化学
羧酸盐
羧酸
电离
离解(化学)
丙氨酸
离子
红外光谱学
脯氨酸
氨基酸
无机化学
光化学
立体化学
分析化学(期刊)
物理化学
有机化学
生物化学
作者
Simona Strazdaitė,Konrad Meister,Huib J. Bakker
摘要
We use surface-specific intensity vibrational sum-frequency generation and attenuated total reflection spectroscopy to probe the ionization state of the amino-acids l-alanine and l-proline at the air/water surface and in the bulk. The ionization state is determined by probing the vibrational signatures of the carboxylic acid group, representing the nondissociated acid form, and the carboxylate anion group, representing the dissociated form, over a wide range of pH values. We find that the carboxylic acid group deprotonates at a significantly higher pH at the surface than in the bulk.
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