1896 results about "Peroxidase" patented technology

An improved biosensor having at least a first working electrode and a first electrode material disposed on the first working electrode. The first electrode material is a mixture made by combining at least one enzyme where the at least one enzyme is a capable of reacting with the analyte to be measured, a redox mediator capable of reacting with a product of an enzymatic reaction or a series of enzymatic reactions involving the at least one enzyme, a peroxidase capable of catalyzing a reaction involving the redox mediator where the redox mediator is oxidized, a binder and a surfactant.

Compositions, reagent test strips, analyte detection systems and kits of the same, as well as methods for their use in the detection of an analyte in a sample, are provided. The subject compositions are characterized by having a positively charged porous matrix and a urea derivative dye on at least one surface of the matrix, where in many preferred embodiments the urea derivative dye is a negatively charged urea derivative dye. In many preferred embodiments, the subject compositions further include at least one additional reagent member of a peroxide producing signal producing system, e.g., an analyte oxidase and/or a peroxidase. The subject compositions, test strips, analyte detection systems and kits find use in the detection of a wide variety of analytes in a sample, such as a physiological sample, e.g., blood or a fraction thereof.

A skin dressing, particularly a wound dressing, comprises oxidoreductase enzyme and, optionally, peroxidase enzyme, wherein the enzyme(s) are present in hydrated condition, e.g. being present in one or more hydrated hydrogels. The dressing is used by being located on the skin of a human or animal e.g. over a wound. The oxidoreductase enzyme catalyses a reaction that produces hydrogen peroxide from an appropriate substrate, the substrate either being naturally present in body fluids and/or being supplied separately and/or being incorporated into the dressing. The currently preferred oxidoreductase enzyme is glucose oxidase. The catalyses reaction of β-D-glucose substrate to give hydrogen peroxide and gluconic acid. A mixture of oxidoreductase enzyme can undergo reaction (optionally catalysed by the peroxidase enzyme) to produce a variety of species including reactive oxygen intermediates that have antimicrobial properties and that can therefore assist in promoting wound healing.

The present invention relates to methods and compositions for symptom-based differential diagnosis, prognosis, and determination of treatment regimens in subjects. In particular, the invention relates to the use of biomarkers, either individually or in combinations with one another to rule in or out diseases of the aorta and its branches, most particularly aortic aneurysm and/or aortic dissection, and for risk stratification in such conditions. Preferred markers include one or more of creatine kinase-BB (CK-BB), creatine kinase-MB (CK-MB), acidic calponin, basic calponin, B-type natriuretic peptide (BNP), NT-proBNP, proBNP, BNP_79-108, BNP_3-108, caldesmon, caspase-3, D-dimer, soluble elastin fragments, endothelial cell-selective adhesion molecule (ESAM), fibrillin-1, heart-type fatty acid binding protein, MMP-9, myeloperoxidase, myoglobin, smooth muscle myosin, smooth muscle myosin heavy chain, TIMP-1, free cardiac troponin I, complexed cardiac troponin I, free and complexed cardiac troponin I, free cardiac troponin T, complexed cardiac troponin T, and free and complexed cardiac troponin T, and preferred assays are configured to detect these markers.

The invention provides a Fenton-like catalyst which is chalcopyrite CuFeO2. A preparation method for the Fenton-like catalyst comprises the following steps: dissolving the raw materials ferric nitrate and cupric nitrate in water; adding alkali and a weak reducing agent to prepare a sol; and subjecting the sol to a hydro-thermal reaction so as to prepare the CuFeO2 Fenton-like catalyst. The Fenton-like catalyst provided by the invention has the advantages of simple preparation process, low cost, no organic solvent, environment-friendliness and stable chemical activity; since the particle of the Fenton-like catalyst is micron order, the Fenton-like catalyst can rapidly settle, and thus, the Fenton-like catalyst can be easily recovered and be repeatedly used many times. The Fenton-like catalyst can be used as a natural peroxidase substitute and used for detection and analysis of H2O2 content in food, biological and environmental samples and for degradation and mineralization of organic pollutants.

