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Filename: drivers/Session_files_driver.php
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L'un des aspects les plus importants de la détection des composés antioxydants est la mise au point d'une méthode de dépistage rapide. Le criblage de la capacité antioxydante relative globale de plusieurs extraits de plantes hydrosolubles roumaines est au centre de ce travail. Ceci est important en raison de la présence croissante d'espèces réactives de l'oxygène (telles que H (2) O (2)) qui génère un stress oxydatif dans le corps humain. Les conséquences sont un grand nombre de conditions médicales qui peuvent être aidées par une consommation accrue d'extraits de plantes en tant que compléments alimentaires, qui ne contiennent pas nécessairement les teneurs en antioxydants spécifiées. En exploitant les propriétés catalytiques des nanoparticules d’or, un capteur électrochimique spécifique, spécifique et sensible, dépourvu d’étiquette et basé sur des nanoparticules, a été optimisé. Les paramètres de travail ont été optimisés pour le criblage RAC d’extraits de plantes hydrosolubles. Premièrement, des mesures électrochimiques (voltamétrie et ampérométrie cycliques) ont été utilisées pour caractériser différents capteurs à base de nanoparticules, révélant ainsi les meilleures performances des capteurs à base de nanoparticules d'or, obtenant un coefficient de compensation de 98% pour les extraits de lavande. Le principe de détection repose sur l'effet d'extinction des antioxydants pour la détection ampérométrique de H (2) O (2), la diminution du signal électrique suggérant une augmentation de la capacité antioxydante. Les résultats obtenus ont été exprimés en équivalents acide ascorbique et Trolox afin de pouvoir corréler nos résultats avec des méthodes classiques comme la chimiluminescence et la spectrophotométrie UV-Vis, dans lesquelles un coefficient de corrélation de 0,907 a été atteint, suggérant une bonne corrélation entre électrochimie et spectrophotométrie. . Compte tenu de ces résultats, le capteur sans étiquette optimisé à base de nanoparticules d'or peut être utilisé comme une alternative simple et rapide aux méthodes classiques de détection de la capacité antioxydante relative d'extraits de plantes hydrosolubles.
Source: https://www.ncbi.nlm.nih.gov/pubmed/30704125