57 results about "D-gluconate" patented technology

The invention provides methods for producing products comprising improved host cells genetically engineered to have uncoupled productive and catabolic pathways. In particular, the present invention provides host cells having a modification in nucleic acid encoding an endogenous enzymatic activity that phosphorylates D-glucose at its 6th carbon and / or a modification of nucleic acid encoding an enzymatic activity that phosphorylates D-gluconate at its 6th carbon. Such improved host cells are used for the production of products, such as, ascorbic acid intermediates. Methods for making and using the improved host cells are provided. Nucleic acid and amino acid sequences for glucokinase and gluconokinase are provided.

The invention discloses a technology for making coated soybean cheese. The technology for making the coated soybean cheese comprises the following three steps of: A) preparing soybean milk; B) making soybean cheese by mixed fermentation; and C) preparing the coated soybean cheese. The soybean milk is obtained by ultrasonic treatment after soybean is thermally pulped. The soybean cheese is obtained by squeezing soybean curd formed under the co-action of inoculated lactic acid bacteria leaven for fermenting and added D-gluconic acid-delta-lactone (GDL). The coated soybean cheese is prepared by using the soybean cheese subjected to limited enzymolysis as a raw material. The coated soybean cheese which is not added with any milk product components has good flavor property, coated property anddeliquescence in mouth.

Bacterial polynucleotides and polypeptides are provided in which the polypeptides have a dehydrogenase activity, such as an alcohol dehydrogenase (ADH) activity, an uronate, a 4-deoxy-L-erythro-5-hexoseulose uronate (DEHU) ((4S,5S)-4,5 dihydroxy-2,6-dioxohexanoate) hydrogenase activity, a 2-keto-3-deoxy-D-gluconate dehydrogenase activity, a D-mannuronate hydrogenase activity, and / or a D-mannnonate dehydrogenase activity. Methods, enzymes, recombinant microorganism, and microbial systems are also provided for converting polysaccharides, such as those derived from biomass, into suitable monosaccharides or oligosaccharides, as well as for converting suitable monosaccharides or oligosaccharides into commodity chemicals, such as biofuels. Commodity chemicals produced by the methods described herein are also provided.

The present invention relates to the effect of naturally occurring compounds on tumor development. As an example of proof, we used low; non-toxic doses of three compound e.g. Calcium D-glucarate, a naturally occurring Ca++ salt of D-glucaric acid; Nicotinamide (NA), a naturally occurring vitamin and butyric acid (BA), a naturally occurring saturated short chain fatty acid. 7,12 dimethylbenzanthracene (DMBA), which is a very potent skin carcinogen and is an environmental pollutant, was used for skin tumor development. Experiment was performed upto 30 weeks. All the above-mentioned compounds were used either alone or concomitantly any two or all the three. In the positive control group 100% tumorigenesis was attained in 28 weeks, use of single compound led to the inhibition of DMBA induced tumorigenesis between 33 to 47%, use of two compounds resulted in the 73 to 80% reduction in tumorigenesis but the concomitant use of three compounds resulted into 100% inhibition of tumor development at the end of 30 weeks. This led us to conclude that the concomitant use of Cag, NA and BA in combination of two is useful for preventing skin tumor develoment for a sort or long period of time. But the concomitant use of all the three compounds, as described, exhibited the perfect synergistic effect in preventing the tumor development completely. This strategy should be equally effective in the management of benign and possibly malignant tumor in any organ caused by any mean.

The invention provides a high-efficiency broad-spectrum food composite preservative and aims to solve the technical problem that most of the food preservatives now used in food processing are potassium sorbate and sodium benzoate, cannot achieve ideal preservation effect when use alone due to certain limitation to antibacterial spectrum and suffers certain limitation on use. The key point of the preservative lies in that the preservative contains nisin, natamycin, potassium sorbate, sodium diacetate and sodium dehydroacetate or also one or all of d-sodium erythorbate and d-glucono-delta-lactone. The use of the preservative is to be added in various foods.

