Surface molecularly imprinted core-shell nanoparticles and reflectance spectroscopy for direct determination of tartrazine in soft drinks

Autor(es)

Ruiz-Cordova, Gerson A. ; Villa, Javier E. L. ; Khan, Sabir ; Picasso, Gino ; Sotomayor, Maria Del Pilar Taboada

• Tipo de documento: Artigo Científico
• Fonte: Analytica Chimica Acta; v. 1159, p. 8-pg., 2021-03-30.

Resumo

The present work shows the synergistic application of reflectance spectroscopy and core-shell molecularly imprinted polymer (MIP) for rapid quantification of tartrazine in soft drinks. Studies evaluated the performance of the MIPs synthesized in the presence of silica nanoparticles unfunctionalized and functionalized with [3-(methacryloyloxy)propyl]trimethoxysilane. Although the use of functionalized silica nanoparticles promoted the highest adsorption capability of tartrazine, the material was found to be less selective when it was applied in real samples. Interestingly, the most accurate results were obtained via the application of the MIP synthesized in the presence of unfunctionalized silica nanoparticles (SiO2@MIP). The optimized core-shell MIP was also characterized by Raman spectroscopy and scanning electron microscopy. The use of direct reflectance spectroscopy in the analyte detection strategy after the template extraction from the MIPs resulted in faster and more accurate results than conventional UV -Visible spectroscopy. With regard to the analysis of the soft drink samples, no significant differences were found between the results obtained from the proposed reflectance spectroscopy-based technique and those obtained from the comparative high-performance liquid chromatography technique. Under optimized conditions, this method displayed a linear range of 1.0-12.5 mmol L-1 with LOD and LOQ values of 0.303 and 1.0 mmol L-1, respectively. The selectivity factor (b) ranged between 1.4 up to 264 showed better recognition of tartrazine in front of other dyes. Based on the results obtained, the proposed method is found to be suitable for rapid determination of tartrazine in food samples with complex matrices without the need of applying tedious sample preparation and cost-demanding instruments. (c) 2021 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 17/24196-2 - Desenvolvimento de sensores espectroquímicos ultrassensíveis e seletivos para a determinação de hormônios em amostras ambientais e fluidos biológicos
• Beneficiário: Javier Erick Lobatón Villa
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/00677-7 - RADes-MIP - preparação e síntese de materiais para desenvolvimento de dispositivos de análise rápida para monitoramento de poluentes emergentes usando polímeros biomiméticos altamente seletivos baseados na tecnologia de impressão molecular
• Beneficiário: Maria Del Pilar Taboada Sotomayor
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático