Supramolecular Peptoid Structure Strengthens Complexation with Polyacrylic Acid Microgels.

Supramolecular Peptoid Structure Strengthens Complexation with Polyacrylic Acid Microgels.
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超分子肽结构增强与聚丙烯酸微凝胶的络合。

DOI:
10.1021/acs.biomac.3c01242
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发表时间:
2024
期刊:
影响因子:
6.2
通讯作者:
Libera,MatthewR
Libera,MatthewR
中科院分区:
化学2区
文献类型:
--
作者:
Zhao,Wenhan;Lin,JenniferS;Nielsen,JosefineEilsø;Sørensen,Kristian;Wadurkar,AnandSunil;Ji,Jingjing;Barron,AnneliseE;Nangia,Shikha;Libera,MatthewR

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我们已经研究了阳离子抗菌剂和聚阴离子微凝胶之间的络合作用,以产生响应性地抵抗细菌定植的自我防御表面。基本性质是在生理离子强度下在微凝胶内稳定螯合负载的(复合的)抗菌剂。在这里,我们评估聚(丙烯酸)[PAA]微凝胶和一系列的阳离子类肽,显示从低聚单体的四聚体的超分子结构之间的络合强度。我们遵循负载微凝胶直径的变化与增加[Na+]作为衡量counter-doping水平。与先前关于粘菌素/PAA络合的发现一致,我们发现单体类肽在远低于生理条件的离子强度下完全释放,尽管其具有+5电荷。相比之下,逐渐更高程度的类肽超分子结构显示出逐渐更大的耐盐析性,我们归因于与多聚体类肽束络合相关的更大的熵稳定性。
We have studied the complexation between cationic antimicrobials and polyanionic microgels to create self-defensive surfaces that responsively resist bacterial colonization. An essential property is the stable sequestration of the loaded (complexed) antimicrobial within the microgel under a physiological ionic strength. Here, we assess the complexation strength between poly(acrylic acid) [PAA] microgels and a series of cationic peptoids that display supramolecular structures ranging from an oligomeric monomer to a tetramer. We follow changes in loaded microgel diameter with increasing [Na+] as a measure of the counterion doping level. Consistent with prior findings on colistin/PAA complexation, we find that a monomeric peptoid is fully released at ionic strengths well below physiological conditions, despite its +5 charge. In contrast, progressively higher degrees of peptoid supramolecular structure display progressively greater resistance to salting out, which we attribute to the greater entropic stability associated with the complexation of multimeric peptoid bundles.
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