An 18O-labeling assisted LC/MS method for assignment of aspartyl/isoaspartyl products from Asn deamidation and Asp isomerization in proteins.
Wang S, Kaltashov IA. An 18O-labeling assisted LC/MS method for assignment of aspartyl/isoaspartyl products from Asn deamidation and Asp isomerization in proteins. Anal Chem. 2013 Jul 02; 85(13):6446-52.