648 results about "Malic acid" patented technology

The invention relates to a whitening and freckle-removing composition containing a composite plant extract and a preparation method of the whitening and freckle-removing composition, and belongs to the technical field of cosmetics. The composition disclosed by the invention is prepared from the following raw materials in parts by weight: 5 to 8 parts of pineapple leaf nano cellulose, 10 to 16 parts of modified starch, 10 to 15 parts of longan seed extract, 6 to 10 parts of mulberry bark extract, 5 to 8 parts of nicotinamide and 8 to 10 parts of hyaluronic acid. The pineapple leaf nanocellulose contains flavonoid and phenolic compounds with double-bond, conjugated double-bond and triple-bond structures, and modified starch is used as a filler to form a film on the surface of skin, so that an anti-ultraviolet protection wall is formed; the betaine-malate ionic liquid is added into the longan seeds, so that extraction of polyphenol in the longan seeds is improved, the longan seeds have acid-base buffering capacity, an auxiliary does not need to be added to adjust the pH value, the components of the prepared composition interact, and the whitening and freckle removing effects are achieved from multiple aspects of ultraviolet resistance, oxidation resistance, inflammation resistance and skin metabolism improvement.

The invention provides a fresh-keeping composite solution sprayed before picking fruits in cold-chain logistics transportation and a preparation method of the fresh-keeping composite solution, and relates to the field of fruit fresh keeping. The fresh-keeping composite solution is prepared from the following raw materials in parts by weight: 2.8 to 3.5 parts of schizochytrium limacinum powder, 2.3 to 2.8 parts of salvia officinalis extract, 1.8 to 2.2 parts of brown algae extract, 1.2 to 1.8 parts of banana peel polysaccharide, 0.8 to 1.2 parts of sodium carboxymethyl cellulose, 0.8 to 1.2 parts of tea polyphenol, 0.8 to 1.2 parts of beta-cyclodextrin, 0.8 to 1.2 parts of sodium alginate, 0.8 to 1.2 parts of calcium chloride, 0.4 to 0.6 part of olive oil, 0.1 to 1 part of malic acid and 80 to 90 parts of water. The composite fresh-keeping solution is developed for cold-chain logistics transportation of fruits and is applied before fruit picking, the synergistic effect of multiple natural components is utilized, sterilization and oxidation resistance can be achieved, the growth of microorganisms can be effectively inhibited, the respiration rate of the fruits is reduced, the moisture of the fruits is kept, and the optimal fresh-keeping effect is achieved. The fruit preservative is sprayed before the fruits are picked, so that decay and quality reduction of the fruits in the cold-chain logistics transportation process can be effectively reduced.

The invention provides a wormwood planting fertilizer and application thereof, and belongs to the technical field of agricultural planting. The wormwood planting fertilizer is prepared from the following components in parts by weight: 10 to 15 parts of humic acid, 5 to 8 parts of amino acid, 2 to 3 parts of wormwood extract A, 3 to 5 parts of wormwood extract B, 15 to 20 parts of nitrogen-phosphorus-potassium compound fertilizer, 0.01 to 0.03 part of sodium selenite, 0.02 to 0.05 part of zinc sulfate, 0.3 to 0.5 part of cellulose nanocrystal, 0.01 to 0.03 part of malic acid and 0.1 to 0.2 part of sodium alginate. By means of the two-dimensional design that components synergistically enhance absorption and the planting process is matched with the growth rhythm, the problems that in traditional fertilization, nutrients are unbalanced, the selenium and zinc utilization rate is low, and pest and disease damage prevention and control are difficult are solved, efficient absorption of wormwood on microelements, accurate supply of nutrients and reduction of the pesticide use amount are achieved, and the yield of the wormwood is increased. The yield and the medicinal quality are synergistically improved.

