Abstract:
:Unit-resolution mass spectra have been obtained for peptides as large as 17 kDa, providing information on impurities and adduct ions, as well as accurate molecular weight values. Electrospray ionization produces many multiply-charged species of the same mass; isotopic peak resolution provides direct charge state assignment from the unit mass spacing of the isotopes. This is of special value when the spectrum also has many masses, such as from precursor ion dissociation or impurities. Mass measuring errors not only are concomitantly lower (less than 0.1 Da) than when the isotopic peaks are unresolved but also are independent of variations in 13C/12C natural isotopic abundances. Also, larger errors are avoided that occur when the measured peak envelope includes impurity or adduct ions. This also benefits tandem mass spectrometry; dissociation of peptide ions as large as 8.5 kDa yields fragment masses consistent (less than 0.1 Da) with their amino acid sequences.
journal_name
Proc Natl Acad Sci U S Aauthors
Loo JA,Quinn JP,Ryu SI,Henry KD,Senko MW,McLafferty FWdoi
10.1073/pnas.89.1.286keywords:
subject
Has Abstractpub_date
1992-01-01 00:00:00pages
286-9issue
1eissn
0027-8424issn
1091-6490journal_volume
89pub_type
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