61 results about "Alcohol oxidase" patented technology

The invention provides a spittle alcoholicity test strip and a production method thereof. The test strip comprises a substrate and a reaction test strip which is adhered to the surface at one side surface of the substrate; and the reaction test strip is dry filter paper which is soaked in a color-developing agent solution and a bi-enzymatic reaction liquid in sequence. The production method comprises the following steps of: soaking the filter paper in the color-developing agent solution and then drying the filter paper by means of being protected from light at a room temperature to obtain developing filter paper; and soaking the developing filter paper into the bi-enzymatic reaction liquid and then drying the developing filter paper by means of being protected from the light at the room temperature to obtain the reaction filter paper. The bi-enzymatic reaction liquid contains alcohol oxidase with the activity unit of 80 U/ml, peroxidase with the activity unit of 80 U/ml, bovine serum albumin which accounts for 1.6% of the total weight of the bi-enzymatic reaction liquid, trehalose which accounts for 1.5% of the total weight of the bi-enzymatic reaction liquid, and the balance of 0.3 M phosphate buffer with the pH value of 7.5. The test strip has the advantages of fastness and accuracy in detection, high sensitivity and good stability. Furthermore, the production method is simple, practical and very reliable.

This invention relates to a preparation method of test paper for detecting alcohol content in saliva and test paper prepared thereby. Wherein, using pure cotton pulp filter paper as the bottom carrier of test paper; with solid chemistry technique, adding in turn the tetramethyl benzidine, phosphate buffer, HRP, alcohol oxidase and BSA on the paper, and multiple-step vacuum drying. This invention is safe and reliable for test, can read result directly with color-matching card, and has well repeatability for wide application.

The present invention is a test kit comprising a plurality of individually-sealed test strips, each for detecting the presence and intensity of alcohol in breast milk. Each test strip is formed from a porous (absorbent) carrier matrix, and a color-change reagent resident on the carrier matrix. The color-change reagent comprises an alcohol oxidase enzyme and a hydrogen donor indicator that changes color when oxidized. In addition, a comparative color chart is provided, including a plurality of color swatches, a numerical scale of blood alcohol concentration, and a quantitative safe/not safe warning. The reagent on the test strip indicates the presence of alcohol in breast milk. The test kit includes a number of test strips and a color chart to allow breast feeding mothers to ascertain the concentration of alcohol in their breast milk to ensure that breast milk fed to infants is free of alcohol.

The invention discloses an establishing method of an engineering strain for biologically producing ferulic acid and application of the engineering strain in production of the ferulic acid. The engineering strain enables a vanillyl alcohol alcohol oxidase gene, a coniferyl alcohol dehydrogenase gene and a coniferyl aldehyde dehydrogenase gene to be connected in series and multiply strongly expressed in escherichia coli by using a T7 promoter, and then eugenol is catalyzed to generate the ferulic acid through enzymatic reaction. Through the bioconversion method of the ferulic acid, poisoning of substrate eugenol to a production strain is avoided; the characteristics of simple process and high conversion rate are achieved.

The invention discloses a process for preparing phytase by efficiently fermenting recombinant pichiapastoris and a special batch fermentation culture medium thereof. The process comprises a thalli growth stage and an exogenous gene induction expression stage and relates to promoters such as an alcohol oxidase promoter, a methanol promoter and the like. The culture medium in a fed-batch fermentation stage adopts a low-salt formula which comprises the following components in percentage by weight: 3 to 6 percent of carbon source, 1.5 to 3 percent of nitrogen source, 0.8 to 1.0 percent of magnesium sulfate, 0.5 to 1.0 percent of potassium sulfate and 0.3 to 0.4 percent of monopotassium phosphate, wherein fermentation temperature is between 27 and 30 DEG C; and fermentation pH is between 4.5 and 5.5. Methanol induction in the exogenous gene induction expression stage is performed in five stages. The preparation process of the invention has the advantages of lower cost and higher phytase fermentation activity.

The invention belongs to the technical field of detection of alcohol in saliva and discloses a reagent strip for detecting the alcohol content in saliva, a preparation method of the reagent strip anda kit. The reagent strip contains bovine serum albumin and sodium alginate. The bovine serum albumin has good solubility, can be dissolved into a buffer solution at the normal temperature and can be uniformly mixed with alcohol oxidase and a horse radish peroxidase solution, so that the decomposition and nonspecific adsorption of enzyme are prevented; and sodium alginate has viscidity and can be tightly adsorbed to the surface of the bovine serum albumin after being mixed with the bovine serum albumin. The bovine serum albumin and sodium alginate are commonly used as an additive of alcohol oxidase and horse radish peroxidase, so that the oxygen and moisture in air are effectively isolated, the decomposition and nonspecific adsorption of enzyme are prevented, the false positive phenomenon generated in a detection process of a product is avoided, and the product has excellent stability.

