72 results about "ASCORBIC ACID/ZINC" patented technology

The invention relates to an electrochemical sensor capable of simultaneously detecting dopamine, ascorbic acid and uric acid. The electrochemical sensor comprises a work electrode, a reference electrode, and a counter electrode; wherein the substrate electrode of the work electrode is a glass-carbon electrode, the surface of the work electrode is coated with a composite material of graphene and mesoporous ferroferric oxide, the reference electrode is a saturated calomel electrode (SCE), and the counter electrode is a platinum wire electrode. Under an optimum condition, the electrochemical sensor can achieve the measurement of a single substance in a high concentration of coexisting substances, and can also simultaneously detect dopamine, ascorbic acid and uric acid. The electrochemical sensor not only avoids the phenomenon that the summit potentials of dopamine, ascorbic acid and uric acid overlap with each other, but also improves the sensitivity, repeatability, and stability of the conventional method.

The invention relates to a color developing agent and a preparation method and an application thereof. The color developing agent is prepared by mixing a CoOOH nano sheet suspension with 3, 3', 5,5'-tetramethyl benzidine water solution according to the molar ratio CoOOH nano sheets to 3, 3', 5,5'-tetramethyl benzidine of 2:1. The color developing agent is used for detecting ascorbic acid, and has high sensitivity and low detection limit.

The invention discloses an ascorbic acid phosphorus-free corrosion and scale inhibitor which is applicable for treatment of industrial circulating cooling water. The corrosion and scale inhibitor is prepared by compounding a maleic acid compound, an acrylic acid terpolymer, ascorbic acid, a sulfamic acid compound, a zinc salt, a gluconate and distilled water. The ascorbic acid phosphorus-free corrosion and scale inhibitor provided by the present invention provides good corrosion inhibition and scale inhibition effects for carbon steel equipment. The dosage of the phosphorus-free corrosion and scale inhibitor is 20 mg.L<-1> - 50 mg.L<-1> in the industrial circulating cooling water having an alkalinity less than 400 mg.L<-1>, a hardness less than 500 mg.L<-1>, a pH value less than 8.2, a conductance controlled from 0[mu]s.cm<-1>-2400[mu]s.cm<-1>. A plurality of experiment results show that the corrosion and scale inhibitor provides a annual corrosion rate lower than 0.04 mm.a<-1> and a calcium carbonate inhibition rate higher than 98% for the A3 carbon steel. Advantages of the ascorbic acid phosphorus-free corrosion and scale inhibitor and the preparation method are as follows: the discharged waste water during using the corrosion and scale inhibitor does not provide a eutrophic pollution caused by phosphor for water body; the environment is environment-friendly; agent cost for treating each ton of the water is less than 0.12 yuan; the product preparation process is simple.

Radiopharmaceutical compositions, and related methods, useful for medical imaging are provided. The radiopharmaceutical compositions include one or more radiopharmaceutical compounds, together with a stabilizer comprising ascorbic acid, wherein the pH of said composition is within the range of about 3.5-5.5.

The invention provides a determination reagent for eliminating interference of ascorbic acid (vitamin C, VC) by uricase method and an application method thereof. The reagent disclosed herein comprises liquid double reagents, and has good ascorbic acid interference resistance and excellent stability. According to the invention, a two point terminal method is adopted, and the reagent can be applied in semi / full-automatic biochemistry analyzers; the reagent is prepared by using a specific enzyme, thus the reagent has the characteristics of high sensitivity and strong interference resistance; and by adding the selected stabilizing agent, the reagent has good stability, and the reagent can be stored at 2-8 DEG C (in sealed dark place)for 12 months without influence on the performances. The reagent can be widely applied for diagnosis of acute and chronic nephritis, renal calculus, gout and other kidney diseases and leukemia, multiple myeloma and other diseases caused by excessive metabolism of nucleic acid, health check, general examination of kidney diseases and the like.

The invention relates to ascorbic acid lithium and a preparation method thereof. The preparation method of ascorbic acid lithium comprises the following steps: (1) feeding lithium carbonate and ascorbic acid to a water solution to carry out chemical reaction, so as to generate ascorbic acid lithium; (2) continuing to add ethanol to a reaction solution, and separating out ascorbic acid lithium crystal. The prepared ascorbic acid lithium is soluble in water and is organic lithium, can be applied to the field of medicines or foods, for example, can be used as antioxidant preservatives in foods, condiments or beverage, and can also be used as a good drug for treating mania, bipolar affective disorders of alternating attacks of mania and depression, dissociation-affective disorder, cold bronchitis, asthma, pneumonia, hepatitis, liver cancer and high blood pressure.