The invention relates to the technical field of pharmaceutical preparations, in particular to a preparation process of carbon dots for killing helicobacter pylori and application of the carbon dots in oral pharmaceutical preparations. The preparation method comprises the following steps: mixing microcrystalline cellulose and glycerol, freezing and crushing at an ultralow temperature, and selectively hydrolyzing by combining citric acid-malic acid mixed acid liquor to efficiently prepare a high-crystallinity cellulose nanocrystal template; the controllable synthesis of the carbon dots is realized by utilizing the hydrogen-bond interaction of hydroxyl / carboxyl on the surface of the cellulose nanocrystal and the nitrogen doping effect in the polymerization and carbonization process of citric acid and urea. Besides, when a sodium alginate-chitosan double-layer structure is constructed, carbon dots are introduced into the inner layer to endow the inner layer with special performance, a protein-polysaccharide network is formed on the outer layer through transglutaminase enzymatic crosslinking, and the oxidation resistance and mechanical strength are enhanced through secondary curing of tea polyphenol. According to the invention, food-grade raw materials are used for realizing high-efficiency antibiosis, the oral preparation safety specification is met, and the clinical transformation potential is realized.

The invention relates to the technical field of agriculture, in particular to a preparation method and an application method of a zinc-rich cadmium-reducing yield-increasing foliar fertilizer. The specific technical scheme is as follows: the zinc-rich cadmium-reducing yield-increasing foliar fertilizer is prepared from the following components in percentage by mass: 20 to 30 percent of porous chitosan, 30 to 40 percent of L-malic acid and 40 to 50 percent of nano zinc oxide. The technical problem that in the prior art, the zinc content of rice cannot be increased, meanwhile, the rice yield cannot be increased, and the cadmium content of rice cannot be reduced is solved.

A nutraceutical composition, consisting of Nicotinamide Mononucleotide in a range 250-1000 mg, Spermidine in a range 0.5-10 mg, Rhodiola Rosea in a range 200-600 mg, Cacao in a range 1000-10,000 mg, L-Theanine in a range 50-200 mg, Glucosamine in a range 500-3000 mg, and Hyaluronic acid in a range 50-240 mg, or consisting of Epigallocatechin-3-gallate in a range 100-500 mg, Quercetin in a range 250-1000 mg, Resveratrol in a range 150-1000 mg, Sulforaphane in a range 1-50 mg, and Calcium Alphaketoglutarate in a range 300-2000 mg, or consisting of Microdose Lithium in a range 1-5 mg, Trimethylglycine in a range 500-2000 mg, Glutathione in a range 250-1000 mg, Fisetin in a range 100-1000 mg, Urolithin A in a range 250-2000 mg, Sodium Butyrate in a range 100-3000 mg, Berberine in a range 500-1500 mg, Apigenin in a range 50-500 mg, Cinnamon in a range 1000-6000 mg, and Malate in a range 1000-6000 mg.

The invention discloses a liquid treatment agent for red mud harmless treatment and a preparation method thereof.The liquid treatment agent comprises a treatment agent A and a treatment agent B. The treatment agent A is formed by mixing hydrochloric acid and sulfuric acid, and the treatment agent B is prepared from malic acid, acetic acid, phthalic acid monoester, a solvent and an adsorbent, the mass fraction of the malic acid is 20%-40%, the mass fraction of the acetic acid is 20%-40%, the mass fraction of the phthalic acid monoester is 15%-25%, the mass fraction of the solvent is 5%-15%, and the mass fraction of the adsorbent is 5%-15%. The red mud is subjected to primary treatment by using the liquid treatment agent A, and then the red mud subjected to primary treatment is treated again by using the liquid treatment agent B, so that the alkalinity of the red mud can be effectively reduced, and various heavy metals, fluorides, radioactive elements and trace toxic elements in the red mud can be effectively removed; the environment pollution caused by the loss of the harmful substances is avoided, so that the innocent treatment of the red mud is realized.

