Stir Bar Sorptive Extraction (SBSE) is a solventless sample preparation technique introduced by Baltussen et al. [1] to extract organic analytes from aqueous samples and then applied to headspace sampling by Bicchi et al. [2] and by Tienpont et al. [3] (HeadSpace Sorptive Extraction- HSSE). SBSE and HSSE are based on the analyte sorption onto a thick film of polydimethylsiloxane (PDMS) coating a glass-coated magnet, marketed by Gerstel under the name Twister®. Both approaches have been shown to be very effective in recovering trace components from both liquid and vapour phases [2]. The major drawback of sorptive extraction is that the recovery capability of apolar PDMS is limited with polar analytes (i.e. low Ko/w), making difficult their sampling in complex matrices. To overcome this limit, new twisters coated with polyethyleneglycol-modified silicone (EG) and polyacrylate/polyethyleneglycol (PA) have recently been introduced and applied to SBSE sampling [4]. EG and PA twisters have here been applied to SBSE and HSSE sampling of dedicated standard mixtures to evaluate their recovery versus PDMS twisters taken as reference on analytes with different Ko/w and matrices of vegetable origin.
New medium-to-high polarity polymeric coatings for twisters for Stir Bar Sorptive Extraction (SBSE) and Headspace Sorptive Extraction (HSSE) applications to matrices of vegetable origin
SGORBINI, Barbara;RUOSI, MANUELA ROSANNA;CORDERO, Chiara Emilia Irma;LIBERTO, Erica;RUBIOLO, Patrizia;BICCHI, Carlo
2012-01-01
Abstract
Stir Bar Sorptive Extraction (SBSE) is a solventless sample preparation technique introduced by Baltussen et al. [1] to extract organic analytes from aqueous samples and then applied to headspace sampling by Bicchi et al. [2] and by Tienpont et al. [3] (HeadSpace Sorptive Extraction- HSSE). SBSE and HSSE are based on the analyte sorption onto a thick film of polydimethylsiloxane (PDMS) coating a glass-coated magnet, marketed by Gerstel under the name Twister®. Both approaches have been shown to be very effective in recovering trace components from both liquid and vapour phases [2]. The major drawback of sorptive extraction is that the recovery capability of apolar PDMS is limited with polar analytes (i.e. low Ko/w), making difficult their sampling in complex matrices. To overcome this limit, new twisters coated with polyethyleneglycol-modified silicone (EG) and polyacrylate/polyethyleneglycol (PA) have recently been introduced and applied to SBSE sampling [4]. EG and PA twisters have here been applied to SBSE and HSSE sampling of dedicated standard mixtures to evaluate their recovery versus PDMS twisters taken as reference on analytes with different Ko/w and matrices of vegetable origin.
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