GERSTEL GmbH & Co.KG - Twister / Stir Bar Sorptive Extraction SBSE

The Gerstel-Twister allows analysis of organic compounds from aqueous matrices by Stir Bar Sorptive Extraction (SBSE): Faster than with conventional techniques, omitting time-costly preparation steps and solvents and up to 1000´ more sensitive than SPME. The GERSTEL-Twister looks like a conventional magnetic stirring rod, and works the same - except for one small difference: While it is stirring, it adsorbs and concentrates the organic contents onto its coating of polydimethylsiloxane (PDMS). It makes no difference if the carrier solution is drinking or waste water, body fluids or beverages.

GC-Analyis:
Twister's special feature: After stirring, it can be directly transferred to the Thermal Desoption Unit TDU or to the Thermal Desorption System TDS. This means that the thermal desorption, chromatography and subsequent detection of the organic compounds adsorbed on the PDMS coating are performed directly on Twister.

LC-Analysis:
Alternatively, non volatile or thermally unstable compounds can be extracted from the Twister by TwisterBackExtraxtion TBE and subsequently analyzed by LC or LC/MS.

• Up to a 1000 times lower detection limits than SPME
• Quantitative, with large linear range
• Several samples may be extracted at the same time
• Requires minimal time and labor outlay
• Thermal desorption and GC/MS/AED analysis are carried out automatically

• Food and luxury foods, especially beverages
• Flavors and perfumes
• Environmental analysis of water or waste water and air
• Biomedicine, including body fluids
• Quality control
• Residue