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Des points quantiques de nitrure de carbone graphitique dérivés de l’acide tannique, en tant que nanosonde fluorescente «on-off-on» pour l’acide ascorbique par médiation au cuivre (II).

Une voie hydrothermale assistée par micro-ondes a été utilisée pour préparer des points quantiques en nitrure de carbone graphitique dérivivés avec de l'acide tannique fluorescent (TA). Les points résultants présentent une fluorescence bleue (mesurée au mieux à des longueurs d'onde d'excitation / émission de 350/452 nm) avec un rendement quantique atteignant ~ 44%. Le TA incorporé confère un comportement de commutation de fluorescence en ce sens que de très faibles concentrations de Cu (II) peuvent étouffer la fluorescence, tandis que (AA) peut la restaurer. On suppose que AA provoque la transformation de Cu (II) en Cu (I). Sur la base de ces résultats, une méthode fluorométrique a été conçue pour la détection des AA. La sonde permet de détecter les AA avec une limite de détection de 50 pM et une plage analytique linéaire allant de 0,1 à 200 nM de AA. Les échantillons réels et enrichis ont été testés avec succès par la sonde pour démontrer son applicabilité analytique. Résumé graphique Présentation schématique de points quantiques de nitrure de carbone graphitique fluorescents fonctionnalisés avec de l’acide tannique. Leur fluorescence est stoppée par Cu (2+) et récupérée par acide ascorbique (AA). Ceci est exploité dans un test avec une limite de détection picomolaire.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30631929


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