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Filename: drivers/Session_files_driver.php
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Filename: drivers/Session_files_driver.php
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Filename: Session/Session.php
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Filename: Session/Session.php
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Line: 7
Function: __construct
File: /home/orthodiedw/nutridatabase/index.php
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L’activité antioxydante de la vitamine C native (acide ascorbique, AH (2)) est entravée par l’instabilité de la solution. Le chargement sélectif de AH (2) dans la lumière interne de nanotubes d'halloysite naturels (HNT) donne un nano-antioxydant composite (HNT / AH (2)), qui a été caractérisé et étudié pour sa réactivité avec le persistant du 1,1-diphényl-2. picrylhydrazyle (DPPH *) et avec des radicaux peroxyle transitoires dans l'autoxydation inhibée de substrats organiques, à la fois en solution organique (acétonitrile) et dans de l'eau tamponnée (pH 7,4) par rapport à l'AH natif (2). HNT / AH (2) a montré une excellente performance antioxydante, plus efficace que l'acide ascorbique natif de 131% dans l'acétonitrile et de 290% (trois fois) en solution aqueuse, dans des conditions identiques. La réaction avec les radicaux peroxyle a une constante de vitesse de 1,4 x 10 (6) M (-1) s (-1) et de 5,1 x 10 (4) M (-1) s (-1), respectivement, dans de l’eau tamponnée (pH 7.4) et l’acétonitrile, à 30 ° C. Les résultats permettent de comprendre physiquement les facteurs régissant la réactivité HNT / AH (2). L'amélioration des performances de HNT / AH (2) est sans précédent parmi les formes d'acide ascorbique stabilisé et sa pertinence est discutée pour des raisons cinétiques.
Source: https://www.ncbi.nlm.nih.gov/pubmed/30691231