547results about "Monosaccharides" patented technology

The invention discloses preparation of a monatomic graphene type photo-thermal catalyst and application of the monatomic graphene type photo-thermal catalyst in catalyzing aldose to produce ketose, and the preparation comprises the following steps: loading a monatomic precursor (X) on a graphene type carbon material (GT) by adopting a solution impregnation method, further reducing the monatomic precursor into a corresponding monatomic (Y) by adopting a continuous oxidation-reduction method, the monatomic graphene type photo-thermal catalyst is obtained, and the monatomic graphene type photo-thermal catalyst is expressed as Ysg / GT. The catalyst is used for catalyzing other different aldoses (maltose, glyceraldehyde, erythritol and xylose) to produce corresponding ketose, the catalyst shows good catalytic activity and photo-thermal performance, and the ketose yield is larger than 50%. Finally, in the reusability research of the catalyst, the catalyst is found to have good activity and structural stability, the chemical equilibrium limit of the reversible reaction is broken through, the reaction rate is increased, and the catalyst can help to develop an efficient and green catalyst to open up a new way for the reversible reaction process.

The utility model belongs to the technical field of sugar alcohol preparation, and relates to a system for co-producing L-arabinose and caramel pigment by using xylose chromatography raffinate, which comprises a raw material tank, a nanofiltration membrane separator, a chromatography separation device, an evaporation concentration tank, a crystallization tank, a centrifugal separator and a dryer which are sequentially communicated by pipelines, and the browning reaction assembly is used for mixing the raffinate and the centrifugal mother liquor and then carrying out browning reaction treatment to prepare caramel pigment. The chromatographic separation device is used for separating an extracting solution and raffinate from the flowing nanofiltration permeate, the evaporation concentration tank and the crystallizing tank are used for concentrating and crystallizing the flowing extracting solution into massecuite, the centrifugal separator is used for separating the flowing massecuite into moist sugar and centrifugal mother liquor, and the dryer is used for drying the flowing moist sugar into L-arabinose crystals. According to the utility model, raffinate and centrifugal mother liquor are mixed to prepare a caramel pigment liquid product, so that a caramel pigment additional product is obtained while the utilization rate of saccharide resources is improved.

The invention discloses a carbon-based catalyst and a preparation method and application thereof to isomerization of glucose into fructose, the catalyst comprises an active component loaded on a carbon-based catalyst carrier and a chelating agent complexed with the active component, metal salts in the active component are Mg and K, the chelating agent is one or more of citric acid, triacetic acid, triethylamine ethylenediamine and potassium sodium tartrate. The chelating agent adjusts alkali active sites of a reaction system through acidic functional groups of the chelating agent, maintains an acid-base environment required by the reaction, and promotes an isomerization reaction from glucose to fructose. Meanwhile, the chelating agent and the metal ions form a stable complex to prevent metal salt from inactivation, and the metal ions are ensured to be uniformly distributed on the surface of the carrier and prevented from being agglomerated through the dispersity of the chelating agent, so that the activity and stability of the catalyst are improved. By controlling the dosage of the chelating agent and coordination of metal ions, the selectivity of the glucose isomerization reaction and the fructose yield are effectively improved, side reactions are inhibited, and the overall efficiency of the reaction is remarkably improved.

The present invention belongs to the technical field of food additives. A method for preparing glucosyl stevioside using a mother liquor sugar, separating and purifying the glucosyl stevioside and recovering glucose. Provided is a method for preparing glucosyl stevioside using a mother liquor sugar. By taking a mother liquor sugar as a raw material to prepare glucosyl stevioside, the route of utilization of mother liquor sugars is enriched, the technical gap of preparing glucosyl stevioside using a mother liquor sugar as a raw material is filled, and the prepared product has the advantages of good mouthfeel and high total glycoside content. Provided is a method for purifying glucosyl stevioside, wherein dextrin is recycled, which reduces the discharge of waste liquid, greatly reduces the energy consumption and cost of production, and improves the yield of glucosyl stevioside with high purity. Further provided is a method for separating and purifying glucosyl stevioside and recovering glucose, which method is simple in terms of process and easy to operate, and can not only obtain glucosyl stevioside with high purity, but also recycle unreacted substrates so as to reduce the cost.

