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Enzymatic modification of chitosan with quercetin and its application as antioxidant edible films

E Torres1, V Marín, J Aburto

  • 1Center of Chemistry-ICUAP, University of Puebla, Edificio 103G. Puebla 72570 México. eduardo.torres@correo.buap.mx

Prikladnaia Biokhimiia I Mikrobiologiia
|May 17, 2012
PubMed

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Oxidation of Phenols to Quinones01:17

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...