title: Antioxidant activity, ascorbic acid, phenolic compounds and sugars of wild and commercial Tuberaria lignosa samples: effects of drying and oral preparation methods.
abstract: The antioxidant activity and phytochemical composition (ascorbic acid, free sugars and phenolic compounds) of decoctions and infusions of wild and commercial samples of Tuberaria lignosa (Sweet) Samp. Aerial parts were evaluated and compared. Among wild samples, the effects of the drying method (freeze or shade-drying) on those parameters were studied. Infusion of the freeze-dried wild sample gave the highest levels of sugars, while infusion of shade-dried wild sample and decoction of the freeze-dried sample presented higher ascorbic acid and phenolic compounds content (including ellagitannins and flavonoids) than the other samples. The last two samples also revealed higher antioxidant activity, in some cases even higher than Trolox. Decoctions gave lower amounts of disaccharides than infusions, which seemed to be hydrolysed, increasing the content of monosaccharides. Commercial samples showed the lowest content in phenolic compounds, mainly in ellagitannins and flavonoids, and also the lowest antioxidant activity. This work gives scientific evidence to the traditional medicinal uses of wild Tuberaria lignosa, highlighting the interest of its decoctions and infusions as a source of bioactive compounds and functional beverages.
authors.affiliation: CIMO/Escola Superior Agrária, Instituto Politécnico de Bragança, Campus de Santa Apolónia, Apartado 1172, 5301-855 Bragança, Portugal.
authors.forename: José
authors.initials: J
authors.lastname: Pinela
authors.forename: Lillian
authors.initials: L
authors.lastname: Barros
authors.forename: Montserrat
authors.initials: M
authors.lastname: Dueñas
authors.forename: Ana Maria
authors.initials: AM
authors.lastname: Carvalho
authors.forename: Celestino
authors.initials: C
authors.lastname: Santos-Buelga
authors.forename: Isabel C F R
authors.initials: IC
authors.lastname: Ferreira
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000191:economics / Q000302:isolation & purification; D001205:Ascorbic Acid / Q000737:chemistry* / Q000191:economics / Q000302:isolation & purification; D002241:Carbohydrates / Q000737:chemistry* / Q000191:economics / Q000302:isolation & purification; D002626:Chemistry, Pharmaceutical / Q000191:economics / Q000379:methods*; D030601:Cistaceae / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry* / Q000191:economics / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry* / Q000191:economics / Q000302:isolation & purification
chemical_list: D000975:Antioxidants; D002241:Carbohydrates; D010636:Phenols; D010936:Plant Extracts; D001205:Ascorbic Acid