The invention discloses a method for producing hydrogen by utilizing ascorbic acid to promote glucose photoelectrocatalytic oxidation based on the field of photoelectric chemical catalytic hydrogen production. A Nano cadmium sulfide modified electrode is used as a photo-anode, the ascorbic acid antioxidant is utilized to promote glucose photoelectrocatalytic oxidation, and a photocatalytic fuel cell with the visible photoelectric conversion efficiency of 5.6% is constructed and used for promoting evolution of hydrogen in a foamed nickel cathode. The method has the advantages of low cost and easy and simple operation, utilizes substances in living organisms as fuels, and greatly reduces the hydrogen evolution overvoltage.

The invention brings forward a living plant ascorbic acid detection method based on a microelectrode biosensor. The method comprises the following steps: S1, forming the microelectrode biosensor by using a microelectrode array which is connected to a signal acquisition module and an electrochemical workstation; S2, testing an ascorbic acid standard solution by using the microelectrode biosensor to obtain a mathematical model on the relation between ascorbic acid concentration and current signals; and S3, inserting the microelectrode biosensor into a living plant to be tested to obtain response of the living plant to an input electric signal, and calculating concentration of ascorbic acid in the living plant sample to be tested according to the mathematical model in the step S2. According to the invention, detection equipment is portable, detection condition is simple, detection can be operated in the field, and continuous detection can be realized.

The invention relates to a method utilizing chitosan to compound hexadecylpyridine bromide to modify a glassy carbon electrode and synchronously determining dopamine and ascorbic acid, which belongs to the electrochemical analysis detection technical field. The invention is mainly to use chitosan to compound hexadecylpyridine bromide to drip on the glassy carbon electrode to modify the glassy carbon electrode to ensure that a layer of even thin-film is formed on the surface of the electrode, and further to improve the stability of the electrode. The preparation method of the compound modified agent obtained by the compounding of the chitosan and the hexadecylpyridine bromide is as follows: firstly, cetylpyridinium bromide water solution with percentage concentration by weight of between 5 and 10mM / L is prepared, then chitosan water solution with percentage concentration by weight of between 0.5 and 1.0 percent is prepared, then the cetylpyridinium bromide water solution and the chitosan water solution are mixed according to certain volume ratio, the volume ratio of the cetylpyridinium bromide water solution and the chitosan water solution is between 1:1 and 3:1, and the composite modified agent can be obtained after the mixture is stirred to fully and evenly mix. The method can be directly used for quick electrochemical determination of dopamine and ascorbic acid, and has the characteristics of quickness, sensitiveness, accuracy, high catalytic property and so on.

The invention discloses a method for simultaneously detecting ascorbic acid, dopamine, uric acid, tryptophan and nitrite.The method is implemented by a three-electrode system sensor with a working electrode, a reference electrode and a counter electrode.The working electrode is made of graphene / tantalum, graphene / boron-doped diamond films and graphene / titanium; the reference electrode can be a saturated calomel electrode or an Ag / AgCl electrode or a mercury / mercurous sulfate electrode; the counter electrode is a platinum sheet electrode.The method includes acquiring working curves by the aid of mixed solution of five to-be-detected materials with different concentrations and differential pulse voltammetry; diluting human serum; adjusting the concentrations until the concentrations are within the ranges of the working curves; comparing peak currents obtained by the aid of the differential pulse voltammetry to the working curves to obtain the concentrations of the five to-be-detected materials in the serum.The method has the advantages that characteristics of the concentrations of the five to-be-detected materials can be quickly simultaneously detected, and the method is high in sensitivity and low in detection limit.

