40 results about "Zinc chelate" patented technology

The invention discloses a preparation method of a crocodile hydrolyzed protein zinc skin care product, and relates to the technical field of skin care. The method comprises the following steps: step a, pretreating raw materials: taking fresh crocodile meat and bones, cleaning, mechanically crushing until the particle size is less than 5mm, and adding water according to the ratio of 1: (3-5) to prepare homogenate; step b, performing three-step enzymolysis, namely performing enzymolysis by adopting alkaline protease, flavourzyme and zinc chelating enzyme in sequence; according to the constructed technology of three-step enzymolysis and three-stage membrane separation, accurate preparation of crocodile protein zinc is achieved, and the zinc chelating rate is increased to 90% or above through the gradient effect of alkaline protease, flavourzyme and zinc chelating enzyme and directional release of zinc binding sites and is remarkably higher than that of a traditional single-enzyme hydrolysis technology; meanwhile, a combined purification technology of a ceramic membrane, an ultrafiltration membrane and a nanofiltration membrane is adopted to replace chemical precipitation and organic solvent extraction, so that the completeness of active ingredients is reserved, the risk of environmental pollution is reduced, and the method conforms to the green manufacturing trend of food industry.

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a botanical fulvic acid fertilizer and a preparation method thereof, the technical scheme is that the botanical fulvic acid fertilizer comprises the following components: 35-40% of botanical fulvic acid, 6-8% of a humic acid-amino acid chelated microelement fertilizer, 4-5% of a compound microbial agent, 3-4% of a slow-release coating agent, and 22-25% of a modified charcoal carrier; the plant source fulvic acid purified by molasses fermentation can significantly enhance the nutrient chelating ability; the mobility of iron, zinc and other trace elements chelated by molasses amino acid and fulvic acid in soil is enhanced, and the crop absorption rate is increased; the straw carbon-vermiculite composite carrier adsorbs nutrients and slowly releases the nutrients, so that the potassium leaching loss is reduced by 40%, and the salinization risk is reduced; the straw carbon porous structure loads the microbial inoculum, the vermiculite supplements potassium and magnesium elements, and the survival rate of the microbial inoculum is increased after the microbial inoculum is stored for 6 months at normal temperature.

The invention relates to the technical field of skin care products. The invention aims to provide a split storage type novel skin-brightening skin-care product combined by oligopeptide freeze-dried powder and essence. The split storage type novel skin-brightening skin-care product comprises multiple oligopeptide freeze-dried powder and solvent essence, the multi-oligopeptide freeze-dried powder is prepared from the following raw materials in parts by weight: 90 to 95 parts of water, 1 to 2 parts of glutathione, 1 to 2 parts of mannitol, 1 to 2 parts of carnosine, 0.5 to 1 part of ergothioneine, 0.5 to 1 part of vitamin C and 0.0005 to 0.001 part of a multi-peptide-zinc chelate. The multi-peptide-zinc chelate is prepared from the following raw materials in parts by weight: 1-2 parts of hexapeptide-2, 1-2 parts of nonapeptide-1, 1-2 parts of dipeptide-2, 1-2 parts of tripeptide-10 and 2-3 parts of zinc oxide. According to the invention, various peptides with small molecular weights are chelated with zinc, the characteristics of good permeability and strong skin affinity of the small molecular peptides are fully played, the effects of zinc and other components are effectively played, and the overall use effect is greatly improved. Through compounding of multiple components, the moisturizing and brightening mask has multiple effects of moisturizing, good permeability, whitening, brightening and the like.

The invention belongs to the technical field of bioactive peptide preparation and food processing, and discloses an ultrasonic-assisted preparation method of giant salamander muscle peptide zinc chelate. The preparation method comprises the following steps: pretreating giant salamander muscles; preparing giant salamander muscle polypeptide; preparing a chelate product of giant salamander muscle peptide and zinc sulfate heptahydrate under an ultrasonic condition; and carrying out alcohol precipitation separation on a chelation reaction product. The giant salamander muscle peptide zinc chelate prepared by the invention can be directly used as a natural nutrition enhancer to timely supplement nutritional ingredients necessary for a human body. The preparation method provided by the invention has the advantages of short production cycle and no pollution to the environment, and the obtained product has stable performance and high absorption efficiency and can be widely applied to the fields of foods, medicines and health care.

