title: Sol-gel-coated oligomers as novel stationary phases for solid-phase microextraction.
abstract: Amphiphilic and hydrophilic oligomers were synthesized and coated on fused silica capillaries using a sol-gel technique. Sol-gel-coated capillaries were evaluated for the solid-phase microextraction and preconcentration of a wide variety of non-polar and polar analytes. Both types of coatings were stable under high temperature (up to 280 degrees C). The extraction efficiency of the sol-gel coatings was evaluated for the extraction of both non-polar and polar analytes, including organochlorine pesticides, triazine herbicides, estrogens and alkylphenols (APs) and bisphenol-A (BPA). Compared with commercially available solid-phase microextraction (SPME) adsorbents such as poly(dimethylsiloxane)divenylbenzene and polyacrylate, the new materials showed comparable selectivity and sensitivity towards both non-polar and polar analytes. The new coatings gave good linearity and detection limits. For example with triazines, a detection limit of <0.005 microl l(-1), precision from 5.0 to 11.0% (n = 6) and linearity of the calibration plots (0.5 to 50 microl l(-1)) were obtained. The sol-gel coated SPME capillaries were used for the determination of triazine herbicides in reservoir water samples collected in Singapore.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
authors.forename: Chanbasha
authors.initials: C
authors.lastname: Basheer
authors.forename: Subbiah
authors.initials: S
authors.lastname: Jegadesan
authors.forename: Suresh
authors.initials: S
authors.lastname: Valiyaveettil
authors.forename: Hian Kee
authors.initials: HK
authors.lastname: Lee
mesh_terms: D004967:Estrogens / Q000032:analysis; D005782:Gels; D006540:Herbicides / Q000032:analysis; D008855:Microscopy, Electron, Scanning; D010636:Phenols / Q000032:analysis; D011108:Polymers / Q000737:chemistry*
chemical_list: D004967:Estrogens; D005782:Gels; D006540:Herbicides; D010636:Phenols; D011108:Polymers