Titania-based coating for capillary microextraction
AssigneeUniversity of South Florida
InventorsAbdul Malik, Tae-Young Kim
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Abstract
A method is presented describing in situ preparation of the titania-based sol-gel PDMS coating and its immobilization on the inner surface of a fused silica microextraction capillary. Sol-gel titania-poly (dimethylsiloxane) (TiO2-PDMS) coating was developed for capillary microextraction (CME) to perform on-line preconcentration and HPLC analysis of trace impurities in aqueous samples. The sol-gel titania-based coatings demonstrated strong pH stability and enhanced extraction capability over other commercially availble GC coatings. Extraction characteristics of a sol-gel titania-PDMS capillary remained practically unchanged after continuous rinsing with a 0.1 M NaOH solution (pH=13) for 12 hours.
Claims7
A microextraction capillary for the preconcentration of trace analytes in a sample, the microextraction capillary having a tube structure and an inner surface, the inner surface further comprising a hybrid organic-inorganic sol-gel titania-based coating made from two or more sol-gel precursors, wherein the sol-gel titania-based coating forms the stationary phase for the microextraction of the analytes and wherein the sol-gel titania-based coating is chemically bonded to the fused-silica inner surface of the capillary.
Dependencies are inferred from the claim text.