Letter: Some more aspects of formation and stability of the protonated serine octamer cluster

Eur. J. Mass Spectrom. 12, 63–70 (2006)
DOI: 10.1255/ejms.783

Letter: Some more aspects of formation and stability of the protonated serine octamer cluster

Ulf Mazurek
Department of Physical Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel. E-mail: ykv@chem.ch.huji.ac.il

ABSTRACT:

The formation of protonated serine octamer clusters from homochiral and heterochiral monomer solutions was investigated. The well-established preference for homochiral cluster formation was found to originate from collision-induced dissociation of the less stable ion population B prior to reaching the mass spectrometer’s analyzer cell. In addition, collision-induced dissociation experiments were undertaken to investigate the relative stabilities of populations A and B and infrared multi-photon dissociation experiments addressed the relative stabilities of the protonated serine octamer cluster and its metaclusters. Isotopically-labeled serine was used throughout the experiments.

Keywords: ion cyclotron resonance, ICR, FT-ICR-MS, infrared multi-photon dissociation, IRMPD, serine octamer, amino acid clusters, isotopically-labeled compounds

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