The invention discloses a copper oxidation discoloration resistant agent and a preparation method thereof. Solvent of the copper oxidation discoloration resistant agent is water, one liter of the copper oxidation discoloration resistant agent comprises, by proportion, 4g-8g of benzotriazole, 1g-3g of thiocarbamide, 1g-3g of D-glucose acid sodium, 0.1g-0.3g of surface active agent and 30mL-50mL of organic cosolvent. According to the copper oxidation discoloration resistant agent, no toxic component is included, no toxic waste is discharged to environment in the processes of preparation and application, and thus environmental protection is benefited, the benzotriazole is used as a main component of a molecular self-assembly membrane, meanwhile, corrosion inhibitor thiourea and the D-glucose acid sodium are combined with the copper oxidation discoloration resistant agent to form a hydrophobic adsorption layer on the surface of a copper base material, and thus the copper base material is effectively isolated from outer corrosive environment, and a good copper oxidation discoloration resistant function is achieved.

The invention discloses an environmental long-term pre-treatment process for surface anodization of aluminum alloy. A pre-treatment solution comprises two parts: an alkali etching solution and a brightening liquid, wherein the alkali etching solution is composed of sodium hydroxide and an alkaline etching agent consisting of sodium phosphate, sodium carbonate, D-sodium gluconate, sodium benzoate and sodium dodecanesulphonate; and the brightening liquid is composed of sulfuric acid and sodium molybdate. The technology comprises the following steps: 1, etching by alkali; 2, washing by hot water; 3, washing by cold water; 4, brightening; and 5, washing by the cold water. The alkali etching solution provided by the invention has long using period, is stabile in performance and not easy to produce insoluble aluminum fouling; the brightening liquid does not contain fluorinion and hexavalent chromium, does not emit toxic gases, is green and safe, and meets environmental requirements. The aluminium processed by the pre-treatment method can be directly anodized.

The invention discloses a serratia marcescens strain producing high-purity 2-keto-D-gluconic acid, and belongs to the field of microorganisms. The strain is a serratia marcescens SDSPY-136 strain, is deposited in the China General Microbiological Culture Collection Center in February 9, 2015, and has an accession number of CGMCC No:10548. The strain can adopts glucose and trehalose as carbon sources, cannot ferment arabinos, is free of gas generation during glucose fermentation and is positive to catalase. The strain is used for production of the 2-keto-D-gluconic acid. Production of the 2-keto-D-gluconic acid by the strain is high in glucose conversion ratio and less in by-products, and the obtained 2-keto-D-gluconic acid is high in purity.

The invention discloses a class of flavonoid compound as shown in formula I or an application of a plant extract containing the same in preparing medicine against hepatitis c virus, wherein R1, R2, R4, R5 and R6 are independently H, OH or OMe; R3 is H, OH, OMe or beta-D-gluconic acid; and a single bond or a double bond is arranged between a second carbon and a third carbon. The flavonoid compound has better effects of resisting the hepatitis c virus and less side effects, mostly comes from the traditional Chinese medicine and is cheap, safe and effective. Formula I.

The invention provides a microbial cell conversion method for producing 2-keto-D-gluconic acid. The method comprises the steps of A. preparing resting cells with a genetic engineering strain of gluconobater oxydans DSM2003 as a strain, wherein the genetic engineering strain is gluconobater oxydans of overexpressing gluconic acid dehydrogenase, and the gene of the gluconic acid dehydrogenase comes from the gluconobater oxydans and has a nucleotide sequence as shown by SEQ ID NO:1; B. preparing a conversion liquid containing glucose or gluconic acid, wherein the concentration of the glucose is 200-250g / L, and the concentration of the gluconic acid is 200-300g / L; and C. adding 30-60g / L of resting cells into the conversion liquid for converting so as to obtain the 2-keto-D-gluconic acid. The method has the advantages that the conversion rate is high, the product is single, the separation and purification are simple, the production cost is saved, the cells are easy to recycle and are reusable, and the like.

The invention discloses a method for increasing content and oxidation resistance of nutritional ingredients in mango juice, comprising the following steps: peeling and denucleating mango to obtain mango pulps; mixing and pulping the mango pulps and water at the mass ratio of 1:0.5-5 to prepare and obtain original mango juice; adding color fixative and flavoring agent into the original mango juice, wherein the color fixative is one of sodium ascorbate, iso-ascorbyl sodium, sodium sulfite and D-gluconic acid-delta-lactone, and the flavoring agent is one or more of saccharose, honey and citric acid; subjecting the original mango juice added with the color fixative and the flavoring agent to super high-pressure homogenization treatment and thermal treatment at the same time to obtain the mango juice, wherein the pressure and temperature for the superhigh-pressure homogenization treatment are 150-220MPa and 40-60 DEG C respectively, the flow rate of the superhigh-pressure homogenization treatment is 2.1L / h, the temperature of the thermal treatment is 40-60 degrees centigrade, and the flow rate of the thermal treatment is 2.1L / h. According to the method disclosed by the invention, the content and the oxidation resistance of nutritional ingredients such as vitamin, total phenols, carotene, anthocyanin, mineral substances and the like in mango juice can be increased effectively at the same time that microbes are killed effectively.