The invention relates to an electrochemical ethyl alcohol sensor based on ethyl alcohol oxidase and a preparing method thereof. The sensor is provided with three electrodes, the working electrode is covered with an ethyl alcohol oxidase film, ethyl alcohol in sample gas is selectively oxidized into acetaldehyde by means of the ethyl alcohol oxidase, and current generated through oxidization of acetaldehyde on the working electrode has a linear relation with the concentration of ethyl alcohol. An enzyme catalyst layer of the ethyl alcohol oxidase film is not conductive and is an electrochemical inactive layer, and all reactions relevant to enzyme have no direct relation with the current of the working electrode of the electrochemical sensor. Catalytic reaction products of enzyme are diffused into the working electrode for further reaction, and then electrochemical current is generated and has a linear relation with the concentration of ethyl alcohol. The working electrode of the sensor is a low-activity material. The response time of the ethyl alcohol sensor is short, test results are accurate, the ethyl alcohol sensor makes no obvious response to other organic gas but has extremely high selectivity and sensitivity to ethyl alcohol, and the ethyl alcohol sensor can better meet the requirement for ethyl alcohol detection in complicated environments.

The present invention relates to a method for producing a recombinant, spider toxin peptide and analgesic compositions containing said peptide. More specifically, the present invention relates to a method in which the gene for GsMTx4 is subcloned into a vector, so that it is linked to a secretion signal sequence of the alpha factor and under the control of methanol-inducible alcohol oxidase (AOX) promoter to construct a recombinant yeast expression plasmid. Yeast cells are transformed with this plasmid to produce the GsMTx4 peptide and analgesic compositions containing said peptide. The recombinant yeast expression system of the present invention affords a more stable method for producing GsMTx4 than its natural route. Thus the GsMTx4 peptide and its derivatives produced by the method of this invention can be used in the cure of related diseases such as heart failure as the peptide specifically inhibits mechanosensitive ion channels.

The invention disclosed herein includes nanocomplexes that are designed include enzymes that have complementary functional attributes and methods for using these nanocomplexes. Illustrative examples include nanocomplexes that comprise both an alcohol oxidase enzyme as well as a catalase enzyme. These nanocomplexes can be used in methods designed to lower blood alcohol levels in vivo, and/or to break down the toxic byproducts of alcohol metabolism. Consequently these nanocomplexes can be used to treat a variety of conditions resulting from the consumption of alcohol, including for example, acute alcohol intoxication.

The invention discloses a preparation method of an immobilized enzyme nanofiber membrane for detecting the alcohol content in spit. The preparation method comprises the steps of: covalently binding alcohol oxidase through a polymer such as polyethylene glycol or polyethyleneimine as an arm molecular multi-site; further fixing a plurality of subunits of the alcohol oxidase by the polyethyleneimine, polylysine, poly-histidine or chitosan and the like through physical action among charges; then absorbing indigo blue as a chromogenic substrate; generating hydrogen peroxide after ethanol in a sample is oxidized by the alcohol oxidase in detection; leading the indigo blue to fade by the hydrogen peroxide, and conveniently calculating the ethanol concentration in the sample by comparing the fading degree of the indigo blue with a standard color atla. The preparation method is high in sensitivity, simple and convenient to operate, and low in price, can be repeatedly used for a plurality of times, and can be conveniently used for investigating and treating drunk driving by a law-enforcing department; and the reliable evidence is provided for the law enforcement process.

The invention discloses an alcohol quantitative analysis method based on a double-enzyme-inorganic nanoflower composite material. The method comprises the following steps: adding alcohol oxidase (AOX), horse radish peroxidase (HRP) and CaCl2 solution into a phosphate buffer solution, standing and reacting at room temperature to obtain the double-enzyme-inorganic nanoflower composite material (AOHNF). The reaction conditions are simple, and the enzyme activity and stability of the obtained material are remarkably enhanced. Alcohol in the solution is catalyzed and oxidized by using AOX to generate H2O2, TMB is catalyzed by using HRP to react with H2O2 to enable the solution to be blue, and the absorbance of the absorption wavelength at 650 nm is measured, so that the alcohol concentration inthe solution is obtained. The analysis method is simple to operate and high in detection result sensitivity. Double enzyme-based method disclosed by the invention The alcohol quantitative analysis method based on the double-enzyme-inorganic nanoflower composite material has the characteristics of simplicity in operation, high sensitivity, good stability and the like, and has a good development prospect.

A test kit detects presence of ethanol alcohol in human breast milk. The test kit includes an alcohol oxidase reactive in the presence of ethanol alcohol in breast milk and oxygen, an indicator having a visible color when not subjected to oxidizing agent, in sufficient amount for visible observance, and a peroxidase reactive in the presence of acetaldehyde and peroxide, to yield oxidizing agent, in sufficient amount to induce change to the visible color of the hydrogen donor indicator. The test kit is a sealed pack containing a test strip. The test strip is for one-time use, and disposable after testing. The test strip is handled by a tester, typically a breast-feeding mother. The mother contacts her breast milk lactate with testing portion of the test strip. The testing portion selectively reacts to alcohol, and not other components of breast milk. A reactive agent of the testing portion of the test strip changes color in the presence of alcohol. The mother observes the result to determine if there is presence of alcohol in the breast milk.

