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Points de carbone fluorescents allumés / éteints provenant de déchets de thé: leurs propriétés, leur pouvoir antioxydant et leur détection sélective de CrO42-, Fe3 +, de l’acide ascorbique et de la L-cystéine dans des échantillons réels.

Dans ce travail, nous avons décrit une méthode hydrothermale à base de plantes économique pour la synthèse en vert unique de points de carbone solubles dans l'eau (CD-thé) en utilisant un extrait de thé extrait comme source de carbone. Les CD-thé synthétisés ont été caractérisés par UV-visible, fluorescence, FT-IR, TEM, XPS et XRD. Les CD de thé se sont avérés éliminer in vitro le radical anion hydroxyle et superoxyde. De plus, les CD de thé présentaient une fluorescence bleue brillante sous lumière UV (lambdaex = 365 nm) et la fluorescence pouvait être efficacement atténuée par les ions CrO4 (2-) et Fe (3+). Pendant ce temps, la fluorescence des systèmes Tea-CD-CrO4 (2-) et Tea-CD-Fe (3+) pourrait à nouveau être facilement récupérée par l'acide ascorbique (AA) et la L-cystéine (L-Cys). En tant que nano-capteur fluorescent on-off-on des Tea-CDs, les détections sensibles de CrO4 (2-), Fe (3+), AA et L-Cys ont toutes été effectuées, montrant que les bonnes relations linéaires entre la fluorescence l'intensité des CD de thé et la concentration de tous les échantillons de test. Enfin, les capteurs ont détecté avec succès le CrO4 (2-), le Fe (3+), l'AA et le L-Cys dans des échantillons réels disponibles dans le commerce avec des intervalles de récupération satisfaisants. Les capteurs préparés offrent des avantages distincts, notamment un faible coût, une manipulation simple, une bonne sensibilité et une sélectivité élevée.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30695741


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