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Valorization of Wheat Bran: Ferulic Acid Recovery Using Pressurized Aqueous Ethanol Solutions

  • Victoria Pazo-Cepeda
  • Óscar Benito-Román
  • Alexander Navarrete
  • Esther AlonsoEmail author
Original Paper
  • 8 Downloads

Abstract

The extraction of ferulic acid (FA) and other phenolic compounds from wheat bran can represent an interesting valorization step of this lignocellulosic biomass. In this work, pressurized hot water (PHW) and pressurized aqueous ethanol are used as solvents, and the amount of extracted FA in its free form and the total phenolic content of the extract have been evaluated. Total ferulic acid in the initial wheat bran was 2570.9 ± 1.8 µg/g of dry bran, being more than 98.5% esterified to arabinoxylans and other cell wall structures (insoluble-bound FA). Different concentrations of ethanol in water (0–20–50–80%), temperatures (130–145–160 °C) and extraction times (20–40–60 min) were tested. It was observed that low ethanol concentrations in the solvent, high temperatures and long extraction times favored the extraction, being the hydrolysis and not the solvolysis the reaction mechanism involved in the release of bound FA. Maximum FA extraction yield was found for pure water (PHW), 160 °C and 74 min of extraction that corresponds to a thermal severity factor of log (R0) ≈ 3.7. The so obtained FA extraction yields are higher than those obtained with an enzymatic hydrolysis treatment performed for comparison.

Graphic Abstract

Keywords

Wheat bran Ferulic acid Pressurized liquid extraction Phenolic compounds Bound phenolics TPC 

Notes

Acknowledgements

Authors gratefully acknowledge the financial support of Spanish Government through the Research Project CTQ2015-64892-R (MINECO/FEDER) and Junta de Castilla y León through the project VA040U16. M.V. Pazo-Cepeda thanks Universidad de Valladolid for her predoctoral contract.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.High Pressure Processes Group, Department of Chemical Engineering and Environmental TechnologyUniversity of ValladolidValladolidSpain
  2. 2.BioEcoUVa. Research Institute on BioeconomyUniversity of ValladolidValladolidSpain

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