Higher-energy C-trap dissociation

Example Peptide ions, [HLVDEPQNLIK+2H], m/z 653.36, were selected as precursor ions, accumulated and isolated in the LIT until 10 ions were reached. With HCD setup (a) spectrum (c) was obtained. Using the dedicated octopole collision cell as depicted in (b) delivered the spectrum shown as (d) that exhibits stronger and more fragment ion signals in the lower m/z range. In particular, the immonium fragment ion of histidine can be observed at m/z 110 (Fig. 9.26) [123]. 

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Olsen, J.V., Macek, B., Lange, O., Makarov, A., Horning, S., and Mann, M. (2007). Higher-energy C-trap dissociation for peptide modification analysis, Nature Methods, 4,709-712. 

The effect of TOS on the product distribution during the pyrolysis of R22 over CU-AIF3 catalyst is shown in Fig. 3. The amoimt of halogen ion trapped in NaOH solution was determined by IC. The concentration of Cl formed during the pyrolysis of R22 was higher than the concentration of F at all TOS. This result is a consequence of the facile cleavage of the C-Cl bond in comparison to the C-F bond. Bond dissociation energy for the C-element of R22 is followed by the order C-C1[Pg.235]

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