Conformational transitions of poly(β‐benzyl L‐aspartate)
Conformational transitions of poly(β‐benzyl L‐aspartate)
复制标题
聚(β-L-天冬氨酸苄酯)的构象转变
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
M. Ōya
中科院分区：
文献类型：
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作者：
Hiroko Kyotani;H. Kanetsuna;M. Ōya
研究了影响薄膜中聚（β-L-天冬氨酸苄酯）构象的条件。在某些条件下，在由氯仿溶液浇铸的半干薄膜中以及将左手β-螺旋形式的无定形薄膜暴露于氯仿蒸气后，观察到从左手到右手α-螺旋形式的缓慢转变。这种转变是由水分的吸收引起的。通过差示扫描量热法和红外光谱法检查了这些薄膜的热转变。在140°C左右，右旋α螺旋转变为左旋ω螺旋，并且在一些薄膜的该区域观察到尖锐的放热峰。
Conditions that affect the conformation of poly(β-benzyl L-aspartate) in films have been studied. A slow transition from the left-handed to the right-handed α-helical form is observed under certain conditions in half-dried film cast from chloroform solutions and after exposure of amorphous films of the left-handed β-helical form to chloroform vapor. This transition is caused by adsorption of moisture. Thermal transitions of these films were examined by differential scanning calorimetry and infrared spectroscopy. The right-handed α-helices change to left-handed ω-helices around 140°C, and sharp exothermic peak is observed in this region for some films.