English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Ion/ion reactions have in recent years seen widespread use in ion activation methods such as electron transfer dissociation (ETD) tandem mass spectrometry (MS/MS) as well as in charge manipulation of highly charged peptides/proteins and their fragments by proton transfer reaction (PTR). These techniques have, in combination, enabled top-down proteomics on limited-resolution benchtop mass spectrometry platforms such as quadrupole ion traps. Anions generated by chemical ionization of fluoranthene are often used for both ETD and PTR reactions; the radical anion of fluoranthene (m/z 202) for ETD and the closed-shell anion resulting from H atom attachment to the radical anion (m/z 203) for PTR. Here we use infrared ion spectroscopy in combination with density functional theory calculations to identify the structures of these reagent anions. We establish that the m/z 203 PTR reagent anion possesses a structure that deviates from what has been suggested previously and provides some insight into the reaction mechanism involved in PTR.

Structures of Fluoranthene Reagent Anions Used in Electron Transfer Dissociation and Proton Transfer Reaction Tandem Mass Spectrometry