63 results about "Algal polysaccharides" patented technology

The invention relates to the field of microorganisms, and discloses a complex microbial inoculant for preventing and treating clubroot of rape. Comprising the following raw materials in parts by weight: 10 to 12 parts of acid-resistant bacillus, 12 to 15 parts of pseudomonas fluorescens PF-5, 8 to 10 parts of bacillus mucilaginosus, 5 to 7 parts of halophilic bacillus, 8 to 10 parts of bacillus amyloliquefaciens, 12 to 15 parts of trichoderma atroviride ReTv2, 6 to 8 parts of azotobacter chroococcum, 10 to 12 parts of chitosan-gamma-polyglutamic acid microspheres, 12 to 15 parts of diatomite and 8 to 12 parts of humic acid. And 2-4 parts of algal polysaccharides. The living space of plasmodiophora brassicae is preempted by the acid-resistant bacillus; the pseudomonas fluorescens PF-5 directly strikes pathogenic bacteria and stimulates the defense system of the oilseed rape; the bacillus amyloliquefaciens releases a plurality of antibacterial substances; the trichoderma atroviride ReTv2 rapidly destroys the structure of the plasmodiophora brassicae in a manner of hyperparasitism and exoenzyme secretion.

The invention discloses a microbial compound feed for improving disease resistance of blue crabs and a preparation method of the microbial compound feed, and belongs to the technical field of feed preparation. The microbial compound feed comprises the following raw materials in parts by weight: 30-40 parts of fermented soybean meal, 20-25 parts of bran, 15-20 parts of fish meal, 5-8 parts of a compound microbial agent, 3-5 parts of algal polysaccharides, 2-3 parts of a radix astragali extract, 1-2 parts of chitosan, 2-3 parts of a mineral premix and 1-1.5 parts of compound vitamins, wherein the compound microbial agent comprises bacillus licheniformis, lactobacillus acidophilus and saccharomyces cerevisiae. The microbial compound feed disclosed by the invention comprehensively improves the disease resistance of the blue crabs and improves the survival rate through various ways, such as nutrition balance, immune regulation and intestinal health improvement, so that the breeding cost is reduced, and the income of farmers is increased.

The invention provides an edible fungus culture medium and a preparation method, and relates to the technical field of edible fungus cultivation, and the edible fungus culture medium comprises the following components by mass: 10-20 parts of a seaweed polysaccharide matrix, 5-15 parts of insect protein powder, 15-25 parts of biological carbon fiber, 10-20 parts of corncob powder, 0.5-2 parts of a natural silicon source, a proper amount of a trace element solution, and a proper amount of water. The algal polysaccharide matrix is obtained by extracting algal polysaccharides, including algin or alginic acid, from algae in hot water, the insect protein powder is prepared by drying, crushing and carrying out enzymolysis on yellow mealworms or fly maggots, the biochar fibers are prepared by pyrolyzing bamboo or crop straws, and the natural silicon source is diatomite, bentonite or perlite; the particle size of the natural silicon source is micron-sized, and the trace element solution contains zinc, iron, copper and manganese elements. The culture medium has the beneficial effects that the problems of unbalanced nutrition, poor physical performance, weak disease resistance and the like of the culture medium in the prior art are effectively solved.

The invention discloses a construction method and application of a fucoidin fingerprint spectrum, monosaccharide composition of fucoidin is used as fingerprint spectrum research of index components, and ion chromatography fingerprint spectrums of different batches of fucoidin are constructed by optimizing an acid hydrolysis method and ion chromatography conditions. A theoretical basis can be provided for the quality control of the fucoidin. Meanwhile, the ion chromatograms of different algal polysaccharides are analyzed to find that different algal polysaccharides have differences, and reference is provided for quality control of fucoidin and algal polysaccharides from different sources.

