Comparison of gas phase extraction techniques
Analysis of coffee powder using DHS, HS-SPME and Static Headspace
In order to compare different gas phase extraction techniques, 100 mg samples of a ground coffee were analyzed using static headspace, headspace-SPME and DHS. Comparable extraction conditions were chosen:
|Temperature||40 °C||40 °C||40 °C|
|Extraktion time||30 min||30 min||10 min|
|Purge flow||20 ml/min|
It can be seen from the sample chromatograms and the bar graph showing relative peak areas (DHS response normalized to 100%), that DHS provided the highest response for the analytes that were determined.
For most analytes, DHS provided relative standard deviations well below 5%, which is equal to or better than the other techniques.