Secondary ion mass spectra of the neuropeptides leucine‐enkephalin and methionine‐enkephalin | Zendy

Westmore J. B. | Zendy; Ens W. | Zendy; Standing K. G. | Zendy

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Secondary ion mass spectra of the neuropeptides leucine‐enkephalin and methionine‐enkephalin

Author(s) -

Westmore J. B.,

Ens W.,

Standing K. G.

Publication year - 1982

Publication title -

biomedical mass spectrometry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.475

H-Index - 121

eISSN - 1096-9888

pISSN - 0306-042X

DOI - 10.1002/bms.1200090309

Subject(s) - ion , chemistry , mass spectrum , leucine , methionine , peptide , amino acid , mass spectrometry , spectral line , molecule , analytical chemistry (journal) , biochemistry , chromatography , physics , organic chemistry , astronomy

Positive and negative secondary ion mass spectra obtained by bombardment of thin films of leucine‐enkephalin and methionine‐enkephalin with a pulsed beam of Cs + ions of energy 5–15 keV were recorded using a time‐of‐flight mass spectrometer. Many of the secondary ions are metastable. The spectra contain a wealth of information, including the following important features: (i) ions characteristic of the intact molecule, from which the molecular weight may be deduced; (ii) ions diagnostic of the amino acid composition of the peptide; (iii) ions diagnostic of the sequence of amino acids in the peptide.

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