Barbosa Pereira, LetriciaPocheville, AinaraAngulo, InmaculadaPaseiro Losada, PerfectoCruz Freire, José Manuel2020-04-162020-04-162013Barbosa-Pereira, Letricia, Pocheville, Ainara, Angulo, Inmaculada, Paseiro-Losada, Perfecto, Cruz, José M. (2013). Fractionation and Purification of Bioactive Compounds Obtained from a Brewery Waste Stream. "Biomed research international", vol. 20132314-6133http://hdl.handle.net/10347/21480The brewery industry generates waste that could be used to yield a natural extract containing bioactive phenolic compounds. We compared two methods of purifying the crude extract—solid-phase extraction (SPE) and supercritical fluid extraction (SFE)—with the aim of improving the quality of the final extract for potential use as safe food additive, functional food ingredient, or nutraceutical. The predominant fractions yielded by SPE were the most active, and the fraction eluted with 30% (v/v) of methanol displayed the highest antioxidant activity (0.20 g L−1), similar to that of BHA. The most active fraction yielded by SFE (EC50 of 0.23 g L−1) was obtained under the following conditions: temperature 40∘ C, pressure 140 bar, extraction time 30 minutes, ethanol (6%) as a modifier, and modifier flow 0.2 mL min−1. Finally, we found that SFE is the most suitable procedure for purifying the crude extracts and improves the organoleptic characteristics of the product: the final extract was odourless, did not contain solvent residues, and was not strongly coloured. Therefore, natural extracts obtained from the residual stream and purified by SFE can be used as natural antioxidants with potential applications in the food, cosmetic, and pharmaceutical industriesengCopyright © 2013 Letricia Barbosa-Pereira et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly citedhttps://creativecommons.org/licenses/by/3.0/StreamWasteBioactive phenolic compoundsjournal article10.1155/2013/4084912314-6141open access