Application Note: Sniff & Trap fractionation and ODP Performance Checkout

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Published: 15 September 2021

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To study fragrances or flavours in food and beverages, sensory analysis using human assessors is essential. The odour character of a compound cannot be deduced from its chemical or physical properties. To correctly determine the odour character of each compound in the fragrance or flavour mixture, GC-MS/O is often employed to determine aroma compounds simultaneously by GC-MS and by a human assessor at the Olfactory Detection Port.

Instead of sniffing eluting compounds at the ODP, they can be trapped and stored on an adsorbent tube. Such a function can be useful for a variety of purposes: (1) to keep the trapped compound or fraction for later sensory evaluation; (2) to perform multiple collections of the same compound(s) over a series of GC runs for subsequent enhanced detection, MS identification or sensory perception at the ODP; (3) to re-inject the trapped compounds onto a column with different polarity (also known as offline GC-heartcutting); (4) Selective trapping of certain fractions of the chromatogram to study synergy effects.

Use of the ODP 4 fitted with adsorbent tube adaptor is studied in this application note and the trapping efficiency determined.

A new performance checkout procedure for the ODP 4 is described and carried out.