The invention relates to gold-core/platinum-shell nano bar analogue enzyme solution, which has a gold-core/platinum-shell structure consisting of a cylindrical gold nano bar inner core and an island-shaped polyporous platinum-shell layer coated on the outer surface of the cylindrical gold nano bar inner core. The preparation method comprises the following steps of: 1) preparing gold crystal seed solution containing 0.25 mM of gold; 2) preparing gold nano bar solution containing a gold nano bar; 3) purifying the gold nano bar solution until the gold nano bar content is 0.5 mM; 4) preparing thegold-core/platinum-shell nano bar analogue enzyme solution; 5) modifying the gold-core/platinum-shell nano bar analogue enzyme solution; and 6) purifying the modified gold-core/platinum-shell nano bar analogue enzyme solution. Gold-core/platinum-shell nano bar analogue enzyme prepared by a method combining seed modulation with post-reduction has catalytic activity similar to the catalytic activity of peroxidase and the catalytic activity of peroxidase; furthermore, the method is simple, and the solution is cheap, effective and environmentally-friendly; and the gold-core/platinum-shell nano bar analogue enzyme solution can serve as novel peroxide analogue enzyme or oxide analogue enzyme.

The present invention provides a novel chemiluminescent reagent producing chemiluminescence in the presence of hydrogen peroxide, extent of which depends on peroxidase concentration, chemiluminescent analysis method using the same, in particular useful for detection and quantitative analysis of various types of materials by measuring peroxidase enzyme activity or enzyme immunoassay with peroxidase enzyme as the marker.More particularly, the present invention provides a chemiluminescent reagent containing, as the major ingredients, a charge-transferring complex of N,N'-disubstituted-9,9'-bisacridinium salt and N,N-disubstituted carboxylic amide compound; chemiluminescent reagent containing further containing a specific aminoalcohol compound, in addition to the above; and method for measuring peroxidase activity at a high sensitivity in the presence of a peroxide, using the above chemiluminescent reagent.Moreover, the novel chemiluminescent reagent of the present invention can enhance sensitivity of the enzyme immunoassay with peroxidase enzyme as the marker by its chemiluminescent reaction.

The invention discloses a two-step enzyme measuring method and measuring reagents for creatinine in blood serum. The hydrogen peroxide generated by endogenous creatine is eliminated by utilizing catalase in a reagent 1 of the creatinine measuring reagents, and the catalase in the reagent 1 is suppressed by utilizing the catalase in a reagent 2 of the creatinine measuring reagents, so that the creatinine content in a sample is measured. The invention has the advantages that the phenomenon that the cost is increased because of oxidizing hydrogen peroxide by the catalase, so that the detection result is low in accuracy and precision is avoided.

The present invention relates to a method of particle separation comprising preparing a suspension of particles containing at least one recognizable target particle in a suspending solution, labeling the target particle with a conjugate marker, wherein the conjugate marker comprises at least one recognition unit for the recognizable target particle and at least one peroxidase enzyme, contacting a gelatin surface with the suspending solution, adding developer to the suspending solution in contact with the gelatin surface and in the presence of phenol to attach the target particle to the gelatin surface, and washing the gelatin surface to remove unattached particles. The method may also include detecting the presence of the target particle on the gelatin surface as well as detaching and recovering the attached particles after removal of the non-target particles.

The invention discloses a preparation method of a magnetic sandwich nano immunosensor and application of the preparation method. The preparation method is characterized by comprising the following steps: mixing and stirring a collaurum solution and silane ferriferrous oxide into a colorless and transparent solution, and carrying out magnetic separation by externally applying a magnet to obtain FE3O4/Au colloid nano magnetic beads; loading horse radish peroxidase (HRP) and secondary antibodies of an object to be measured to the FE3O4/Au colloid nano magnetic beads to obtain a secondary antibody probe Fe3O4/Au-HRP-Ab2; electrically depositing Au to a glassy carbon electrode, loading primary antibodies of the object to be measured, and then closing non-specific active sites by using protein to obtain an Abl/Au/GCE electrode; and finally, loading antigen to the Abl/Au/GCE electrode, and then obtaining the sandwich nano immunosensor by combining the magnet probe. The magnetic sandwich nano immunosensor can be used for measuring the concentration of melamine, tonyred, clenbuterol or estrogen in food and has the advantages of high detection speed, high accuracy and sensitivity and low cost.

The invention discloses a nano copper oxide analogue enzyme and a method for measuring hydrogen peroxide by using the nano copper oxide analogue enzyme as a peroxide analogue enzyme. The nano copper oxide analogue enzyme is nano copper oxide powder with a grain diameter ranging from 5 to 8 nanometers; the nano copper oxide is Cuo of a monoclinic system, the space group is C2/c; and the maximum absorption peaks of the typical ultraviolet-visible absorption spectra of the prepared nano copper oxide are at 280-nanometer positions. The nano copper oxide analogue enzyme is obtained by a chemical precipitation process. The nano copper oxide analogue enzyme has a catalytic property similar to that of peroxidase. When the nano copper oxide analogue enzyme is used in a 4-aminoantipyrine-ol system, the colorimetric detection of hydrogen peroxide can be realized, the hydrogen peroxide detection limit is 0.02mmol/L, and the linear range is 1mmol/L.

