宋玉莹, 朱峰, 曹冲, 曹立冬, 李凤敏, 赵鹏跃, 黄啟良. 负载噻呋酰胺的超分子水凝胶在水稻叶面的动态沉积行为[J]. 农药学学报, 2021, 23(5): 1004-1011. DOI: 10.16801/j.issn.1008-7303.2021.0099
    引用本文: 宋玉莹, 朱峰, 曹冲, 曹立冬, 李凤敏, 赵鹏跃, 黄啟良. 负载噻呋酰胺的超分子水凝胶在水稻叶面的动态沉积行为[J]. 农药学学报, 2021, 23(5): 1004-1011. DOI: 10.16801/j.issn.1008-7303.2021.0099
    SONG Yuying, ZHU Feng, CAO Chong, CAO Lidong, Li Fengmin, ZHAO Pengyue, HUANG Qiliang. Dynamic deposition behavior of supramolecular hydrogels loaded with thifluzamide on rice leaves[J]. Chinese Journal of Pesticide Science, 2021, 23(5): 1004-1011. DOI: 10.16801/j.issn.1008-7303.2021.0099
    Citation: SONG Yuying, ZHU Feng, CAO Chong, CAO Lidong, Li Fengmin, ZHAO Pengyue, HUANG Qiliang. Dynamic deposition behavior of supramolecular hydrogels loaded with thifluzamide on rice leaves[J]. Chinese Journal of Pesticide Science, 2021, 23(5): 1004-1011. DOI: 10.16801/j.issn.1008-7303.2021.0099

    负载噻呋酰胺的超分子水凝胶在水稻叶面的动态沉积行为

    Dynamic deposition behavior of supramolecular hydrogels loaded with thifluzamide on rice leaves

    • 摘要: 水稻叶片表面布满了绒毛、乳头状突起、蜡质等特殊结构,以及水稻叶片存在一定倾角,农药喷雾雾滴极易从叶面弹跳滚落,造成药剂浪费的同时污染土壤和地下水,并可能对非靶标生物造成严重危害。因此,有效提高农药喷雾雾滴在水稻叶片上的滞留和沉积对于提高农药有效利用率至关重要。本研究以叶酸和硝酸锌为原料,设计了一种负载噻呋酰胺的叶酸/Zn2+超分子水凝胶,具有生物相容性和可生物降解的优势,而且原材料来源丰富,制备过程简便易操作。叶酸是一种水溶性B族维生素,分子中含有喋呤啶、对氨基苯甲酸和谷氨酸结构,叶酸分子通过喋呤啶部分形成四聚体,四聚体通过π−π堆积形成纳米纤维,Zn2+交联纳米纤维形成水凝胶纤维网状结构。使用流变仪测定负载噻呋酰胺的叶酸/Zn2+超分子水凝胶的流变性能,发现叶酸和硝酸锌的比例会影响制备的凝胶的机械强度,且Zn2+的比例越高,形成的凝胶机械强度越强,其中在n(叶酸)/n(Zn2+) = 1/1.8~1/2.0比例范围内制备的凝胶适合于农药喷雾,凝胶具有剪切变稀和自修复的特性。通过超高速摄影技术对负载噻呋酰胺的叶酸/Zn2+超分子水凝胶调控液滴在水稻叶片上的沉积行为进行了研究,结果表明,凝胶液滴可在超疏水水稻叶片表面稳定沉积,不发生弹跳、碎裂和飞溅的现象。

       

      Abstract: The surface of rice leaves is covered with villi, papillae, wax and other special structures, and there is a certain dip angle of rice leaves. Pesticide spray droplets can easily bounce off the leaf surface, pollute soil and groundwater, and futher cause serious harm to non-target organisms. Therefore, improving the retention and deposition of pesticide spray droplets on rice leaves is essential for improving the effective utilization of pesticides. In this work, folic acid and zinc nitrate were used as raw materials to design a folate/Zn2+ supramolecular hydrogel loaded with thifluzamide, which had the advantages of biocompatibility and biodegradability. And the raw materials was rich in source, and the preparation process of the hydrogel was simple and easy to operate. Folic acid is a water-soluble vitamin-B whose parent compound consists of a combination of teropterin, p-aminobenzoic acid and glutamate. The folic acid molecule formed a tetramer through the pteridine part, and then combined with Zn2+. The gel was cross-linked to form a nanofiber network structure. The rheological properties of the folate/Zn2+ supramolecular hydrogel loaded with thifluzamide was measured by a rheometer, which suggested that the ratio of folic acid and zinc nitrate could affect the mechanical strength of the prepared gel and higher ratio of zinc ions was associated with stronger mechanical strength of the formed gel. In addition, the gel prepared with the ratio of folic acid and Zn2+ in the range of 1/1.8-1/2.0 was suitable for pesticide spraying, which had the characteristics of shear-thinning and self-healing. And the folate/Zn2+ supramolecular hydrogel loaded with thifluzamide was used to study the deposition behavior of droplets on rice leaves by ultra-high-speed photography. The results showed the gel droplets can stably deposit on the surface of superhydrophobic rice leaves without bouncing, fragmentation and splashing phenomena.

       

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