Abstract:
A process for the production of hemicellulose-derived monosaccharides comprising: (a) contacting an aqueous hemicellulosic stream with a C 3-8 alkyl alcohol at elevated temperature and acidic pH to produce a reaction mixture comprising a C 3-8 alkyl ester and a hemicellulose-derived monosaccharide; and (b) separating the reaction mixture obtained from step (a) into an aqueous phase comprising said hemicellulose-derived monosaccharide and an organic phase comprising said C 3-8 alkyl ester. The product of step (b) may be further processed using an optional step: (c) reacting said hemicellulose-derived monosaccharide obtained from step (b) with a metal hydroxide or a quaternary ammonium hydroxide to produce a metal lactate or quaternary ammonium lactate.
Abstract:
The present disclosure relates generally to polysaccharide synthases. The present disclosure reveals that a subset of the CesA gene family encode XynS xylan synthases. As a result of the identification of XynS nucleic acids, and corresponding amino acid sequences that encode XynS xylan synthases, the present invention provides, inter alia, methods and compositions for modulating the level and/or activity of xylan synthase in a cell and/or modulating the level of xylan produced by a cell.
Abstract:
The invention relates to a method for isolating xylan from plant material. In the method, cellulose fibres which contain xylan are used, advantageously cellulose fibres from hardwood; and xylan is extracted (20) from said cellulose fibres by means of sodium hydroxide for forming an extract solution (17) that contains xylan; cellulose fibres are removed from said mixture that contains cellulose fibres and extract solution (17), for isolating said extract solution from said mixture; carbon dioxide (14) is added to said extract solution (17) for isolating xylan, wherein liquid brightener (18) and precipitated xylan (12) are formed; calcium hydroxide (16) is added to said isolated brightener (18), for forming precipitated calcium carbonate and liquid sodium hydroxide (15); and sodium hydroxide is removed from said mixture that contains sodium hydroxide and precipitated calcium carbonate, for isolating calcium carbonate from said mixture. Furthermore, the invention relates to a system for isolating xylan from plant material, and to xylan, calcium carbonate, cellulose fibre and use of xylan.
Abstract:
The present invention relates to an improved process for the preparation of Pentosan polysulfate of formula (I) or salt thereof, wherein R represents -SO 3 Y, and Y is at least one member selected from the group consisting of H and a pharmaceutically acceptable cation such as sodium, potassium, and magnesium which provides in particular to a narrow distribution low molecular weight, highly sulfated Pentosan polysulfate (in this instance a Xylan).
Abstract:
A fractionation process for producing value-added products from a lignocellulosic biomass, comprises: a) mechanically refining the lignocellulosic biomass under mild refining conditions to form a refined biomass pulp with enhanced susceptibility to separation of hemicellulose, cellulose and lignin, and enhanced digestibility of carbohydrates in hydrolysis b) separating hemicellulose and sulfur- free high-quality lignin from cellulose in the refined biomass, and, optionally c) producing various bioproducts from the above said process.
Abstract:
Komplex enthaltend (a) ein polymeres Guanidin und Gelatine oder (b) ein polymeres Guanidin und ein Polysaccharid. Das polymere Guanidin ist bevorzugt ein Kondensationsprodukt, welches durch Umsetzen von Guanidin oder einem Salz davon mit einem Alkylendiamin und/oder einem Oxyalkylendiamin erhältlich ist.
Abstract:
The present invention relates to a method for reductive amination of a water soluble carbohydrate. An aminated water soluble carbohydrate is a prerequisite in processes for further modification of cellulose. The synthesis of this molecule comprises, providing a water soluble carbohydrate, an amine and a reducing agent, which are reacted under acidic conditions, isolated to give an aminated water soluble carbohydrate with a yield larger than 60%. The invention also relates to an aminated hemicellulose molecule with a molecular weight of at least 1 kDa, especially xyloglucan.
Abstract:
Concentrated sugar solutions obtained from polysaccharide enriched biomass by contacting biomass with water and at least one nucleophilic base to produce a polysaccharide enriched biomass comprising a solid fraction and a liquid fraction and then contacting enriched biomass with a dilute mineral acid selected from the group consisting of sulfuric acid, phosphoric acid, hydrochloric acid, nitric acid, or a combination thereof, to produce an intermediate saccharification product, which is contacted with an enzyme consortium to produce a final saccharification product comprising fermentable sugars.