The invention relates to a polysaccharide and oligopeptide composition and application thereof in promoting plant growth. The polysaccharide and oligopeptide composition comprises the following components: xanthan gum, algal polysaccharides, a grifola frondosa extract, soybean oligopeptide, wheat oligopeptide, corn oligopeptide, modified silicon dioxide, itaconic acid, indolebutyric acid, glycine, glutamic acid, citric acid and fatty alcohol-polyoxyethylene ether. Wherein the modified silicon dioxide is obtained by reacting silicon dioxide with an acrylate-based silane coupling agent and then reacting with acrylic acid esterified humic acid. According to the plant growth promoter, the modified silicon dioxide is compounded with various substances such as polysaccharide and oligopeptide, the components are good in compatibility, the stability of the product is improved, the action time is prolonged, the absorption efficiency is improved, plant growth can be efficiently promoted, the defects of existing products are overcome, and the plant growth promoter has important significance on development of plant growth promoter products.

The invention discloses a biomass charcoal-based composite saline-alkali soil modifier which is obtained by mixing biomass charcoal and a glomalin extracting solution, oscillating, drying in the shade, and fully and uniformly mixing with monopotassium phosphate, potassium nitrate, potassium humate, algal polysaccharides and starch modified bentonite according to a formula. According to the modifier disclosed by the invention, after the glomalin is loaded on the biomass charcoal, under the supporting action of a carbon skeleton, the glomalin is used as an organic cementing substance for expanding a space, so that the soil agglomeration process is accelerated, the proportion of large aggregates is remarkably increased, and meanwhile, a positive promoting effect on the growth of a soil root system is achieved; the soil structure of a plough layer is improved, saline-alkali obstacles are reduced, and particularly the corn yield increasing effect is remarkable. In addition, the glomalin is loaded on the biomass charcoal, so that the degradation or loss of the glomalin is reduced, the glomalin can be slowly released and synergized under the action of microorganisms, and the application efficiency of the glomalin is improved.

The invention discloses a biochar-based soil improvement fertilizer and a preparation method thereof, and belongs to the technical field of agricultural fertilizers, the biochar-based soil improvement fertilizer comprises the following components by weight: 50-70 parts of modified biochar; 10-15 parts of a chemical fertilizer; a chitosan chain segment and an amino acid polymer chain segment are grafted on the modified charcoal; the raw materials of the modified biochar comprise biochar, chitosan and an amino acid polymer in a mass ratio of 1: (0.1-0.3): (1.5-2.5). In addition, the biochar-based soil improvement fertilizer also comprises 3-4 parts of zinc humate. According to the biochar-based soil improvement fertilizer disclosed by the invention, the adsorption capacity and anti-saturation capacity of biochar to anions and cations are improved, and meanwhile, the biochar-based soil improvement fertilizer is endowed with excellent soil hardening resistance and water and fertilizer retention performance, so that synergism and unification of soil improvement and efficient utilization of nutrients are realized.

The present application relates to the technical field of corn fertilization, and provides a corn whole growth period precise fertilization method, which comprises the following steps: S1, applying base fertilizer containing nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, brown algal polysaccharide, calcium ammonium nitrate, zinc citrate, potassium humate and gamma-polyglutamic acid between corn rows when corn is sowed; S2, spraying leaf fertilizer containing potassium dihydrogen phosphate, magnesium sulfate, alginic acid and polyaspartic acid during the corn filling stage; the base fertilizer is slow-release fertilizer, and after granulation, the base fertilizer is coated with a polyester composite layer and a wax layer in sequence. According to the present application, the base fertilizer is made into double-layer coated slow-release particles and applied with sowing, the outer layer of furfural / wax forms a hydrophobic barrier to inhibit the burst release and salt damage during the seedling stage, and the inner layer of polyester composite layer forms controllable water channels and slowly hydrolyzes with time, so that nutrients are supplied in stages in a platform mode during the corn growth period, and precise fertilization and efficient utilization are achieved during the whole growth period.