The invention discloses an elastic powder block type cosmetic product and a preparation method thereof. The elastic powder block cosmetic product comprises a powder component, an oil phase component, a preservative and an antioxidant, the oil phase component comprises an organic silicon elastomer, an ester composition and silicone oil; wherein the organic silicon elastomer is prepared from a polydimethylsiloxane / vinyl polydimethylsiloxane cross-linked polymer; the ester composition comprises isononyl isononanoate and diisostearyl malate, and the mass ratio of isononyl isononanoate to diisostearyl malate is (2: 1)-(3: 1); the silicone oil comprises polydimethylsiloxane; the mass ratio of the organic silicon elastomer to the ester composition is (1: 11)-(1: 13.5). The elastic powder block type cosmetic product is moderate in viscosity, light and thin in texture and good in ductility, stability and makeup maintaining performance.

The invention provides a method for extracting and separating a general flavone crude extract from paeonia lactiflora stems and leaves, which comprises the following steps: adding a choline chloride-malic acid eutectic solvent into paeonia lactiflora stem and leaf powder, soaking, carrying out ultrasonic treatment, carrying out suction filtration to remove solid impurities to obtain a paeonia lactiflora stem and leaf extracting solution, diluting with ultrapure water, carrying out electrodialysis treatment, and drying to obtain the general flavone crude extract. A solid-liquid mixture containing solid residues is obtained in the middle chamber, precipitates are reserved after centrifugation, and the total flavone crude extract is obtained after blow-drying. The invention also provides application of the extracted and separated total flavone crude extract in preparation of medicines, cosmetics or functional foods for antioxidation, anti-inflammation, anti-tumor, cardiovascular protection or / and immunoregulation. The method is high in separation speed, high in separation rate and environment-friendly, flavone loss can be reduced to the maximum extent, and the yield of the total flavone crude extract is 0.27%-0.39%.

The invention relates to the technical field of insulin resistance reversal, in particular to a composition with an insulin resistance reversal component and a preparation method thereof.The composition comprises quercetin, procyanidine, malic acid, magnesium carbonate, zinc lactate and cereals, fasting blood glucose, fasting insulin and an insulin resistance index can be reduced through synergistic interaction of all the components, and the insulin resistance index can be reduced; according to the traditional Chinese medicine composition, the insulin sensitivity index is improved, and the problems that in the prior art, traditional Chinese medicine compositions are complex in component, effective components capable of reversing insulin resistance and the synergistic mechanism are unclear, and the content of the effective components in the same medicine is inconsistent due to the influence of the growth environment, so that the treatment effect is unpredictable are solved.

The invention belongs to the technical field of electrochemical energy storage, and provides a negative electrode electrolyte, a preparation method thereof and a zinc-bromine flow battery. The negative electrode electrolyte comprises the following components: zinc bromide, supporting electrolyte, a negative electrode additive and water, and the negative electrode additive comprises malic acid; and the concentrations of the zinc bromide, the supporting electrolyte and the malic acid in the negative electrode electrolyte are 2.0 to 2.5 mol / L, 2.0 to 3.0 mol / L and 0.02 to 0.04 mol / L respectively. Zinc dendrites and hydrogen evolution reaction are effectively inhibited, and cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is achieved. Therefore, the malic acid is introduced into the negative electrode electrolyte, so that the zinc dendrite and hydrogen evolution reaction in the zinc-bromine flow battery can be effectively inhibited, and the cooperative improvement of coulombic efficiency, voltage efficiency and energy efficiency is realized.