The invention relates to an inositol oxidase mutant, as well as a coding gene and application thereof, belonging to the technical field of gene engineering. According to the inositol oxidase mutant, plasmids pACYCDuet-MIOX-Udh containing wild inositol oxidase coding genes are adopted as a template, an error PCR technology is used to obtain an inositol oxidase MIOX random mutation library; a high GA yield inositol oxidase mutant can be obtained by high throughput screening of biosensor, and the inositol oxidase mutant has relatively high catalytic activity and can be applied to the fields of enzyme engineering, gene engineering, metabolic engineering and the like.

The invention discloses a method for continuously preparing a 2-benzyl isoindolinone compound by adopting a microchannel reactor, which comprises the following steps: (1) respectively and simultaneously pumping a mixed solution containing 1,2-Benzenedimethanol, alcohol oxidase, flavin adenine dinucleotide and hydrogen peroxide reductase and air into a microchannel reaction device; carrying out a first reaction in a first microreactor containing nano MnO2; and (2) respectively and simultaneously pumping the first reaction effluent and a benzylamine compound solution into a second microreactor, and carrying out a second reaction to obtain the 2-benzyl isoindolinone compound as shown in a formula IV. The method has the advantages of short reaction time, high reaction conversion rate, few side reactions, small toxicity and pollution, low production cost, good product quality and the like, does not use noble metal catalysis in the reaction process, is green, environment-friendly, energy-saving and efficient, is suitable for popularization and application, and solves the problems of long reaction time, harsh reaction conditions and need of noble metal catalytic catalyst in the prior art.

The present invention provides formaldehyde dehydrogenase genes (FLD) from methylotrophic yeasts. The FLD structural genes confer resistance to formaldehyde and are therefore useful as a selectable marker in methylotrophic yeasts. The FLD promoter sequences are strongly and independently induced by either methanol as sole carbon source (with ammonium sulfate as nitrogen source) or methylamine as sole nitrogen source (with glucose as carbon source). Induction under either methanol, methylamine or both provides levels of heterologous gene expression comparable to those obtained with the commonly used alcohol oxidase I gene promoter (P_AOX1). The FLD promoter of Pichia pastoris (P_FLD1) is an attractive alternative to P_AOX1 for expression of foreign genes in P. pastoris, allowing regulation by carbon (methanol) or nitrogen (methylamine) source within the same expression strain. Yeast strains, expression cassettes, expression vectors, and host cells comprising an FLD gene promoter and 3′ termination sequence are also provided.

The invention relates to a recombinant pichia pastoris strain for regulating and controlling transglutaminase expression of zea mays through a TEF1 promoter. The recombinant pichia pastoris strain isa genetically engineered strain obtained in the mode that transglutaminase from the zea mays is transferred to pichia pastoris. According to the recombinant pichia pastoris strain, an alcohol oxidasepromoter PAOX1 in a pPIC9K plasmid is replaced by a promoter PTEF1 of a translation extension factor 1-alpha, the promoter PTEF1 is connected with a transglutaminase gene to form a loop, and a recombinant expression vector is constructed. The recombinant strain is easy to culture, high in secretion capacity and beneficial for mass transglutaminase expression, the enzyme activity can reach 479 mU/mL, and the recombinant pichia pastoris strain has the advantages of being safe and reliable and has important application prospects.

Alcohol intoxication causes serious diseases, whereas current treatments are mostly supportive and unable to remove alcohol efficiently. Upon alcohol consumption, alcohol is sequentially oxidized to acetaldehyde and acetate by the endogenous alcohol dehydrogenase and aldehyde dehydrogenase, respectively. We disclose a hepatocyte-mimicking antidote for alcohol intoxication through the co-delivery of the nanocapsules of alcohol oxidase (AOx), catalase (CAT), and aldehyde dehydrogenase (ALDH) to the liver, where AOx and CAT catalyze the oxidation of alcohol to acetaldehyde, while ALDH catalyzes the oxidation of acetaldehyde to acetate. Administered to alcohol-intoxicated mice, the antidote rapidly accumulates in the liver and enables a significant reduction of the blood alcohol concentration. Moreover, blood acetaldehyde concentration is maintained at an extremely low level, significantly contributing to liver protection. Such an antidote, which can eliminate alcohol and acetaldehyde simultaneously, holds great promise for the treatment of alcohol intoxication and poisoning.

The invention relates to a recombinant pichia pastoris strain regulating expression of glutamine transaminase in Zea mays by using a FLD1 promoter and a construction method thereof. The recombinant pichia pastoris strain is a genetically engineered strain obtained by transferring a transglutaminase gene derived from Zea mays into pichia pastoris, the recombinant pichia pastoris strain is obtainedby replacing an alcohol oxidase promoter PAOX1 in the pPIC9K plasmids to a formaldehyde dehydrogenase promoter PFLD1, and connecting with the glutamine transaminase gene into a loop to form a recombinant expression vector. The recombinant strain is easy to culture has strong secreting capability, is beneficial to the large expression of glutamine transaminase, has the characteristics of safety andreliability, and has important application prospects.