41 results about "Aldose" patented technology

A continuous process for converting carbohydrates to ethylene and propylene glycol. The carbohydrates are mixed with water and passed through a reactor at a temperature that hydrolyzes the carbohydrate mixture at least partially to monosaccharides. The reactor has a first zone comprising a retro-aldol catalyst and a second zone comprising a reducing catalyst. The aldose is converted in the first zone into glycolaldehyde by the retro-aldol catalyst and the glycolaldehyde, in the presence of hydrogen, is converted to ethylene glycol in the second zone of the reactor. The reaction products are removed from the reactor and the ethylene glycol is recovered. The selectivity to propylene glycol can be enhanced via feeding ketose as the carbohydrate.

A process by which 5-deoxy-L-arabinose, which is important as a material for the production of saproterin, a useful therapeutic agent for atypical hyperphenylalaninemia, can be industrially and efficiently produced even with a simple production apparatus. The process for 5-deoxy-L-arabinose production is characterized by reacting L-rhamnose with a C11-16 linear alkyl mercaptan compound in the presence of an acid catalyst to yield an L-rhamnose di(alkyl mercaptal), subsequently subjecting the resultant compound to an oxidation reaction to obtain a sulfonyl derivative, and then subjecting it to a carbon diminution reaction. This production process is applicable to a process for the production of a compound formed by removing one carbon atom from another aldol compound. Thus, the process is one for producing carbon-diminished compounds of general aldoses.

The present invention relates to a method for producing a furan-based compound using an ion exchange resin in the presence of an organic solvent. In the method for producing a furan-based compound according to the present invention, a furan-based compound is made from an aldose-type hexose compound in the presence of an organic solvent by using an anion exchange resin and a cation exchange resin. Thus, the aldose-type hexose compound obtained from biomass by simultaneously or consecutively using the anion / cation exchange resins as catalysts can be made into 5- hydroxymethyl-2- furfural (HMF) or alkyl ether derivatives thereof such as 5- alkoxymethyl-2- furfural (AMF) without using an expensive reagent. Also, since the selection of an organic solvent is not limitative and a heterogeneous catalyst can be used, separation and purification is easy and chemically stable AMF can be directly obtained. Further, the conversion efficiency of the aldose-type hexose compound is excellent, and the hexose compound can be used at a high concentration.

An α-selective glycosylation process of a glycosylation reaction between a sugar structure of hexose or an aldose having a chain with six or more carbon atoms in the molecule, which is a monosaccharide or a reducing end of an oligosaccharide with two or more monosaccharide residues connected by glycosidic linkages (an oligosaccharide with two monosaccharide residues is disaccharide) (also referred to as “a disaccharide to an oligosaccharide”) or a sugar chain and alcoholic hydroxyl group or thiol group, to obtain a sugar structure glycoside containing α-glycoside at a high ratio, under the ring-shaped formation of a protective group in a silyl acetal structure over hydroxyl groups at positions 4 and 6 in the sugar structure.By the process, highly selective α-glycosylation of sugar structure can be progressed in a simple and efficient manner.

The invention relates to a biosynthesis method of 2-deoxy scarce aldose such as 2-deoxy-D-ribose aldolase by using aldolase, and discloses protein sequences of two 2-deoxy-D-ribose 5-phosphate aldolase mutants, and a constructed Escherichia coli recombinant bacterial strain L1 containing encoding genes of the 2-deoxy-D-ribose 5-phosphate aldolase mutants. Experiments show that the recombinant strain can catalyze reaction of acetaldehyde and a variety of aldehyde groups to produce 2-deoxy aldose by using resting cells, and has strong substrate tolerance. For example, recombinant strain can synthesize 2-deoxy-D-ribose by using aldehyde and D-glyceraldehyde as substrates, synthesize 2-deoxy-L-ribose by using acetaldehyde and L-glyceraldehyde as substrates, and synthesize 2-deoxy-D-altrose by using acetaldehyde and D-erythrose as substrates. Therefore, the Escherichia coli recombinant bacterial strain L1 provided by the invention can be applied to the production of deoxidation deoxy scarce aldose, and the obtained deoxy aldose has wide application prospect in the industries of food and medicine.

The purpose is to quantify the total phosphorous in water of interest safely and within a short time. Provided is a method for quantifying the total phosphorus in water of interest by decomposing phosphorous compounds contained in the water to convert the phosphorous compounds into phosphate ions and determining the quantity of the phosphate ions in the water, wherein an alkali metal salt of peroxydisulfuric acid and sulfuric acid are added to the water and the resulting mixture is heated at a temperature ranging from 65 DEG C to a boiling point for a predetermined period. Subsequently, a color-developing agent comprising at least one hydroxy-group-containing compound selected from a group of hydroxy-group-containing compounds consisting of hydroxycarboxylic acids and alditols, a saccharide compound selected from a group of saccharide compounds consisting of aldoses having 5 carbon atoms, aldoses having 6 carbon atoms, ketoses having 6 carbon atoms and monosaccharide-generating compounds capable of being decomposed to generate any one of the aforementioned monosaccharides and hexaammonium heptamolybdate is added to the water, the resulting mixture is heated at 65 DEG C or higher for a predetermined period, and the absorbance of any wavelength ranging from 600 to 950 nm in the water is measured.