The invention belongs to the technical field of biology, and particularly relates to recombinant bacillus subtilis, a preparation method of fermentation liquor, immobilized cells, a preparation method of the immobilized cells, a method for synthesizing D-tagatose and application of the D-tagatose. The invention provides a strain of recombinant bacillus subtilis BLCY-012, and the preservation number of the recombinant bacillus subtilis BLCY-012 is CGMCC (China General Microbiological Culture Collection Center) No.31950. The recombinant bacillus subtilis BLCY-012 disclosed by the invention can be fermented to generate the D-tagatose-4-epimerase, the D-tagatose-4-epimerase is an intracellular enzyme, the D-tagatose-4-epimerase can be used for preparing the D-tagatose by taking the D-fructose as a raw material, the immobilized cell is prepared by utilizing the recombinant bacillus subtilis BLCY-012, and the recombinant bacillus subtilis BLCY-012 can be used for preparing the D-tagatose. The immobilized cell is used as an enzyme carrier to convert D-fructose into D-tagatose, the conversion rate can reach 28%-32%, and the conversion rate is high.

The invention provides a method for separating and purifying galactose and glucose by using a simulated moving bed chromatography system, and relates to the technical field of saccharide separation and purification. According to the method, the simulated moving bed chromatography system is used for separating and purifying the galactose, operation can be carried out under the set temperature condition, the separation and purification efficiency of the galactose is remarkably improved, continuous large-scale efficient separation and purification of the galactose can be achieved, the separation and purification effect is good, the yield is high, and the product quality is good. According to the method, pure water is used as an eluent, and analyzed and purified compounds are free of damage, low in toxicity, rich in source and low in cost.

The invention is suitable for the technical field of chemical synthesis, and provides composite material lignin-based hydrothermal carbon as well as a preparation method and application thereof. According to the invention, lignin is taken as a raw material, so that resource reutilization of biomass is realized; the high-activity lignin-based hydrothermal carbon material is prepared by a hydrothermal method, and the high-activity composite material lignin-based hydrothermal carbon material is prepared by combining a mechanical ball milling method, so that the synthesis route is more convenient, green and safe; surface functional groups of lignin can be increased through a hydrothermal process, and meanwhile, metal and boron ions are introduced into the catalyst through a mechanical ball milling process, so that the material can efficiently isomerize glucose into fructose, the reaction time is short, and the selectivity is high. The metal aluminum modified lignin-based biochar catalyst prepared by using the preparation method provided by the invention can realize the glucose conversion rate of 67.4% and the fructose yield of 54.8%.

Disclosed in the present invention is a process for preparing a monosaccharide solution by means of acid gradient treatment of a straw lignocellulose. The process comprises the steps of: S1: performing a first acidolysis reaction on a lignocellulose biomass using an acid solution with a concentration of 50 wt% or above to obtain a first acidolysis solution; S2: uniformly mixing the first acidolysis solution with an organic solvent, and performing solid-liquid separation to obtain a glycan-containing residue; and S3: adding water and / or an acid solution to the glycan-containing residue to obtain a mixed solution with an acid concentration of 45 wt% or below, and performing a second acidolysis reaction to obtain a monosaccharide-containing reaction solution. In the present invention, pretreatment is performed at room temperature and atmospheric pressure without the need to provide additional energy, and various agents used in the pretreatment process are all recoverable, which greatly reduces the production cost. In addition, in the present invention, a relatively low liquid-solid ratio is used, monosaccharide can be directly obtained after the pretreatment, and finally a monosaccharide solution with a high and adjustable concentration is obtained, thereby avoiding a large amount of input in enzyme costs.

To provide a binding syrup composition for formulating food products containing allulose and low sugar syrups.SOLUTION: The binding syrup composition overcomes limitations of allulose-containing products including product stickiness and failure to maintain shape and texture of the products. More specifically, the binding syrup compositions described herein contain low sugar syrups with low mono- and di-saccharide content in combination with allulose to impart binding and textural attributes to the allulose-containing food products that are comparable to full sugar products. Food products containing the allulose binding syrup compositions described herein and methods of producing the same are also provided. Beneficially, food products having reduced caloric and sugar content are provided when employing the allulose-containing binding syrup compositions described herein.SELECTED DRAWING: Figure 1

Provided herein are compositions and methods relating to improved production of allulose by converting fructose to allulose using a allulose or psicose-3-epimerase from Brachyspira suanatina in the presence of base NaOH at 50 or 100mg / L.