The invention discloses a method for indirectly preparing D-sodium erythorbate, belonging to the technical field of biochemical separation synthesis. The method comprises the following steps: by using a Serratia marcescens SDSPY-136 strain fermentation liquid as a raw material, carrying out fermentation liquid pretreatment, methyl 2-keto-D-gluconate reaction and conversion reaction to obtain crude D-sodium erythorbate; and carrying out refinement and purification to obtain the D-sodium erythorbate product. The Serratia marcescens is used as a production strain to obtain the calcium 2-keto-D-gluconate, and multiple impurity removal modes are combined to convert the treatment liquid into the D-sodium erythorbate. The obtained fermentation liquid has the advantages of high 2-keto-D-gluconic acid yield and high conversion rate; the crude D-sodium erythorbate product has high purity and is easy to refine, so the total yield is enhanced; and the method has favorable popularization and application prospects.

The invention discloses a method for producing 2-keto-D-gluconic acid by using a fermentation method, which is used for producing the 2-keto-D-gluconic acid by using Lebsiella pneumoniae with a lost 2,3-butanediol synthetic route as a production strain and glucose as the raw material through controlling a fermentation liquor to be acidic under an aerobic fermentation condition. The method has the following characteristics of relatively high transformation rate, easily-controlled fermentation process and relatively low temperature reducing energy consumption in a fermentation process.

The invention discloses a high-yield co-production method of D-gluconic acid-delta-lactone, mannose and mannitol, which comprises the following steps of: firstly, epimerizing glucose into mannose; separating to obtain a glucose-rich component and a mannose-rich component; adding glucose oxidase into the mannose-rich component to obtain a mixed solution of gluconic acid and glucose mannose; separating the mixed solution to obtain a glucose mannose solution and a gluconic acid solution; further preparing D-gluconic acid-delta-lactone from the gluconic acid solution; further preparing a mannose crystal from the glucose mannose solution; performing a hydrogenation reaction of the mother solution to obtain a mixed solution containing sorbitol and mannitol; and performing crystallization and centrifugal separation to obtain a mannitol crystal. The method disclosed by the invention increases the content of mannose in liquid glucose, reduces the content of oligosaccharide in the liquid glucose, and obtains a new byproduct, namely D-gluconic acid-delta-lactone; and mannitol is produced through hydrogenation of a mother solution after the mannose crystallization, so that the increase of oligosaccharide content caused by repeated separation and concentration of the mother solution is avoided.

The invention discloses a screening method for a high-yield 2-keto-D-gluconic acid Serratieae bacterial strain, and the application of the bacterial strain for producing 2-keto-D-gluconic acid, belonging to the field of biological engineering. The screening method comprises the following steps of: weighing about 0.2 g of soil, adding the soil in 20 ml 0.85% of sterile normal saline, mixing uniformly via shaking, coating the bacterial suspension on a beef extract peptone culture medium with salt concentration of 5%, culturing for 36 hours at 30 DEG C, culturing the bacterial colony of the purplish red pigment in a fermentation medium, then, executing qualitative analysis via a high performance liquid chromatograph by an internal standard method, and identifying the screened bacterial strain on the aspects of morphology, physiology and biochemistry, and molecular biology, so as to get one high-yield 2-keto-D-gluconic acid Serratieae bacterial strain; the invention also discloses a method for producing the 2-keto-D-gluconic acid by the bacterial strain, and yield of the 2-keto-D-gluconic acid produced by fermentation according to the method is 181.2g / L.