The invention relates to the field of medicinal chemistry, in particular to xanthomeline pamoate, which has a structure as shown in a formula I. The malate of the compound as shown in the formula I has excellent effects in at least one aspect of physical stability, solubility, hygroscopicity, biological activity, safety, bioavailability, toxic and side effects and the like. # imgabs0 #

The invention discloses a bamboo shoot pulp enzymolysis and bamboo shoot composite flavor seasoning egg preparation technology, and belongs to the technical field of seasoning egg preparation. The preparation process is used for solving the technical problem that the flavor and taste of the seasoning eggs need to be further improved in the prior art, and comprises the following steps: soaking pretreated eggs in flavor seasoning juice for 10-12 hours, and performing post-treatment to obtain the flavored seasoning eggs. Bamboo cellulose modification and bamboo shoot enzymolysis technologies are combined, the hydrophilicity and flavor carrying performance of cellulose are improved through oxidation reduction and glycerol and malic acid grafting, sauce forms stable colloid, the seepage force is enhanced, enzymolysis bamboo shoot pulp releases small-molecule flavoring substances, natural fresh fragrance is given, and the flavor of the bamboo shoots is improved by being matched with vacuum and long-time impregnation. The seasoned eggs are elastic and moist in taste and rich in flavor, and the overall quality is remarkably improved.

The invention discloses pichia kudriavzevii for high yield of L-malic acid as well as a construction method and application thereof, and belongs to the technical field of biology, the pichia kudriavzevii is named as YM-023 and classified as Pichia kudriavzevii, the preservation number is CGMCC No. 35487, the preservation time is July 31, 2025, and the preservation number is CGMCC No. 35487. The preservation unit is China General Microbiological Culture Collection Center (CGMCC). The method comprises the following steps: starting from an acid-resistant yeast Kudriavzevii pichia pastoris strain YL-000 (the preservation number is CGMCC No.35680), carrying out metabolic engineering transformation to obtain a transformed strain, and ensuring that the transformed strain can realize efficient production of L-malic acid in a fermentation mode of adding a small amount of calcium carbonate neutralizer.

The invention discloses a medicinal and edible medicine extract, a medicinal composition and a preparation method thereof, and belongs to the technical field of medicinal and edible traditional Chinese medicines. The medicine extract comprises the following raw materials: hovenia dulcis thunb, lalang grass rhizome, lophatherum gracile, corn stigma, emblic leafflower fruit, medlar and pericarpium citri reticulatae. In addition, the invention also provides a preparation method of the medicine extract, which comprises the following steps: mixing the raw materials in proportion, adding 5-6 times of water, decocting twice, filtering and combining filtrate, and concentrating under reduced pressure until the relative density is 1.1-1.2 to obtain the medicine extract. In addition, the invention further provides a pharmaceutical composition which comprises the pharmaceutical extract, fructo-oligosaccharide liquid, corn oligopeptide powder, a freeze-dried complex microbial inoculant, oyster peptide powder and DL-malic acid. The medicinal extract provided by the invention has the advantages that the liver protection effect is also improved while the alcoholism relieving effect is improved.

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to an amino acid water-soluble fertilizer containing chitosan oligosaccharide and salt-tolerant bacillus and a preparation method of the amino acid water-soluble fertilizer. According to the method, litopenaeus vannamei heads are used as raw materials, a refined solution is prepared through mixed acid pretreatment, double-enzyme fermentation and nanofiltration membrane desalination, and the refined solution is mixed with a salt-tolerant domesticated bacillus licheniformis / bacillus natto solution, citric acid-malic acid chelated medium elements and a protective agent. According to the method, by optimizing a pretreatment process and a chelating system, synergistic degradation of shrimp head protein and chitin is achieved, the prepared fertilizer has the compound functions of amino acid, chitosan oligosaccharide and a salt-tolerant microbial agent, the problems that a microbial agent in a traditional fertilizer is poor in salt tolerance and prone to precipitation are solved, and the method is suitable for facility agriculture and saline-alkali soil and has a wide application prospect. The crop stress resistance can be enhanced; the growth effect is improved.

