Since the introduction of SPDE( different users had the desire to be able to extract volatile substances even better. Since the SPDE syringe needle usually works at ambient temperatures or at sample temperature during the extraction, volatile substances are poorly extracted, compared to less volatile components. That is a limitation for SPME too. On the contrary to this method, SPDE( will accomplish those applications by means of intensive needle cooling.

With use of the SPDE Extraction Cooler very volatile components can easily be extracted without any problems. Figure 1 shows a schematic drawing of the extraction cooler, basicly by using a Peltier-cooler for the SPDE needle. The cooler is installed on top of the CHROMTECH single magnet mixer (SMM) (fig. 2) and reaches temperature differences of up to 40°C. This means the needle can cool down to -15°C while working at an ambient temperature of 25°C.