2017-03-15
Reduced Acid Dissociation of Amino-Acids at the Surface of Water
Publication
Publication
J. Am. Chem. Soc. , Volume 139 - Issue 10 p. 3716- 3720
We use surface-specific intensity vibrational sum-frequency generation (VSFG) and attenuated total reflection spectroscopy (ATR) 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 non-dissociated 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.
| Additional Metadata | |
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| European Research Council (ERC) , NWO | |
| ACS | |
| doi.org/10.1021/jacs.6b12079 | |
| J. Am. Chem. Soc. | |
| Organisation | Ultrafast Spectroscopy |
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Strazdaite, S., Meister, K., & Bakker, H. (2017). Reduced Acid Dissociation of Amino-Acids at the Surface of Water. J. Am. Chem. Soc., 139(10), 3716–3720. doi:10.1021/jacs.6b12079 |
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