title: Selective silica-based sorbent materials synthesized by molecular imprinting for adsorption of pharmaceuticals in aqueous matrices.
abstract: The presence of pharmaceuticals in aqueous environmental matrices often requires efficient and selective preconcentration procedures. Thus, silicas (SILs) were synthesized by a molecular imprinting technique using an acid-catalyzed sol-gel process and the following drugs as templates: fluoxetine, gentamicin, lidocaine, morphine, nifedipine, paracetamol, and tetracycline. The materials were subjected to sorbent extraction assisted by ultrasonic treatment to remove the drugs and the consequent formation of molecular imprinted cavities. The surface area of the resulting materials ranged from 290 to 960 m(2)/g. Adsorption tests were performed with the molecular imprinting phases. In terms of the potential selectivity, the SILs were subjected to the adsorption of drugs from samples such as potable and surface water. The adsorption capacity remained in the range between 55 and 65% for both matrices, while for the nonimprinted SIL it remained between 15 and 20%.
authors: Instituto de Química UFRGS, Porto Alegre, Brazil.
authors: Everton C
authors: EC
authors: Morais
authors: Gabriel G
authors: GG
authors: Correa
authors: Rodrigo
authors: R
authors: Brambilla
authors: João Henrique Z
authors: JH
authors: dos Santos
authors: Adriano G
authors: AG
authors: Fisch
mesh_terms: D000327:Adsorption; D054802:Molecular Imprinting; D004364:Pharmaceutical Preparations / Q000737:chemistry / Q000302:isolation & purification*; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004364:Pharmaceutical Preparations; D011108:Polymers; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide