The 4-pyridylmethyl ester as a protecting group for glutamic and aspartic acids: ‘flipping’ peptide charge states for characterization by positive ion mode ESI-MS
作者:Sriramya Garapati、Colin S. Burns
DOI:10.1002/psc.2598
日期:2014.3
4‐pyridylmethyl estergroup for side‐chain protection of glutamic acid residues in solid‐phase peptide synthesis enables switching of the charge state of a peptide from negative to positive, thus making detection by positive ion mode ESI‐MS possible. The pyridylmethyl ester moiety is readily removed from peptides in high yield by hydrogenation. Combining the 4‐pyridylmethyl ester protecting group with benzyl