The invention relates to a method for simulating peroxidase by manganese dioxide nanosheet for detection of reductive biological molecules. The peroxidase simulated by manganese dioxide nanosheet can perform catalytic oxidation on substrates of 3,3',5,5'-tetramethyl benzidine TMB, 2,2-azino-di(3-ethyl-benzothiazoles-6-sulfonic acid) diammonium salt ABTS and o-phenylenediamine OPD, and changes the color from colorless to blue, green and orange respectively, at the same time, the manganese dioxide nanosheet can sensitively and selectively perform an oxidation reduction reaction with reductive biological molecules such as glutathione and ascorbic acid, oxidation product concentration of the substrates such as TMB, ABTS and OPD is changed, and then, the reductive biological molecules such as glutathione and ascorbic acid are subjected to quantitative determination through a colorimetric analysis method. The method has the characteristics of simple operation, high sensitivity, good reappearance and high selectivity; a detection linear scope of glutathione is 1-15 [mu]M, the detection limit is 0.3 [mu]M; the detection linear scope of ascorbic acid is 3-100 [mu]M, the detection limit is 0.8 [mu]M; and the method can be used for detecting various phenolic compounds.

The invention relates to a method for detecting hydrogen peroxide or glucose, based on ferroferric oxide nanometer particle mimetic enzyme, wherein the ferroferric oxide nanometer particle mimetic enzyme is obtained by co-precipitation method, the ferroferric oxide nanometer particle mimetic enzyme has the catalysis property similar to peroxidase, and the ferroferric oxide nanometer particle mimetic enzyme can be used to detect hydrogen peroxide for real-time presenting the colorimetric detection of hydrogen peroxide. The detected limit of hydrogen peroxide is 3x10<-6>mol/L, the linear range is 5x10<-6> to 1x10<-4>mol/L. The ferroferric oxide nanometer particle mimetic enzyme can be combined with glucose oxidase to realize the colorimetric detection of glucose. The detection limit of glucose is 3x10<-5>mol/L and the linear range is 5x10<-5> to 1x10<-3>mol/L. The colorimetric detection of glucose has high selectivity and sensitivity, without complex instruments.

The invention discloses bovine serum albumin-platinum composite nanomaterial mimetic peroxidase as well as a preparation method thereof and application. Bovine serum albumin is used as a template, and the bovine serum albumin-platinum composite nanomaterial mimetic peroxidase is prepared through biomineralization. Bovine serum albumin-platinum composite nanomaterials are prepared through the following method that chloroplatinic acid aqueous solutions are added to bovine serum albumin aqueous solutions and are mixed, sodium hydroxide aqueous solutions are added to obtain mixed solutions, and water bath heating is carried out; ultrafiltration is carried out on the solutions, then the solutions are washed, and bovine serum albumin-platinum composite nanomaterial aqueous solutions are obtained. The bovine serum albumin-platinum composite nanomaterials have excellent peroxidase activity, and can catalyze hydrogen peroxide oxidation 3, 3', 5, 5'-tetramethyl benzidine hydrochloride to be in color development. Meanwhile, the mimetic peroxidase resists acid and base, high temperature and high salinity, and has excellent short-term indoor temperature stability and long-term indoor temperature stability.

Novel compounds comprising a C—C double bond substituted at one carbon with two oxygen or sulfur atom-containing groups are disclosed. The compounds are useful in methods and compositions for generating chemiluminescence by reaction with a peroxidase enzyme and a peroxide. The chemiluminescence thus produced can be used as a detectable signal in assays for peroxidase enzymes and in assays employing enzyme-labeled specific binding pairs.

The invention relates to a technology system applicable to identification and evaluation of cold resistance of isolated parts of different bamboo varieties, in particular to a method for identifying and evaluating the cold resistance of bamboos. The method for identifying and evaluating the cold resistance of the bamboos is characterized by comprising the following steps of: a) taking a twig of the same bamboo age and with a length of 30 centimeters as a reference; b) quick-freezing a part of processed leaves in liquid nitrogen for 30 minutes and then storing the leaves into a refrigerator at the temperature of 80 DEG C below zero and the like. The method for identifying and evaluating the cold resistance of the bamboos is characterized by: a) conductivity determination; b) determination of soluble sugar content; c) determination of soluble protein content; d) malondialdehyde (MDA) determination; e) praline determination; f) determination of activities of superoxide dismutase (SOD); and g) determination of activities of peroxidase (POD).

