Facile preparation of carbon nanotube-based molecularly imprinted monolithic stirred unit
- PDF / 1,827,101 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 55 Downloads / 178 Views
RESEARCH PAPER
Facile preparation of carbon nanotube-based molecularly imprinted monolithic stirred unit Beatriz Fresco-Cala 1 & Soledad Cárdenas 1 Received: 30 November 2019 / Revised: 23 February 2020 / Accepted: 2 March 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A lab-made stirring extraction unit based on a selective monolithic solid was developed. The monolith was formed by interconnected carbon nanotubes which were covered by a thin polymeric layer, where specific cavities were generated to provide selective recognition sites in the material. To reach this goal, a water-in-oil (W/O) medium internal phase emulsion (40/60 w/ w%), was prepared and photopolymerized. The polymerization reaction took place in the organic or external phase containing the carbon nanotubes, polymeric monomers (cross-linker and functional monomer) and a molecule template. Therefore, it was possible to coat the nanotubes with a layer of molecularly imprinted polymer (MIP) with the target analyte while forming a monolithic and macroscopic structure. The developed selective monolithic stirring extraction units were applied for the determination of secbumeton and structurally related compounds (triazine herbicides) in peppermint mint and tea samples. Their adsorption capacity and selectivity were also compared with a non-imprinted polymer (NIP). Finally, the performance of the method was evaluated for quantitative analysis, achieving limits of detection (LODs) between 0.4 and 2.5 μg·L−1. The intra- and inter-day precision of the method was also evaluated as relative standard deviation, observing values which ranged from 3% to 9% and 9% to 15%, respectively. Keywords Methacrylate monoliths . Multi-walled carbon nanotubes . Selective recognition . Carbon nanoparticles . Triazine herbicides . Microextraction
Introduction Currently, analytical techniques face the challenge of achieving selective isolation of specific compounds in complex matrices. In this context, molecularly-imprinted polymers (MIPs) have great potential for solving selectivity issues [1, 2]. The formation of specific recognition sites in the polymer is induced via in-situ polymerization of functional monomers and
Published in the topical collection featuring Female Role Models in Analytical Chemistry. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00216-020-02570-3) contains supplementary material, which is available to authorized users. * Soledad Cárdenas [email protected] 1
Departamento de Química Analítica, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUNAN, Universidad de Córdoba, Campus de Rabanales, Edificio Anexo Marie Curie, 14071 Córdoba, Spain
cross-linkers in the presence of the analyte (template). Once the polymer has been formed, the template is removed, ideally leaving cavities that are complementary in function and shape to the target species [3]. Molecularly-imprinted polymers can be prepared following different polymerization strategies including bu
Data Loading...