The present invention belongs to the field of organic synthesis, relates to a method for synthesizing a saponin, and in particular, to a method for constructing a glycosidic bond in a saponin, and comprises the following steps: directly reacting an excessive amount of aldose or ketose with aglycone in a suitable organic solvent at 30 °C to a reflux temperature and with the presence of an acid catalyst, to obtain a target product saponin.

The present invention relates to a method for producing a furan-based compound using an ion exchange resin in the presence of an organic solvent. In the method for producing a furan-based compound according to the present invention, a furan-based compound is made from an aldose-type hexose compound in the presence of an organic solvent by using an anion exchange resin and a cation exchange resin. Thus, the aldose-type hexose compound obtained from biomass by simultaneously or consecutively using the anion / cation exchange resins as catalysts can be made into 5-hydroxymethyl-2-furfural (HMF) or alkyl ether derivatives thereof such as 5-alkoxymethyl-2-furfural (AMF) without using an expensive reagent. Also, since the selection of an organic solvent is not limitative and a heterogeneous catalyst can be used, separation and purification is easy and chemically stable AMF can be directly obtained. Further, the conversion efficiency of the aldose-type hexose compound is excellent, and the hexose compound can be used at a high concentration.

Object: To provide a thermostable L-ribose isomerase.Means for Resolution: The thermostable L-ribose isomerase with MW. 32,000 (by SDS-PAGE), optimal temperature of 45° C., optimal pH of pH 9.0 (glycine-NaOH buffer), and stable physicochemical properties such as temperature stability up to 45° C. during thermal treatment at pH 9.0 for 10 minutes, and with an action to isomerize L-ribose to generate L-ribulose or of inversely to isomerize L-ribulose to generate L-ribose. A conversion method between an aldose and a ketose comprising allowing the thermostable L-ribose isomerase as an enzyme derived from (1) Raoultella ornithinolytica strain MB426 (NITE BP-277) to interact with an aldose selected from L-ribose, D-lyxose, D-tallose, D-mannose, L-allose and L-gulose to isomerize the aldose to generate a ketose selected from the individually corresponding L-ribulose, D-xylulose, D-tagatose, D-fructose, L-psicose and L-sorbose or to interact with a ketose selected from L-ribulose, D-xylulose, D-tagatose, D-fructose, L-psicose and L-sorbose to isomerize the ketose to generate an aldose selected from the individually corresponding L-ribose, D-lyxose, D-tallose, D-mannose, L-allose and L-gulose.

The present invention relates to a phytospingosine derivative generated by a condensation reaction of phytospingosine and maltose or lactose, which is an aldose-based disaccharide, and to a composition containing the same. The phytospingosine derivative of the present invention has high solubility in water compared with phytospingosine, is easy to formulate since the stabilization problem in a solution is solved, and maintains or further enhances the antibacterial effect of phytospingosine.

The present invention provides a monosaccharide solid shaped product and a preparation method thereof, wherein the monosaccharide solid shaped product comprises: 100 parts by weight of monosaccharide, wherein the monosaccharide is a five-carbon aldose, a six-carbon aldose or a combination thereof 3-15 parts by weight of disaccharide; the total weight of the monosaccharide and disaccharide accounts for 10%-100% of the monosaccharide solid shaped product. The present invention obtains the monosaccharide of a solid shaped product by inhibiting the rapid water absorption of the monosaccharide, which is easy to carry, convenient to store and convenient to use; the method described in the present invention has simple process and is easy to manufacture.

Provided is a dietary fiber characterized in that bitterness and unpleasant aftertaste are restrained. The dietary fiber has terminal sugars and is characterized in that the ratio of aldoses relative to the total of the terminal sugars is 10% or less. Such a dietary fiber may be, for example, indigestible dextrin, polydextrose or the like. The dietary fiber may be used as a food additive (for example, a beverage additive).

The method comprises the following steps: adding an organic solvent into a closed reaction container, then adding aldose accounting for 1-10% of the mass of the organic solvent and a catalyst accounting for 1-50% of the mass of the aldose into the organic solvent, then introducing an oxygen-containing atmosphere of 0.1-10 Mpa, and reacting at the reaction temperature of 180-280 DEG C for 1-20 hours to prepare the methyl glycolate. Compared with the prior art, the method for producing the methyl glycolate by taking the aldose as the raw material is very cheap and efficient, the raw material in the method is biomass aldose which is wide in source, the reaction condition is mild, the catalyst is high in activity, good in selectivity and few in by-product, molecular oxygen is taken as an oxidizing agent, the method is green and environment-friendly, and the yield of the methyl glycolate is high.