The invention relates to a zinc ion battery electrolyte containing polysaccharide zinc chelate as well as a preparation method and application thereof, the electrolyte comprises a deionized water solvent, a soluble zinc salt solute and a polysaccharide zinc chelate additive, and the addition amount of the polysaccharide zinc chelate additive is 0.20 mmol / L to 1.35 mmol / L; the polysaccharide zinc chelate additive is any one or more of zinc hyaluronate, zinc tannate, algal polysaccharide zinc, rice bran polysaccharide zinc chelate and multiflower knotweed vine polysaccharide chelated zinc. A trace amount of green and safe polysaccharide zinc chelate additive is added into the zinc salt water electrolyte, so that on one hand, hydrogen evolution side reaction is effectively inhibited, and on the other hand, dendritic crystal growth on the surface of a negative electrode is inhibited; when the electrolyte is applied to the aqueous zinc ion battery, the cycle stability of the battery can be remarkably improved, and the cycle life of the zinc ion battery is effectively prolonged.

The invention relates to a biostimulant composition containing polymerized glutamate sugar ester as well as a preparation method and application thereof, and belongs to the technical field of fertilizer synergists. According to the scheme, the full-water-soluble composite biostimulant is prepared by taking polymerized glutamate sugar ester and algal polysaccharides as main functional components and compounding active substances such as gamma-aminobutyric acid. The product can achieve the functions of promoting crop rooting, improving nutrient absorption and utilization efficiency, improving crop stress resistance, improving crop quality, improving soil, preserving water and fertilizer and the like according to different composition components.

The invention relates to a lubricant for drilling fluid, a lubricant additive and a preparation method and application of the lubricant and the lubricant additive. The lubricant additive comprises C8-C14 vegetable oil, molybdenum disilicide, natural resin and / or modified natural resin, an algal polysaccharide solution, a nonionic surfactant and a defoaming agent. The C8-C14 vegetable oil with excellent thermal stability and the anti-extreme-pressure molybdenum disilicide are used as core lubricating components, and are compounded with the anti-salt emulsification system consisting of the natural resin, the algal polysaccharide and the surfactant and the defoaming agent, so that the lubricant still keeps stable lubricating property and emulsification state in extreme environments such as high temperature (more than 200 DEG C) and high salt; the defects that a traditional product is easy to decompose and demulsify are effectively overcome, the defoaming agent has excellent defoaming capacity and wide universality, and the efficiency and safety of deep well and ultra-deep well drilling operation are remarkably improved.

The invention discloses an anoectochilus formosanus beverage and a preparation method thereof, and relates to the technical field of beverage preparation, the beverage is composed of the following raw materials by weight: 5-10 parts of an anoectochilus formosanus extract, 2-5 parts of algal polysaccharides, 1-3 parts of marine collagen, 5-10 parts of honey, 2-5 parts of lemon juice, and 70-80 parts of purified water. The anoectochilus formosanus and the marine organism extract are ingeniously combined, so that the original medicinal values of the anoectochilus formosanus for removing heat to cool blood, removing toxicity for detumescence and the like are reserved, the effects of moisturizing, resisting oxidation, enhancing immunity and the like of the algal polysaccharides are integrated, and the benefits of maintaining beauty, keeping young, promoting bone health and the like of the marine collagen are also integrated; by means of the unique combination mode, the beverage has more comprehensive and remarkable health care functions, and the high-quality requirements of consumers for healthy beverages are met.

The invention discloses a biological organic leaf fertilizer as well as a preparation method and application thereof, and belongs to the technical field of agricultural planting. Comprising the following raw materials in parts by weight: 40-55 parts of soybean protein fermentation liquor, 8-12 parts of nano silicon dioxide aerogel, 10-15 parts of bacillus subtilis, 13-20 parts of an algal polysaccharide extract, 6-9 parts of fulvic acid, 3-8 parts of trace elements, 3-5 parts of a chitosan derivative and 0.1-2 parts of a film-forming agent. The components in the foliar fertilizer provided by the invention have a synergistic effect, so that the foliar fertilizer not only can effectively provide comprehensive nutrition for soybeans and promote growth and development of the soybeans, but also can enhance the stress resistance of the soybeans, especially has outstanding performance in the aspect of relieving waterlogging damage, and is beneficial to improving the yield and quality of the soybeans. The preparation method provided by the invention is simple and easy for large-scale production, and has remarkable economic benefits.

