Disposable amperometric biotool for peanut detection in processed foods by targeting a chloroplast DNA marker
- Gamella Carballo, María 1
- Ballesteros Redondo, Isabel 1
- Ruiz-Valdepeñas Montiel, Víctor 1
- Sanchiz Giraldo, África 1
- Cuadrado Hoyo, Carmen 2
- Pingarrón Carrazón, José Manuel 1
- Linacero de la Fuente, María Rosario 1
- Campuzano, Susana 1
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1
Universidad Complutense de Madrid
info
- 2 Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (España)
ISSN: 0039-9140
Year of publication: 2024
Volume: 277
Issue: 126350
Pages: 126350
Type: Article
More publications in: Talanta
Abstract
This work reports the development and application of a disposable amperometric sensor built on magnetic microcarriers coupled to an Express PCR strategy to amplify a specific DNA fragment of the chloroplast trnH-psbA. The procedure involves the selective capture of a 68-mer synthetic target DNA (or unmodified PCR products) through sandwich hybridization with RNA capture probe-modified streptavidin MBs and RNA signaling probes, labeled using antibodies specific to the heteroduplexes and secondary antibodies tagged with horseradish peroxidase. Amperometric measurements were performed on screen-printed electrodes using the H2O2/hydroquinone system. Achieving a LOD of 3 pM for the synthetic target, it was possible to detect 2.5 pg of peanut DNA and around 10 mg kg−1 of peanut in binary mixtures (defatted peanut flours prepared in spelt wheat). However, the detectability decreased between 10 and 1000 times in processed samples depending on the treatment. The Express PCR-bioplatform was applied to the detection of peanut traces in foodstuff.
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