摘要:
Die Erfindung betrifft ein Verfahren zur biokatalytischen Herstellung von Ambroxan mittels eines Polypeptids mit der Aktivität einer Homofarnesol-Ambroxan-Cyclase, die eine neue Klasse von Enzymen darstellen.
摘要:
The present invention provides methods for producing a product of one or more enzymatic pathways. The pathways used in the methods of the invention involve one or more conversion steps such as, for example, an enzymatic conversion of guluronic acid into D-glucarate (Step 7); an enzymatic conversion of 5-ketogluconate (5-KGA) into L-Iduronic acid (Step 15); an enzymatic conversion of L-Iduronic acid into Idaric acid Step 7b); and an enzymatic conversion of 5-ketocluconate into 4,6-dihydroxy 2,5-diketo hexanoate (2,5-DDH) (Step 16). In some embodiments the methods of the invention produce 2,5-furandicarboxylic acid (FDCA) as a product. The methods include both enzymatic and chemical conversions as steps. Various pathways are also provided for converting glucose into 5-dehdyro-4-deoxy-glucarate (DDG), and for converting glucose into 2,5-furandicarboxylic acid (FDCA). The methods also involve the use of engineered enzymes that perform reactions with high specificity and efficiency. Additional products that can be produce include metabolic products such as, but not limited to, guluronic acid, L-iduronic acid, idaric acid, glucaric acid. Any of the products can be produced using glucose as a substrate or using any intermediate in any of the methods or pathways of the invention.
摘要:
The invention is directed to a process for the preparation of 2,5-furandicarboxylic acid (FDCA) by fermentation comprising fermenting a suitable starting compound to produce an aqueous solution of a salt of FDCA having a pH of at least 7, optionally removing solids from said solution, e.g. by filtration, subsequently freeze crystallizing the said salt of FDCA from said solution at said pH, isolating the said FDCA salt in the form of solid crystals, preparing an aqueous solution of said salt and crystallizing FDCA as the free acid from said solution at an acidic pH.
摘要:
The invention relates to a method for transforming levoglucosenone into 4-hydroxymethyl butyrolactone or 4-hydroxymethyl butenolide, comprising a step involving the oxidation of the levoglucosenone, or dihydrolevoglucosenone obtained by hydrogenation of levoglucosenone, by bringing a solution of levoglucosenone or dihydrolevoglucosenone in a solvent into contact with a lipase in the presence of an oxidizing agent and an acyl donor compound. The oxidation step is followed by a step involving the hydrolysis of the reaction mixture obtained, and, if necessary, a step involving the hydrogenation of the compound obtained at the end of the hydrolysis step.
摘要:
The present invention relates to the field of biotransformation of furanic compounds. More particular the present invention relates to novel genetically modified cells with improved characteristics for biocatalytic transformation of furanic compounds and a vector suitable for the genetic modification of a host cell. Further aspects of the invention are aimed at processes for biotransformation of 5-(hydroxymethyl)furan-2-carboxylic acid (HMF-acid) and its precursors with the use of the cell according to the invention.