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+111 adducts ions peptide LCMS (TFA?)

+111 adducts ions peptide LCMS (TFA?) - Mass Spectrometry Forum

+111 adducts ions peptide LCMS (TFA?) - Discuss and post questions about LC-MS, Q-STAR, MALDI-TOF, and other Mass Spectrometry Questions in the Mass Spec Forum.


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Old 01-04-2012, 09:56 PM
JMM JMM is offline
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Default +111 adducts ions peptide LCMS (TFA?)



Hello.
I'm working with peptides.
I've got a problem with one of them. During the analysis by LCMS, some adducts have emerged with a difference of +111 mass units with ES+.
This peptide is TFA salt and the mobile phases are 0.1%TFA/H2O and 0.1%TFA/CH3CN.
I am convinced that these adducts ions are created by the TFA but usually, TFA cause a mass difference of +96 (+TFA with -H2O) or just +114 (+TFA). Maybe i'm wrong...
Does anyone have had this type of adducts?
Does anyone know the answer?
Thanks for reply.
JMM
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111 , adducts , ions , lcms , peptide , tfa


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