Dual pH responsive azoxystrobin controlled release microspheres constructed from porous calcium carbonate and its biosecurity
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摘要: 刺激响应性农药控释系统为提高农药利用效率和减少环境污染提供了强有力的策略。本研究中，在采用共沉淀法制备多孔碳酸钙微球(CaCO3)的基础上，通过浸渍吸附法获得负载嘧菌酯(Az)的多孔碳酸钙微球(Az/CaCO3)，并在复合微球表面进一步包覆单宁酸-Cu2+络合物，构建了一个具有双pH响应性的嘧菌酯控释系统(Az/CaCO3@TA-Cu)。理化性能研究表明成功制备了Az/CaCO3@TA-Cu微球，其载药量为16.42%。模拟释放研究结果表明Az/CaCO3@TA-Cu具有良好的pH控释性能，在pH=7的磷酸缓冲溶液中96 h累积释放率为36.99%，而在pH＝5和pH＝9条件下的累积释放率分别为74.32%和58.79%。菌丝体生长速率实验表明Az/CaCO3@TA-Cu对禾谷镰刀菌生长具有较好的抑制作用，中值抑制浓度为纯Az和Az/CaCO3的6.58倍和3.28倍。此外，小麦发芽率和斑马鱼存活率统计结果显示，Az/CaCO3@TA-Cu相对于Az/CaCO3和纯Az表现出更优的生物安全性。Abstract: Stimuli-responsive pesticide controlled release systems provide a powerful strategy for improving pesticide utilization efficiency and reducing environmental pollution. In this study, based on the preparation of porous calcium carbonate microspheres (CaCO3) by co-precipitation method, porous calcium carbonate microspheres loaded with pyrimethanil (Az) were obtained by impregnation and adsorption method (Az/CaCO3), and the surface of the composite microspheres was further encapsulated with a tannic acid-Cu2+ complex, which constructed a pyrimethanil controlled-release system with dual pH-responsiveness (Az/CaCO3@TA-Cu). Physicochemical performance studies showed successful preparation of Az/CaCO3@TA-Cu microspheres with 16.42% drug loading. The results of simulated release studies showed that Az/CaCO3@TA-Cu had good pH-controlled release properties, with a cumulative release rate of 36.99% in phosphate buffer solution at pH = 7 for 96 h, whereas the cumulative release rates at pH = 5 and pH = 9 were 74.32% and 58.79%, respectively. Mycelial growth rate experiments showed that Az/CaCO3@TA-Cu had a better inhibitory effect on the growth of Fusarium graminearum, with median inhibitory concentrations of 6.58 and 3.28 times that of pure Az and Az/CaCO3. In addition, wheat germination and zebrafish survival statistics showed that Az/CaCO3@TA-Cu exhibited superior biosafety relative to Az/CaCO3 and pure Az.
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Key words:
- azoxystrobin /
- calcium carbonate /
- tannic acid /
- drug delivery system /
- controlled release
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图 1 CaCO3(a)和单宁酸包覆的嘧菌酯/多孔CaCO3载药系统(Az/CaCO3@TA-Cu)(b)的SEM图，及Az/CaCO3@TA-Cu中的O、Ca、Cl和Cu元素映射图(c)
Figure 1. SEM images of CaCO3 (a) and tannic acid-coated pyrimethanil/porous CaCO3 carrier system (Az/CaCO3@TA-Cu) (b), elemental mapping of O, Ca, Cl and Cu in Az/CaCO3@TA-Cu (c)
图 2 Az、CaCO3、Az/CaCO3、Az/CaCO3@TA-Cu的电位图(a)和红外吸收光谱图(b)
Figure 2. Potentials (a) and FT-IR (b) of Az、CaCO3、Az/CaCO3、Az/CaCO3@TA-Cu
图 3 Az、Az/CaCO3、Az/CaCO3@TA-Cu的TG曲线(a)和在土壤中的释放曲线(b)
Figure 3. TG curves of Az、Az/CaCO3、Az/CaCO3@TA-Cu (a) and release curves in soil (b)
图 4 Az/CaCO3和Az/CaCO3@TA-Cu中Az的释放曲线(a); 不同pH条件下 Az/CaCO3@TA-Cu的释放曲线(b)
Figure 4. Release curves of Az in Az/CaCO3 and Az/CaCO3@TA-Cu (a); Release curves Az/CaCO3@TA-Cu under different pH conditions (b)
图 5 使用零级方程(a); 一级方程(b); Higuchi方程(c); Ritger-Peppas方程(d)拟合Az/CaCO3@TA-Cu在不同pH条件下的曲线
Figure 5. Fitting of Az/CaCO3@TA-Cu curves at different pH conditions using zero-order equations (a); first-order equations (b); Higuchi's equation (c); Ritger-Peppas' equation (d)
图 6 Az、Az/CaCO3和Az/CaCO3@TA-Cu在不同浓度下，对禾谷镰刀菌病在第 3-5 天的抑菌情况
Figure 6. Inhibition of Fusarium graminearum disease by Az、Az/CaCO3 and Az/CaCO3@TA-Cu at different concentrations at day 3-5
图 7 Az、Az/CaCO3和Az/CaCO3@TA-Cu在不同浓度下，对小麦发芽的影响
Figure 7. Effect of Az, Az/CaCO3 and Az/CaCO3@TA-Cu at different concentrations on germination of wheat
图 8 Az、Az/CaCO3和Az/CaCO3@TA-Cu在不同浓度下，对斑马鱼的影响
Figure 8. Effects of Az, Az/CaCO3 and Az/CaCO3@TA-Cu at different concentrations on zebrafish
表 1 通过拟合几个动力学方程计算Az/CaCO3@TA-Cu释放Az的参数
Table 1. Parameters for Az/CaCO3@TA-Cu release of Az by fitting several kinetic equations
Model pH values k n r2 Zero-order 5 0.555 — 0.618 7 0.448 — 0.572 9 0.294 — 0.740 First-order 5 0.159 — 0.895 7 0.130 — 0.813 9 0.155 — 0.963 Higuchi 5 6.570 — 0.851 7 3.237 — 0.921 9 5.397 — 0.820 Ritger-Peppas 5 28.416 0.226 0.978 7 11.815 0.259 0.991 9 21.980 0.235 0.951 Notes: k is the release rate constant; n is the release characteristic index; r 2 is the regression coefficient. 
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表 2 禾谷镰刀菌病原菌抗真菌活性测试结果
Table 2. Results of antifungal activity test of Fusarium graminearum pathogens
Day 3 Sample Toxicity regression equation EC50 /
(mg·L−1)Standard error R2 Pure Az y=0.339x-0.4266 18.19 0.140 0.9696 Az/CaCO3 y=0.394x-0.3035 5.77 0.138 0.9592 Az/CaCO3@TA-Cu y=0.475x-0.1310 1.88 0.136 0.9776 Day 4 Sample Toxicity regression equation EC50/
(mg·L−1)Standard error R2 Pure Az y=0.468x-0.4708 11.41 0.145 0.9040 Az/CaCO3 y=0.439x-0.3869 7.87 0.141 0.9608 Az/CaCO3@TA-Cu y=0.526x-0.2334 2.79 0.140 0.9042 Day 5 Sample Toxicity regression equation EC50/
(mg·L−1)Standard error R2 Pure Az y=0.447x-0.6147 18.40 0.150 0.9648 Az/CaCO3 y=0.556x-0.4176 5.61 0.145 0.9977 Az/CaCO3@TA-Cu y=0.558x-0.245 2.80 0.140 0.9361 Notes: EC50 is median effect concentration; R2 is the regression coefficient.
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