Product/Service

Gerstel Twister ™

Source: GERSTEL Inc.
Stir Bar Sorptive Extraction using the GERSTEL TWISTER(tm) is a powerful, easy to use technique that combines the best attributes of SPE and SPME.
The GERSTEL TWISTER(tm) Stir-Bar Extraction Technique is a Fast, Simple, Sensitive, and Efficient means of Analyte Extraction without Solvents.

Features:

  • Twister is an innovative technique for the extraction of organic compounds from aqueous matrices for GC analysis. The GERSTEL TWISTER(tm) consists of a magnetic stir bar encapsulated in glass and coated with a preconditioned layer of polydimethylsiloxane
  • Sample extraction simply involves placing TWISTER(tm) in a vial of sample & allowing it to stir for 30-120 min. The stir bar is then placed in glass thermal desorption tube, which is placed in ThermoDesorption system where analytes are thermally desorbed.
  • Desorption conditions are application dependant, but are typically between 150-300 degrees C for 5-15 min.
  • A significant portion of the technique's performance is due to the use of the GERSTEL ThermoDesorption System (TDS), which allows for splitless analyte transfer to the GC column with no band broadening.
  • This is possible due to the TDS's use of the GERSTEL CIS 4 inlet as a cryofocusing trap and a unique pneumatic configuration. The resulting chromatograms show excellent peak shape and resolution over a full range of compound volatility and functionality.
  • Detection limits below the parts-per-trillion level have been seen.
Stir Bar Sorptive Extraction using the GERSTEL TWISTER(tm) is a powerful, easy to use technique that combines the best attributes of SPE and SPME. We have performed extensive trials of this technique with major manufacturers of prepared foods and the savings in time and solvents are dramatic. The system can be used for fast quality control of food, beverage and fragrance samples and for trace analysis in environmental, food, and biomedical samples.

GERSTEL Inc., Caton Research Center, 1510 Caton Center Drive, Suite H, Baltimore, MD 21227. Tel: 410-247-5885; Fax: 410-247-5887.