The invention discloses a nitrite-free compound type steel bar corrosion inhibitor and relates to the steel bar corrosion inhibitor. The invention provides the nitrite-free compound type steel bar corrosion inhibitor which can prevent steel bars in concrete from being corroded and prevent environmental pollution. The nitrite-free compound type steel bar corrosion inhibitor comprises the following components by weight: 70%-85% of diisooctyl sebacate, 3%-6% of D-sodium gluconate and 12%-27% of zinc sulfate heptahydrate. When the nitrite-free compound type steel bar corrosion inhibitor is sued, 1.5-4.5g of the nitrite-free compound type steel bar corrosion inhibitor is added into per liter of water (the water which is directly used for blending the concrete). The D-sodium gluconate and the zinc sulfate heptahydrate are compounded with the diisooctyl sebacate so as to obtain the nitrite-free compound type steel bar corrosion inhibitor.

The invention discloses a preparation method of almond bean curd. The preparation method comprises steps as follows: step one, selecting and peeling are performed; step two, materials are soaked; step three, the materials are ground into pulp: almonds and soybeans which are soaked well are washed for 1-2 times, a ratio of the almonds to the soybeans is 1:2-1:4, then the almonds and the beans are put into a grinder, water which is 3 times of the dry weight of the mixed material is added, the mixed material is filtered by 100-mesh filter cloth when ground into pulp, and a filtrate is the pulp; step four, filtering is performed: the pulp obtained through grinding is filtered by a 100-mesh nylon sieve and is cooled to the room temperature; step five, precooking is performed: the filtered pulp is heated to 90-95 DEG C and is subjected to heat preservation for 10 min; step six, cooling is performed; step seven: coagulation is performed: 0.15%-0.35% of delta-gluconolactone is added, a ratio of the pulp to water is 1:4-1:8, and the mixture is heated at the coagulation temperature of 80-90 DEG C for 30 min, and vibration is strictly prohibited. According to the preparation method of the almond bean curd, the bitter almonds and the soybeans are taken as main raw materials, d-glucono-delta-lactone is taken as a coagulator, and the almond bean curd with tender texture, smooth surface, pure bean fragrance flavor and special almond flavor is prepared.

The invention provides a preparation method of a glycosyl-functionalized imidazole ionic liquid stationary phase. The method comprises the steps of: firstly preparing activated silica methanol homogenate for standby use; dissolving D-glucolactone and N-(3-amino propyl) imidazole in ethyl alcohol to obtain N-imidazole propyl glucosamide; mixing the N-imidazole propyl glucosamide with 3-isocyanate propyl trimethoxy silane, and dissolving the mixture in ethyl alcohol to obtain N-trimethylsilyl propyl-N'-glucosamide propylimidazole+ iodide ion solution; and then adding the silica homogenate in the solution and heating to obtain an N, N'-trimethoxy propyl glucosamide imidazole ionic liquid bonded silica gel chromatographic stationary phase. The glycosyl-functionalized imidazole ionic liquid stationary phase chromatographic packing material has excellent physical structure of the silica matrix and special chromatographic performance of the functionalized glycosyl, has relatively strong separation performance for biological molecular compounds, and has a stable separation effect; and the chromatographic packing material has the characteristics of organic solvent resistance, acid resistance, high temperature resistance and high separation efficiency.

The invention discloses pseudomonas putida for producing natural L-(+)-tartaric acid by using 5-keto-D-gluconic acid and salt thereof, and a production method of the pseudomonas putida. The pseudomonas putida mutant strain TUST is preserved in the Common Microorganism Center (CGMCC) of the China Microorganism Culture Preservation and Management Committee on May 28th, 2013, the preservation number is CGMCC No.7648. The natural L-(+)-tartaric acid can be produced from the strain by using 5-keto-D-gluconic acid and salt thereof, the fermentation yield of a shake flask is 1.6g / L, which is 12% of an theoretical value, the fermentation strength is 3% per day, the fermentation yield of a fermentation tank is 7.1g / L, which is 24% of the theoretical value, the fermentation strength is 4% per day, the fermentation product is natural L-(+)-tartaric acid, and moreover the production process is simple and less pollution is caused. Due to adoption of the strain and the production method, a novel process is provided for the production of natural L-(+)-tartaric acid in China, and the economic values of the natural L-(+)-tartaric acid are effectively improved.

