Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Basic Amino Acid-Modified Lignin-Based Biomass Adjuvants: Synthesis, Emulsifying Activity, Ultraviolet Protection, and Controlled Release of Avermectin
Langmuir ( IF 3.7 ) Pub Date : 2021-10-10 , DOI: 10.1021/acs.langmuir.1c02113
Kai Chen 1 , Shengrong Yuan 2 , Dan Wang 1 , Yinli Liu 1 , Fengfeng Chen 2 , Dongming Qi 1
Langmuir ( IF 3.7 ) Pub Date : 2021-10-10 , DOI: 10.1021/acs.langmuir.1c02113
Kai Chen 1 , Shengrong Yuan 2 , Dan Wang 1 , Yinli Liu 1 , Fengfeng Chen 2 , Dongming Qi 1
Affiliation
|
Avermectin (AVM) is a highly effective and safe biopesticide but is very sensitive to ultraviolet (UV) light and exhibits poor water solubility. Developing green and multifunctional adjuvants is important for the protection and controlled release of AVM. In this work, a number of water-soluble enzymatic hydrolysis lignins (W-EHLs) were prepared via grafting basic amino acids and used as emulsifiers with co-surfactants to prepare high-internal phase emulsions (HIPEs). The results showed that W-EHLs with co-surfactants could be prepared with HIPEs that contained 90 vol % green oil phases such as turpentine, and the stability of the HIPEs first increased and then decreased when the rate of grafting of basic amino acids on lignin increased from 0.26 to 1.46 mmol/g. The more polar oil droplets were less deformable due to their higher viscosity, thereby affording a stability advantage to HIPEs. Subsequently, the relations between the stability and interfacial viscoelasticity of the emulsion were effectively correlated by interfacial rheology, droplet size, and physical stability tests. The results showed that HIPEs with smaller droplets had poor fluidity and strong interfacial viscoelasticity due to their higher droplet packing density, which resulted in good macroscopic stability. Like the AVM carrier, the retention rate of AVM in HIPEs was 80.1% after UV radiation for 72 h, which represented the highest UV protection efficiency in AVM delivery systems. The release curves showed that the rate of release of AVM from HIPEs was adjusted by controlling the pH value of the medium. In addition, the release of HIPEs is completely in accord with both diffusion and the matrix erosion mechanism. The strategy could be extended to other sensitive pesticides and used to promote the development of sustainable agriculture.
中文翻译：
碱性氨基酸改性木质素基生物质助剂：阿维菌素的合成、乳化活性、紫外线防护和控释
阿维菌素 (AVM) 是一种高效且安全的生物农药，但对紫外线 (UV) 非常敏感且水溶性较差。开发绿色多功能佐剂对于AVM的保护和控释具有重要意义。在这项工作中，通过接枝碱性氨基酸制备了许多水溶性酶水解木质素（W-EHLs），并作为乳化剂与辅助表面活性剂一起制备高内相乳液（HIPEs）。结果表明，含有90vol%绿色油相如松节油的HIPEs可以制备含助表面活性剂的W-EHLs，且随着碱性氨基酸接枝率在木质素上的增加，HIPEs的稳定性先增加后降低。从 0.26 增加到 1.46 mmol/g。极性越大的油滴由于其较高的粘度而不易变形，从而为 HIPE 提供稳定性优势。随后，乳液的稳定性和界面粘弹性之间的关系通过界面流变学、液滴尺寸和物理稳定性测试有效地关联起来。结果表明，液滴较小的HIPEs由于液滴堆积密度较高，流动性差，界面粘弹性强，宏观稳定性好。与 AVM 载体一样，在紫外线照射 72 小时后，HIPE 中 AVM 的保留率为 80.1%，这代表了 AVM 递送系统中最高的紫外线防护效率。释放曲线表明通过控制介质的pH值来调节AVM从HIPEs中的释放速率。此外，HIPEs 的释放完全符合扩散和基质侵蚀机制。
更新日期：2021-10-19
中文翻译：
碱性氨基酸改性木质素基生物质助剂：阿维菌素的合成、乳化活性、紫外线防护和控释
阿维菌素 (AVM) 是一种高效且安全的生物农药，但对紫外线 (UV) 非常敏感且水溶性较差。开发绿色多功能佐剂对于AVM的保护和控释具有重要意义。在这项工作中，通过接枝碱性氨基酸制备了许多水溶性酶水解木质素（W-EHLs），并作为乳化剂与辅助表面活性剂一起制备高内相乳液（HIPEs）。结果表明，含有90vol%绿色油相如松节油的HIPEs可以制备含助表面活性剂的W-EHLs，且随着碱性氨基酸接枝率在木质素上的增加，HIPEs的稳定性先增加后降低。从 0.26 增加到 1.46 mmol/g。极性越大的油滴由于其较高的粘度而不易变形，从而为 HIPE 提供稳定性优势。随后，乳液的稳定性和界面粘弹性之间的关系通过界面流变学、液滴尺寸和物理稳定性测试有效地关联起来。结果表明，液滴较小的HIPEs由于液滴堆积密度较高，流动性差，界面粘弹性强，宏观稳定性好。与 AVM 载体一样，在紫外线照射 72 小时后，HIPE 中 AVM 的保留率为 80.1%，这代表了 AVM 递送系统中最高的紫外线防护效率。释放曲线表明通过控制介质的pH值来调节AVM从HIPEs中的释放速率。此外，HIPEs 的释放完全符合扩散和基质侵蚀机制。
京公网安备 11010802027423号