害。由于水凝胶可以成为农业擅的展开的有效车辆，因此通过首先将低甲基酯化的果胶与从解聚的木质纤维素废物中萃取的腐殖质物质（HS）与腐殖质（HULIS）提取的腐殖质物质（HS）制备新的疏水性水凝胶。通过生物料理活动，然后通过通过离子凝胶化与氯化钙交联。通过固态C-13 NMR光谱，扫描电子显微镜（SEM），磁共振成像（MRI）和流变分析来表征水凝胶。通过动力学监测先前掺入的甘油蛋白醇的释放来测试其作为控释系统的工作能力。我们的结果表明，用Hulis（HP-Hulis）制备的水凝胶显示比含HS（HP-HS）的水凝块更好的控释性。与HP-HS相比，这高度依赖于寡糖的少糖，较小孔隙率和更大的交联密度的HP-Hulis。我们的研究表明，基于这种新的Humo-Pectic水凝胶的技术的发展作为生物活性化合物的载体可以代表对农作物的受控和环境安全递送的有希望的策略。

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