This invention belongs to the field of food processing technology, specifically providing a method for preparing antioxidant zinc chelate peptides, comprising the following steps: inoculating a protein solution with a compound microbial agent for fermentation; the compound microbial agent includes *Lactobacillus plantarum* and *Saccharomyces cerevisiae*; after enzymatic hydrolysis and debittering of the fermentation broth, the antioxidant peptides are separated and dried to obtain the antioxidant peptides; the antioxidant peptides are dissolved in water to prepare a peptide solution, and a zinc source is added to the peptide solution to carry out a chelation reaction; the supernatant is collected, and the precipitate is collected by alcohol precipitation to obtain the antioxidant zinc chelate peptides. This method uses low molecular weight peptides prepared by dual-microbial synergistic multi-enzyme hydrolysis as chelating ligands, which chelate with zinc ions under mild conditions to maximize the preservation of biological activity, achieving a dual enhancement of chelation capacity and antioxidant activity, and achieving a unity of high chelation rate, high antioxidant activity, high stability and good flavor. The process is green, safe, and leaves no organic solvent residue, making it suitable for large-scale industrial production.

The invention discloses a mussel polypeptide-zinc chelate as well as a preparation method and application thereof. The mussel polypeptide-zinc chelate is obtained by chelating mussel polypeptide of which the molecular weight is less than 3kDa and a zinc element; wherein the zinc element is derived from a water-soluble zinc salt; the mass ratio of the mussel polypeptide to the zinc element is (5.5-6.5): 1. The mussel polypeptide-zinc chelate provided by the invention can be used for wound repair. According to the preparation method disclosed by the invention, the mussel polypeptide-zinc chelate with relatively high zinc chelating rate and chelate yield can be obtained.

The invention discloses a lutein composition for relieving asthenopia and a preparation method of the lutein composition, and belongs to the field of functional foods. Phycocyanin and kelp polyphenol are mixed and react to obtain modified phycocyanin; fucoidin and beta-glucuronidase are mixed and react to obtain modified fucose; mixing the fish collagen peptide and zinc chloride to react to obtain a collagen peptide-zinc chelate; the xanthophyll siliceous cage compound and the modified phycocyanin are mixed and react to obtain a first compound; mixing and reacting the first compound and modified fucose to obtain a second compound; mixing and reacting the second compound, collagen peptide-zinc chelate and krill oil to obtain a lutein compound; mixing and reacting the second compound, collagen peptide-zinc chelate and krill oil, adding trehalose, and mixing and reacting to obtain a xanthophyll compound; and mixing the xanthophyll compound and maltodextrin to obtain the xanthophyll composition.

The invention relates to platycodon grandiflorum polysaccharide as well as a preparation method and application thereof. The structural formula of the platycodon grandiflorum polysaccharide is shown in the specification. The preparation method of the platycodon grandiflorum polysaccharide comprises the following steps: extracting platycodon grandiflorum crude polysaccharide from degreased platycodon grandiflorum by adopting a water extraction and alcohol precipitation method, and then decoloring, deproteinizing and purifying to obtain the platycodon grandiflorum polysaccharide PGP. And further preparing a platycodon grandiflorum polysaccharide calcium chelate and a platycodon grandiflorum polysaccharide zinc chelate by utilizing the platycodon grandiflorum polysaccharide PGP. Experiments prove that the prepared platycodon grandiflorum polysaccharide calcium chelate has an anti-osteoporosis effect, and the platycodon grandiflorum polysaccharide zinc chelate has immunoregulatory activity and a probiotic effect of synchronously regulating intestinal microecology. The platycodon grandiflorum polysaccharide calcium / zinc chelate provided by the invention is beneficial to development and application of novel calcium / zinc supplementation agents.

