2208 results about "Oxidative enzyme" patented technology

A dual sensor for the simultaneous amperometric monitoring of glucose and insulin, wherein the glucose probe is based on the biocatalytic action of glucose oxidase, and the insulin probe is based on the electrocatalytic activity of metal oxide. Further provided is an oxidase enzyme composite electrode with an internal oxygen-rich binder. The present invention also optionally includes metallizing components within the carbon paste to eliminate signals from interfering compounds. The present invention includes embodiments for both in vitro and in vivo uses.

The invention discloses a biomacromolecule interpenetrating polymer network hydrogel and a preparation method of the biomacromolecule interpenetrating polymer network hydrogel. The biomacromolecule interpenetrating polymer network hydrogel is formed by crosslinking two kinds of enzymes in a catalysis mode, one is a polysaccharide macromolecule network formed by crosslinking polysaccharide macromolecules with introduced phenolic hydroxyl groups in an oxidation mode as oxidase and hydrogen peroxide catalyze phenolic hydroxyl groups, and the other is a protein or polypeptide macromolecule network formed crosslinking protein or polypeptide containing amino acid residues as transferase catalyzes peptide bonds. The two networks interpenetrate each other and form the novel interpenetrating polymer network hydrogel without bonding of chemical bonds. No chemical crosslinking agent is used in the hydrogel, and the hydrogel has excellent biocompatibility and mechanical property, can be shaped like a dry or wet film, like porous sponge or fibers, and can serve as a contact lens, a medicine release carrier, a scaffold for tissue engineering or materials for tissue repair.

Methods are disclosed for increasing the effectiveness of dextromethorphan in treating chronic or intractable pain, for treating tinnitus and for treating sexual dysfunction comprising administering dextromethorphan in combination with a therapeutically effective dosage of a debrisoquin hydroxylase inhibitor. A preferred combination is dextromethorphan and the oxidative inhibitor quinidine.

The properties of dough or bread can be improved by the addition of a carbohydrate oxidase which can oxidize the reducing end of an oligosaccharide more efficiently than the corresponding monosaccharide, e.g., preferentially oxidizing maltodextrins or cellodextrins over glucose. A novel carbohydrate oxidase having the capability to oxidize maltodextrins and cellodextrins more efficiently than glucose may be obtained from a strain of Microdochium, particularly M. nivale. The amino acid sequence of the novel carbohydrate oxidase has very low homology (<20% identity) with known amino acid sequences.

The present invention relates to an enzyme electrode useful for estimation of cholesterol in aqueous medium, said electrode comprising: i. an electrically conductive base plate, ii. a film of sol gel derived material deposited thereon, said sol gel derived material of step b) being microencapsulated cholesterol oxidase with an electron mediator. The present invention also relates to a process for the preparation of an enzyme electrode by coating an immobilized cholesterol oxidase (ChOx) and mediator on a silicate sol gel by microencapsulation.

(Aza)indolizine derivatives represented by Formula (I) having xanthine oxidase inhibitory activities and useful as agents for the prevention or treatment of a disease associated with abnormality of serum uric acid level, prodrugs thereof, salts thereof or the like. In Formula (I), 0 to 2 of X¹, X², X³ and X⁴ are a nitrogen atom and the others are CR¹; one of T¹ and T² represents cyano and the other represents a group represented by Formula (A), with the proviso that when T¹ is cyano, at least one of X¹ to X⁴ is a nitrogen atom; R¹ independently represents a hydrogen atom, a halogen atom, a hydroxy group, C_1-6 alkyl, C_1-6 alkoxy or the like; ring U represents a benzene ring or the like; m represents integral number from 0 to 2; R² independently represents a fluorine atom, a hydroxy group or the like.

