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Alkali metal-mediated proline aggregation in solution observed by coldspray ionization mass spectrometry
Miki Kunimura1, Shigeru Sakamoto, Kentaro Yamaguchi
1Chemical Analysis Center, Chiba University Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Organic Letters
|February 1, 2002
Abstract:
L-Proline aggregates to form cyclic clusters in the presence of alkali metal ions in solution, whereas a large-scale-aggregated chain structure was observed for several other amino acids. The major cyclic clusters are suggested to be constructed from trimeric and tetrameric subunits on the basis of direct solution analysis by coldspray ionization mass spectrometry.