The invention discloses a process for producing 2-keto-D-gluconic acid by high-concentration fermentation. A microorganism for converting glucose into the 2-keto-D-gluconic acid or salt of the 2-keto-D-gluconic acid is cultured in a fermentation container, as a carbon source in a fermentation culture medium, the glucose is subjected to fermentation culture, and the pH (Potential Of Hydrogen) value before sterilization is 5.5-7.0; and the fermentation culture medium consists of the following substances by massvolume: 10-32% of glucose, 0.1-1% of maize pulp, 1-5% of calcium hydroxide, 0.02-0.08% of de-foaming agent and a solvent as water. The pH value is adjusted by calcium hydroxide in the beginning of fermentation so that the cost is lower, the pH value of a fermentation solution is more accurately adjusted and controlled by liquid ammonia or ammonia water in the mid- to late-period of fermentation so that the fermentation solution is kept in the environment for optimal growth and acid production of the microorganism, and a nitrogen source is supplied at the same time, so that the acid production rate and the acid production concentration of bacteria are increased, the fermentation conversion rate and the yield are increased, the fermentation cycle is shortened, the quality of the fermentation liquid is high, the amount of the impurity is small, the extracting and purifying processes are convenient, and the emission of calcium sulfate waste residues is reduced at the same time; and the formed byproduct is ammonium sulfate which can be used as a fertilizer.

The invention relates to a novel synthesis method for 1-(Beta-D-glucopyranosyl)-4-methyl-3-[5-(4-fluorophenyl)-2-thienylmethyl]benzene (canagliflozin). 2-(4-fluorophenyl)-5-[(5-halogeno-2-methylphenyl)methyl]thiophene and 2,3,4,6-tetrakis-O-(trimethylsilyl)-D-glucono-1,5-lactone are dissolved in organic solvent and carry out condensation reaction under the catalysis of a metallic lithium derivative, and thereby intermediate (II) is produced; the intermediate (II) undergoes catalytic hydrogenation reaction, so that intermediate (III) is further produced, and finally, compound (I), namely the canagliflozin is obtained by acidification hydrolysis. Because the preparation method disclosed by the invention replaces a virulent BF3 / triethyl silicane reduction system with the environment-friendly catalytic hydrogenation technique, the preparation method is technically safer, environment-friendly, low in cost and more suitable for industrial production.

The invention relates to a production method of deplating liquid for concentrated gold coating, which is characterized by adding 100 to 150g of nitro compound, 0.05 to 0.12g of inorganic catalyst, 30 to 50g of KOH, 12 to 20g of D-potassium gluconate and 25 to 50g of potassium citrate into 1 liter of water to prepare the deplating liquid. The deplating liquid prepared according to the method of the invention is free from toxicity and harm, causes small environmental pollution, and can decoat the gold coating fast and efficiently.

Disclosed is a process for producing L-tartaric acid or a salt thereof and / or glycolic acid or a salt thereof from glucose, which comprises the following steps (A) to (C): (A) culturing a microorganism capable of producing 5-keto-D-gluconic acid from glucose in a glucose-containing culture medium in the presence of an alkali capable of producing a water-soluble salt of 5-keto-D-gluconic acid, thereby producing a culture containing a water-soluble salt of 5-keto-D-gluconic acid; (B) adjusting the pH value of the culture containing the water-soluble salt of 5-keto-D-gluconic acid, which has been produced in step (A), to 7 to 12 and retaining the culture at that pH value, thereby producing a reaction solution in which the water-soluble salt of 5-keto-D-gluconic acid is converted into L-tartaric acid or a salt thereof and / or glycolic acid or a salt thereof; and (C) collecting L-tartaric acid or the salt thereof and / or glycolic acid or the salt thereof from the reaction solution which has been produced in step (B).

The invention discloses a preparation method and application of a novel modified organic silicon softening agent, and belongs to the technical field of textile chemical industry. The preparation method comprises the catalyst preparing process and the softening agent preparing process, wherein zinc sulfate and D-sodium gluconate solids are added into 100 ml of water to be mixed to prepare a catalyst solution, polysiloxane, butyl methacrylate and n-butyl acrylate are mixed and stirred, the catalyst solution is added after the temperature is increased, and a temperature increasing reaction is performed to obtain the modified organic silicon softening agent. The invention further discloses application of the organic silicon softening agent in a flax fabric finishing technology. The preparation method is simple, convenient, easy to operate, low in cost and suitable for the large-scale industrialized production requirement; after the novel modified organic silicon softening agent is applied to flax fabric finishing, the good flexibility and wrinkle resistance are given to flax fabric fiber, the smoothness and brightness are also excellent, and the extremely high market promotion value is achieved.