The invention belongs to the technical field of microbial fertilizers, and particularly relates to a microbial agent coated granulated fertilizer which is of a multi-layer composite structure and sequentially comprises matrix particles, algal polysaccharides, a microbial agent, a polylactic acid-glycolic acid copolymer and polyacrylic acid-polydopamine from inside to outside, according to the microbial agent coated granular fertilizer provided by the invention, the initial viable bacteria retention rate is greater than 90%, the viable bacteria retention rate is still greater than 90% after the fertilizer is stored for 6 months and 12 months, and the organic matter content of soil can be effectively improved.

The invention relates to the technical field of high-performance fibers, and discloses a high-elasticity skin-friendly material and a preparation method thereof. The preparation method comprises the following steps: S1, treating basic fibers by using plasma equipment to obtain surface modified fibers with active functional groups on the surfaces; the basic fibers comprise terylene, regenerated terylene and nylon; s2, adding a polyether modified polyester finishing agent and a graphene cross-linking agent into tetrahydrofuran to obtain a composite finishing solution; soaking the surface modified fibers in the composite finishing liquid, heating to 30-40 DEG C, soaking for 1-2 hours, taking out, washing, drying at 100-105 DEG C for 10-15 minutes, and baking at 188-190 DEG C for 30-60 seconds to obtain composite modified fibers; and S3, adding an algal polysaccharide cross-linking agent and an initiator into water, uniformly stirring to obtain algal polysaccharide finishing liquid, immersing the composite modified fiber, heating to 80-90 DEG C, soaking for 1-2 hours, taking out, washing and drying to obtain the high-elasticity skin-friendly material.

The application is high-fiber low-fat butter with immunoregulatory function and a preparation method thereof; the butter is prepared from water phase and oil phase according to a volume ratio of 60%-80%:20%-40%; the water phase comprises water, edible mushroom polysaccharide and algal polysaccharide, and the mass fractions of the edible mushroom polysaccharide and the algal polysaccharide are 0.5%-2.5% and 0.5%-2.5% respectively; the oil phase comprises vegetable oil, polyglycerol monooleate and beeswax; the mass fractions of the polyglycerol monooleate and the beeswax are 0.5%-1.5% and 2%-3.5% respectively; the preparation method is as follows: first, edible mushroom polysaccharide and algal polysaccharide are weighed according to the proportion of the volume of the water phase, and polyglycerol monooleate and beeswax are weighed according to the proportion of the volume of the oil phase; then, the weighed water phase substances are heated and dissolved in the water phase for standby; the weighed oil phase substances are heated and dissolved in the oil phase for standby; then, the obtained water phase is added to the obtained oil phase, and mixed and homogenized under water bath condition; finally, the obtained emulsion is cooled and homogenized under ice bath condition until the emulsion is coagulated, and the high-fiber low-fat butter with immunoregulatory function is obtained.

The invention relates to a method for preparing a photocatalyst based on a polysaccharide morphology inducer and a method for degrading organic pollutants in wastewater, and the method comprises the following steps: S1, dispersing algal polysaccharides and chitosan into weakly acidic water according to a mass ratio of 1: (2-4) to obtain a 0.2-0.5 g / mL polysaccharide aqueous dispersion; powder of soluble bismuth salt is added into the dispersion liquid, stirring is conducted for 20-30 min at the rotating speed of 300-500 rpm, and according to the weight of the bismuth element, the final adding concentration of the bismuth salt is 0.1-0.3 g / mL; s2, a chlorine salt aqueous solution is prepared, the molar ratio of chlorine ions contained in chlorine salt to bismuth is 1: 1, the chlorine salt aqueous solution and the reaction system in the S1 are mixed, stirring is conducted for 30-40 min at the rotating speed of 300-500 rpm, the mixture is transferred into a high-pressure reaction kettle, and a heat preservation reaction is conducted for 3-6 h at the temperature of 170-190 DEG C; s3, adding cold water of which the volume is 2-4 times that of the reaction system, stirring for 10-20 minutes at the rotating speed of 10-50 rpm, centrifuging, collecting precipitate, washing the precipitate with distilled water, and drying to obtain the photocatalyst. Compared with BiOCl prepared without a morphology inducer, the photocatalyst shows better degradation efficiency when degradation-resistant organic matters in wastewater are degraded.

