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Your search keyword '"Nouws, Henri P.A."' showing total 29 results
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29 results on '"Nouws, Henri P.A."'

28. ELECTROANALYTICAL STUDY OF THE PESTICIDE ASULAM.

Author

Nouws, Henri P.A., DeLerue-Matos, Cristina, Lima, Jose L.F.C., Garrido, E. Manuela, Vincke, Pieter, and Maes, Noel A.

Subjects
*HERBICIDES, *CARBON electrodes, *SQUARE waves, *VOLTAMMETRY, *METAL analysis, *ANALYTICAL chemistry
Abstract

The electrochemical behaviour of the herbicide Asulam wets studied by cyclic and square wave voltammetry. Asulam may be irreversibly oxidised at a glassy carbon electrode. Maximum currents were obtained at pH = 1.9 in aqueous electrolyte solution. Based on the electrochemical behaviour of Asulam, two analytical methodologies were developed for its determination in water samples, using square wave voltammetry (SWV) and flow injection analysis (FIA) coupled with an amperometric detector. Limits of detection of 7.1 x 10[sup-6] molL[sup-1] and 1.2 x 10[sup-8] mol L[sup-1] for SWV and FIA respectively, were achieved. Repeatability was calculated by assessing the relative standard deviation (%) for 10 consecutive determinations of one sample. The found values were 2.1% for SWV and 5.0% for FIA. Validation of the results provided by SWV and FIA methodologies was performed by comparison with results from an HPLC-DAD technique. Good relative deviations were found (< 5%). Recovery trials were performed to assess the accuracy of the results and the obtained values were between 84% and 107% for both methods. [ABSTRACT FROM AUTHOR]

Published
2002
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29. Voltammetric immunosensor based on oxidized carbon nanotubes/MnFe2O4 hybrid nanoplatform for amplified detection of celery (Apium graveolens).

Author

Teixeira, Joana S., Freitas, Maria, Oliveira, Catarina, Pereira, Clara R., Delerue-Matos, Cristina, and Nouws, Henri P.A.

Subjects
*CELERY, *FOOD allergy, *MAGNETICS, *CARBON nanotubes, *DETECTION limit
Abstract

Celery is a food allergen that must be included in the ingredient list of commercial food products in the European Union. This is a challenge for the food industry because of potential cross-contamination and undeclared ingredients because of their low concentrations. So, the food industry requires expedited high-performance analytical methods. The development, validation and application of a magnetic nanomaterial-based voltammetric immunosensor is reported to quantify a major celery allergen (Api g 1), achieving a low limit of detection (32 pg·mL−1, in a 40-μL sample). The applicability of the biosensor was evaluated by analysing twenty food products and the lowest Api g 1 content (1.1 ± 0.9 mg·kg−1) was quantified in a cooked sample. The selectivity of the method and the interference of similar fresh products (e.g. , parsley, basil) were evaluated. This portable and easy-to-use biosensor can be a fit-for-purpose solution to tackle a major problem for the food industry. [Display omitted] • CNT_O@MnFe2O4 was incorporated in a disposable immunosensor for Api g 1. • 20 fresh, powdered, liquid, or cooked foods were successfully analysed in 2h20min • Biosensor was shown to be fit-for-purpose to track Api g 1 in commercial foods [ABSTRACT FROM AUTHOR]

Published
2024
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