The invention discloses a hot-pressed peanut meal source peptide zinc chelate as well as a preparation method and application thereof, belongs to the technical field of plant extraction, and discloses a hot-pressed peanut meal source zinc chelating peptide and a peanut peptide zinc chelate prepared from the hot-pressed peanut meal source zinc chelating peptide. According to the method, the peanut protein is extracted from the hot-pressed peanut meal from which the residual oil is removed through an alkali-solution and acid-isolation method, the peanut protein is subjected to enzymolysis, the peanut zinc chelating peptide is obtained, the peanut peptide zinc chelate is further prepared, the chelating rate of the finally obtained chelate can reach 62.89%, the structure of the zinc chelating peptide in the hot-pressed peanut meal and the zinc chelating characteristic of the zinc chelating peptide are fully utilized, and the yield of the peanut peptide zinc chelate is improved. The application problem of the peanut meal is solved, the additional value of the peanut meal is improved, and the obtained peanut peptide zinc chelate not only supplements the nutritional ingredients of the peanut peptide, but also supplements the zinc element required by the human body, and has good development and application prospects.

The present invention relates to the field of polypeptide compositions, and specifically relates to a polypeptide metal chelate and the use thereof in the field of cosmetics. The polypeptide metal chelate is formed by means of the chelation of a polypeptide compound with a metal ion compound. A structure of the polypeptide compound is: [γ-Glu]n-AA, wherein n≥1, and AA is selected from glycine, alanine, valine, leucine, isoleucine, methionine (Met), proline, tryptophan, serine, tyrosine, cysteine, phenylalanine, asparagine, glutamine, threonine, aspartic acid, glutamic acid, lysine, arginine or histidine. The polypeptide zinc chelate prepared by the present invention has significant oil-controlling and anti-inflammatory effects, and can be compounded with other raw materials to prepare cosmetics with oil control and acne removal effects.

The present application relates to a kind of zinc ion battery electrolyte containing polysaccharide zinc chelate and preparation method and application, the electrolyte includes deionized water solvent, soluble zinc salt solute and polysaccharide zinc chelate additive, the addition amount of the polysaccharide zinc chelate additive is 0.20 mmol / L~1.35 mmol / L;The polysaccharide zinc chelate additive is any one or multiple of zinc hyaluronate, zinc tannate, zinc alginic polysaccharide, rice bran polysaccharide zinc chelate, zinc chelate of radix mori polysaccharide.In the zinc salt aqueous electrolyte, a trace of green and safe polysaccharide zinc chelate additive is added, on the one hand, hydrogen evolution side reaction is effectively inhibited, on the other hand, the growth of negative electrode surface dendrite is inhibited;The electrolyte is applied to aqueous zinc ion battery, can significantly improve the cycle stability of battery, effectively prolong the cycle life of zinc ion battery.

The invention discloses a method for synthesizing a natural peptide zinc / calcium chelate based on a microwave catalysis technology, and the method comprises the following steps: S1, preparing a natural peptide into an aqueous solution, adding a zinc salt or a calcium salt into the aqueous solution, adjusting the pH value of the system, and transferring the system into a microwave reactor for reaction; and S2, after the reaction, continuously adding absolute ethyl alcohol into the reaction system, and then carrying out ice bath and centrifugation to obtain the natural peptide zinc chelate or natural peptide calcium chelate with the chelation rate not lower than 60%. According to the method disclosed by the invention, the conformation of the natural peptide is opened and changed into an open chain structure by innovatively using a microwave technology, so that the zinc / calcium ions are favorably combined with chelation sites on a peptide chain, and after a chelation reaction is finished, the conformation is recovered by utilizing ice-bath cooling, so that the zinc / calcium ions are wrapped in the middle of the peptide chain, and the zinc / calcium peptide is obtained. Competitive antagonism of metal (zinc / calcium) ions during intestinal absorption is avoided, a plurality of biochemical processes are reduced, and the zinc / calcium absorption rate of a human body is improved.

