ISTD Quantitation

It’s quite easy to use internal standards (ISTD) for the quantitation of chromatograms in OpenChrom. The first step is to open a chromatogram, detect and integrate peaks. Please open the “Chromatogram Peaks” perspective then.

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Please select the view “Peak ISTD (MSD)” and then select a peak. By clicking on the (+) button, the peak can be flagged with the internal standard information.

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In this case, the selected peak represents a concentration of 12.0 mg/g.

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It’s possible to set several internal standards.

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The next step is to quantitate one or all peaks of the chromatogram selection. Use the menu entry “Chromatogram > Quanitifier > Peak Quantifier > Internal Standards (ISTD) > Quantify All Peaks“.

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The results for each peak will be displayed in the “Peak Quantitation Entries (MSD)” view.

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The view will be updated as soon as another peak is selected.

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All quantitation results are saved when using the *.ocb chromatogram format. This enables to review the data whenever you want. Additionally, OpenChrom offers a report to export the data to text format. Use the menu entry “Chromatogram > Reports > OpenChrom Report“.

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The data is exported in the following format:

PEAK QUANTITATION RESULTS
——————————
[#]    Name    ChemicalClass    Concentration    ConcentrationUnit    Area    Description    Ion

[12]    Acetic Acid    Acids    2.90922    mg/g    5433521.52496        TIC
[12]    Furfural        2.34891    ppm    5433521.52496        TIC

[13]    Acetic Acid    Acids    12.92843    mg/g    24146306.8746        TIC
[13]    Furfural        10.43846    ppm    24146306.8746        TIC

See, e.g. the following (PDF) snippet: ap-1413

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