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|Type:||Artigo de periódico|
|Title:||Sol-gel Molecular Imprinted Ormosil For Solid-phase Extraction Of Methylxanthines|
|Author:||da Costa Silva R.G.|
|Abstract:||A organically modified molecularly imprinted silica (MIS), selective for methylxanthines, was prepared using a simple sol-gel procedure. Caffeine was used as template; 3-aminopropyltrimethoxysilane (APTMS) as functional monomer and tetraethyl orthosilicate (TEOS) as reticulating agent. The material was packed on solid-phase extraction (SPE) cartridges and evaluated with aqueous test samples, natural water and human urine; a quantitative method for methylxanthines in water, using SPE cartridges packed with the MIS coupled with HPLC-UV was developed. The MIS was highly specific for methylxanthines, with an imprinting factor of (20.5 ± 1.9). The analytical method resulted in detection limits of 85 μg L-1 for theobromine, 44 μg L-1 for theophylline and 53 μg L-1 for caffeine. © 2006 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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