JMSSJ On-line

JMSSJ On-line, Vol. 46 (1998) No. 5, pp. 454-458

Effects of Amines on the Formation of Molecular Adduct Ions of Methyl Hydroperoxyoleates in Atmospheric Pressure Chemical Ionization Mass Spectrometry		>> Full Text PDF >> References
*Yoshiyuki MOCHIDA,^a) Yukio YOKOYAMA,^b) and Shigeo NAKAMURA^a)** ^a) Department of Applied Chemistry, Faculty of Engineering, Kanagawa University (2-27 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan)* ^b) Laboratory of Analytical Chemistry, Faculty of Engineering, Yokohama National University (79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan)

The effects of amines on the formation of molecular adduct ions of methyl hydroperoxyoleates (OMH) in atmospheric pressure chemical ionization mass spectrometry were investigated. The short-chain primary amines such as methylamine and ethylamine were more effective than ammonia on suppressing the thermal decomposition of OMH, and provided abundant [M+H+L]⁺ type ions (L: each amine molecule). The secondary and tertiary amines were unsuitable for the purpose in spite of their high basicity, probably due to the steric interference. Aromatic and heterocyclic amines were also ineffective. The formation of amine adduct to OMH in liquid and/or condensed phases depends on both basicity and stereochemistry of each amine.

Key words: APCI mass spectrometry, Methyl hydroperoxyoleates, Thermal decomposition, Methylamine adduct, Steric interference