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- W1968478812 abstract "Charge reduction electrospray mass spectrometry (CREMS) reduces the charge states of electrospray-generated ions, which concentrates the ions from a protein into fewer peaks spread over a larger m/z range, thereby increasing peak separation and decreasing spectral congestion. An optimized design for a CREMS source is described that provides an order-of-magnitude increase in sensitivity compared to previous designs and provides control over the extent of charge reduction. Either a corona discharge or an alpha-particle source was employed to generate anions that abstract protons from electrosprayed protein cations. These desired ion/ion proton transfer reactions predominated, but some oxidation and ion-attachment reactions also occurred, leading to new peaks or mass-shifted broader peaks while decreasing signal intensity. The species producing these deleterious side-reactions were identified, and conditions were found that prevented their formation. Spectrometer m/z biases were examined because of their effect upon the signal intensity of higher m/z charge-reduced protein ions. The utility of this atmospheric pressure CREMS was demonstrated using a cell lysate fraction from E. coli. The spectral simplification afforded by CREMS reveals more proteins than are observed without charge reduction." @default.
- W1968478812 created "2016-06-24" @default.
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- W1968478812 date "2005-11-01" @default.
- W1968478812 modified "2023-09-29" @default.
- W1968478812 title "Controlling gas-phase reactions for efficient charge reduction electrospray mass spectrometry of intact proteins" @default.
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- W1968478812 doi "https://doi.org/10.1016/j.jasms.2005.07.019" @default.
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