The invention belongs to the technical field of textile waste recovery, and particularly relates to a method for degrading a waste cotton-polyester blended fabric through a chemical-enzyme cascade reaction and application of the method. The invention designs a chemical-enzyme hydrolysis cascade reaction for degrading polyester-cotton blended fabrics, which comprises the following steps: firstly, using recyclable organic acid p-toluenesulfonic acid (TsOH) as a catalyst, carrying out hydrothermal treatment on the polyester-cotton blended fabrics, and hydrolyzing cotton fibers in the blended fabrics into microcrystalline cellulose; and after melting and crushing the residual polyester fibers (terylene), degrading the residual polyester fibers (terylene) into monomers terephthalic acid and ethylene glycol by using PET hydrolase. The method has very high degradation efficiency on polyester cotton mixed textiles with different proportions, does not generate secondary pollution, and provides a green way for recycling textile wastes, so that the method has good practical application value.

The invention relates to the technical field of purification and concentration, in particular to a process for purifying and desalting psicose by an electrodialysis method. The electrodialysis method purification desalting process comprises the following steps: isomerizing a D-fructose solution to obtain a D-psicose solution; the D-psicose solution is decolored through activated carbon, and a decolored D-psicose solution is obtained; purifying and desalting the decolored D-psicose solution by adopting an electrodialysis method to obtain a purified and desalted D-psicose solution; enabling the purified and desalted D-psicose solution to pass through a chromatographic separation system to obtain a D-fructose mother solution and a D-psicose separation solution; the D-psicose separation solution is concentrated, cooled and crystallized, and the electrodialysis method purification desalting process is completed. The process for purifying and desalting the psicose by the electrodialysis method has the advantages of high efficiency, economy, stability and environment friendliness, and a new purification and desalting scheme is provided for production of the psicose.

The invention relates to the technical field of polysaccharide production, in particular to bacillus subtilis b1b-24-C and application of the bacillus subtilis b1b-24-C in fermentation co-production of D-psicose and isomaltooligosacharide. The bacillus subtilis b1b-24-C is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC NO.32594, the preservation date is November 13, 2024, and the address of the preservation institution is No.3, Yard 1, Beichen West Road, Chaoyang District, Beijing. The enzyme activity of the D-psicose 3-epimerase produced through fermentation of the bacillus subtilis is high, meanwhile, the stability, the conversion efficiency and the utilization efficiency of the enzyme can be effectively improved through immobilization of the enzyme, the production efficiency is improved, the production cost is remarkably reduced, and meanwhile, the method can also be used for co-producing an isomaltooligosacharide product.

The invention relates to the technical field of tagatose preparation, and particularly discloses a method for preparing tagatose and application. The method for preparing tagatose comprises the following steps: (1) mixing a galactose solution and an alkaline calcium isomerization agent, and carrying out an isomerization reaction; (2) carrying out acid neutralization reaction by adopting a mixed acid solution; acid in the mixed acid solution comprises phosphoric acid and citric acid; the mass ratio of the phosphoric acid to the citric acid is 1: (1-6); the pH value of the acid neutralization reaction is 2-5.0. According to the preparation method disclosed by the invention, the environmental pollution caused when phosphoric acid is singly used for production conventionally is reduced, the production safety is improved, and an ideal tagatose yield is obtained.

The invention provides a preparation method of glucose, and belongs to the technical field of glucose. The method comprises the steps of starch milk preparation, liquefaction, saccharification, filtration and post-treatment. The filtering step comprises the following steps: filtering the saccharified liquid through a 0.5 mm screen, collecting primary filtrate of the saccharified liquid, then adding an impurity removal agent, filtering, collecting secondary filtrate of the saccharified liquid, and carrying out nanofiltration treatment to obtain saccharified filtrate; the preparation method of the impurity removal agent comprises the following steps: placing activated carbon in a nitric acid solution, raising the temperature, stirring, filtering out, washing, putting into deionized water, adding a catalyst, stirring and catalyzing at room temperature for 28-32 minutes, then adding lauryl amine and glutamic acid, stirring and reacting at room temperature, filtering, washing, putting into a chitosan solution, stirring at 34-36 DEG C for 38-42 minutes, and filtering to obtain the impurity removal agent. Filtering, washing and drying to obtain an impurity removal agent; by adopting the preparation method disclosed by the invention, the yield and purity of the glucose are high, the stability of the functional saccharifying enzyme is good, and the energy consumption is low.

The invention provides a preparation process and application of sucrose syrup, and belongs to the technical field of food production and processing. According to the method, high-purity L-arabinose is used and matched with purified maltitol, the purity of the sucrose syrup raw material is improved, the influence of impurities is reduced, meanwhile, the modified nanofiltration membrane is selected to conduct impurity removal treatment on the syrup mixture, the ash content of the sucrose syrup is reduced through the comprehensive synergistic effect, and meanwhile the light transmittance of the syrup is improved.

