259 results about "Alginic acid" patented technology

The invention relates to the technical field of soil conditioners, and particularly discloses an intelligent controlled-release core-shell alginate soil conditioner and a preparation method thereof.The conditioner is of a core-shell-layer three-layer structure and comprises a core layer, a middle shell layer and an outer layer, the three layers account for 30%, 40% and 30% of the total weight respectively, and the core layer mainly comprises improved alginate and nutrients; the middle shell layer mainly comprises chitosan and a microbial preparation; and the outer layer mainly comprises modified charcoal and magnetic nano # imgabs0 #. The preparation method comprises the four steps of core layer preparation, middle shell layer coating, outer layer coating and forming post-treatment, and multiple functions of accurate nutrient supply, efficient heavy metal fixation and soil microenvironment regulation and control are achieved through a core-shell-layer three-layer structure design and a pH / temperature / microorganism triple response mechanism by adopting a coaxial electronic injection and layer-by-layer self-assembly technology; the fertilizer has a remarkable improvement effect on sandy soil and saline-alkali soil, and the organic matter increasing rate reaches 40%.

The invention relates to the technical field of agricultural fertilizers, discloses a seaweed extract-functional microorganism compound slow-release fertilizer and a preparation method thereof, and solves the problems in the background art. The seaweed extract is a compound containing enteromorpha polysaccharide and alginic acid extract; the functional microorganism is a complex microbial inoculant composed of phosphate solubilizing bacteria, nitrogen-fixing bacteria, phosphate solubilizing bacteria and bacillus; the slow-release carrier is prepared by coating the seaweed extract and the functional microorganisms with sodium alginate-chitosan microcapsules; the signal molecule is selected from at least one of polyamine substances and jasmonic acid methyl ester; the fertilizer has the advantages that the utilization rate of the fertilizer can be increased, growth and reproduction of soil microorganisms are promoted, the stress resistance of crops is improved, and the requirements of different soil types and planting environments can be met.

The invention discloses a metal ion-mediated composite polysaccharide-based steady-state probiotic loading body as well as a preparation method and application thereof, and belongs to the technical field of microorganisms. Sodium alginate and metal ions are coordinated and self-assembled through interaction of non-covalent supramolecules to form a metal ion-alginate skeleton network, functional guar gum is further filled, nano-scale aggregates are pushed to be spontaneously deposited on the surfaces of thalli, and a compound polysaccharide coating with excellent adhesion performance and steady-state performance is generated, so that the stability of the composite polysaccharide coating is improved. The independent coating of the probiotics is realized. The presence of metal ions increases the affinity of the biological material to the coated probiotics, and guar gum endows the probiotic delivery system with good adhesion characteristics. According to the probiotic loading body, the operation steps of an existing cell surface modification technology are simplified, the density is improved while the usage amount of biological materials is reduced, cells can be protected from being damaged by the gastrointestinal tract stress environment so as to maintain the activity of probiotics, and the colonization capacity and the biological activity of the probiotics in the intestinal tract are improved.

The invention relates to a special fertilizer suitable for saline-alkali soil and a preparation method thereof. The fertilizer is granular and has a multi-layer structure which is sequentially arranged from inside to outside: a nutrition core layer, a controlled release film layer, a soil improvement fast exchange layer and a microorganism attaching layer. The nutrition core layer contains nitrogen, phosphorus, potassium and medium trace elements, and meets the basic nutrient requirements of crops; the controlled release film layer is self-assembled layer by layer by adopting alginate / chitosan, a humic acid-ferrous complex and a breakable cross-linking point are inserted into the film, and starch is sprayed on the outer layer, so that an ionic strength / alkalinity dual-response controlled release system is formed; the soil improvement quick exchange layer contains microcrystalline gypsum and ferrous sulfate; the microbial epiphytic layer fixes salt-tolerant phosphate solubilizing bacteria, potassium bacteria and exopolysaccharide-producing bacillus by using a charcoal-zeolite carrier, and the bacteria are distributed on the surfaces of the particles in a dotted manner. The fertilizer realizes organic combination of soil improvement, fertilizer supply and microbial regulation and control, can significantly reduce the soil salinity and alkalinity in a saline-alkali soil environment, and improves the fertilizer utilization rate and the crop growth performance.