The invention belongs to the technical field of special medical foods, and particularly relates to development of a special medical weight-losing and fat-reducing food based on a raw material formula of marine active substances. The product is prepared by compounding marine active substances (such as algal polysaccharides, alginic acid and marine collagen) and medicinal and edible components (such as haws, poria cocos and coix seeds) as a core through scientific proportioning and a special medical food compliance process. The product has significant weight-losing and lipid-lowering effects, provides comprehensive nutrition support, and is suitable for obesity and metabolic syndrome patients. The core technology comprises the steps of extraction and purification of marine active substances, synergistic interaction proportioning of medicinal and edible components and standardized production process of special medical food. Clinical tests show that the product can effectively reduce body weight and body fat rate and improve blood fat metabolism, and has no side effect.

The invention relates to the technical field of agricultural fertilizers, and discloses a compound fertilizer based on bioactive hydroxyapatite superfine powder and a preparation method thereof. According to the fertilizer, animal bone-derived hydroxyapatite superfine powder is taken as a core and is subjected to compound activation through zeolite, organic silicon and titanium dioxide, and multifunctional activated powder with a core-shell structure is formed. Then compounding the activated powder with algal polysaccharides, polyglutamic acid and trace elements containing zinc, boron and molybdenum under the action of a dispersing agent, and preparing a stable concentrated suspension through a high-pressure homogenization process; or further mixing with a bentonite carrier, and preparing into a granular fertilizer through a granulation process. Through an innovative composite activation process, efficient slow release and utilization of nutrients are realized, the fertilizer is endowed with multiple functions of degrading pesticide residues, passivating heavy metals and inhibiting pathogenic bacteria, and the fertilizer is cooperated with biostimulant, so that the yield and stress resistance of crops are remarkably improved.

The invention relates to the technical field of corn, and particularly discloses a biological fermentation cornflake and a preparation method thereof. The preparation method of the biological fermentation cornflake comprises the following steps: dissolving glucose, peptone and microbial growth factor mixed salt in water, adding lactobacillus plantarum freeze-dried powder, stirring, culturing, centrifuging, collecting supernate, adding a chitosan nanoparticle solution, stirring, adding algal polysaccharide-protein gel and an activated lactobacillus liquid, and stirring to obtain a pretreated bacterial liquid; and dispersing corn in water, standing, fishing out, steaming with a steamer, pressing with a tablet press, cooling, adding the pretreated bacterial liquid, stirring, fermenting, and drying to obtain the biologically fermented corn flakes. The biological fermentation cornflake is good in crispness, high in nutrient component retention rate and simple in preparation method.

The invention belongs to the technical field of extraction and application of algae polysaccharide, and discloses gracilaria lemaneiformis polysaccharide as well as a preparation method and application thereof. The structural formula of the gracilaria lemaneiformis polysaccharide is as shown in the formula (1). The gracilaria lemaneiformis polysaccharide provided by the invention can promote reduction of cell melanin expression, has a whitening effect, and can be used for preparing medicines or cosmetics for treating / preventing skin photoaging pigmentation. The preparation method provided by the invention is green, safe, pollution-free, simple to operate, economical, time-saving and high in practicability.

The algal polysaccharide extraction and processing integrated device comprises a workbench and a bearing plate, a liquid nitrogen treatment tank and a feeding tank are arranged on the workbench, an enzymolysis tank and an extraction tank are arranged on the bearing plate, a material guide pipe is connected between the enzymolysis tank and the extraction tank, and a material guide pump is arranged on the material guide pipe; a feeding pipe penetrating through the workbench is connected between the enzymolysis tank and the feeding tank, the barrel can be transferred between the liquid nitrogen treatment tank and the feeding tank, the barrel can be inserted into the liquid nitrogen treatment tank and the feeding tank, through holes are distributed in the side wall of the barrel, a cover plate is arranged at the upper end of the barrel, a crushing shaft extending into the barrel is arranged on the lower side of the cover plate, and the crushing shaft is connected with the feeding fan. And the feeding fan and the cover plate are connected through a pipeline so as to blow air into the barrel body. According to the algal polysaccharide extraction and processing integrated device disclosed by the invention, a plurality of links such as liquid nitrogen embrittlement, crushing, conveying, enzymolysis and extraction in the algal polysaccharide extraction and processing process are integrated, so that the production efficiency is greatly improved, and the production cost is reduced.

