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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (21): 215-220.

• 生物技术科学 • 上一篇    下一篇

两种制备除草剂2,4-二氯苯氧乙酸分子印迹聚合物方法的比较

李嘉元 顾旭东 蒋培华   

  • 收稿日期:2011-04-12 修回日期:2011-05-09 出版日期:2011-08-25 发布日期:2011-08-25

The Comparison of Two Methods about Preparing Molecular Imprinting Polymers of 2,4-Dichlorophenoxyacetic Acid

  • Received:2011-04-12 Revised:2011-05-09 Online:2011-08-25 Published:2011-08-25

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摘要：

制备2,4-二氯苯氧乙酸(2,4-D)分子印迹聚合物，并对两种制备方法进行比较。采用本体聚合法和悬浮聚合法分别制备出2,4-D分子印迹聚合物（2,4-DMIPs）和2,4-D分子印迹聚合物微球(2,4-DMIPMs)。通过正交试验，优化了聚合配方。正交试验结果表明，合成2,4-DMIPs的最优配方为：2,4-D 1.0 mmol、MAA 4.0 mmol、EGDMA 20.0 mmol、氯仿4.0 mL、AIBN 20.0 mmol；合成2,4-DMIPMs的最优配方为：2,4-D 1.0 mmoL、MAA 8.0 mmoL、EGDMA 20.0 mmoL、氯仿8.0 mL、AIBN 10.0 mmoL。采用紫外分光光度法(UV)对MIPs和MIPMs的选择吸附性能进行研究，并进行Scatchard分析。Scatchard分析结果表明，在研究浓度范围内，MIPs和MIPMs存在一类等同的结合位点。以2,4-二氯苯酚(2,4-DCP)和2,4-二氯苯甲醛(2,4-DCAD)为竞争底物时，MIPs的分离因子α分别为3.27、3.15，MIPMs的分离因子α分别为3.78和3.70。对于以2,4-D为模板分子的印迹聚合物，悬浮聚合法制备的微球比本体聚合法制备的颗粒在一定的浓度范围内，有更好的吸附性能和选择性能。该聚合物可用于环境和农作物中2,4-D的富集和检测，具有较好的应用前景。

关键词: 百合, 百合, 矿质营养, 施肥技术, 栽培基质

Abstract:

Molecular imprinted polymers of 2,4-dichlorophenoxyacetic acid (2,4-D) were prepared in two methods which were compared in this thesis. 2,4-DMIPs and 2,4-DMIPMs were prepared by noumenon polymeric and suspension polymerization method respectively. The polymerization formula was optimized via orthogonal experiment. The orthogonal experiment results showed that the optimal preparation formula for DMIPs was as follows: 2,4-D 1.0 mmoL, MAA 4.0 mmoL, chloroform 4.0 mL, AIBN 20.0 mmoL, and that for DMIPS was as following conditions: 2,4-D 1.0 mmoL, MAA 8.0 mmoL, chloroform 8.0 mL, AIBN 10.0 mmoL. The absorption selectivty of the MIPs and MIPMs was studied by UV, and Scatchard analysis was performed. Scatchard analysis showed that the binding sites of equal class were formed in the MIPs and MIPMs under the concentration range studied. When 2,4-Dichlorophenol (2,4-DCP) and 2, 4-Dichlorobenzaldehyde (2,4-DCAD) were chosen as the competitive molecules, the separation factors for MIPs and MIPMs were 3.27, 3.15 and 3.78, 3.70 respectively. The rusults showed that: 2,4-DMIPMs had better adsorption and selective properties than 2,4-DMIPs in certain range. The MIPMs were expected to enrich and test 2,4-D in the environment and crops, and had a good application prospect.