Phosphoserine/threonine MS/MS

Kenneth Williams (Kenneth.Williams@yale.edu)
Tue, 20 Oct 1998 14:08:19 -0400

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We have noticed that since installing delayed extraction on our MALDI-Tof
instrument, reflectron analyses of phosphoserine and phosphothreonine
containing synthetic peptides give a low amount of the characteristic -97
dalton ion, with a more predominant peak at -88.3 to -88.9 daltons. Have
others seen this latter ion as well and does anyone have an explanation for
its origin?

Thanks,

Kathy Stone/Ken Williams

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