The invention discloses an E. coli BL21(pETDuet-ydjLnox) containing a 2R,3R-butanediol dehydrogenase gene ydjL and an NADH oxidase gene nox, wherein the strain is preserved in the 'China Center for Type Culture Collection' on December 23 in 2008, and the preservation number is CCTCC NO: M 208259. The invention also discloses application of a gene recombination bacterium in producing chiral S-AC by catalyzing meso-BD, producing chiral R-AC by catalyzing 2R,3R-BD and producing chiral pure 2S,3S-BD by splitting a 2,3-BD mixture. The concentration of a chiral AC prepared from the recombinant E. coli can reach over 6 grams per liter (the ee value is more than or equal to 96 percent); and the ee value of the chiral pure 2S,3S-BD is more than or equal to 98 percent, and the regeneration of a cofactor is achieved, thus the gene recombination bacterium has great industrial application prospect.

The invention discloses a method for quantitative detection of biological molecules capable of being metabolized to generate H2O2 in serum by means of a ratiometric fluorescent probe. The method includes firstly preparing copper-nitrogen codoped carbon dots Cu-CDs; then reacting corresponding oxidase and the biological molecules capable of being metabolized to generate H2O2 to generate H2O2; catalyzing the H2O2 and a substrate that is o-phenylenediamine with horseradish peroxidase to generate an oxidation product DAP having yellow fluorescence; then adding the Cu-CDs into the DAP; allowing the DAP and the Cu-CDs to form ratiometric fluorescence, with the ratio I<572>/I<460> of fluorescence intensities of the DAP and the Cu-CDs being in a linear relationship with the concentration of a substance to be detected; and performing quantitative assay of the biological molecules in the serum according to the ratio of fluorescence intensities. The method is high in sensitivity and simple and convenient in detection, and has high selectivity and high affinity of immunoreactions.

There is provided a process for the prevention and/or reduction of Maillard reaction in a foodstuff containing (i) a protein, a peptide or an amino acid and (ii) a reducing sugar, the process comprising contacting the foodstuff with an enzyme capable of oxidising a reducing group of the sugar.

The invention discloses pleurotus citrinopileatus sing ultrafine power cultured by using ramulus mori stems as major ingredients and a production method of the pleurotus citrinopileatus sing ultrafine power. The production method is characterized in that the ramulus mori stems is adopted as the major ingredients of the pleurotus citrinopileatus sing ultrafine power, 35-55 DEG C low-temperature vacuum drying is carried out for 4 to 5 hours, the crushing is carried out by a 500-1000-mesh sieve ultrafine crushing machine, and the pleurotus citrinopileatus sing ultrafine dry power is obtained. The pleurotus citrinopileatus sing ultrafine power and the production method have the advantages that the original nutrition and health care characteristics of pleurotus citrinopileatus sing can be maintained, the activity of B type monoamine oxidase is inhibited, in addition, the peroxyl lipid content of the liver can be reduced, the lipofuscin content of the heart is reduced, the activity of SOD (super oxygen dehydrogenises) in red blood cells can be improved, good effects of nourishing yin and yang, delaying senescence, preventing and resisting cancer, lowering the blood pressure and the like are realized, in addition, more convenient edible performance and efficient utilization performance of the health care ingredients are realized, and meanwhile, the silkworm industrial chain can be favorably prolonged.

The invention discloses a platinum nano-material with the activity of four mimic enzymes and a preparation method thereof. The preparation method comprises the following steps: using citrate ions as a modifier, reducing chloroplatinic acid by utilizing sodium borohydride, and preparing the platinum nano-material modified by citric acid. The platinum nano-material is simply and quickly prepared, the particle size is small, and the dispersibility and stability of a water solution are high. The obtained platinum nano-material has the activity of four mimic enzymes at the same time, and comprises peroxidase, oxidase, catalase and superoxide dismutase. The activity of the four mimic enzymes of the platinum nano-material can be adjusted and controlled through the concentration of the citrate ions used in the preparation process.