The invention relates to the technical field of polyphenol extraction, and provides a green pear polyphenol extraction method which comprises the following steps: performing steam explosion treatment on pear residue dry powder, and then infiltrating and activating by using an aqueous solution containing L-malic acid; adding betaine and D-gluconic acid into the first part of ultrapure water to prepare a deep eutectic solvent; mixing the eutectic solvent with a second part of ultrapure water to prepare a composite extracting agent; putting the infiltrated and activated raw materials and a composite extracting agent into an extraction device to obtain an extracting solution; carrying out solid-liquid separation on the extracting solution to obtain a clear solution; and adsorbing the clarified liquid through macroporous adsorption resin, then eluting with an ethanol water solution, collecting polyphenol-rich eluent, and carrying out spray drying to obtain the pear polyphenol extract. According to the technical scheme, the quality of an extracted product is improved, and polyphenol oxidation and thermal degradation are reduced; meanwhile, the product storage stability is improved, the phenomena of wall sticking and caking of powder are reduced, and the product yield and physical properties are guaranteed.

The invention relates to the technical field of agriculture, in particular to an iron-rich yield-increasing foliar fertilizer for rice as well as a preparation method and an application method of the iron-rich yield-increasing foliar fertilizer. According to the specific technical scheme, the iron-rich yield-increasing leaf fertilizer for the rice is prepared from, by mass, 15%-25% of porous chitosan, 20%-30% of L-malic acid and 45%-55% of ferrous sulfate. The technical problem that in the prior art, the cadmium content of brown rice cannot be reduced while the iron content cannot be increased through a leaf fertilizer is solved.

The invention discloses a method and a system for recycling a lithium battery material under the assistance of photocatalysis. The method comprises the following steps: (1) mixing lithium battery black powder with malic acid and hydrogen peroxide, and adding a titanium dioxide / graphene composite photocatalyst; (2) carrying out a leaching reaction under ultraviolet irradiation, and releasing metal ions through a photocatalysis-chemical synergistic effect; and (3) separating Fe / Al, Co / Ni and Li components step by step by adopting a multi-stage light-operated gradient precipitation method. The method disclosed by the invention is green and efficient, reduces the dosage of strong acid and oxidizing agent, can recycle the photocatalyst, and has no secondary pollution. According to the method, an ultraviolet light catalysis method is adopted to enhance the leaching efficiency and promote effective precipitation of metal ions, and the energy consumption in the recovery process can be greatly reduced.

The invention provides a novel ionic liquid / waterborne polyurethane composite sizing agent and a preparation method thereof, and belongs to the field of carbon fiber sizing agents. The ionic liquid in the composite sizing agent is composed of L-malic acid and triethylamine and is partially similar to synthetic raw materials of waterborne polyurethane, and the ionic liquid can be tightly combined with the waterborne polyurethane according to the principle of'similar miscibility '. The unique molecular structure of the L-malic acid brings an-OH functional group for the IL, and-OH in the IL participates in the curing ring-opening reaction of the epoxy resin in the heating curing process of the epoxy resin, so that not only is the crosslinking density of the epoxy resin increased, but also a specific molecular chain of the L-malic acid and the triethylamine is connected into a molecular chain of the epoxy resin.

The invention relates to the technical field of agriculture, in particular to a zinc-rich cadmium-reducing leaf surface blocking and controlling agent as well as a preparation method and an application method thereof. According to the specific technical scheme, the zinc-rich cadmium-reducing leaf surface blocking and controlling agent is prepared from, by mass, 10%-20% of gamma-chitosan, 20%-30% of L-malic acid and 50%-70% of zinc sulfate. The technical problem that in the prior art, the cadmium content of brown rice cannot be reduced through a leaf surface blocking and controlling agent is solved.

The invention relates to the technical field of preparation and cyclic utilization of high polymer materials, in particular to a preparation method and application of a bio-based polyurethane material capable of being regenerated in a closed loop mode. And a novel polyurethane system with self-repairing, controllable degradation and efficient regeneration capabilities is constructed. Reversible crosslinking of the material is realized by utilizing the dynamic property of an acetal bond, a citric acid and malic acid buffer solution degradation strategy is combined, so that the waste material can be efficiently decomposed and monomers are recycled, and high-purity recycling of the regenerated prepolymer is realized by virtue of bipolar membrane electrodialysis and membrane separation technologies. The process not only solves the industrial problem that a traditional polyurethane material is difficult to recycle, but also remarkably reduces resource consumption and environmental pollution through closed-loop design, and is suitable for the fields of buildings, electronic packaging, medical equipment and the like with high requirements on sustainable materials.

