摘要:
Methods are disclosed for the production of high concentrations of ethanol from biomass using Zymomonas as the ethanologen. Zymomonas is grown under conditions of low impeller agitation with high concentration of insoluble solids in a saccharification-fermentation mixture during a simultaneous saccharification and fermentation reaction for the production of high concentrations of ethanol.
摘要:
The invention relates, in general, to methods of processing lignocellulosic biomass to fermentable sugars and to methods that rely on hydrothermal pretreatment. Xylose monomer yields comparable to those achieved using two-stage pretreatments can be achieved from soft lignocellulosic biomass feedstocks by pretreating to very low severity in a single-stage pressurized hydrothermal pretreatment, followed by enzymatic hydrolysis to release xylose retained in the solid state. In some embodiments, pretreated biomass is separated into a solid fraction and a liquid fraction, the solid fraction subject to enzymatic hydrolysis, and the separated liquid fraction subsequently mixed with the hydrolysed solid fraction.
摘要:
There is disclosed a method for processing a biomass (for example straw) containing lignocellulose such that cellulose and hemicellulose are made accessible for further processing, typically by decomposition, without needing energy-consuming dissolution of the biomass in water. The method includes repeated compressions of the biomass in a reciprocating piston press, where loose biomass is continuously fed into a piston chamber in front of a piston which moves the loose biomass into a tubular reaction chamber in which the biomass is compressed for producing a vapour explosion and autohydrolysis under simultaneous displacement of compressed biomass through the reaction chamber. After compression, the biomass can be added fluid livestock manure, fluid waster water sludge etc. in a biogas plant for a subsequent biogas process.
摘要:
The present invention relates to processes for producing ethanol from lignocellulosic hydrolysates comprising hexoses, pentoses and acetic acid, whereby genetically modified yeast cells are use that comprise an exogenous gene encoding an acetaldehyde dehydrogenase and a bacterial gene encoding an enzyme with NAD+-linked glycerol dehydrogenase activity. The process is further characterised in that glycerol is present in or fed into the culture medium, whereby the modified yeast cell ferments the hexoses, pentoses, acetic acid and glycerol to ethanol. The invention further relates to yeast cells for use in such processes. The yeast cells advantageously comprise genetic modifications that improve glycerol utilization such as modifications that increase one or more of dihydroxyacetone kinase activity and transport of glycerol into the cell. The yeast cell further preferably comprises a functional exogenous xylose isomerase gene and/or functional exogenous genes which confer to the cell the ability to convert L-arabinose into D-xylulose 5-phosphate and they may comprise a genetic modification that increase acetyl-CoA synthetase activity.
摘要:
The present invention relates to polypeptides having trehalase activity. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using a trehalase of the invenion, in particular a process of producing a fermentation product, such as ethanol.
摘要:
Compositions comprising water-soluble C5 oligosaccharide hydrolysates are described, comprising C5 disaccharides, C5 trisaccharides, C5 tetrasaccharides, C5 pentasaccharides and C5 saccharides having a degree of polymerization of at least about 6.
摘要:
A method for production of an animal feed product comprises: a) partial hydrolysis of a fermentation feedstock or the non-ethanol by-product of a fermentation process performed on a fermentation feedstock, which partial hydrolysis converts non starch polysaccharides to soluble oligomers and monomers; b) fermentation of the soluble oligomers and monomers in the partially hydrolysed feedstock or non-ethanol by-product to produce ethanol; e) recovery of the non-ethanol by-product from the fermentation of step b) to produce an animal feed product more specifically an animal feed product with improved nutritional content. A method for production of an animal feed product comprises: a) partial hydrolosis of the non ethanol by-product of a fermentation process performed on a fermentation feedstock, which partial hydrolysis converts non starch polysaccharides to soluble oligomers and monomers; b) recovery of the partially hydrolysed product from step a), to exclude the soluble oligomers and monomers, to produce an animal feed product, more specifically an animal feed product with improved nutritional content. The methods produce an animal feed product with improved nutritional content by virtue of decreased levels of pentose sugars, increased relative protein concentration, decreased relative fibre concentration, decreased levels of soluble oligomers and monomers or decreased levels of reducing sugars.
摘要:
There is disclosed a method for processing a biomass (for example straw) containing lignocellulose such that cellulose and hemicellulose are made accessible for further processing, typically by decomposition, without needing energy-consuming dissolution of the biomass in water. The method includes repeated compressions of the biomass in a reciprocating piston press, where loose biomass is continuously fed into a piston chamber in front of a piston which moves the loose biomass into a tubular reaction chamber in which the biomass is compressed for producing a vapour explosion and autohydrolysis under simultaneous displacement of compressed biomass through the reaction chamber. After compression, the biomass can be added fluid livestock manure, fluid waster water sludge etc. in a biogas plant for a subsequent biogas process.
摘要:
A method of processing plant biomass comprising: obtaining a transgenic plant or part thereof including a first modified protein having a lignocellulosic degrading protein or a starch degrading protein and an intein fused within the lignocellulosic degrading protein or starch degrading protein, wherein the intein is inducible to cause cis splicing of the first modified protein; and inducing splicing of the modified protein in the presence of at least a portion of the transgenic plant or part thereof.