title: Preparation and characterization of polydimethylsiloxane/poly(vinylalcohol) coated solid phase microextraction fibers using sol-gel technology.
abstract: The applicability of a composite composed of polydimethylsiloxane (PDMS) and poly(vinyl alcohol) (PDMS/PVA) as coating sorbent for SPME fibers is demonstrated here. Fused silica (FS) fibers were coated with PDMS/PVA composite through a sol-gel process, using methyltrimethoxysilane as reticulating agent. The chemical and physical properties of the sol-gel PDMS/PVA composite were determined by infrared spectroscopy and thermogravimetric analysis. Electron scanning microscopy of the prepared fibers, showed that the coating obtained was highly microporous, having a thickness of approximately 5 microm. The fibers were tested for the headspace extraction of several organic compounds (o-xylene, naphthalene, ethyl caprate, p-chlorotoluene and PCB) prior to gas chromatographic analysis. The extractive capacity of the PDMS/PVA coating was found to be superior to that of pure conventional PDMS fibers.
authors.affiliation: Institute of Chemistry, Campinas State University (Unicamp), CP 6154-13084-971 Campinas, São Paulo, Brazil.
authors.forename: Alexandre Leite
authors.initials: AL
authors.lastname: Lopes
authors.forename: Fabio
authors.initials: F
authors.lastname: Augusto
mesh_terms: D002849:Chromatography, Gas; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D005782:Gels; D008855:Microscopy, Electron, Scanning; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D012828:Silicones / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D004129:Dimethylpolysiloxanes; D005782:Gels; D012828:Silicones; C013830:baysilon; D011142:Polyvinyl Alcohol