Abstract
A coating of poly(dimethylsiloxane) (PDMS) on a stir bar is typically used for sorptive extraction and preconcentration of nonpolar organic analytes from aqueous matrices. Here, we used sol–gel to synthesize three new coatings based on hydroxy-terminated PDMS crosslinked with 3-cyanopropyltriethoxysilane (CN) and phenyltriethoxysilane (PH) with three molar ratios of CN:PH (2:1, 1:1, and 1:2). The water contact angle of the coatings was below 90°. Cyanopropyl and phenyl groups were identified by infrared spectroscopy. The coatings were thermally stable up to 200°C. Also, they were stable to organic solvents and aqueous solutions at different pH. Glass stir bars were covered with the coatings to explore its potential application in stir-bar sorptive extraction. The test included polar antibiotics (sulfathiazole, sulfamethoxazole, trimethoprim, and chloramphenicol) dissolved in spiked water (pH 4.5) and organic solvent. Different experimental conditions were used to explore the capacity of the coatings to extract and preconcentrate the antibiotics. Unsatisfactory results of enrichment effect were obtained in aqueous solutions of antibiotics. In organic medium, the antibiotics were extracted and preconcentrated with the three coatings.
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Acknowledgments
This work was supported by Consejo Nacional de Ciencia y Tecnología, CONACyT (CB-167800). We thank Dr. José Antonio Azamar Barrios from Centro de Investigación y de Estudios Avanzados of IPN for letting us run the FTIR spectra of the coatings in his laboratory. In addition, we thank M.Sc. Maria Isabel Loría Bastarrachea from Centro de Investigación Científica de Yucatán for helping us with the thermogravimetric analysis.
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All authors contributed to the study conception and design. MAÁ-M was involved in investigation, visualization, and writing—original draft. YP-P helped in supervision, methodology, and validation. SM-P contributed to formal analysis and visualization. AÁ-O was involved in visualization. DM-R helped in conceptualization, supervision, methodology, and funding acquisition. All authors commented on previous versions of the manuscript, read and approved the final manuscript.
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Ávila-Martínez, M.A., Pérez-Padilla, Y., Medina-Peralta, S. et al. Preparation and characterization of polydimethylsiloxane containing cyano/phenyl groups for potential use in sorptive extraction. J Coat Technol Res 18, 1087–1094 (2021). https://doi.org/10.1007/s11998-021-00462-4
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DOI: https://doi.org/10.1007/s11998-021-00462-4