Abstract
A high resolution Fourier transform ion cyclotron resonance (FTICR) mass spectrometer is used for characterizing the fragmentation of chlorophyll-a. Three tandem mass spectrometry (MS/MS) techniques, including electron-induced dissociation (EID), collisionally activated dissociation (CAD), and infrared mutiphoton dissociation (IRMPD) are applied to the singly protonated chlorophyll-a. Some previously unpublished fragments are identified unambiguously by utilizing high resolution and accurate mass value provided by the FTICR mass spectrometer. According to this research, the two long aliphatic side chains are shown to be the most labile parts, and favorable cleavage sites are proposed. Even though similar fragmentation patterns are generated by all three methods, there are much more abundant peaks in EID and IRMPD spectra. The similarities and differences are discussed in detail. Comparatively, cleavage leading to odd electron species and H• loss both seem more common in EID experiments. Extensive loss of small side groups (e.g., methyl and ethyl) next to the macrocyclic ring was observed. Coupling the high performance FTICR mass spectrometer with contemporary MS/MS techniques, especially IRMPD and EID, proved to be very promising for the structural characterization of chlorophyll, which is also suitable for the rapid and accurate structural investigation of other singly charged porphyrinic compounds.
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Acknowledgments
The authors acknowledge support for this work by the Chancellor’s International Scholarships of Warwick, Warwick Centre for Analytical Science (EPSRC funded EP/F034210/1), the University of Warwick, and the Department of Chemistry. Special thanks are due to Dr. David Kilgour for his help with the phasing work and discussion. The authors also thank Yulin Qi, Pilar Perez-Hurtado, Rebecca Wills, Andrea Lopez-Clavijo, Tzu-yung Lin, Andrew Soulby, and Samantha Benson for their help.
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Wei, J., Li, H., Barrow, M.P. et al. Structural Characterization of Chlorophyll-a by High Resolution Tandem Mass Spectrometry. J. Am. Soc. Mass Spectrom. 24, 753–760 (2013). https://doi.org/10.1007/s13361-013-0577-1
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DOI: https://doi.org/10.1007/s13361-013-0577-1