The invention discloses a green and quick preparation method of antibacterial material sodium alginate-ascorbic acid nano-silver. The method includes the following steps that (1) a sodium alginate water solution is prepared; (2) the sodium alginate water solution is heated and magnetically stirred overnight; (3) a silver nitrate solution is dropwise added into the overnight stirred sodium alginatewater solution in accompaniment with vortex treatment; (4) an ascorbic acid solution is dropwise added into the mixture obtained in the step (3) in accompaniment with vortex treatment; (5) ultrasonictreatment is carried out on a mixing system; and (6) the mixing system obtained after ultrasonic treatment is centrifuged, supernate is discarded, washing is carried out, sediment is refrigerated ina refrigerator at the temperature of minus 80 DEG C and subjected to freeze drying through a vacuum freezer dryer at the temperature of minus 40 DEG C, and sodium alginate nano-silver particles are obtained. According to the method, the sodium alginate-ascorbic acid nano-silver material is prepared through ultrasound, quick and green preparation is achieved, and the sodium alginate-ascorbic acid nano-silver material is a fresh-keeping packaging material with high potential and is used for prolonging the practical shelf life of products to be packaged.

The invention belongs to the field of photocatalytic fuel cells, and discloses a bovine-serum-albumin-reinforced ascorbic acid / glucose fuel cell and application thereof. By using a bovine-serum-albumin-sensitized CdS / TiO2 electrode as a photoanode, the bovine serum albumin enhances the photocatalytic oxidation of the ascorbic acid / glucose on the CdS / TiO2 electrode under the excitation of ultraviolet light; and on such basis, the photocatalytic fuel cell is developed, wherein the open-circuit voltage is 0.64V, the maximum power is 6.33 mu W. Cm<-2>, the short-circuit current is 0.126 mA / cm<-2>, and the photoelectric conversion efficiency is 10.7%. By using the serum albumin as the photoinduction redox medium and using the ascorbic acid and glucose in the blood as fuels, the fuel cell has the advantages of low cost, environment friendliness, high photoelectric conversion efficiency, favorable biocompatibility and the like.

The invention belongs to the field of titanium dioxide production and specifically relates to a water washing process for producing titanium dioxide by using a sulfuric acid method which uses ascorbic acid to remove high-valence iron. According to the process, during the process that the ascorbic acid is used for reducing the titanium dioxide, trace amounts of the high-valence iron in metatitanic acid are obtained after first water washing and then subjected to second water washing during the production of the titanium dioxide. According to the water washing process, processes for removing high-valence iron when the titanium dioxide is produced by using sulfuric acid methods are improved, one procedure is used for replacing two procedures of traditional processes, and simultaneously, water consumption for a secondary water washing procedure is greatly reduced due to the fact that a sulfuric acid bleaching procedure is omitted. According to the water washing process for producing the titanium dioxide by using the sulfuric acid method which uses the ascorbic acid to remove the high-valence iron, costs are reduced, discharging quantities of waste acid and waste water are reduced, and the problem that aluminum content in a product is high in titanium dioxide due to the fact that trivalent titanium is used for reduction is successfully solved. The water washing process is wide in process condition requirements, simple in operation, high in efficiencies of washing and removing the iron impurity and good in development prospects and application and popularization values.

The invention discloses a novel method for rapidly detecting ascorbic acid. The novel method is characterized in that a manganese dioxide nano material, o-phenylenediamine and AA are simultaneously mixed, and the detection of AA concentration is realized by detecting of changes of fluorescence intensities of the manganese dioxide nano material and the o-phenylenediamine. The method is very simple,and has strong specificity, good stability and fast detection speed, corresponding kits and test strips can be further developed and researched, and the method can meet the requirements of rapid andaccurate on-site detection, and can be applied to food safety detection, disease detection, bioanalysis, environmental analysis and other fields.

The invention provides a preparation method of a platinum-modified nano porous gold tin / carbon fiber paper composite electrode (Pt@NP-AuSn@Ni@CFP) and an electrochemical detection application of ascorbic acid, uric acid and dopamine. The preparation method comprises the following steps that metal nickel of thin layer is pre-deposited on carbon fiber paper (CFP), and then gold tin alloy film is electrodeposited to obtain AuSn / Ni / CFP composite electrode, then the AuSn / Ni / CFP composite electrode is incompletely dealloyed to obtain a composite electrode NP-AuSn / Ni / CFP, and the composite electrode NP-AuSn / Ni / CFP is replaced to obtain a composite electrode Pt@NP-AuSn@Ni@CFP. According to the invention, the platinum nano material is modified on the nano porous gold tin, so that the electrochemical active area of the electrode is enlarged, and the composite electrode has higher sensitivity, wider detection range and excellent anti-interference performance, and is suitable for research and development of corresponding quick detection instruments.

