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Theoretical fragmentation for each sphingolipid class was extrapolated from the pattern of reference compounds.
The resulting spectrum was compared to a theoretical fragmentation pattern.
For each of the precursors theoretical fragmentation (MS/MS) spectra were made using Masslynx software (Waters) and the LC-MS/MS data was compared to these theoretical fragmentation spectra.
The confidence value for each peptide was calculated based on the agreement between the experimental and theoretical fragmentation patterns.
Indeed, a peptide the theoretical fragmentation spectrum of which matches exclusively low intensity peaks cannot serve as convincing explanation of the experimental data.
Theoretical fragmentation patterns and mechanisms of selected metabolites were generated on the basis of chemical structure files using Mass Frontier 4.0 Spectral Interpretation Software (HighChem, Bratislava, Slovakia).
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Recorded MS/MS spectra were compared to theoretical fragmentations of a trypsinolysed PHY US417 protein (GenBank accession no. CAM58513).
In a recent study,(9) a correlation between percent fragmentation (number of observed fragment ions/number of theoretical fragment ions) and mass-to-charge ratio was reported.
For data interpretation the MS peaklists were imported into Biotools 3.0 (Bruker Daltonics) and compared to theoretical fragments from in silico digests of Hst-5, assuming different fragmentation mechanisms and taking into account missed cleavages.
a In silico fragmentation can be used to identify and rank unknown MS/MS spectra by matching theoretical fragments to experimental MS/MS spectra.
MASCOT's instrument setting was "ESI-QUAD-TOF" (Q-TOF) or "ESI-TRAP" (ion trap) for calculating theoretical peptide fragmentation spectra.
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