title: Ionization energies of multiply protonated polypeptides obtained by tandem ionization in Fourier transform mass spectrometers.
abstract: Ionization energies (IE) of [M + zH](z+) (z+) electrospray-produced polypeptides were determined by electron ionization in a Penning cell of 4.7 and 9.4 T Fourier transform mass spectrometers. For z = 1+ and substance P, the found IE value of 11.0 +/- 0.4 eV is in agreement with that obtained earlier for ions generated with matrix-assisted laser desorption/ionization. For higher z, the following values were found: 11.7 +/- 0.3 eV for 2+ of [Arg-8]-vasopressin, 11.1 +/- 0.6 eV for 2+ of substance P, 12.2 +/- 0.7 eV for 2+ of renin substrate, 13.3 +/- 0.4 eV for 3+ of B-chain of insulin and 14.6 +/- 0.6 eV for 4+ and 15.1 +/- 0.4 eV for 5+ of melittin. It was found that 90% of existing IE data on polypeptides in the 1.0-3.5 kDa mass range are described with <or=0.5 eV uncertainty by the empirical equation IE(z) = 9.8 + 1.1z. The average IE increase of 1.1 eV/charge is attributed to Coulombic repulsion. The deduced ionization energy of a neutral polypeptide molecule, 9.8 +/- 0.3 eV, is consistent with literature expectations.
authors.affiliation: Department of Chemistry, University of Southern Denmark, Odense, Denmark.
authors.forename: Bogdan A
authors.initials: BA
authors.lastname: Budnik
authors.forename: Youri O
authors.initials: YO
authors.lastname: Tsybin
authors.forename: Per
authors.initials: P
authors.lastname: Håkansson
authors.forename: Roman A
authors.initials: RA
authors.lastname: Zubarev
mesh_terms: D000808:Angiotensinogen / Q000737:chemistry; D005583:Fourier Analysis; D007328:Insulin / Q000737:chemistry; D007477:Ions / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods*; D008555:Melitten / Q000737:chemistry; D010455:Peptides / Q000737:chemistry*; D011522:Protons; D013373:Substance P / Q000737:chemistry; D014667:Vasopressins / Q000737:chemistry
chemical_list: D007328:Insulin; D007477:Ions; D010455:Peptides; D011522:Protons; D014667:Vasopressins; D000808:Angiotensinogen; D008555:Melitten; D013373:Substance P