Aggregation behaviour of peptide–polymer conjugates containing linear peptide backbones and multiple polymer side chains prepared by nitroxide-mediated radical polymerization
作者:Michael Möller、Carsten Hentschel、Lifeng Chi、Armido Studer
DOI:10.1039/c0ob01047b
日期:——
A series of peptides with an alternating sequence of alkoxyamine conjugated lysine and glycine residues were synthesized by classical solution phase peptide coupling. The resulting peptides containing up to eight alkoxyamine moieties were used as initiators in nitroxide-mediated polymerization (NMP) to obtain peptideâpolymer conjugates with well defined linear peptide backbones and a defined number of polymeric side chains. Polymerization of styrene and N-isopropylacrylamide (NIPAM) occurred in a highly controlled fashion. Molecular weight and polydispersity index (PDI) were determined by gel permeation chromatography (GPC). Aggregation behaviour of these hybrid materials was investigated by dynamic light scattering (DLS) and atomic force microscopy (AFM). Depending on composition, number and length of the polymer side chains, the conjugates aggregate to different topologies. Whereas peptideâpolystyrene conjugates may aggregate to so called honeycomb structures, peptideâpoly-N-isopropylacrylamide conjugates show differentiated aggregation behaviour.
一系列交替排列的醇胺共轭赖氨酸和甘氨酸残基的肽通过经典溶液相肽耦合法合成。合成的肽含有多达八个醇胺基团,作为自发启动剂用于氮氧化物介导的聚合(NMP),以获得具有明确线性肽主链和一定数量聚合物侧链的肽-聚合物共轭物。苯乙烯和N-异丙基丙烯酰胺(NIPAM)的聚合以高度受控的方式进行。通过凝胶渗透色谱(GPC)测定分子量和聚分散指数(PDI)。这些杂化材料的聚集行为通过动态光散射(DLS)和原子力显微镜(AFM)进行了研究。根据组成、聚合物侧链的数量和长度,共轭物以不同的拓扑结构聚集。肽-聚苯乙烯共轭物可能聚集成所谓的蜂窝结构,而肽-聚N-异丙基丙烯酰胺共轭物则显示出区别聚集行为。