The invention discloses a preparation method of 1-(1-methoxy pyran glucosyl)-4-methyl-3-[5-(4-fluorophenyl)-2-thienyl methyl] benzene. The method comprises the steps of adding tetrahydrofuran, toluene and 2-(5-bromine-2-methyl benzyl)-5-(4-fluorophenyl) thiophene in a reaction kettle, protecting by using N2 gas, cooling, and dropping a n-butyllithium solution; then dropping a toluene solution of 2,3,4,6-tetra-O-trimethylsilyl-D-glucolactone; finally, dropping an acidic methanol solution; adjusting the pH value to be 7-8, adding toluene, stirring, standing, collecting an organic layer, firstly washing the organic layer by using saturated salt water, and then concentrating and drying to obtain remainders; adding toluene into the remainders, heating and dissolving, cooling, then slowly adding n-hexane, stirring, filtering, and drying to obtain a product. The process disclosed by the invention is simple; genotoxic impurities can not be generated in a production process, so that side effects to a human body can be avoided.

The invention discloses a method of extracting tartaric acid by fermenting grape pips, and relates to the technical field of extraction methods. The method comprises the following steps: adding residual grape pips after juicing into tartaric acid fermentation bacteria (dissociants of Gluconoba-cter suboxydans); fermenting for 5-6 days at 30 DEG C; forming tartaric acid by oxygenolysis of glucose by way of 2,5-diketo-D-gluconic acid while forming hydroxyacetic acid, wherein the melting point of tartaric acid is 171-174 DEG C, and the melting point of hydroxyacetic acid is 78-79 DEG C. The tartaric acid is separated and purified according to great disparity of the melting points of tartaric acid and hydroxyacetic acid. The method disclosed by the invention is simple, convenient for actual operation, high in extraction rate and good in product purity, and has good economical benefit.

The invention relates to a preparation method of a canagliflozin intermediate methyl-1-C-(3-((5-(4-fluorophenyl)-2-thienyl)methyl)-4-methylphenyl)-D-glucopyranoside (I). The method comprises the following steps: preparing a Grignard reagent from initial raw materials comprising 2-[(5-halo-2-methylphenyl)methyl]-5-(4-fluorophenyl)thiophene (II) and 2,3,4,6-tetra-O-trimethylsilyl-D-glucolactone (III) and magnesium powder, carrying out nucleophilic substitution, and removing a trimethylsilyl group to obtain the canagliflozin intermediate. Compared with previously reported methods, the preparation method provided by the invention has the advantages of safety, high yield and easy control.

The invention relates to piglet feed and particularly relates to a compound premix for piglet synthetic milk. A piglet synthetic milk additive is prepared by the matching of allicin, lactobacillus, D-sodium gluconate, maltodextrin, procyanidine, orotic acid, methionine, pantothenic acid, ferrous lactate and probiotics. The cost of the raw materials is low; the growth and development of piglets can be rapidly accelerated, and the feed can be effectively saved; the compound premix has sufficient nutrients and the digestion absorption performance of the piglets is improved; the disease-resisting capability and survival rate of the piglets can be improved, and the compound premix can be used for replacing sow milk to feed the piglets.

The invention relates to an electroplated alloy, particularly to an electroplated zinc and copper alloy, which belongs to the metallurgy industry. The electroplated alloy comprises zinc cyanide, coprous cyanide, sodium cyanide, sodium citrate, potassium sodium tartrate and sodium hydroxide. The electroplated alloy is characterized in that D-potassium gluconate, ammonium nitrate, magnesium carbonate (anhydrous) and piperonal(dehyde) are added in the formula; the formula comprises the following components in parts by weight: 39 to 49 parts of zinc cyanide, 4 to 8 parts of coprous cyanide, 20 to 30 parts of sodium cyanide, 20 to 25 parts of sodium citrate, 25 to 35 parts of potassium sodium tartrate, 25 to 35 parts of sodium hydroxide, 40 to 50 parts of D-potassium gluconate, 0.5 to 1.5 parts of ammonium nitrate, 25 to 35 parts of magnesium carbonate (anhydrous) and 1 to 1.5 parts of piperonal(dehyde). The electroplated alloy is mainly used for daily products, such as glass frames, and the like. The electroplated zinc and copper alloy has the advantages of stable plated layer, strong corrosion resistance, long service life and low cost and is convenient in use.