Journal
ANALYTICAL CHEMISTRY
Volume 79, Issue 20, Pages 7910-7915Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac071294a
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We developed a method for selective isolation of N-blocked peptides from a complex mixture such as an enzymatic digest of a protein. The approach is based on a newly designed isocyanate-resin (resin-NCO), which specifically reacts with a-amino or imino groups. This method, then, permits the isolation of N-blocked peptides, even those containing Lys, from a peptide mixture as intact forms by trapping N-free peptides via covalent bonding to the resin-NCO. The present study demonstrates the performance of this method for the selective isolation of N-blocked peptides by applying it to several peptide mixtures, including proteolytic digests.
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