Structural Diversity of α-Amino Acid Based Layer-Block Dendrons and Their Layer-Block Sequence-Dependent Gelation Properties
作者:Hak-Fun Chow、Jie Zhang
DOI:10.1002/chem.200500174
日期:2005.10.7
A library of G1-G3 alpha-amino acid based layer-block dendrons 1-6 containing different amino acid residues in the different concentric layers was prepared by solution-phase peptide synthesis. The structures of these dendrons were characterized by 1H and 13C NMR spectroscopy and, except for the G3 series of compounds, by mass spectrometry. The purities of these compounds were also determined by size-exclusion
通过溶液相肽合成,制备了在不同同心层中包含不同氨基酸残基的基于G1-G3α-氨基酸的层嵌段树突1-6的文库。这些树枝状分子的结构通过1H和13C NMR光谱进行表征,除G3系列化合物外,通过质谱进行表征。这些化合物的纯度也通过尺寸排阻色谱法确定。由于存在大量酰胺基,这些树枝状分子在极性和非极性溶剂中均显示出异常强的自聚集性质。这些树突中的一些被发现是芳香族溶剂的极好的有机胶凝剂,其最低凝胶浓度接近4 mg mL(-1)。发现它们的胶凝能力高度依赖于氨基酸组合物的性质,树突状结构内的氨基酸层阻断序列以及焦点功能的性质。红外光谱分析表明胶凝作用是由分子间的氢键引起的。圆二色性研究表明,在凝胶状态下会形成分层的手性结构,尽管通过扫描电子显微镜无法观察到手性形态的存在。