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|Title:||A comparison of the positive and negative ion mass spectra of peptides from the dorsal glandular secretion of the Australian red tree frog, Litoria rubella|
|Citation:||Rapid Communications in Mass Spectrometry, 1996; 10(10):1243-1247|
|Publisher:||JOHN WILEY & SONS LTD|
|Abstract:||The collision-induced tandem mass spectral data for MH+ and [M-H]- ions from six bio-active peptides from Litoria rubella are compared. Backbone cleavages of [M-H]- ions provide sequencing information for five of the peptides [e.g. Phe Pro Trp Leu (NH2) and pGlu Phe Pro Trp Leu (NH2)] and in these cases, the negative-ion spectra are as informative as the positive-ion spectra. Side-chain cleavages are also noted in these spectra. For example, (i) when Trp is present, the loss of C9H7N (129 u) competes with the backbone cleavages, and (ii) the [M-H]- ion of Ile Glu Phe Phe Thr (NH2) undergoes facile side-chain fragmentation [loss of H2O (from Glu) and MeCHO (from Thr)], but does not form any conventional backbone-cleavage ions.|
|Keywords:||Animals; Anura; Amino Acids; Peptides; Spectrometry, Mass, Fast Atom Bombardment; Amino Acid Sequence; Molecular Sequence Data; Mass Spectrometry|
|Appears in Collections:||Chemistry publications|
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