The invention belongs to the field of xerophthalmia treatment, and relates to an astaxanthin composition for treating xerophthalmia as well as a preparation method and application thereof, and the astaxanthin composition comprises the following components in parts by weight: 25-35 parts of astaxanthin, 20-30 parts of algal polysaccharides, 5-10 parts of salidroside, 2-3 parts of menthol, 1-2 parts of borneol and 0.5-1 part of xanthophyll. The composition comprises the astaxanthin, the algal polysaccharides, the salidroside, the menthol, the borneol and the xanthophyll, and the components act together, especially the astaxanthin, the algal polysaccharides and the salidroside act synergistically, so that the composition has a remarkable curative effect in the aspect of treating the xerophthalmia, and the symptoms of the xerophthalmia can be effectively relieved. In addition, compared with some artificially synthesized medicines, the composition disclosed by the invention is prepared from natural biomass, so that the composition is relatively safe in use and low in side effect.

The invention relates to the technical field of cosmetics, and particularly discloses a tearable aerosol mask and a preparation method thereof. Raw materials of the tearable aerosol mask comprise a humectant, a thickener, a composite film-forming agent, an active matter and water, and raw materials of the composite film-forming agent comprise acetylated modified pullulan, algal polysaccharides, azone and polyvinylpyrrolidone. The tearable aerosol mask is rapid and uniform in film forming, is fluid during spraying and is gel after adhesion, the dispersion characteristic of aerosol enables the raw material components to be in contact with skin more softly, the formed mask gives the skin fresh and cool and nourishing and has no thick and sticky feeling, the efficient skin instant repairing and moisturizing effects are achieved, the toughness and adhesive force of the mask are matched with the tearable requirement, and the tearable aerosol mask is suitable for being used as a mask. The skin care mask is not easy to break when being torn off, can clean redundant substances on the surface of the skin, and can effectively meet the requirements of people for skin care portability, instantaneity and high efficiency in a mobile environment.

The present invention relates to a preparation containing hydrotalcite and seaweed polysaccharide and its use, belonging to the technical field of drugs for digestive system diseases. The preparation containing hydrotalcite and seaweed polysaccharide of the present invention is composed of hydrotalcite, seaweed polysaccharide, amino acid, filler, disintegrant and lubricant. By combining hydrotalcite and seaweed polysaccharide, the present invention can achieve a more significant therapeutic effect, solve the problem of the decrease in acid-neutralizing capacity during the storage of the preparation, maintain the stability of the preparation, keep the drug effect and extend the shelf life.

The present application relates to the technical field of baked food, and particularly relates to an antioxidant baked composition and application thereof.The present application provides an antioxidant baked composition, which comprises an antioxidant composition and a baked ingredient; the antioxidant composition comprises the following components in parts by weight: 3-5 parts of chlamydomonas reinhardtii powder, 4-6 parts of tea tree flower powder and 3-5 parts of apocynum venetum tea powder.The chlamydomonas reinhardtii in the antioxidant composition of the present application contains algal polysaccharide and carotenoid, and provides high-quality protein and polyunsaturated fatty acid; the tea tree flower contains flavonoids and tea polysaccharide; the apocynum venetum tea contains flavonoid substances; the three raw materials are compounded in the present application, the active ingredients synergistically act, the antioxidant capacity is significantly improved, and the three raw materials synergistically enrich the nutritional composition (protein, dietary fiber and functional ingredients) of the product, realizing the dual values of "antioxidation + nutrition strengthening".