The invention relates to the technical field of soil remediation, in particular to a biochar-humic acid-calcium alginic acid composite saline-alkali soil modifier and a preparation and application method thereof. The modifier adopts a multi-layer structure design: biochar is pre-adsorbed by calcium chloride, compounded with sodium humate, and then crosslinked with sodium alginate to form a gel to form a composite inner core; secondly, sulfobetaine methacrylate and vinyl phosphonic acid are introduced into a sodium alginate molecular chain through graft polymerization, and modified sodium alginate is obtained to serve as an outer layer coating material; and finally, dipping the composite inner core into the outer layer solution, and carrying out graded recalcification by calcium chloride and short-time treatment by sodium sulfate to obtain a final product. Through the synergistic effect of calcium ion slow release of the inner core and zwitterionic characteristics of the outer layer, efficient replacement and long-term stable regulation and control of soil sodium ions are achieved, the pH value, the conductivity and the alkalization degree of soil are remarkably reduced, the water holding capacity is effectively improved, and the soil conditioner is suitable for sustainable improvement of moderate and severe saline-alkali soil.

The invention discloses a multi-element soil fertility improvement biological modifier and a preparation method thereof, and belongs to the technical field of soil fertility improvement. The modifier is prepared from modified straw aerogel, a strontium titanate loaded lignin compound, lanthanide modified potassium feldspar powder, alginic acid oligosaccharide composite gamma-aminobutyric acid, carbon nitride quantum dots, bacterial cellulose nanofibers and polyaniline nanotubes according to the mass ratio of (18-22): (15-17): (13-15): (7-10): (10-13): (3-5): (7-10): (10-13): (5-8). The composite microbial inoculant is composed of a nano zero-valent iron-montmorillonite compound and a nitrogen fixation-phosphate solubilizing composite microbial inoculant. The modified straw aerogel and the bacterial cellulose nanofibers are interwoven to form a three-dimensional network framework, a habitat is provided for soil microorganisms, the water and fertilizer retention capacity of soil is enhanced, and meanwhile, the network structure promotes transmission of nutrients and water in the soil and improves the nutrient utilization efficiency.

The invention relates to the technical field of water-soluble fertilizers, in particular to a water-soluble organic fertilizer and a preparation method and application thereof.The water-soluble organic fertilizer is prepared from, by mass, 40-100 parts of basic organic raw materials, 5-15 parts of microbial fermentation additives, 10-20 parts of nutrient element supplements and 3-7 parts of synergists; the microbial fermentation additive comprises a compound microbial agent and a microbial growth carrier, the nutrient element supplement comprises a nitrogenous fertilizer, a phosphatic fertilizer, a potash fertilizer and medium trace elements, and the synergist comprises fulvic acid and alginic acid. According to the water-soluble organic fertilizer and the preparation method and application thereof, efficient utilization and accurate supply of nutrients are achieved, the growth requirements of crops in plant factories are met, meanwhile, resource utilization of organic waste is promoted, and sustainable development of the plant factories is promoted.

The invention discloses an efficient treatment process for salt-containing industrial wastewater, and relates to the technical field of wastewater treatment. Salt-containing industrial wastewater sequentially passes through an adjusting tank, a silicon and hardness removal unit, a biochemical unit, a secondary sedimentation tank, a fluorine removal unit, a filter unit, a catalytic ozonation unit, a moving bed bio-membrane reactor treatment unit, a powder carbon sedimentation unit and an ultrafiltration-reverse osmosis double-membrane unit to be treated, produced water is recycled, and concentrated water enters an evaporation and concentration unit; the silicon removal and hardness removal unit is used for treating the wastewater by adding a flocculating agent and a composite coagulant aid; the flocculating agent is a chitosan-based flocculating agent, and the addition amount of the flocculating agent is 10 to 20 mg / L; the composite coagulant aid is composed of a magnesium-aluminum hydrotalcite coagulant aid and alginic acid-silicate hybrid microgel according to the mass ratio of 2: (1-4), and the addition amount of the composite coagulant aid is 5-15 mg / L. The treatment effect of the salt-containing industrial wastewater is remarkably improved.

An enhanced hydrogel composition, and a preparation method therefor and the use thereof. According to the composition, a hydrogel is formed by means of a physical cross-linking mechanism using the chelation between calcium ions and an alginic acid raw material, with the assistance of a carboxymethyl cellulose raw material to reduce the sensitivity of the chelation. The hydrogel retains a high water absorption rate of media; meanwhile, the elastic modulus of the hydrogel is significantly enhanced by means of the introduction of silicon dioxide. The method for preparing the composition comprises: dispersing the carboxymethyl cellulose raw material, the alginic acid raw material, and the silicon dioxide in a solution, mixing same uniformly, drying the mixture to obtain a material A, and then mixing the material A with a calcium source to obtain the composition. Further provided is the use of the composition in the preparation of a space-occupying product in the digestive tract.