The invention relates to a preparation method of a 4-hydroxybutyric acid test paper resisting the interference of ascorbic acid and pigments. The method includes: infiltrating a filter paper in a first phase immersion liquid, then conducting hot air drying at 30-50DEG C to obtain an enzyme reagent layer; infiltrating a filter paper in a second phase immersion liquid, then conducting hot air drying at 30-50 DEG C to obtain a color developing agent layer; infiltrating a sponge stick in an anti-ascorbic acid infiltration liquid, performing hot air drying at 40-60DEG C to obtain an anti-ascorbic acid sponge stick; and pressing test paper pieces obtained by cutting the color developing agent layer and the enzyme reagent layer under an upper cover color developing hole and at one end of the anti-ascorbic acid sponge stick in order, thus obtaining the test paper. The method provided by the invention provides a solution to the problems that: existing test papers can only be preserved under refrigeration and is unstable under normal temperature; GHB (gamma-hydroxybutyrate) dehydrogenase and ascorbic acid can undergo cross reaction to make ascorbic acid existing samples undergo false positive reaction, thereby obtaining wrong results; and many beverages have colors in itself, thus interfering detection results and like.

The present invention provides for a formulation manufactured by a process comprising: admixing at least one elastomer with a first dispersant to form a gel; admixing a second dispersant with the gel; and admixing at least one active, such as ascorbic acid, with the gel to form a delivery system with an active in the formulation retains its stability, functionality and aesthetics.

The invention provides a technological system and method for enzymatically synthesizing L-ascorbic acid 2-glucoside. The technological system comprises reaction kettles (1), an enzyme storage tank (2), a storage tank (3), centrifuges (4), a first filter device (5), a first resin column (6), a second resin column (7), a second filter device (8), a falling film concentration device (9) and a third filter device (10). The technological method comprises the steps of enzyme reaction, preparation of the crude product of L-ascorbic acid 2-glucoside and crude product refining. The technological system and the technological method have the technical effects that impurities are effectively removed, thus improving the purity of a finished product; the requirements for equipment are simple; the yield is high, after-treatment is simple to carry out, and the cost is low.

The invention discloses an ascorbic acid electrochemiluminescence determination method. According to the ascorbic acid electrochemiluminescence determination method of a gold nano-cluster probe, the high-quantum-yield gold nano-cluster electrochemiluminescence probe is prepared by a reduction method, a manganese dioxide nano-material serves as an electrochemiluminescence quenching agent, electrochemiluminescence signals are restored by oxidation-reduction reaction of ascorbic acid and manganese dioxide, and the content of the ascorbic acid is measured. Within the concentration range of 1.0*10<-9>-1.0*10<-2>mol / L, the logarithm value of the concentration of the ascorbic acid and the changing value of relative electrochemiluminescence strength have a linear relation, and detection limit is 2.56*10<-10>mol / L. Moreover, the ascorbic acid electrochemiluminescence determination method is simple to operate, high in sensitivity and good in reproducibility and selectivity, and accordingly has agood application prospect.

The invention relates to an electrochemical preparation method for L-ascorbic acid detection.According to the method, a functional magnetic carbon-based polymeric microsphere composite material is prepared, an electrode is modified by utilizing the functional magnetic carbon-based polymeric microsphere composite material, the obtained modified glassy carbon electrode Fe304 / GNS / MPCE / Pt serves as a working electrode, and then the electrochemical behavior of ascorbic acid AA on Fe304 / GNS / MPCE / Pt is observed through cyclic voltammetry so as to detect the concentration of ascorbic acid AA.In the method for L-ascorbic acid detection, the concentration range of AA is from 1*10<-6> mol / L to 1.4*10<-4> mol / L, a good linear relation between the AA concentration and the oxidation peak current is presented, the detection limit is 8.05*10<-7> micromoles / L, and the method has the advantages of high sensitivity, simple operation and broad application prospect.

The invention relates to new application of ascorbic acid, that is, the ascorbic acid has the anti-ageing function by a cell reprogramming mechanism, so as to provide direct and powerful experimental basis and theory basis for the anti-ageing application of the ascorbic acid; therefore, the invention has strong scientificalness and innovativeness and has high development and application value.