The invention provides a novel hermetia illucens larva peptide zinc chelate and a preparation method and application thereof, and belongs to the technical field of food and medicines.The preparation method comprises the following steps that hermetia illucens larva protein is subjected to enzymolysis through protease, and hermetia illucens larva peptide with the molecular weight being 900-2000 Da is obtained; after the hermetia illucens larva peptide is mixed with a zinc source, the pH is adjusted to 4.0-7.0, a chelation reaction is induced, and the novel hermetia illucens larva peptide zinc chelate is obtained. According to the method, efficient chelating of peptide zinc of the hermetia illucens larvae is achieved through directional enzymolysis and pH induction, a specific molecular weight peptide fragment (900-2000 Da) is obtained through directional enzymolysis, and the selectivity and efficiency of zinc chelating are improved. When the pH is 4.0-7.0, the reaction conditions are optimized by inducing chelation, and the chelation rate can reach 65%-85%. The binding site analysis proves that the zinc is coordinated with carboxyl and amino in the peptide, and the scientificity of the product is enhanced. Stability research shows that the product keeps stable under a wide range of conditions and is suitable for food and nourishment.

The invention provides a method for determining cysteamine chelated zinc in premixed feed, and belongs to the technical field of analysis and detection. The invention provides a method for determining cysteamine chelated zinc in premixed feed, which comprises the following steps: preparing a cysteamine chelated zinc sample to obtain a near-infrared analysis and prediction sample set; performing first near-infrared analysis on the near-infrared analysis prediction sample set, and obtaining a calibration model according to obtained data; performing second near-infrared analysis on the premixed feed to obtain data of the sample to be detected; the premixed feed contains cysteamine chelated zinc; and obtaining the content of cysteamine chelated zinc in the premixed feed according to the data of the sample to be detected and the calibration model. The determination method provided by the invention has the advantages of no damage, high efficiency, low cost, environmental protection and accurate result.

The invention relates to the technical field of fertilizers, in particular to a production process of a granular bio-organic fertilizer. Comprising the following raw materials in parts by weight: 30-50 parts of animal dung, 10-20 parts of a plant protein source, 5-10 parts of humic acid, 0.5-2 parts of a microbial agent, 5-10 parts of an aluminum-zinc chelated amino acid compound, 3-8 parts of a polypeptide compound nutrient, 5-10 parts of diatomite, 2-5 parts of a flame retardant and 0.5-1 part of sodium lignin sulfonate. According to the invention, the particles have excellent mechanical pressure resistance, so that the organic fertilizer is not easy to break in the storage process, the problem of nutrient loss caused by loose structure of the traditional organic fertilizer is avoided, the fertilizer is ensured to keep complete physical form in the long-term storage and transportation process, and a basic guarantee is provided for large-scale application; the microbial activity improvement, pollution emission reduction and soil nutrient balance are considered, and the ecological safety and sustainability of fertilizer application are realized.

The invention belongs to the technical field of catalysts, and particularly relates to a preparation method of a catalytic cracking reaction composite metal catalyst and application of the catalytic cracking reaction composite metal catalyst in preparation of vinylidene chloride, and the preparation method of the catalytic cracking reaction composite metal catalyst comprises the following steps: (1) mixing a chitosan solution and an acetic acid solution, adjusting the pH value to obtain a mixed solution, adding the zinc lactate solution into the mixed solution, and uniformly mixing to obtain a zinc chelate solution; (2) mixing the zinc chelate solution, an aluminum-containing compound, a silicon-containing compound and a template agent to form slurry, performing spray granulation to form molecular sieve particles, and performing crystallization, washing and drying to obtain zinc-containing molecular sieve microspheres; (3) mixing cesium sulfate, oleic acid and octadecene for reaction to obtain a cesium oleate solution; and (4) dispersing the zinc-containing molecular sieve microspheres into a cesium oleate solution for reaction to obtain the composite metal catalyst for catalytic cracking reaction. According to the preparation process, the process conditions are optimized, and a perfect catalytic system is formed.