The invention discloses an alginate-based high-entropy metal oxide as well as a preparation method and application thereof, and belongs to the technical field of gas sensor materials. The preparation method comprises the following steps: mixing a high-entropy metal salt solution of at least five metal sources with an alginate solution to prepare alginate-based high-entropy metal aerogel, and then wrapping the alginate-based high-entropy metal aerogel with carbon cloth and rapidly heating the alginate-based high-entropy metal aerogel by using a Joule thermal method to obtain the nanosheet-shaped alginate-based high-entropy metal oxide. The material can be used for high-sensitivity detection of ethanol gas. The preparation method provided by the invention is green, simple and rapid, has a good sensing response effect in ethanol gas detection, and the sensing material has good stability, can be recycled for multiple times, and has a good application prospect.

The invention provides a novel mineral separation activating agent for sulphide ores and a preparation method of the novel mineral separation activating agent. The cleaning agent comprises 1-2 parts of basic cupric carbonate, 2-4 parts of ammonium chloride, 2-4 parts of nanometer jade powder, 2-3 parts of alginic acid, 1-2 parts of allyl glycidyl ether, 2-3 parts of peregal O, 2-3 parts of sodium di-sec-octyl maleate sulfonate, 2-3 parts of vinyl acetate, 4-7 parts of hydrogen peroxide, 4-6 parts of disodium hydrogen phosphate and 40-50 parts of water. The preparation method comprises the following steps: firstly mixing basic cupric carbonate and ammonium chloride to obtain a first mixture, then mixing the rest components, heating and stirring to obtain a second mixture, and finally uniformly mixing the first mixture and the second mixture. The activating agent overcomes the defects of a traditional activating agent, has efficient activating performance, can improve the beneficiation efficiency of low-grade, complex and refractory sulfide ore, is environmentally friendly, good in stability and high in adaptability, and provides technical support for efficient development of sulfide ore resources.

The invention relates to the technical field of fertilizers, in particular to an alginic acid organic water-soluble fertilizer capable of quickly releasing nutrients and a preparation method of the alginic acid organic water-soluble fertilizer. The organic water-soluble fertilizer is prepared from the following preparation raw materials: 30 to 35 parts of sodium alginate, 12 to 15 parts of a seaweed extract composition, 5 to 8 parts of monocalcium phosphate, 5 to 8 parts of monopotassium phosphate, 12 to 15 parts of urea, 0.5 to 0.8 part of a chelating agent, 40 to 45 parts of an organic fertilizer raw material, 1.5 to 2 parts of a microbial strain, 12 to 16 parts of ammonium humate, 4 to 6 parts of a cosolvent and 1.4 to 1.7 parts of xanthan gum. By optimizing the ratio of the raw materials, the absorption and utilization rate of plants to the water-soluble fertilizer is remarkably improved; nutritional ingredients can be quickly released, and plants can be promoted to absorb water-soluble fertilizer; through the synergistic effect of microorganisms and organic components, the content of nutrient substances in soil is increased, plants are helped to better absorb mineral substances and trace elements, the utilization efficiency of the fertilizer is improved, healthy growth of the plants is promoted, and the yield is increased.

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a high-efficiency yield-increasing liquid fertilizer containing enzymolysis nereis and a preparation method thereof.The method comprises the steps that the nereis is cleaned and smashed, subjected to freeze-thaw cycle pretreatment and then subjected to enzymolysis through a compound protease preparation containing protease and chitinase under the alkalescence condition, and the liquid fertilizer containing the enzymolysis nereis and the chitinase is obtained; carrying out solid-liquid separation on the obtained enzymatic hydrolysate to obtain enzymatic clam worm liquid; the preparation method comprises the following steps: mixing urea, a phosphorus-potassium fertilizer, trace elements, potassium fulvate and polyaspartic acid in a preparation tank, and then adding an N-carbamoyl-L-glutamic acid-chitosan grafted copolymer and selenocysteine-alginic acid nanoparticles to obtain a nutrient solution; and finally, mixing the enzymolysis nereis solution with the nutrient solution and the plant growth regulator to obtain a finished product. Active substances in the nereis are fully released through a biological enzymolysis technology, the prepared liquid fertilizer has the functions of nutrition supply, physiological regulation and soil improvement, crop growth can be remarkably promoted, the yield can be remarkably increased, and high-value utilization of marine biological resources is achieved.

The invention discloses a bio-organic fertilizer for enhancing disease resistance of plants, and relates to the field of bio-organic fertilizers. The organic fertilizer is prepared by compounding brown algae residues, corn straws, composted chicken manure, sodium lignin sulfonate, a compound microbial agent and alginic acid-carboxymethyl cellulose composite gel. The preparation process comprises the following steps: a raw material pretreatment stage: crushing and drying brown algae residues, mixing the crushed and dried brown algae residues with corn straws subjected to alkaline hydrolysis treatment and decomposed chicken manure, and adding sodium lignin sulfonate for pre-fermentation; the compound microbial agent is compounded after being cultured step by step through bacillus subtilis and streptomycete; alginic acid and carboxymethyl cellulose are subjected to ionic crosslinking and ultrasonic treatment to form a three-dimensional gel network; mixing the pretreated substrate, the complex microbial inoculant and the gel, performing three-stage fermentation of heating, high temperature and cooling, granulating, and forming the slow-release particles by adopting a starch-alginic acid coating.

