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首页> 外文期刊>Journal of Polymer Science, Part A. Polymer Chemistry >Design and synthesis of a fluorescently end-labeled poly(β-amino ester): Application to the characterization of degradable polyelectrolyte multilayers
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Design and synthesis of a fluorescently end-labeled poly(β-amino ester): Application to the characterization of degradable polyelectrolyte multilayers

机译:荧光末端标记聚(β-氨基酯)的设计与合成:在可降解聚电解质多层膜表征中的应用

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摘要

We report the synthesis of a fluorescently end-labeled analog of a synthetic and degradable cationic poly(β-amino ester) (PBAE; polymer 1) used in past studies for the delivery of DNA and the layer-by-layer assembly of erodible polyelectrolyte multilayers (PEMs). The synthesis of an analog of polymer 1 having acrylate-functionalized end groups provided a platform for the introduction of fluorescent labels by postpolymerization conjugate addition of amine-functionalized fluorophores. This approach enabled the synthesis of fluorescently end-labeled polymer (polymer 1_(FL)) with molecular weights and polydispersities (M_n = 18,000; PDI ~ 1.8) similar to those used in past studies for the fabrication of PEMs using polymer 1. Layer-by-layer assembly of PEMs using polymer 1_(FL) and poly(styrene sulfonate) enabled characterization of film erosion and, for the first time, direct observation of the release of cationic polymer from these assemblies using fluorescence microscopy and fluorometry. Our results shed new light on the behaviors of the cationic components of these PEMs and could prove useful for the design of thin films for a range of different controlled release applications. Our results also provide new fluorescent cationic polymer probes that could be useful for characterization of the behaviors of PBAEs in other fundamental or applied biotechnological contexts.
机译:我们报告了合成和可降解的阳离子聚(β-氨基酯)(PBAE;聚合物1)的荧光末端标记类似物的合成,该类似物在过去的研究中用于传递DNA和易蚀性聚电解质的逐层组装多层(PEM)。具有丙烯酸酯官能化的端基的聚合物1的类似物的合成提供了通过胺官能化的荧光团的后聚合共轭加成引入荧光标记的平台。这种方法可以合成具有分子量和多分散性(M_n = 18,000; PDI〜1.8)的荧光末端标记的聚合物(聚合物1_(FL)),类似于过去使用聚合物1制备PEM的研究。使用聚合物1_(FL)和聚(苯乙烯磺酸盐)对PEM进行逐层组装能够表征膜侵蚀,并且首次使用荧光显微镜和荧光分析法直接观察了阳离子聚合物从这些组装中的释放。我们的结果为这些PEM的阳离子成分的行为提供了新的线索,并可能证明对设计用于一系列不同控释应用的薄膜很有用。我们的结果还提供了新型的荧光阳离子聚合物探针,可用于表征PBAE在其他基本或应用生物技术环境下的行为。

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