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00925njm 22002777a 4500 dc Rivas Siota, Sandra author Rigual Hernández, Victoria de los Ángeles author Domínguez Toribio, Juan Carlos author Alonso Rubio, María Virginia author Oliet Pala, María Mercedes author Parajó, Juan Carlos author Rodríguez Somolinos, Francisco author 2020-08-04 A combination of biorefinery processes (hydrothermal and membrane processing) was performed for the manufacture of oligosaccharides and natural phenolic compounds from poplar hemicelluloses. Both, oligosaccharides and phenolics have multiple potential applications related to their bioactive properties. Firstly, non-isothermal autohydrolysis of poplar was performed to obtain oligosaccharides from the hemicellulosic fraction, while cellulose and lignin remained almost unaltered in the spent solid allowing their valorization in further processing stages. Operating at 210 o C and liquid to solid ratio of 6 kg/kg, solutions containing 28.71 g oligosaccharides/L were obtained. Secondly, membrane refining of the resulting solution and further freeze-drying resulted in a product with high purity (90 kg of substituted oligosaccharides/100 kg of non-volatile compounds). The yield of substituted oligosaccharides in the target product accounted 16.6 kg/100 kg of poplar wood. Product characterization was accomplished by HPLC, HPSEC, HPAEC-PAD and MALDI TOF-MS. The data confirmed the presence of backbones containing up to DP13 pentose units, with a complex substitution pattern by acetyl groups and O-methyl-uronic moieties. Additionally, the presence of natural phenolic compounds bounded to oligosaccharides conferred antioxidant properties to the target product. Substituted oligosaccharides and phenolics are postulated as valuable products with interest in food and pharmaceutical industries. Rivas, Sandra, et al. «A Biorefinery Strategy for the Manufacture and Characterization of Oligosaccharides and Antioxidants from Poplar Hemicelluloses». Food and Bioproducts Processing, vol. 123, septiembre de 2020, pp. 398-408. DOI.org (Crossref), https://doi.org/10.1016/j.fbp.2020.07.018. 10.1016/j.fbp.2020.07.018 https://hdl.handle.net/20.500.14352/137758 1744-3571 https://www.sciencedirect.com/science/article/pii/S0960308520304806 A biorefinery strategy for the manufacture and characterization of oligosaccharides and antioxidants from poplar hemicelluloses