A composition of Prunella vulgaris extract and polypeptide zinc chelate, and the use thereof in the field of cosmetics. The Prunella vulgaris extract has a saponin content of not less than 1.5 mg / mL and a flavonoid content of not less than 1.0 mg / mL. The polypeptide zinc chelate is formed by means of the chelation of a polypeptide compound [γ-Glu] n-AA with a zinc ion compound. Cosmetics containing the composition of Prunella vulgaris extract and polypeptide zinc chelate can be used for skin oil control and acne removal.

The invention discloses a ginkgo peptide zinc chelate with a dietary fiber adsorption resisting effect and a preparation method of the ginkgo peptide zinc chelate, and belongs to the technical field of deep processing of forest products. The gingko peptide zinc chelate is prepared by carrying out coordination reaction on gingko peptide and zinc sulfate under specific conditions, and after the gingko peptide zinc chelate is chelated with the gingko peptide, the stability of zinc ions in a digestion environment is remarkably improved, and the precipitation phenomenon of the zinc ions in gastrointestinal tracts is effectively inhibited; the technical defects that a traditional inorganic zinc preparation is high in gastrointestinal irritation, low in bioavailability and the like are overcome. Meanwhile, the ginkgo peptide zinc chelate disclosed by the invention has excellent dietary fiber adsorption resistance, and the bioavailability of zinc can be remarkably enhanced. Therefore, the ginkgo peptide zinc chelate provided by the invention can be widely applied to the fields of special dietary foods, functional health foods, nutrition fortified foods and the like, and has a good application prospect.

The present application belongs to the technical field of catalysts, and particularly relates to a preparation method of a catalytic cracking reaction composite metal catalyst and application thereof in preparation of vinylidene chloride, the preparation method of the catalytic cracking reaction composite metal catalyst comprising the following steps: (1) mixing a chitosan solution with an acetic acid solution, adjusting pH to obtain a mixed solution, and then adding a zinc lactate solution into the mixed solution and mixing uniformly to obtain a zinc chelate solution; (2) mixing the zinc chelate solution, an aluminum-containing compound, a silicon-containing compound and a template agent to form a slurry, forming molecular sieve particles through spray granulation, crystallizing, washing and drying to obtain zinc-containing molecular sieve microspheres; (3) mixing cesium sulfate, oleic acid and octadecene to obtain a cesium oleate solution through a mixing reaction; and (4) dispersing the zinc-containing molecular sieve microspheres into the cesium oleate solution to react, and obtaining the catalytic cracking reaction composite metal catalyst. The present application optimizes process conditions in the preparation process, and forms a perfect catalytic system.

This invention discloses a lutein composition for relieving eye fatigue and its preparation method, belonging to the field of functional foods. The process involves: reacting phycocyanin and kelp polyphenols to obtain modified phycocyanin; reacting fucoidan and β-glucuronidase to obtain modified fucose; reacting fish collagen peptides and zinc chloride to obtain collagen peptide-zinc chelate; reacting lutein silica cage complex and modified phycocyanin to obtain a first complex; reacting the first complex and modified fucose to obtain a second complex; reacting the second complex, collagen peptide-zinc chelate, and krill oil to obtain a lutein complex; reacting the second complex, collagen peptide-zinc chelate, and krill oil, then adding trehalose to obtain the lutein complex; and finally mixing the lutein complex with maltodextrin to obtain the lutein composition.

