摘要:
The invention relates to a method for the oxidation of a primary or secondary alcohol, preferably to form an aldehyde or ketone, comprising the following steps: a) providing a catalyst composition comprising at least one compound containing a nitroxyl radical, at least one NO source, at least one carbon or mineral acid or an anhydride of a carbon or mineral acid; b) producing a reaction mixture by adding at least one primary or secondary alcohol and a gas comprising oxygen and optionally one or more than one solvent to the catalyst composition from step a) or step e); c) incubating the reaction mixture from step b) at a temperature of between 0 and 100° C. or at the boiling point of the solvent; d) simultaneously with or subsequent to step c): crystallizing the reaction product; and e) recovering the catalyst composition by removing the crystallized reaction product from the reaction mixture obtained in step d).
摘要:
Methods and systems for coloring media are described. A first sequence of images at a first resolution is received, wherein the first sequence of images includes images with color information. A second sequence of images is received. Optionally, image registration is performed for a plurality of images in the first sequence with respect to the second sequence and/or for a plurality of images in the second sequence with respect to the first sequence. A color analysis is performed using (optionally aligned) images from the first sequence of images and the second sequence of images, and the results are used to color the second sequence of images.
摘要:
The subject of the invention is a biotechnological process for the production of ω-functionalized carboxylic acids and of ω-functionalized carboxylate esters from simple carbon sources.
摘要:
In this process for preparing a β-1,3-glucan, the glucan-containing matrix is treated with a protein having β(1,3)-glucanase activity, wherein the concentration of the glucanase amounts from 0.001 to 3.0% by weight. The glucan-containing matrix can be a fermentation broth, a culture medium or a suspension, where appropriate containing unsolved solids, cell constituents and/or cell fragments, or else a mycelium, a hydrocolloid or a powder preparation having a solvent proportion of from 20 to 99.9% by weight. The duration of the enzymatic treatment should be between 15 minutes and 24 hours and the treatment should be carried out continuously. The invention also envisages the glucan-containing matrix being filtered or centrifuged, after it has been treated enzymatically, and the glucan finally being separated off. A β-1,3-glucan which has been prepared in this way and which exhibits, for example, improved solubility in cold water, reduced proportions of insoluble constituents, an increased viscosity or improved filterability, is also claimed. A solid formulation and the use of these glucans for cosmetic applications, foodstuffs or oil production are also coclaimed.
摘要:
The invention concerns a water-containing medium with an increased viscosity containing a gellable polymer component with phenolic substituents modified with the aid of oxidases, characterized in that it was modified by a) a protein with polyphenol oxidase activity and/or b) an enzyme mixture containing hydrolases, oxidoreductases and peroxidases. The medium modified in this manner can be a gel that is preferably in a (partially) dried or (partially) rehydrated state, whose viscosity or gel strength can be selectively adjusted and which, even after a drying process and rehydration, again stably attains the original viscosity or gel strength. In addition the water-containing medium does not have any by-products that could have an adverse effect on quality of the gel or its sensory properties. In addition to the water-containing medium, a process is also proposed that can be used to produce the corresponding media with increased viscosity and which relies on the use of oxidoreductases, peroxidases, hydrolases and/or catalases. Food industry, cosmetics and pharmaceutical purposes are intended as areas of application for the proposed water-containing media.
摘要:
The invention relates to a method for the oxidation of a primary or secondary alcohol, preferably to form an aldehyde or ketone, comprising the following steps: a) providing a catalyst composition comprising at least one compound containing a nitroxyl radical, at least one NO source, at least one carbon or mineral acid or an anhydride of a carbon or mineral acid; b) producing a reaction mixture by adding at least one primary or secondary alcohol and a gas comprising oxygen and optionally one or more than one solvent to the catalyst composition from step a) or step e); c) incubating the reaction mixture from step b) at a temperature of between 0 and 100° C. or at the boiling point of the solvent; d) simultaneously with or subsequent to step c): crystallizing the reaction product; and e) recovering the catalyst composition by removing the crystallized reaction product from the reaction mixture obtained in step d).
摘要:
The invention relates to a method for the enzymatic production of emulsifiers containing mono- and diacylglycerides. In a first step a), a mixture of a phospholipid component and a triacylglyceride component is prepared, then in step b) a quantity of an aqueous solution containing a (phospho)lipase is added to the mixture obtained, to produce a water content of the mixture of between 3 and 15 wt. %. In a subsequent step c), the mixture obtained in the previous step is reacted at a temperature ranging between 20° and 80° C. over a period of at least two hours and said mixture is then dried.
摘要:
Methods and systems for coloring media are described. A first sequence of images at a first resolution is received, wherein the first sequence of images includes images with color information. A second sequence of images is received. Optionally, image registration is performed for a plurality of images in the first sequence with respect to the second sequence and/or for a plurality of images in the second sequence with respect to the first sequence. A color analysis is performed using (optionally aligned) images from the first sequence of images and the second sequence of images, and the results are used to color the second sequence of images.
摘要:
The invention relates to a method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dione (I), comprising the oxidation of dianhydrohexitols (II-IV), or of corresponding hydroxy ketones, with an oxygen-containing gas in the presence of a catalyst composition, the reaction proceeding without the addition of halogen sources.
摘要:
The invention relates to a method for producing 2,6-dioxabicyclo-(3.3.0)-octane-4,8-dione (I), comprising the oxidation of dianhydrohexitols (II-IV), or of corresponding hydroxy ketones, with an oxygen-containing gas in the presence of a catalyst composition, the reaction proceeding without the addition of halogen sources.