Cold Trap 9000
Cryogenic Trapping - trap your analytes of interest - at temperatures below -180° C
Gas chromatography (GC) involves the analysis of volatile organic compounds, that is, material that exist in the vapour phase, at least at the typical GC operationg temperatures between 40 and 300°C. Since Aroma compounds must, by their very nature, leave the food matrix and travel through the air to be perceived, they are generally exellent candidates for analysis by GC. Although many of these compounds may be solvent extracted, distilled, or otherwise isolated from the food matrix, it is frequently preferable to take advantage of their volatility and rely instead on techniques of headspace analysis.
Headspace sampling techniques are frequently divided into three broad categories: static headspace, dynamic headspace and purge and trap. In each case, however, the fundamental principle is the same - volatile analytes from a solid or liquid material are sampled by investigating of the atmosphere adjacent to the sample, leaving the actual sample material behind.
Analytes sampled by a headspace technique may be trapped using sorbents like Tenax, Graphitized Carbons or Polymers. However trapping by using a cryogenic trap has a lot of advantages. For trace-level applications the presence of background peaks from the sorbent may be a problem. This is accentuated in the analysis of heavier organics, since they require a higher desorption temperature to transfer from the trap to the gas chromatograph. Frequently the desorption parameters become a compromise between temperatures high enough to desorb the analytes efficiently but low enough to minimize artifacts. One solution is to eliminate the sorbent altogether and collect the analytes cryogenically.
The Cold Trap 9000 may be cooled down between 1 minute 30 seconds (GC Oven at 50°C) and 4 Minutes (GC Oven at
200°C). The speed in cooling down the Cold Trap 9000 is therefore related to the GC Oven Temperature. Heating up the Cold
Trap from -150°C up to 300°C may be performed in less then 20 seconds, which finally results in a heat up rate >1’350°C which
is fairely higher then any other Cold Trap available on the market.