The invention belongs to the technical field of silicon material cleaning, and particularly relates to a silicon material cleaning agent and a preparation method and application thereof. The silicon material cleaning agent provided by the invention comprises the following components in parts by mass: 50-60 parts of water; 15 to 30 parts of an acidic etching solution; 10 to 20 parts of a first chelating agent; 10 to 20 parts of a second chelating agent; 0.5 to 5 parts of a surfactant; 5 to 15 parts of a builder; wherein the first chelating agent is selected from at least one of 1-hydroxyethylidene-1, 1-diphosphonic acid or ethylenediaminetetraacetic acid; the second chelating agent is selected from at least one of citric acid, gluconic acid, tartaric acid, malic acid, sodium citrate, sodium gluconate, potassium pyrophosphate and sodium pyrophosphate. The silicon material cleaning agent is used for silicon material cleaning, various metal ions can be cleaned at a time, the silicon material cleaning efficiency is improved, and the industrial cost is effectively reduced.

The invention discloses a fertilizer for degrading phosphorus element residues in soil and improving the utilization rate of the fertilizer and a preparation method of the fertilizer. The invention belongs to the technical field of fertilizers, and through dipping treatment and high-temperature calcination of rice husk charcoal and a monopotassium phosphate solution, the surface of the prepared modified charcoal is rich in active functional groups, and the modified charcoal can adsorb and activate insoluble phosphorus in soil, improve the soil structure and enhance the permeability and water retention capacity of the soil at the same time; meanwhile, the phosphate-solubilizing bacillus, the pseudomonas and the arbuscular mycorrhizal fungi are compounded for use, so that the release efficiency of fixed-state phosphorus in the soil can be remarkably improved, and absorption and utilization of phosphorus by crops are promoted; citric acid, malic acid and tartaric acid are compounded for use and can form a stable chelate with metal ions in soil, the fixing effect of the metal ions on phosphorus is reduced, and the effectiveness of phosphorus is further improved; through reasonable trace element proportioning, the fertilizer can meet the requirements of crops on micronutrient elements in the growth process and promote healthy growth of the crops.

The invention relates to the technical field of pharmaceutical compositions, and particularly discloses a proteolipid composite supplement with synergistic hangover alleviating and liver protecting functions and a preparation method thereof. The health-care food comprises the following components in percentage by mass: 10-25% of a Pu'er tea extract, 15-30% of glucose syrup, 5-15% of a hovenia acerba extract, 5-15% of a radix puerariae extract, 8-20% of corn peptide, 5-15% of oyster peptide, 3-10% of earthworm peptide, 1-5% of malic acid, 2-8% of multivitamins, 1-5% of an electrolyte compound, 3-10% of prebiotic fibers and 0.5-3% of gamma-aminobutyric acid. The compound vitamins comprise B1, B2, B6, B12, folic acid and vitamin C; the electrolyte compound is a nanoscale electrolyte compound and is an organic chelate containing potassium, magnesium and zinc; the prebiotic fiber is prepared by compounding galactooligosaccharide and resistant dextrin; through compounding design of active peptide components, plant active ingredients and functional factors, the active peptide improves the activity of key enzymes in ethanol metabolism in a targeted manner, and alcohol decomposition is accelerated.

