Patent 7951602 was granted and assigned to UNIVERSITY OF GEORGIA RESEARCH FOUNDATION, INC. on May, 2011 by the United States Patent and Trademark Office.
Mass defect labeled peptides and methods of identifying peptides are provided. In particular, embodiments of the present disclosure include mass defect labels for polypeptides that include at least one cysteine and/or at least one tryptophan and methods of using the mass defect labels to identify polypeptides. One embodiment, among others, includes a mass defect labeled peptide including at least one cysteine residue labeled with 2,4-dibromo-acetanilide. Another embodiment, among others, includes a mass defect labeled peptide including at least one tryptophan residue labeled with 4,6-dibromo-2-trifluoromethylphenylsulfenyl chloride.