Riassunto
La microestrazione in fase solida (SPME), introdotta nella seconda metà degli anni Novanta del secolo scorso, ha rivoluzionato le tecniche di estrazione e si è diffusa rapidamente grazie alla semplicità di utilizzo e alle ottime prestazioni (vedi cap. 7). Tuttavia, la quantità di fase estraente nella fibra SPME è molto limitata (una fibra di 100 μm di spessore corrisponde a un volume di circa 0,5 μL), di conseguenza l’efficienza di estrazione per soluti parzialmente solubili in acqua è piuttosto bassa. Per ovviare a tale limite, fu proposta nel 1999 la stir bar sorptive extraction (SBSE), una tecnica per l’estrazione e l’arricchimento di composti organici da matrici acquose in una fase liquida non miscibile (Baltussen et al, 1999), che utilizza ancorette magnetiche (stir bar, Fig. 8.1) incapsulate in una camicia di vetro e rivestite da uno strato absorbente (da 0,5 a 1 mm di spessore) di PDMS, con un volume di fase estraente 50–250 volte maggiore rispetto a quello utilizzato nelle fibre SPME. I principi teorici alla base della tecnica SBSE sono identici a quelli della SPME, già descritti in dettaglio nel cap. 7, al quale si rimanda.
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Purcaro, G., Moret, S. (2014). Stir bar sorptive extraction (SBSE) e head space sorptive extraction (HSSE). In: Il campione per l’analisi chimica. Food. Springer, Milano. https://doi.org/10.1007/978-88-470-5738-8_8
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