Acid hydrolysis of almond shells in a biphasic reaction system: Obtaining of purified hemicellulosic monosaccharides in a single step. (September 2021)

• Record Type: Journal Article
• Authors: Dávila, Izaskun; Diaz, Estelle; Labidi, Jalel
• Is Part Of: Bioresource technology. Volume 336(2021)
• Publication Date: 2021-09
• Subjects: Biphasic reaction system -- Valorization -- Almond shells -- Monosaccharides -- Biorefinery; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125311
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Lignin-PVA smart hydrogels were successfully synthesized. Medium and high molecular weight PVA enabled a good synthesis. Lignin-PVA hydrogels presented high swelling capacities and reusability. The smart hydrogels were pH and temperature responsive. Lignin enhanced the adsorption of methylene blue cationic dye. Abstract: The aim of this work is to comprehend the biphasic reaction systems through another perspective; the simultaneous purification and production of carbohydrates during the pretreatment of biomass. A dilute acid hydrolysis of almond shells in a 2-Methyltetrahydrofuran/H2 O system was optimised to maximise the obtaining of hemicellulose-derived monosaccharides with the minimum formation of degradation products. The optimised conditions of the biphasic reaction system, which produced 205.3 g hemicellulose-derived monosaccharides/Kg almond shells, were replicated in a monophasic reaction system to assess the benefits of the biphasic reaction systems. The latest system allowed the removal of 85.3% of the furans generated during the dilute acid hydrolysis, creating antioxidant extract, together with the catalysis of the hydrolysis of the hemicelluloses in a 20%. Therefore, the proposed process could become a promising method to purify carbohydrates with an environmentally friendly procedure that allowed the obtaining of multiple added-value products in a single step.