4.8 Article

Ultraviolet spectroscopy of peptide and protein polyanions in vacuo: Signature of the ionization state of tyrosine

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 129, Issue 27, Pages 8428-+

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ja072818r

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UV spectroscopy of trapped polyanions of different variants of angiotensin peptides and of different charge states of insulin are presented. The spectra show bathochromic shifts and provide a direct determination of the ionization state of the tyrosine chromophores in gas-phase peptides or proteins.

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