The invention relates to a method for producing a fungal fermentation medium from brewer's grains (BSG) and to a correspondingly obtainable fermentation medium, to a method for producing a fungal biomass by submerged fermentation of at least one fungal strain and to a correspondingly obtainable fungal biomass, and to food products obtainable by using the instant fungal biomass of the invention.

A method for producing D-allulose syrup exhibiting high crystallinity is provided. [Solution] A D-allulose syrup containing, in addition to D-allulose, a D-allulose dimer mass content of less than 1.5% expressed in terms of dry mass, and characterized by the steps of providing a D-allulose composition containing D-allulose dimers, nanofiltering the D-allulose composition to provide a retentate and a permeate, recovering the nanofiltration permeate, and concentrating the permeate.

The utility model discloses D-ribose crystal separating and drying equipment which comprises a machine box, a rectangular frame is arranged between the left inner wall and the right inner wall of the machine box, a heating wire is arranged in the rectangular frame, a material frame is arranged on the bottom wall of the machine box, and the D-ribose crystal separating and drying equipment further comprises an air guiding mechanism and a material turning mechanism. The air guide mechanism comprises rotating shafts, a supporting plate and fans, the rotating shafts are rotationally connected to the upper sides of the left inner wall and the right inner wall of the case respectively, the supporting plate is fixedly connected between the inner side ends of the rotating shafts, and the fans which are bilaterally symmetrical are arranged in the supporting plate; the material overturning mechanism comprises a C-shaped plate, a rotating column, a support and a material scraping rod, and the C-shaped plate is slidably connected between the left end and the right end of the material frame. According to the D-ribose crystal separating and drying equipment, when D-ribose crystals are dried, air in a container is effectively circulated through swinging of a fan, meanwhile, the D-ribose crystals are overturned, and the drying efficiency of the D-ribose crystals is improved. And the D-ribose crystal is heated more uniformly, and the drying effect is better.

The invention belongs to the technical field of sugar synthesis chemistry, and particularly relates to a preparation method of L-mannose. According to the method, 1, 2, 3, 4, 6-penta-O-acetyl-beta-L-glucopyranose is used as a raw material, L-mannose is obtained by modifying and overturning L-glucose 2-OH, the raw material is easy to obtain, and the method is simple in process, low in cost, high in yield and suitable for large-scale production.

Non-dried allulose crystals are dried in a temperature treating step (b) in a drying apparatus at a temperature of about 25° C. to about 70° C., and in a conditioning step (c). The temperature treating step (b) may be carried out (b1) at atmospheric pressure and a residence time of about 5 minutes to about 5 hours. The temperature treating step (b) may be carried out (b2) under reduced pressure and constant temperature and a residence time from about 40 minutes to about 5 hours. The conditioning step (c) may be carried out (c1) over a period of about 30 minutes to 7 hours at a temperature from about 40° C. to about 70° C. The conditioning step (c) may be carried out (c2) over a period of about 15 minutes to about 90 hours at about 30 to about 60% relative humidity, and a temperature of about 25 to about 40° C.

The invention belongs to the technical field of biomass high-valued treatment, and particularly relates to a supported Mo resin catalyst and a preparation method thereof, and further relates to catalysis of glucose isomerization by the supported Mo resin catalyst at low temperature. Anion exchange resin and molybdate are used as raw materials, anion resin is used as a metal carrier, and the catalyst is obtained through an impregnation method. The Mo-loaded resin catalyst prepared by the invention is simple in preparation method, and the cost of the catalyst is remarkably reduced by taking anion exchange resin as a carrier. The Mo-loaded resin catalyst prepared by the invention realizes high-efficiency low-temperature thermal catalysis of glucose isomerization for synthesis of mannose, the yield of mannose reaches 29%, the selectivity of mannose reaches 95%, when xylose is used as a substrate, the yield of lyxose reaches 31.48%, the selectivity of lyxose reaches 94.01%, and the yield of lyxose reaches 31.48%. A new synthesis path is provided for efficient catalytic synthesis of high-value monosaccharide by taking glucose and xylose as raw materials.

