(DPA) luminophore on the main backbone. The secondary structures of these pyrene-DPA-PBLG polypeptides were investigated using Fourier transform infrared spectroscopy and wide-angle X-ray diffraction, revealing that the polypeptides with DPs of less than 19 were mixtures of α-helical and β-sheet conformations, whereas the α-helical structures were preferred for longer chains. Interestingly, pyrene-DPA-2NH2
在本研究中,我们通过N , N-二(4-
氨基苯基)-
1-氨基芘(
芘-DPA - 2NH 2 )—聚(γ-苄基-L-glutamate) (PBLG) 聚合物,具有不同的聚合度 (DP),每个聚合物的主骨架上都有一个二(4-
氨基苯基)
芘胺 (DPA) 发光体。使用傅里叶变换红外光谱和广角X射线衍射研究了这些
芘-DPA-PBLG
多肽的二级结构,揭示了DP小于19的
多肽是α-螺旋和β-折叠构象的混合物,而对于较长的链,优选α-螺旋结构。有趣的是,
芘-DPA-2NH 2表现出微弱的光致发光 (PL),而
芘-DPA-PBLG
多肽的发射强度是其 16 倍,这表明将 PBLG 链连接到
芘-DPA-2NH 2上开启了辐射途径非荧光分子。此外,
芘-DPA-2NH2表现出聚集引起的猝灭;相反,在掺入具有刚性杆构象的 PBLG 片段后,所得的
芘-DPA-PBLG
多肽显示出聚集诱导的发射。透射电子显微镜显示,将这些
多肽与