Negative ion chemical ionization (Cl^-) mass spectra of amino acids

Abstract

Negative ion chemical ionization (Cl^-) mass spectra of the commonly occurring amino acids are simple and give information regarding molecular weight by the presence of [M + Cl]^- adduct in the case of simple amino acids and [M - H]^- in the case of amino acids containing additional polar groups. tert-Butyloxycarbonyl (BOC)-protected di^-, tri^- and tetrapeptides also given abundant [M + Cl]^- ions.