New Twister for Wide Polarity Range

A new combined ethylene glycol (EG)-Silicone Twister enables efficient extraction of both nonpolar
and a range of polar compounds.

Stir Bar Sorptive Extraction (SBSE) using the patented Gerstel Twister® is an accepted and highly efficient extraction technique for the determination of organic compounds in aqueous and other samples. The new combined ethylene glycol (EG)-Silicone sorbent phase complements the standard PDMS phase, enabling extraction of a much wider range of compounds from aqueous samples. SBSE with the EG-Silicone Twister is performed just like any other SBSE extraction: Place the Twister in the sample and allow it to stir for 20 minutes to one hour. While stirring, the Twister extracts non-polar and a range of polar compounds and these are concentrated in the sorbent phase. The Twister is removed, rinsed with DI water, dabbed dry using lint-free paper tissue, and placed in a thermal desorption tube for desorption in a Gerstel Thermal Desorption System (TDS) or Thermal Desorption Unit (TDU). Analyte focusing, separation, and determination follows in the GC/MS system. The EG-Silicone Twister especially improves  the extraction of phenols and other compounds that form hydrogen bonds as hydrogen donors.