Mass spectroscopic studies of protonation to amino-acid molecules in atmospheric pressure spray

Positive ions produced by an atmospheric pressure spray from aqueous solutions of alanine, leucine, threonine, serine, aspartic acid, and glutamic acid are detected with a double focusing mass spectrometer to study the origin of the observed ions. The relative intensities of the protonated amino-aci...

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Bibliographic Details
Published inChemical physics letters Vol. 204; no. 1-2; pp. 152 - 156
Main Authors Hirabayashi, Atsumu, Takada, Yasuaki, Kambara, Hideki, Umemura, Yuta, Ito, Haruhiko, Kuchitsu, Kozo
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 12.03.1993
Elsevier Science
Subjects
Aerosols
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Glutamic acid
Alanine
Threonine
Spraying
Serine
Proton transfer
Leucine
Experimental study
Aminoacid
Protonation
Aspartic acid
Aqueous solution
Mass spectrometry
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Summary:Positive ions produced by an atmospheric pressure spray from aqueous solutions of alanine, leucine, threonine, serine, aspartic acid, and glutamic acid are detected with a double focusing mass spectrometer to study the origin of the observed ions. The relative intensities of the protonated amino-acid molecules (MH+ are found to be grouped into three: (alanine and leucine)> (threonine and serine)>(aspartic and glutamic acids). This trend is ascribed to the difference in the protonation to M in the charged droplets during the spray. A qualitative explanation is proposed on the basis of the Gibbs energy of hydration.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(93)85620-4