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PHENOLIC COMPOUNDS AND ANTIOXIDANT CAPACITY IN INFUSIONS OF OAK LEAVES
Non-timber forest products are of great economical, social and cultural importance besides being used for artisanry, food and medicinal purposes. In Mexico there is a wide variety of non-timber products from different species, including several Quercus species. From the medical point of view, bark is used to cure and harden gums or soothe dental ailments. Leaves are also used as antidiarrheals and astringents. The objective of this paper is to evaluate the phenolic content and the antioxidant capacity in infusions of oak leaves (Quercus candicans, Q. laurina and Q. rugosa). Samples were collected in the indigenous community of Nuevo San Juan Parangaricutiro, in the state of Michoacán, Mexico. Leaves were left to dry in the shade for three weeks, then ground and sieved. The identification of phenolic compounds was carried out using UPLC-QqQ. Whereas the following methodologies were used to determine the antioxidant capacity: ORAC, ABTS and ON. Results indicate that the polyphenol content directly affects the ORAC test, since similar patterns were obtained in the polyphenol content and in the antioxidant activity of the samples. A similar behavior was observed in the ABTS test related to flavonoid content. Q. candicans only stood out in the content of phenolic acids, while Q. rugosa and Q. laurina showed higher values of flavonoids. Regarding the antioxidant activity Q. laurina showed better results.