407results about "Monosaccharides" patented technology

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 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.

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.

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 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.

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.

The proposal proposes a crystalline allulose with a defined particle size distribution, a process for its production, and its use. This new allulose grade is characterized by its improved shelf life and improved sensory and flavor properties of finished products made with it.

The present invention discloses a method for producing glucosylstevioside using mother sugar and a method for separating and purifying glucosylstevioside to recover glucose, which belongs to the technical field of food additives. [Solution] The present invention provides a method for producing glucosylstevioside using mother liquor sugar, which produces glucosylstevioside using mother liquor sugar as a raw material, thereby enriching the utilization routes of mother liquor sugar and filling the technical gap in the production of glucosylstevioside using mother liquor sugar as a raw material. The produced product also has the advantages of good texture and a high total glycoside content. The present invention provides a method for purifying glucosylstevioside, which recovers and utilizes dextrin, reduces waste liquid discharge, significantly reduces production energy consumption and costs, and improves the yield of high-purity glucosylstevioside. The present invention also provides a method for separating and purifying glucosylstevioside to recover glucose, which is simple and easy to operate, not only produces high-purity glucosylstevioside, but also recovers and utilizes unreacted substrate, thereby reducing costs.

The present invention provides a method for preparing crystalline fructose derived from sucrose, and belongs to the technical field of functional sugars. The preparation method of the present invention comprises the following steps: enzymolysis of a sucrose solution to obtain an enzymolysis solution; subjecting the enzymolysis solution to a first refining and a first chromatographic separation in sequence to obtain a first fructose solution and a first glucose solution; subjecting the first fructose solution to a second refining, crystallization, and centrifugation in sequence to obtain a mother liquor and wet fructose; at the same time, subjecting the first glucose solution to a third refining and isomerization in sequence to obtain a fructose / glucose mixed solution; subjecting the fructose / glucose mixed solution to a fourth refining and a second chromatographic separation to obtain a second fructose solution and a second glucose solution; and drying the wet fructose to obtain crystalline fructose. The present invention uses sucrose as a raw material to prepare crystalline fructose, reduces the use of acid and alkali, closely controls the material fluidity and the corresponding temperature zone, is conducive to the formation of a monodisperse crystal form and an increase in the number of crystals, and improves the crystallization yield.

The invention discloses a method for hydrolyzing and saccharifying wood fiber biomass. The method is characterized by comprising the following steps: (1) washing and drying materials; (2) crushing the materials; (3) preparing a material pretreatment solvent; (4) delignification of the material in a pretreatment solvent; (5) filtering the reaction liquid at normal temperature and normal pressure to separate liquid from solid to obtain cellulose; and (6) adding cellulose and polypeptide into deionized water according to a ratio of 2: 1-1: 2 in a solid-to-liquid ratio of 1: 50-1: 100, adding a NaOH solution to adjust the pH value of the solution to 3-8, and reacting at 40-95 DEG C under the protection of nitrogen for 6-16 hours to obtain the product glucose.

A binding syrup composition for formulating food products containing allulose and low sugar syrups is provided. The binding syrup composition overcomes limitations of allulose-containing products including product stickiness and failure to maintain shape and texture of the products. More particularly, the binding syrup compositions described herein contain low sugar syrups with low mono- and di-saccharide content in combination with allulose to provide 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 making 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.

The present invention relates to a psicose syrup with improved properties.

Disclosed are formaldehyde-free, thermally-curable, alkaline, aqueous binder compositions. Also disclosed are compositions comprising formaldehyde-free, thermally-curable binder compositions, as described herein, applied to non-woven fibers. Uses of the disclosed binder compositions as binders for non-woven fibers are also disclosed.

The present application relates to allulose crystals, which have an X-ray powder diffraction pattern including peaks at 2θ diffraction angles of 18.8±0.5°, 15.2±0.5°, and 19.5±0.5° in X-ray powder diffraction (XRD) analysis, a sweetener composition containing allulose crystals, and a method for producing allulose crystals.

The invention relates to the technical field of membrane separation, in particular to a glucose mother liquor nanofiltration membrane filtration parameter dynamic optimization process which comprises mother liquor pretreatment, intelligent nanofiltration filtration, clear liquid treatment, residual liquid deep saccharification and finished product preparation. A sulfonated chitosan-graphene modifier is added during pretreatment, a polyamide membrane is adopted for nanofiltration, the temperature, pressure and flow velocity are dynamically adjusted through a PLC-AI system, a TiO-ZnO nano liquid is synchronously added, clear liquid is concentrated, composite saccharifying enzyme is added for reaction, enzyme is added into residual liquid, nano aerogel is saccharified, and a finished product is dried through pulse hot air circulation. According to the process, AI dynamic regulation and control are combined with a nano material, so that the pollution resistance of a nanofiltration membrane is improved, the purity of glucose is improved to 92% or above, the yield is higher than 89%, oligosaccharide residues in saccharified liquid are reduced, drying energy consumption and COD emission are reduced, and high-value utilization of mother liquor is realized.

A carbohydrate composition derived from hardwood, which contains monomeric sugars in an amount of 75 to 98% by weight based on the total dry matter content of the carbohydrate composition, the monomeric sugars including monomeric xylose, the amount of monomeric xylose in the carbohydrate composition being 55 to 80% by weight based on the total dry matter content of the carbohydrate composition, and the carbonyl content of the carbohydrate composition being 1000 to 4500 μg / g based on the total dry matter content of the carbohydrate composition. Further disclosed are a method for producing this hardwood-derived carbohydrate composition and its use.