The invention discloses an algal polysaccharide active coating which is prepared by taking algal polysaccharides as a matrix, compounding Vc, lysozyme and sorbitol, and a preparation method of the algal polysaccharide active coating comprises the following steps: step (1), stirring algal polysaccharides with different concentrations and 0.09% lysozyme at 40 DEG C until the algal polysaccharides and the lysozyme are completely dissolved to obtain a film forming solution; step (2), adding 30 mg / L VC into the membrane liquid formed in the step S1; (3) adding 0.3% of sorbitol into the membrane liquid formed in the step S2; and (4) carrying out ultrasonic treatment for 10 minutes by using an ultrasonic-assisted homogenizer at the power of 20kHz and 700W to obtain a uniform solution, and degassing in vacuum to form a membrane solution. The algal polysaccharide active coating prepared by the method forms an algal polysaccharide active film on the body surface of the grouper, and can be applied to a waterless keep-alive transportation method of the grouper, so that the survival time is prolonged, the transportation survival rate is improved, and the oxidative damage of the transportation tissue of the grouper is reduced.

The invention discloses a photosensitive response type composite fresh-keeping composition, a fruit fresh-keeping agent and a preparation method of the photosensitive response type composite fresh-keeping composition, and the photosensitive response type composite fresh-keeping composition comprises the following components in parts by mass: 1-40 parts of shaddock peel extract and 10-60 parts of algal polysaccharide. According to the fruit preservative disclosed by the invention, the natural shaddock peel extract and the algal polysaccharide are used as main components, so that the use of synthetic chemical additives is avoided. Compared with traditional chemical preservatives (such as preservatives and antioxidants), the coating provided by the invention is more environment-friendly, non-toxic and harmless, has no negative influence on human health, and meets the requirements of food safety and environmental protection. The shaddock peel extract is rich in coumarin compounds, the components can be subjected to photosensitive reaction under the irradiation of ultraviolet light or visible light to play antibacterial activity, and a lasting and efficient fresh-keeping effect can be shown in the storage and transportation process.

The invention provides a composite water body additive for domesticating parent fish of wild sal-family pseudosciaena crocea and application of the composite water body additive, and belongs to the technical field of aquaculture. The composite water body additive is prepared from the following components in parts by mass: 0.02 to 0.06 part of gamma-aminobutyric acid, 3 to 8 parts of esterified vitamin C, 10 to 15 parts of broad-spectrum aquatic antibacterial medicine, 20 to 50 parts of magnesium sulfate and 5 to 10 parts of algal polysaccharide extract. According to the compound additive disclosed by the invention, through scientific combination of various functional components with a synergistic effect, the compound additive has three functional modules, namely an anti-stress function module, an antibacterial function module and a water body stabilizing function module, and multi-dimensional regulation and control on internal and external environments of parent fish of wild sal ammoniac pseudosciaena crocea can be realized on the premise of not influencing basic parameters of water quality; the death rate of parent fishes can be effectively reduced, the feeding rate is improved, and the domestication period is remarkably shortened.

The utility model belongs to the technical field of algal polysaccharide purification, and particularly relates to algal polysaccharide purification equipment for an algal polysaccharide antiviral activity test, the algal polysaccharide purification equipment comprises an upper hopper and a lower hopper, an adjusting ring is rotatably connected between the upper hopper and the lower hopper, the adjusting ring is composed of two annular plates, an annular groove is formed in the inner wall of the upper hopper, and the annular plate is arranged in the annular groove. A coarse filter plate is arranged in the annular groove, and an elastic piece is arranged in the annular groove; a fine filter plate is arranged between the annular plate on the upper side and the feeding hopper, the inner wall of the annular plate on the lower side is fixedly connected with an aperture adjusting plate, the aperture adjusting plate abuts against the fine filter plate, and an angle positioning piece is arranged between the discharging hopper and the annular plate on the lower side. According to the utility model, the proper filtering aperture can be adjusted according to the separation requirement of seaweed for coarse filtration and fine filtration, and the separation effect is effectively improved.