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

✍ Scribed by Atsumu Hirabayashi; Yasuaki Takada; Hideki Kambara; Yuta Umemura; Haruhiko Ito; Kozo Kuchitsu

Book ID
103033018
Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
430 KB
Volume
204
Category
Article
ISSN
0009-2614

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✦ Synopsis

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 imo three: (alanine and leucine) > (threonine and serine) 3 (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.

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