The invention provides a method for synchronously detecting L-ascorbic acid, D-ascorbic acid and dehydroascorbic acid in milk powder. According to the method, deoxidized sodium thiosulfate and metaphosphoric acid mixed solution is used as an extracting liquid, active ascorbic acid can be effectively protected, the stability of the ascorbic acid can be improved, light-resistant operation is not required, experimental operation is simple and convenient, and the extract has stable property in 24 hours at low temperature. The chromatographic condition has small damage to a chromatographic column,and the service life of the chromatographic column can be prolonged; a mobile phase is formed by monopotassium phosphate and decyl amine, the resolution can be improved by the concentration of the mobile phase, two geometric isomers can still be effectively separated when the ascorbic acid has relatively high concentration, mutual interference can be avoided, and the content of active ascorbic acid can be accurately detected. The method has the advantages of simple operation, small chemical reagent dosage and good extract stability, has a relative standard deviation of 7.82 percent, can be used for multi-union detection, and has an important meaning for accurately detecting the true content of active ascorbic acid in milk powder.

The present invention provides for a formulation manufactured by a process comprising: admixing at least one elastomer with a first dispersant to form a gel; admixing a second dispersant with the gel; and admixing at least one active, such as ascorbic acid, with the gel to form a delivery system with an active in the formulation retains its stability, functionality and aesthetics.

The invention discloses a method for simultaneously determining content of reduced ascorbic acid, dehydroascorbic acid and total ascorbic acid in fruit. The method comprises the following steps: adding oxalic acid into a fresh fruit to extract the total ascorbic acid; separating extracting solution into two portions; adding copper sulfate into one portion for oxidization, and determining the content of the total ascorbic acid by means of a 2,4-dinitrophenylhydrazine colorimetric method; adding an antioxidant, thiourea into the other portion, and determining the content of the dehydroascorbic acid by means of the 2,4-dinitrophenylhydrazine colorimetric method; oxidizing the reduced ascorbic acid in a test sample into the dehydroascorbic acid by activated carbon, then adding 2,4-dinitrophenylhydrazine to generate red osazone, and performing colorimetric determination at a position of 500nm; deducting the obtained content of the total ascorbic acid from the obtained content of the dehydroascorbic acid before the oxidization to obtain the content of the reduced ascorbic acid. According to method disclosed by the invention, the contents of three different kinds of ascorbic acids in fruits such as apple and pear are determined, a standard curve is stable, a linear scope is 1-10mu. g / mL, and a correlation coefficient reaches 0.99 or more.

The invention provides a detection method of ascorbic acid. The detection method comprises the following steps: Ce(IV) ion can enable 3,3',5,5'-tetramethyl benzidine (TBM) to generate oxidation reaction to produce blue TBM imide; when trace ascorbic acid is added in the Ce(IV) / TMB system, the ascorbic acid generates redox reaction with the TMB imide, so that the blue of the system is shallowed, and the shallowing degree and the concentration of the ascorbic acid are in direct proportion, a linear relation is constructed to realize the detection on the ascorbic acid. Compared with the prior art, the method provided by the invention is simple in operation, can quickly detect the concentration of the ascorbic acid in real time; and the detection limit is low, and can be lowest to 0.08 microns; the detection method has good selectivity and interference resistance.

The invention relates to the technical field of industry engineering, and particularly relates to a treatment method of palmitic acid residues generated in the technological process of ascorbyl palmitate production. The treatment method comprises the following steps: firstly using a solvent for moistening and washing the palmitic acid residues so as remove impurities in the palmitic acid residues, then sequentially carrying out working procedures such as centrifuging, airing, putting ascorbic acids for reaction, purifying, crystallizing and drying, and finally converting the palmitic acid residues to the ascorbyl palmitate, wherein solvent filtrate obtained in the centrifuging working procedure returns to the moistening and washing impurity removal working procedure. The treatment method has the advantages that waste residues generated in a traditional preparation process of the ascorbyl palmitate are treated and prevented from polluting environments on the one hand, useful materials in the waste residues are utilized on the other hand, so that waste is turned into wealth, the yield of products in the ascorbyl palmitate production is increased by above 10%, and the cost is reduced by 10%-20%.