A Study on Alkali Metal Adduct Ions of Progesterone Compounds in Fast Atom Bombardment Mass Spectrometry

When progesterone compounds were mixed with an appropriate of NaCl and KCl, in the high mass region of their fast atom bombardment mass spectra appeared two strong ion peaks M+Na⁺ and M+K⁺. This pair of adductions were easily recognized due to the fact that they were very strong (their abundances were higher than that of corresponding M+H⁺ in several tens fold) and their mass difference was 16 amu and may give exactly the information about molecurlar weight.