In this application note four PDMS based sorptive extraction methods, including SPME, SPME Arrow, SBSE and SA-SBSE are compared for the extraction of model aroma compounds from water and for aroma profiling of roasted green tea. The comparison was made using the same samples and keeping the analytical conditions constant for all techniques.
The comparison clearly demonstrates that the highest recoveries are obtained using SA-SBSE with a PDMS Twister®, swollen in dichloromethane/diisopropylether, especially for the most polar, hydrophilic compounds with octanol-water partitioning coefficients below 2. SA-SBSE also results in the most extended coverage of aroma compounds in real matrices and in more accurate identification.