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13. Combinatorial method for surface-confined sensor design and fabrication

Author

Basabe Desmonts, M.L., Zimmerman, R.S., Reinhoudt, David, Crego Calama, Mercedes, Orellana, Guillermo, and Moreno-Bondi, Maria C.

Subjects
Surface (mathematics), Materials science, Fabrication, Microcontact printing, Monolayer, Molecule, Nanotechnology, METIS-229073, Combinatorial method, Small molecule, Microscale chemistry, IR-85866
Abstract

The procedure for the combinatorial fabrication of new sensing materials for cations and anions based on self-assembled monolayers (SAM) is discussed. A library of different sensitive substrates is generated by sequential deposition of fluorophores and small ligand molecules onto an amino-terminated SAM coated glass. The preorganization provided by the surface avoids the need for complex receptor design, allowing for a combinatorial approach to sensing systems based on individually deposited small molecules. Additionally the sensing system has been miniaturized to the microscale using microcontact printing and integrating the sensory SAMs on the walls of microchannels.

Published
2005

15. Fiberoptic Formaldehyde Field Sensors for Industrial Environments: Capitalizing on Evanescent-Wave Spectroscopy.

Author

Darder, M. Mar, Serrano, Luis A., Moreno-Bondi, Maria C., Alba, Miguel A., and Oreilana, Gullermo

Abstract

Formaidehyde is an indoor air pollut- ant that is widespread across many industries. The established implication of formaldehyde in respiratory condi- aptions and its carcinogenicity pose a risk to millions of workers in the wood and midtextile industries. We have developed an optical sensor based on the evanes- cent wave absorption of light by the absorptailored formaldehyde-sensitive clad- ding of a modified commercial plastic sensioptical fiber. This known spectroscopic technique, in combination with the in- expensive plastic optical fibers, has proven to be a powerful tool for form- aldehyde monitoring. Sensor proto- types following that principle are being detested in two Spanish plywood board production plants. The manufactured fiberoptic sensors have been designed materito meet the requirements of in situ, chemicontinuous, and unattended occupa- tional FA monitoring with a detection alternalimit of 250 pg/m3 (0.20 ppm). [ABSTRACT FROM AUTHOR]

Published
2020

16. Continuous solid-phase extraction and preconcentration of bisphenol A in aqueous samples using molecularly imprinted columns.

Author

San Vicente, Blanca, Villoslada, Fernando Navarro, and Moreno-Bondi, Maria C.

Subjects
POLYMERS, SOLVENTS, CHROMATOGRAPHIC analysis, FLUORESCENCE, STANDARD deviations, WATER analysis
Abstract

A bisphenol A (BPA) molecularly imprinted polymer, the composition of which was optimised using a chemometric approach, has been applied to the selective preconcentration of the template from aqueous samples. The selectivity of the polymer toward BPA and related compounds was evaluated chromatographically. The BPA-imprinted polymer was packed in a column and used for continuous on-column solid-phase extraction (MISPE) of aqueous samples followed by subsequent analysis by HPLC with fluorescence detection of the eluted fractions. The composition of the washing solvent applied in the MISPE procedure was optimised to favour the specific interactions of the MIP with BPA find to remove the non-selectively bound matrix components. The MISPE method has proven to be effective for selective preconcentration of BPA in aqueous samples (recoveries >84% obtained in the eluate for 10– 100 mL sample volumes) enabling detection and quantification limits of 1.0 and 3.3 ng mL-1, respectively (based on 25 mL sample size). Analytical recoveries were between 92 and 101% for river water samples spiked with known amounts of BPA (30, 60, and 80 ng mL-1): relative standard deviations (RSD) were lower than 5.0%. [ABSTRACT FROM AUTHOR]

Published
2004
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