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The role of supercritical fluids in the fractionation pretreatments of a wheat bran-based biorefinery

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Abstract Wheat bran is a very interesting feedstock for lignocellulosic biorefineries. The recovery of proteins, oil and phytochemicals can be integrated with the fractionation of polysaccharides and lignin, adding value… Click to show full abstract

Abstract Wheat bran is a very interesting feedstock for lignocellulosic biorefineries. The recovery of proteins, oil and phytochemicals can be integrated with the fractionation of polysaccharides and lignin, adding value to a multi-product biorefinery concept. After reviewing the work previously reported in the literature concerning the use of sc-CO2 and subcritical and supercritical water, the present manuscript proposes a sequential cascade process to obtain most of the valuable components of wheat bran. Six sequential steps are proposed: (1) De-fatting with sc-CO2 at 30 MPa and 70 °C, (2) Phenolic lipids recovery with sc-CO2 at 40 MPa and 80 °C, (3) De-starching assisted with ultrasounds, using water at 55 °C for 7 min, (4) Protein and lignin recovery with NaOH at 80 °C and pH = 9.3, (5) Recovery of xylose and arabinose with Hot Compressed Water assisted with RuCl3/MCM48 catalyst at 180 °C and (5) ultrafast hydrolysis of cellulose with supercritical water.

Keywords: recovery; fractionation; wheat; wheat bran; supercritical fluids

Journal Title: Journal of Supercritical Fluids
Year Published: 2017

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