The invention belongs to the technical field of genetic engineering breeding, and particularly relates to application of an SC8 gene in regulating accumulation of soluble solids in tomato fruits and a breeding method. The SC8 gene provided by the invention plays an important role in tomato saccharic acid metabolism and soluble solid synthesis and accumulation, and plays a role in negative regulation of tomato fruit soluble solid synthesis and accumulation. The SC8 gene is applied to plant genetic engineering breeding, and a new functional site and a new breeding thought are provided for cultivating high-quality flavor tomato varieties. By inhibiting the expression of the SC8 gene, soluble solids and sugar acid metabolites thereof such as cane sugar, fructose, glucose, malic acid and citric acid in the red ripe tomato fruits can be increased, and by enhancing the expression level of the SC8 gene, synthesis and accumulation of the soluble solids in the tomato can be reduced; therefore, the implementation of the invention provides a feasible way for cultivating and producing tomatoes with various flavors and qualities, and plays an important role in improving the economic benefits of the tomato industry.

The invention relates to a 14C urea pharmaceutical composition for helicobacter pylori diagnosis and application of the 14C urea pharmaceutical composition. The 14C urea pharmaceutical composition comprises 14C urea, 12C urea, citric acid, malic acid and mannitol. According to the invention, the 12C urea and the 14C urea are added together, so that the radioactivity can be ensured, the stability of the medicine can be improved, and the auto-radiolysis of 14C can be reduced. Besides, citric acid, malic acid and mannitol have a remarkable synergistic effect in the aspect of improving the radioactive activity and radiochemical purity of the composition, the stability of the 14C urea pharmaceutical composition can be improved, meanwhile, the activity of urease generated by helicobacter pylori can be improved, and the detection sensitivity and detection efficiency are further guaranteed.

The invention discloses a modified aureobasidium pullulans strain based on reduction of malic acid pathway consumption and application of the modified aureobasidium pullulans strain. Gene for coding NADPH dependent malic enzyme and phosphoenolpyruvate carboxykinase in an aureobasidium pullulans genome is directionally knocked out. The transformation blocks a key consumption branch for synthesis and accumulation of the cytoplasmic malic acid, and effectively guides a central carbon metabolic flow to be more efficiently guided to a target product. Experimental results show that the polymalic acid yield and the saccharic acid conversion rate of the double-knockout engineering strain D3N5-delta3617 / deltapepck in fermentation are remarkably improved compared with those of an original strain, and the biomass is also increased. The invention provides a high-performance strain with important application value for industrial efficient fermentation production of polymalic acid.

The application discloses a kind of metal organic framework materials and preparation method and application thereof, belong to chemical separation technical field.The preparation method of metal organic framework material provided in the application includes the following steps: with water and methanol as solvent, with 4,4 '-dipyridyl and malic acid as organic ligand, zinc source is added, and reaction is carried out, in the reaction process, oxygen atom on malic acid is connected with zinc ion on zinc source to form 2D layered network structure, 2D layered network structure is bridged by 4,4 '-dipyridyl to form 3D rigid network framework, after reaction, metal organic framework material is prepared.The metal organic framework prepared by the application has super strong capture effect and large storage space for acetylene molecules, and also has excellent separation effect on acetylene carbon dioxide mixed system, to achieve the purpose of high-purity, high-yield acetylene purification in acetylene carbon dioxide mixture.

The invention belongs to the technical field of natural dyes, and provides a natural coloring agent based on roxburgh rose whole plant components as well as a preparation method and application of the natural coloring agent. The preparation method comprises the following steps: fermenting whole rosa roxburghii plants, residues obtained after juicing or dried fruits used as raw materials for 15-30 days under a pure natural acidic or alkaline condition, and soaking cloth to be dyed into fermentation liquor for 7-30 days, so as to finish dyeing. The acidic condition is provided by malic acid or acetic acid, and the alkaline condition is provided by pure natural salt. The method has the advantages of simple process, mild conditions, no use of any chemical synthesis auxiliary agent, environmental protection and safety. By means of the method, natural cloth such as mulberry silk, cotton and hemp can be dyed, the unprecedented and unique golden yellow color can be dyed, and the method has great market application value.