RT info:eu-repo/semantics/article
T1 Water Ultrasound-Assisted Extraction of Polyphenol Compounds from Brewer’s Spent Grain: Kinetic Study, Extract Characterization, and Concentration
A1 Alonso Riaño, Patricia
A1 Sanz Díez, Mª Teresa
A1 Blanco Alcalde, Beatriz
A1 Beltrán Calvo, Sagrario
A1 Trigueros Andrés, Ester
A1 Benito Román, Oscar
K1 brewer’s spent grains
K1 ultrasound assisted extraction
K1 polyphenol compound
K1 extractives concentration
K1 Ingeniería química
K1 Chemical engineering
AB Brewer’s spent grain (BSG) was chemically characterized obtaining 52.1% of carbohydrates, 17.8% protein, 5.9% lipids, 13.5% insoluble lignin and 24.3% of water-soluble extractives. This work has been focused on the study of polyphenol extraction of the extractive fraction by water ultrasound-assisted extraction. Selected extraction conditions were 47 °C and 21.7 mL water/gdry-BSG. The effect of solvent polarity on polyphenol extraction was studied by using ethanol aqueous mixtures, from 20% to 100% ethanol. The kinetics of polyphenol extraction have been fitted to the power law and the Weibull models yielding mean values of the root mean square deviation lower than 7.5%. Extracts have been characterized in terms of quantification of individual phenolic compounds by HPLC-DAD and protein and sugar soluble fractions (glucose, xylose, and arabinose). Polyphenol profile has been compared with other hydrolytic techniques, such as acid, basic and enzymatic hydrolysis, showing that ultrasound was not as effective as basic hydrolysis to release the phenolic acids esterified to the cell wall. A further centrifuge ultrafiltration concentration step was able to yield a retentate enriched in the protein fraction while individual phenolic compounds where mainly transferred to the permeate.
PB MDPI
YR 2020
FD 2020-03
LK http://hdl.handle.net/10259/5255
UL http://hdl.handle.net/10259/5255
LA eng
NO Junta de Castilla y León (JCyL) and ERDF for financial support of project BU301P18, and O. Benito-Román post-doctoral contract. To JCyL and ESF for the predoctoral contracts of E. Trigueros and P. Alonso-Riaño and for the contracts of D. Benito-Bedoya and D. M. Aymara-Caiza through the YEI program.
DS Repositorio Institucional de la Universidad de Burgos
RD 19-abr-2024