Enrichment Fraction

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Found in the PeakGroups data format.

A weighted average of the fraction of labeled atoms across all peaks in a PeakGroup detected in a particular sample. E.g. The fraction of labeled carbons in lysine detected in a spleen sample.

enrichment_fraction = ∑_peak(fraction * labeled_count) / element_count

Where:

• ∑_peak stands for the sum across all peaks in a PeakGroup for a particular compound.
• fraction: See Fraction
• labeled_count is the number of labeled atoms (i.e. isotopomers) of a particular element in any one peak.
• element_count is the total number of atoms of a particular element in any one compound (labeled or not).

See the Enrichment Fraction column of the PeakGroup table in this Enrichment Example.