The invention provides enzymatic methods for direct determination of percentage of glycated hemoglobin in blood samples without the need of a separated measurement of total hemoglobin content in blood samples. The methods utilizes one or two different types of oxidizing agents which selectively oxidize low-molecular weight reducing substances and high-molecular weight (mainly hemoglobin) reducing substances in blood samples, coupled with enzymatic reactions catalyzed by proteases, fructosyl amino acid oxidase, and peroxidase. The invention provides kits for performing the methods of the invention.

The invention pertains to the technical field of biologic degrading for chemical pesticide, and relates to a bacterial strain that can efficiently degrade Pyrethroid, Organophosphorus and vermectins pesticides and the application of the bacterial strain. The bacterial strain is an Acinetobacter sp. JCX22D bacterial strain, the biologic fature of the bacterial strain is Gram's negative, free from flagella, in form of short rod, is of esterase and lipase activity, free from oxidase activity, and can take use glucose and fructose. The bacterial strain is resistant to Ampicillin and low-concentration Spectinomycin and nalectin, and not resistant to rifamide. The degrading efficiency of the bacterial straine is more than 72% for high-efficiency cypermethrin, cyhalothrin, decamethrim, bifenthrin pesticid, is more than 70% for diazinon, parathion-methyl, phoxime and chlorpyrifos, and is 90% for vermectins. The bacterial strain can be used for biologically degrading above pesticides, and biologically recovering or cleaning any water body, soil and agricultural products that are polluted by pesticides.

Methods of treating pulp stocks with an enzyme formulation containing one or more oxidative enzymes, to reduce pitch deposition, control pitch related problems, modify the physical and/or chemical properties of tri, di-, and mono-glycerides, fatty acids, resin acids, esters of fatty acids and resin acids, and metal soaps of fatty acids and resin acids, or change the concentration of triglycerides, fatty acids, resin acids, and esters of fatty acids and resin acids, have been developed. The pulp stock is treated with an enzyme formulation containing laccases, peroxidases, esterases, and/or combinations thereof. The enzyme formulations may also contain a laccase mediator and/or a dispersant. The enzyme formulation can be applied at any of several locations during the pulping and/or papermaking process. The enzyme formulation is typically applied as a solution to the pulp stock. The enzyme treatment is effective at a temperature of between about 30° C. to about 95° C., more preferably from about 50° C. to about 80° C. The pH of the pulp stock is from about 4.0 to about 7.0, more preferably from about 4.5 to 5.5. The stock can be treated for a period of time ranging from about 5 minutes to about 10 hours.

The invention discloses escherichia coli genetically engineered bacteria co-expressed by three enzymes. The escherichia coli genetically engineered bacteria are characterized in that an L-amino-acid oxidase gene, a (D/L)-alpha-hydroxyl carboxylic acid dehydrogenase gene and a gene capable of reducing NAD(P) are imported. The invention also discloses a construction method and an application of the recombinant escherichia coli. The method is used to biologically synthesize optically pure alpha-hydroxyl carboxylic acid, has the characteristics of simple operation, low cost, high product synthesizing efficiency and high optical purity, and has a good industrial prospect.

The invention discloses a D-amino acid oxidase mutant and application thereof. The mutant is obtained by carrying out single mutagenesis or multiple mutagenesis on a 52nd site, a 54th site, a 58th site, a 213rd site and a 335th site of amino acid with an amino acid sequence shown in SEQ ID NO.1, wherein glycine at the 52nd site is mutated into leucine, asparagine at the 54th site is mutated into valine, phenylalanine at the 58th site is mutated into glutamine, methionine at the 213rd site is mutated into serine, and serine at the 335th site is mutated into glycine. According to the D-amino acid oxidase mutant and the application thereof, a D-amino acid oxidase gene with an amino acid sequence as shown in SEQ ID NO.2 is mutated by utilizing a site-saturation mutagenesis technology, so thatthe enzyme activity and the product conversion rate are far higher than those of a wild type, and therefore the product yield in a 4-(hydroxymethylphosphoryl)-2-carbonyl-butanoic acid production process is increased.