You can see below 2 chromatograms of the same fragrance, controlled several months after (bottom) the first control (top). It shows a shifting of all the peaks:
A 3 minutes shift is visible on the last peaks due to the ageing of the column.
Despite this non linear shifting, GC-LC CONCORDANCE software is able to detect similarities and differences between these two chromatograms with 192 peaks and provides a report with the differences between these two chromatograms. Both red marks in the window shows the non concordance between the two products – Coumarine in the standard and allyl cyclohexyl propionate in the sample.
The report (short mode) shows only differences between these two chromatograms with only peaks > 0.1% as set in the settings as well as differences out of the tolerances defined in the settings.
E.g. here for peaks between:
– 0.1 and 1%, the difference of tolerance is set to 40%
– 1% and 10%, tolerance is set to 15%
– 10% and 100%, tolerance is set to 3%
Chromatographic fingerprint comparisons is now possible in an automatic, fast, reliable and precise way with GC-LC CONCORDANCE. Chemists, you are now free from the laborious visual control of all peaks of your chromatograms and can then concentrate on the relevant analysis of the differences of your products.
See below the curves of automatic compensation of the not linear shifting of compounds (3 minutes on the last peaks!), after mathematical treatment.