The invention provides an energy-saving production process of xylose. The energy-saving production process comprises the following steps: crushing corncobs; a hydrolysis step; decolorizing with activated carbon; removing carbon; performing high-pressure membrane concentration; a step of adding calcium for neutralization; a step of over-carbon saturation reaction; ion exchange; performing secondary membrane concentration; carrying out secondary decolorization and interchange; moisture is removed through a triple-effect or higher-effect evaporator, and the sugar degree is increased to 65%; cooling and crystallizing the high-concentration liquid to generate high-purity xylose powder, and drying the xylose powder; warehousing finished products, sealing boxes of the obtained finished products, bagging and entering a warehouse; the energy-saving xylose production process has the advantages that the membrane concentration equipment is introduced into the production process before neutralization, so that the volume of all subsequent liquid is reduced, and the scale of subsequent treatment equipment and the consumption of water are reduced. A large amount of organic acid is removed in the concentration process, occupation of the organic acid on resin is reduced, and the exchange rate is increased; all substances except the organic acid are concentrated, and after the concentration is increased, a large amount of salt is removed through neutralization, so that the treatment content of a subsequent impurity removal procedure is reduced.

The present invention provides a compound or a pharmaceutically acceptable salt thereof, and a pharmaceutical composition thereof, wherein the compound comprises retinoic acid conjugated to a carbohydrate. In addition, the invention also provides application of the compound or the pharmaceutically acceptable salt thereof or the pharmaceutical composition in preparation of drugs for inhibiting virus infection or replication or treating cancers.

The invention relates to the technical field of galactose separation, in particular to a method for separating galactose from xylose mother liquor, which comprises the following steps: diluting the xylose mother liquor, and inoculating active dry yeast powder into the diluted xylose mother liquor for fermentation to obtain xylose fermentation liquor; filtering and concentrating the xylose fermentation liquor to obtain a raw material; and controlling the sample loading flow and the eluent flow in the two-dimensional liquid chromatography separation process of the raw materials, and separating the stock solution to obtain a galactose component solution. The invention aims to improve the purity of galactose in the separation process.

The invention discloses a method for preparing D-ribose by an adenosine hydrolysis method, belongs to the technical field of preparation of D-ribose, and aims to solve the problem that a method for preparing D-ribose by adenosine hydrolysis does not exist in the market at present. Comprising the following steps of water sample treatment, separation and purification, cation exchange column washing, extraction, crystallization, suction filtration and drying, D-ribose is prepared in an adenosine hydrolysis mode, reaction is few, impurities are few, purification is easy, the hydrolysis reaction yield is as high as 98%-100%, and the conventional fermentation yield is 50%-60%. The hydrolysis reaction provided by the invention has few side reactions, few by-products and easiness in purification, so that high-purity and high-yield D-ribose can be produced. And in addition, impurities are easier to remove when the D-ribose is purified, and the post-treatment difficulty is reduced.

One embodiment of the present invention provides a method for purifying a psicose-containing solution, the method comprising the step of passing a psicose-containing solution through an ion exchange resin column filled with a mixed bed ion exchange resin to obtain an ion-purified psicose-containing solution. In one embodiment of the method for purifying the psicose-containing solution, the mixed bed ion exchange resin is a mixture of strongly acidic cation exchange resin and weakly alkaline anion exchange resin, and the weakly alkaline anion exchange resin constituting the mixed bed ion exchange resin has a quaternary ammonium exchange capacity fraction of 0-10%. When the method for purifying the psicose-containing solution according to the present invention is used, not only the conductivity of the psicose-containing solution can be reduced to an acceptable level, but also psicose loss can be minimized by inhibiting conversion of psicose into psicose or other substances due to functional groups of an ion exchange resin. Therefore, the method for purifying the psicose-containing solution according to the present invention is suitable for mass production of high-quality psicose.

This invention discloses an acid-catalyzed controlled degradation and recycling method for waste polyester and polyester-cotton blended fabrics. Using waste polyester or waste polyester-cotton blended fabrics as raw materials, under the action of an acidic catalyst, in a mixed solvent composed of a polar aprotic solvent and water, the method involves heating and degradation, causing the polyester in the waste polyester or polyester-cotton blended fabrics to depolymerize or co-depolymerize, generating organic raw materials. This invention achieves complete depolymerization and recycling of polyester with a relatively low acid dosage, effectively avoiding the corrosion problems of equipment and excessive degradation of cotton fibers caused by existing technologies. It is also more conducive to the generation and recovery of glucose and 5-hydroxymethylfurfural. Furthermore, the separation steps are simple, greatly reducing separation costs, and high-yield recovery of terephthalic acid, glucose, and 5-hydroxymethylfurfural is achieved, realizing high-value recycling and utilization of various components in textiles, reducing waste, and improving resource utilization.

The present invention relates to inhibitors of protein fucosylation. More specifically, the present invention relates to carbocyclic compounds of formula (I) useful as inhibitors of protein fucosylation, or for the treatment of cancer, autoimmune diseases, infectious diseases, inflammatory diseases, or sickle cell diseases.