RT Journal Article
T1 Yerba mate waste: A sustainable resource of antioxidant compounds
A1 Gullón Estévez, Beatriz
A1 Eibes González, Gemma María
A1 Moreira Vilar, María Teresa
A1 Herrera, René
A1 Labidi, Jalel
A1 Gullón, Patricia
AB The infusion of yerba mate (Ilex paraguariensis St. Hil.) is the most popular tea-like beverage of southern Latin American countries, and its health benefits such as stimulating effect and antioxidant activity are well known. The exhausted mate leaves are managed as waste and are not currently exploited or valorized as a bio-resource. In this work, a cost-effective alternative for extracting antioxidant compounds from this type of residue as a possible valorization route was investigated. Accordingly, different liquid/solid ratios, solvents and extraction times were evaluated with the aim of maximizing extraction performance, total phenolic (TPC) and flavonoid (TFC) content and antioxidant activity (AA) of the extracts. The optimal conditions allowed the recovery of high level of phenolics (TPC 63.13 mg gallic acid equivalents/g) and flavonoids (TFC 148.45 mg rutin equivalents/g) in the extract, with remarkable content in AA (111.18 mg Trolox equivalents/g). Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) analysis identified that the main compounds in the extract were terpenes (phenol, guaiacol, 4-vinylguaicol and eugenol), caffeine, 4-ethyl-resorcinol, hydroquinone, palmitic acid, and stearic acid. Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA) analyses provided the functional characteristics and thermal stability of the extract. From the results obtained, it can be concluded that the residue of yerba mate after the infusion of the original yerba mate still possesses high antioxidant potential, mainly associated with its phenolic and flavonoid composition. Furthermore, the content of antioxidant phenolic compounds reported here was higher than most of those reported for agro-industrial residues. Therefore, this type of waste, that is generally discarded, can be valorized as a source of high added-value compounds.
PB Elsevier
YR 2018
FD 2018-03
LK https://hdl.handle.net/10347/39260
UL https://hdl.handle.net/10347/39260
LA eng
NO Beatriz Gullón, Gemma Eibes, María Teresa Moreira, René Herrera, Jalel Labidi, Patricia Gullón, Yerba mate waste: A sustainable resource of antioxidant compounds, Industrial Crops and Products, Volume 113, 2018, Pages 398-405, ISSN 0926-6690, https://doi.org/10.1016/j.indcrop.2018.01.064.
NO This work was funded by the Spanish Ministry of Economy and Competitiveness (CTQ2014-58879-JIN and CTQ2016-81848-REDT). The authors (B. Gullón, G. Eibes and M.T. Moreira) belong to the Galician Competitive Research GroupGRC2013-032 and to the CRETUS Strategic Partnership (AGRUP2015/02). All these programs are co-funded by FEDER (EU). The authors (R. Herrera, J. Labidi and P. Gullón) belong to the Basque Competitive Research Group IT1008-16 funded by the Department of Education of the Basque Government. B. Gullón and P. Gullón would like to express her gratitude to the Spanish Ministry of Economy and Competitiveness for financial support (Grant references IJCI-2015-25305 and IJCI-2015-25304, respectively).
DS Minerva
RD 24 abr 2026