This invention relates to the field of functional food processing technology, and discloses a method for preparing and applying corn peptides that lower blood pressure. First, microwave pretreatment is used to improve the dissolution rate of corn protein. Then, dynamic temperature-controlled synergistic enzymatic hydrolysis combined with time-segmented microwave assistance is used to directionally release hydrophobic ACE-inhibiting peptides. Surface-modified magnetic materials are used to perform biomimetic affinity adsorption and magnetic separation purification of the target peptides, achieving highly selective enrichment of active ingredients. Finally, the peptides are compounded with stabilizers such as tea polyphenol-zinc chelate and Monascus purpureus extract to form a charge-matched micelle protection system. Through dynamic temperature-controlled synergistic enzymatic hydrolysis and biomimetic magnetic separation processes, efficient release and functional enhancement of active peptides are achieved, simultaneously improving ACE inhibitory activity and storage stability. The charge-matching of stabilizers and the synergistic design of components overcome the absorption barrier of active peptides. A multi-pathway regulatory system is constructed, integrating "blood pressure lowering, lipid lowering, and antioxidant" functions. Experiments have demonstrated that this application has a blood pressure lowering effect.

The invention relates to the technical field of animal husbandry and veterinary feed, and discloses a feed additive for improving sow PSY and a preparation method thereof.The feed additive is prepared from, by mass, 40%-50% of functional amino acid compounds, 20%-30% of slow-release fatty acid microcapsules, 5%-10% of melatonin-zinc chelates and 15%-25% of synergistic auxiliaries; the functional amino acid compound is formed by compounding 5%-8% of L-tryptophan, 10%-15% of L-arginine, 8%-12% of L-histidine and 15%-20% of L-glutamic acid according to the mass ratio of (5-8): (10-15): (8-12): (15-20), and the purity of each amino acid is greater than or equal to 98%; the core of the sustained-release fatty acid microcapsule is 8%-12% of conjugated linoleic acid and 12%-18% of omega-3 polyunsaturated fatty acid, the wall materials are 5%-8% of modified starch and 3%-5% of sodium caseinate, the particle size of the microcapsule is 20-50 microns, the 2-hour gastric acid environment release rate is smaller than or equal to 30%, and the 8-hour intestinal environment accumulative release rate is larger than or equal to 85%. According to the invention, the cooperative design of the functional amino acid compound and the slow-release fatty acid microcapsules is adopted, so that the reproductive performance of sows and the development of piglets are comprehensively improved.

An oral anti-aging combination based on the triple interaction of NAD + -SIRT1-GH, characterized in that it comprises the following components: NAD + -Precursor, resveratrol or an esveratrol-containing reagent, astaxanthin, grape seed extract, vitamin C, L-citrulline, L-ornithine, hydrolyzed collagen, hydrolyzed type II collagen, a zinc chelate and sodium hyaluronate.

The invention belongs to the technical field of bioactive peptide preparation and food processing, and particularly relates to a giant salamander muscle peptide zinc chelate cranberry juice beverage and a preparation method thereof. Giant salamander peptide is extracted from giant salamander muscle, zinc ions are introduced for chelation, the giant salamander muscle peptide zinc chelate is prepared, finally, the giant salamander muscle peptide zinc chelate is compounded with cranberry juice, and then the giant salamander muscle peptide zinc chelate cranberry juice beverage is developed. Compared with a common fruit juice beverage or a single peptide functional beverage, the giant salamander muscle peptide zinc chelate cranberry juice beverage prepared by the preparation method disclosed by the invention is rich in nutritional value, unique in flavor and mouth feel, green and healthy in formula and wide in product application scene, the chelate is high in stability in a beverage system, and the retention rate of zinc is high after high-temperature sterilization and normal-temperature storage; and the product has stable quality in the shelf life, and is suitable for large-scale industrial production.

The invention discloses a preparation method of a small peptide zinc feed additive for improving immunity of broiler chickens, and relates to the technical field of feed additives.The method comprises the steps that soybean protein isolate and casein are mixed and then subjected to primary enzymolysis through pepsin, and then synergistic enzymolysis is conducted through neutral protease and flavourzyme; and carrying out ultrafiltration to obtain a small peptide component with the molecular weight of less than 1000 Daltons, chelating the small peptide component with zinc sulfate heptahydrate according to a molar ratio of 1: 2, carrying out spray drying to obtain a finished product, finally carrying out quality detection on the finished product, and carrying out sealing and dark preservation to obtain a qualified product. The invention aims to solve the problems of uncontrollable immune active components, insufficient efficacy verification and non-environment-friendly process in the existing feed additive, and can directionally enrich Arg-Gly-Asp, Lys-Pro and other immune active peptide fragments to form a high-stability small peptide zinc chelate, significantly improve the antibody titer, serum IgG level and intestinal barrier function of the broiler Newcastle disease, and improve the immunity of the broiler Newcastle disease. Meanwhile, the process is clean, low in cost and suitable for industrial production.