The invention relates to a preparation method of high purified fructo-oligosaccharide, in particular to a method for preparing the high purified fructo-oligosaccharide by using immobilized enzyme. The preparation method of the invention prepares immobilized fructosyltransferase, immobilized glucose oxidase and immobilized mimic hydrogen peroxidase; then prepared enzymes are used to prepare the high purified fructo-oligosaccharide through an interrupted or continuous production method. In the preparation method, cheap metalporphyrin compounds are used as the mimic hydrogen peroxidase to replace expansive catalase; the fructosyltransferase, the glucose oxidase and the mimic hydrogen peroxidase are all immobilized and all can be recycled and reused; the stability and the operating factor of the enzymes are improved; the production cost for preparing the high purified fructo-oligosaccharide is greatly reduced. The preparation method can use one step method to directly produce the high purified fructo-oligosaccharide from cane sugar.

A method for increasing hydrogen peroxidase stability relates to a biological zyme used in clean production in textile industry. This invention takes the thermoascus aurantiacus IFO9862 as the initial strain to be prepared to get the hydrogen peroxidase after liquid deep fermentation to be ultrafitered, concentrated and added by certain stabilizers, NaCl, or glue or glycerol kept for 60days under 40deg.C its alive reservation is over 90%.

The invention provides a preparation method of nanocluster mimic enzyme with visible-light activity and a use of the nanocluster mimic enzyme in colourimetry detection of trypsin. Gold/silver nanoclusters modified by bovine serum albumin and mercaptosuccinic acid as surface modification agents has peroxidase-like catalytic characteristics under visible light irradiation and can catalyze chromogenic substrate oxidation. Compared with the peroxidase, the nanocluster mimic enzyme with visible-light activity is free of a high-concentration oxidizing agent and has high catalytic activity, good stability and eco-friendly catalytic conditions. Trypsin decomposes a protein template on the surface of the nanocluster so that the nanocluster surface state is changed and causes aggregation thereby reducing catalytic activity. The preparation method has a trypsin detection linear range of 9.0*10<-7> to 1.0*10<-3>g/mL and has a detection limit of 0.6 micrograms per milliliter far lower than trypsin content of urine and blood of patients.

A system and method for correcting the oxygen effect on oxidase-based analyte sensors includes an oxygen sensor with a working electrode, a reagent matrix disposed on at least the working electrode that contains a reduced form of a redox mediator, an oxidase and a peroxidase, an oxidase-based analyte sensor, a means for determining the oxygen concentration in a portion of a fluid sample using the oxygen sensor, means for determining an analyte concentration in another portion of the fluid sample using the oxidase-based analyte sensor, and means for using the oxygen concentration in the fluid sample to determine a corrected analyte concentration in the fluid sample.

A high-stability liquid chromometric enzyme reagent is prepared from buffering liquid, water-soluble chromogenic agent, 4-aminoantipyrin, peroxidase, oxidase for generating hydrogen peroxide and enzyme stabilizer. Its advantages are durable stability, and high efficiency and correctness.

The invention discloses a mesenchymal stem cell self-preserving liquid which is prepared from the following raw materials according to volume ratios: 1-6% of self platelet lysate, 95-97% of solution medium and 0-1% of vitamin C injection, wherein the solution medium is a mixed sugar electrolyte injection or physiological saline injection. The mesenchymal stem cell self-preserving liquid has the advantages that: growth factors contained in the mesenchymal stem cell self-preserving liquid can maintain the activity state of cells, the vitamin C can maintain the activity of various peroxidases, at the same time, the mixed sugar electrolyte injection is especially suitable for cell preservation, and osmotic pressure is also favorable for nutrient absorption of the cells so as to carry out metabolism; the activity of the mesenchymal stem cells which are preserved in the mesenchymal stem cell self-preserving liquid within 8 hours is still larger than 90%, the cell activity change is not larger than 7%, and the activity of the mesenchymal stem cells which are preserved in the mesenchymal stem cell self-preserving liquid within 12 hours is still maintained at 85%; and by using the mesenchymal stem cell self-preserving liquid, the requirements for human intravenous back-transfusion safety can be met, and the cell preserving problem of long-time transport is solved, thus more patients have opportunity to undergo mesenchymal stem cell treatment.

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.