Ultrathin phenyl-functionalized solid phase microextraction fiber coating developed by sol-gel deposition

• Type: Article in International Scientific Journal
• Date: 2005

Authors

Azenha, M (Author) FCUP; Malheiro, C (Author) Other; Silva, AF (Author) FCUP

Journal

Title: Journal of Chromatography A

Vol. 1069

Pages: 163-172

ISSN: 0021-9673

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 41 Citations

Scopus - 39 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-000-41K

DOI: 10.1016/j.chroma.2005.02.013

Abstract (EN): A new sol-gel application for the development of SPME fibers is described. Phenyltrimethoxysilane (PTMOS) and methyltrimethoxysilane (MTMOS) were the sol-gel precursors used at different proportions, together with different water contents, catalyst and reaction time. It was observed that obtaining a good film quality was determinant for a good extracting fiber performance. The film thickness ranged 0.2-1 mu m and could not be increased by multi-coating processes. Apparently, a dense, non-porous microstructure was obtained. These coatings exhibited a strong hydrophobic character, as shown by the capability of extraction of long chain and apolar aromatic compounds, which, was comparable to that of the 100 mu m polydimethylsiloxane (PDMS) and 65 mu m carbowax-divinylbenzene (CW-DVB). The developed fiber has shown high thermal (350 degrees C) and organic solvent stability (ethanol, toluene and dichloromethane), thus bearing adequate characteristics to be associated to GC and potentialities that nay also envisage suitability for HPLC. The new fibers may be useful for the microextraction of non-polar compounds. although at trace levels and in simple matrixes only, due to the susceptibility to competition.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10