The invention relates to the technical field of composite materials, and discloses a copper-zinc chelated composite material, a preparation method thereof and an application of the copper-zinc chelated composite material in a feed. The preparation method comprises the following steps: modifying rice bran meal by adopting physical and chemical methods to obtain modified rice bran meal; further modifying the composition of the rice bran meal by adopting a biological enzymolysis method to obtain functionalized rice bran meal; reacting copper sulfate and zinc sulfate with glycine and calcium carbonate, ending the reaction when no bubbles are generated in the system, and centrifuging to obtain a copper ion solution and a zinc ion solution; and mixing the functionalized rice bran meal with a copper ion solution and a zinc ion solution, adding a lactic acid bacteria solution for fermentation, and after the reaction is finished, obtaining the efficient copper-zinc chelating composite material. The high-efficiency copper-zinc chelated composite material can be used as a trace element supplement in a feed.

The invention relates to an additive of a charge generation material in an organic photoconductor and the organic photoconductor, and belongs to the technical field of organic photoconductors. Aiming at the technical problems that Y crystal form titanyl phthalocyanine serving as a charge generation material in a charge generation layer in an organic photoconductor is large in dark attenuation and low in sensitivity in a high-temperature and high-humidity environment, bottom ash of a printed product is caused, and printing is light, a fluorine-containing polyurethane-acrylate copolymer and a benzotriazole-zinc chelate are added as additives; the weather resistance of the organic photoconductor is improved, so that the organic photoconductor keeps good performance in a high-temperature and high-humidity environment; the structural formula of the fluorine-containing polyurethane-acrylate copolymer is as shown in the following formula (I); in the formula (I), Rf is a perfluorinated linear alkyl group, and the values of m, n and k are all integers.

The invention relates to the technical field of bioactive peptide preparation and food processing, and particularly provides giant salamander peptide and zinc chelating peptide as well as a preparation method and application thereof. The technical problems that the deep processing level of existing giant salamanders is low, the bioavailability of traditional zinc supplements is low, and existing cranberry juice is single in nutrition function are solved. The giant salamander peptide is extracted from giant salamander muscles, and the zinc chelating peptide is prepared from the following raw materials in parts by mass: 1-5 parts of giant salamander peptide and 1 part of zinc sulfate heptahydrate. According to the invention, the giant salamander peptide and zinc sulfate heptahydrate are subjected to chelation reaction according to the proportion to prepare the zinc chelating peptide, and the zinc chelating peptide is applied to cranberry juice. According to the method, the deep processing way of the giant salamander raw materials is effectively expanded, the market category of giant salamander related high-added-value products is enriched, the nutritional quality of the cranberry beverage can be remarkably improved, the content of flavones and total phenols in the beverage is effectively increased, the requirements of consumers for healthy functional foods are met, and the method has wide application prospects and market value.

The application discloses a casein peptide-zinc chelate TEDELQDKIHP-Zn for promoting zinc absorption, and an amino acid sequence of a polypeptide part of the casein peptide-zinc chelate is Thr-Glu-Asp-Glu-Leu-Gln-Asp-Lys-Ile-His-Pro; and a polypeptide and zinc chelate have a chelate ratio of 1:0.7. The casein peptide-zinc chelate TEDELQDKIHP-Zn has high gastrointestinal digestion stability, good absorption performance, and an effect of promoting zinc absorption is obviously better than that of traditional zinc supplements, such as zinc sulfate and zinc gluconate. The casein peptide-zinc chelate has very important significance for developing food, health products and medicines with a zinc supplement function.