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中国农业大学植物保护学院构建乙基多杀菌素—羟基肉桂酸共组装纳米体系实现农药绿色增效

  • 2026-08-06 09:04:01
中国农业大学植物保护学院构建乙基多杀菌素—羟基肉桂酸共组装纳米体系实现农药绿色增效

羟基肉桂酸衍生物是植物苯丙烷代谢的重要次生代谢物,可构筑作物抗生物胁迫的天然化学屏障,但溶解性与稳定性差限制了实际应用。乙基多杀菌素(Spin)是放线菌发酵来源的广谱生物杀虫剂,兼具触杀与胃毒活性,广泛用于蓟马、玉米螟等害虫防治,但其固有疏水性、光敏性与低界面亲和力制约了药效发挥。

近日,中国农业大学植物保护学院曹永松教授团队在材料科学1区TOP期刊《Chemical Engineering Journal》(IF:12.5)上发表了一项研究。该研究以三种天然羟基肉桂酸衍生物为功能配体,与生物杀虫剂乙基多杀菌素通过非共价作用共组装,构建了系列无载体纳米农药体系,实现了酶响应控释与多通路协同杀虫,为绿色纳米农药开发提供了全新思路。

研究采用溶剂置换法,将乙基多杀菌素分别与肉桂酸、咖啡酸、绿原酸三种羟基肉桂酸衍生物共组装,构建三类纳米颗粒Scin NPs、Scaf NPs、Schl NPs,通过调控药剂与酚酸摩尔比、溶液pH两个核心参数优化制备条件。结果显示,当Spin与酚酸摩尔比为4:2、溶液pH7.0时组装效果最优,三类纳米载药量分别达78.16%、75.59%、73.32%,是传统悬浮剂的6倍以上,也显著高于现有载体型纳米制剂。由此证实,无载体共组装策略可省去载体合成与复杂助剂,提升载药量,是绿色高效的农药制剂化路径。

研究通过动态光散射、透射电镜、Zeta电位测定结合紫外-红外光谱分析,系统表征纳米的形貌、电荷与组装驱动力。结果显示三类纳米均呈近球形,粒径随配体羟基数量增多依次减小(194 nm→165 nm→145 nm),多分散指数同步降低;表面正电荷均高于纯药,绿原酸组装体系电位最高达+ 32.3 mV。光谱特征峰出现红移与位移,证实静电作用与氢键是共组装的核心驱动力。该结果明确了配体羟基化程度的构效关系:羟基数量越多,分子间作用力越强,纳米结构越致密均一,胶体稳定性越好。

团队从光稳定性、界面活性、叶面滞留、耐冲刷能力四个维度,系统评价纳米的田间应用性能。结果表明,酚酸的共轭结构可发挥紫外屏蔽作用,Schl NPs的光解半衰期达纯药的2.8倍;纳米体系表面张力与叶面接触角显著降低,在玉米、番茄、水稻三类叶片上的最大持留量均高于纯药;模拟雨水冲刷后,Schl NPs在玉米叶片的保留率达49.6%,远高于纯药。综上,共组装可同时提升农药的耐光解能力与叶面润湿粘附性能,有效减少田间药剂流失,羟基化程度越高性能提升越显著。

针对鳞翅目害虫肠道富含漆酶的特点,研究设计了酶响应释放实验,并以西花蓟马、亚洲玉米螟为靶标测定室内毒力。结果显示,无漆酶环境下24 h药物累积释放不足18%,添加漆酶后释放量最高达76.5%,证实纳米具备害虫肠道微环境响应的控释特性;毒力测定显示,三类纳米48 h LC50较原药分别降低37.11%–67.28%(西花蓟马)与28.16%–42.04%(亚洲玉米螟),绿原酸组装体系增效最显著。说明纳米体系可实现靶标部位精准释药,酚酸可抑制害虫解毒酶活性,与乙基多杀菌素形成多通路协同杀虫效应。

研究通过蚕豆根尖微核试验评估遗传毒性,以玉米、黄瓜幼苗为对象验证作物安全性。结果显示,纳米制剂诱导的微核频率显著低于纯药,无明显染色体畸变效应;10、40 mg/L施药浓度下,玉米株高、叶绿素含量与空白对照无显著差异,对黄瓜幼苗生长也无不良影响。由此证实,共组装纳米体系无显著遗传毒性,对非靶标作物生长安全,符合绿色农药的发展要求。

本研究建立了生物农药与植物次生代谢物的无载体共组装新策略,阐明了配体羟基化程度调控纳米性能的构效关系,实现了农药理化性能提升与多通路协同杀虫,为绿色纳米农药开发、农业病虫害可持续防控提供了新思路。

原文信息

Co-assembly of bioinsecticides with natural hydroxycinnamic acid derivatives into nanosystems for synergistic activity against phytophagous pests

https://doi.org/10.1016/j.cej.2026.179016

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  1. CONNECT:[ UseTime:0.000823s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001241s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006540s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000569s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001232s ]
  6. SELECT * FROM `set` [ RunTime:0.000621s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001511s ]
  8. SELECT * FROM `article` WHERE `id` = 566858 LIMIT 1 [ RunTime:0.011478s ]
  9. UPDATE `article` SET `lasttime` = 1785989105 WHERE `id` = 566858 [ RunTime:0.041090s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000759s ]
  11. SELECT * FROM `article` WHERE `id` < 566858 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003509s ]
  12. SELECT * FROM `article` WHERE `id` > 566858 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002338s ]
  13. SELECT * FROM `article` WHERE `id` < 566858 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006372s ]
  14. SELECT * FROM `article` WHERE `id` < 566858 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001941s ]
  15. SELECT * FROM `article` WHERE `id` < 566858 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010010s ]
0.242699s