Characterization of betaines using electrospray MS/MS.

Area of Science:

• Analytical Chemistry
• Biochemistry
• Plant Science

Background:

• Betaines are vital natural compounds functioning as compatible solutes and osmoprotectants.
• Their quaternary ammonium group presents analytical challenges for mass spectrometry.
• Traditional methods like fast atom bombardment and plasma desorption mass spectrometry (PDMS) have been employed.

Purpose of the Study:

• To evaluate electrospray ionization mass spectrometry (ESI-MS) as a method for betaine analysis.
• To compare ESI-MS performance with established PDMS techniques.
• To explore the structural elucidation capabilities of ESI-MS for betaines.

Main Methods:

• Analysis of authentic betaine standards using ESI-MS and PDMS.
• Analysis of betaines purified from plant extracts via ion exchange chromatography, followed by ESI-MS.
• MS/MS experiments on selected parent ions using ESI-MS.

Main Results:

• ESI-MS yielded results comparable to PDMS for betaine standards and plant-derived betaines.
• ESI-MS demonstrated the ability to generate product ion spectra via MS/MS.
• This MS/MS capability allows for structural information acquisition to differentiate between isobaric ions.

Conclusions:

• ESI-MS is a suitable and effective technique for the analysis of betaines.
• ESI-MS offers a significant advantage over PDMS due to its MS/MS functionality for structural characterization.
• This method facilitates the discrimination of betaines with identical masses, improving analytical accuracy.