Improved LC-MSn characterization of hydroxycinnamic acid derivatives and flavonols in different commercial mate (Ilex paraguariensis) brands. Quantification of polyphenols, methylxanthines, and antioxidant activity
2018
Mateos, Raquel | Baeza, Gema | Sarriá, Beatriz | Bravo, Laura | Ministerio de Economía y Competitividad (España) | Ministerio de Ciencia e Innovación (España) | European Commission | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
Yerba mate is a beverage rich in bioactive compounds popular in South America. Polyphenols and methylxanthines were qualitatively and quantitatively analyzed in four commercial brands of yerba mate, as well as the antioxidant capacity of the beverages. Using LC/MS analysis, 58 polyphenols were observed of which 4-sinapoylquinic acid, di- and tri-methoxycinnamoylquinic acids, two isomers of trimethoxycinnamoylshikimic acid and four isomers of caffeoyl-2,7-anhydro-3-deoxy-2-octulopyranosonic acid were identified for the first time in mate. Additionally, 46 polyphenols and 2 methylxanthines were quantified by HPLC-DAD. Hydroxycinnamic acid derivatives and flavonols comprised 90% and 10% of mate phenols, respectively, 3-caffeoylquinic (26.8–28.8%), 5-caffeoylquinic (21.1–22.4%), 4-caffeoylquinic (12.6–14.2%) and 3,5-dicaffeoylquinic acids (9.5–11.3%) along with rutin (7.1–7.8%) were the most abundant polyphenols, whereas caffeine was the main methylxanthine (90%). Ilex paraguariensis is an important source of polyphenols with moderate methylxanthines content; therefore its high antioxidant capacity was mainly associated to its polyphenolic composition.
Show more [+] Less [-]This work was funded by the Spanish Ministry of Economy and Competitivity (MINECO-FEDER), projects AGL2010-18269 and AGL2015-69986-R. G.B. is a FPI fellow (BES-2011-047476) funded by the Spanish Ministry of Science and Innovation and performed most experiments.
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