The invention discloses a composite preparation based on biological enzyme, enzyme, alginic acid, salicylic acid and trehalose and a preparation method thereof. The preparation can effectively enhance the stress resistance of plants and help the plants to resist low-temperature freezing injury, high-temperature heat injury and drought stress. The fertilizer is used for foliage spraying or root irrigation, and is simple and convenient to operate, remarkable in effect and environment-friendly.

The invention discloses a preparation method of a white kidney bean protein-propylene glycol alginate composite carrier steady-state emulsion for enhancing alpha-amylase inhibitory activity, and belongs to the technical field of emulsion preparation. The method comprises the following steps: S1, mixing white kidney bean protein with water to prepare a protein solution; s2, mixing propylene glycol alginate with water to prepare a propylene glycol alginate solution, and then mixing the propylene glycol alginate solution with the protein solution prepared in the step S1 to prepare a water phase; s3, fat-soluble active substances are added into edible oil, and an oil phase is prepared; and S4, mixing the water phase and the oil phase, and carrying out high-speed dispersion and high-pressure homogenization to prepare the steady-state emulsion. The preparation method is simple and convenient to operate, and the prepared emulsion has good milk stability, storage stability, high active substance protection capacity and high alpha-amylase inhibitor activity.

The invention discloses a special slow-release fertilizer for wheat in saline-alkali soil as well as a preparation method and application thereof, and relates to the technical field of slow-release fertilizers. The fertilizer contains various functional substances and a microbial agent, and specifically contains the following components in parts by weight: 5-10 parts of urea, 0.5-3 parts of potassium chloride, 5-10 parts of diammonium phosphate, 2-5 parts of triple superphosphate, 0.5-1 part of magnesium sulfate, 0.5-1 part of zinc sulfate, 0.2-0.5 part of boric acid, 0.2-0.4 part of resveratrol, 0.5-1 part of alginic acid, 0.3-0.5 part of fulvic acid and 1.0 part of a microbial mixed agent, and 0.1 to 0.3 part of a surfactant. According to the fertilizer, all the raw material components are reasonably compounded, the physicochemical properties of saline-alkali soil can be effectively improved while the growth requirement of wheat in the saline-alkali soil is met, and meanwhile the utilization rate of the fertilizer can be increased through the slow release effect, and damage to the environment is reduced.

Realized is reliable fixation of a material in a fluid state containing a monovalent metal salt of alginic acid when the material is applied to a subject. A combination of compositions comprising a first material composition containing a monovalent metal salt of alginic acid and a second material composition containing a cross-linking agent having an action of cross-linking the monovalent metal salt of alginic acid, wherein the combination is to be used in such a way as to apply the first material composition to a subject in a fluid state and contact the second material composition with the first material composition applied to the subject to gel at least a part of the first material composition, wherein the first material composition further contains a coloring component so that a formation state of a gel coat on a surface of the first material composition applied to the subject can be evaluated.

An edible gel composition for adsorbing alcohol, a preparation method therefor and the use thereof. Raw materials of the edible gel composition for adsorbing alcohol comprise a carboxymethyl cellulose raw material, an alginic acid raw material, and a calcium source. The mass relationship between the components in the raw materials satisfies: W1=m2 / (m1+m2)×100%, and 12％≤W1≤35％; f=m4 / m3, and 0.1≤f≤1.2; wherein m1 is the mass of the carboxymethyl cellulose raw material, m2 is the mass of the alginic acid raw material, m3 is the mass of carboxyl groups in the alginic acid raw material, and m4 is the mass of Ca2+ in the calcium source.

The invention discloses an anaerobic denitrifying bacterial agent as well as a preparation method and application thereof, and belongs to the technical field of water environment treatment. The anaerobic denitrifying bacterium agent is prepared from the following components in parts by weight: 15 to 30 parts of sterile water, 15 to 60 parts of normal saline, 5 to 10 parts of micro-capsule embedded anaerobic denitrifying bacteria, 5 to 20 parts of a porous composite modified carrier, 10 to 30 parts of a carbon source, 4 to 7 parts of nutrient elements, 2.5 to 4 parts of a buffering agent and 1 to 5 parts of a stabilizer, the micro-capsule embedded anaerobic denitrifying bacteria are obtained by embedding anaerobic denitrifying bacteria with an alginic acid gel solution and a calcium chloride solution; the porous composite modified carrier is obtained by crosslinking modified nano iron oxide, modified nano titanium dioxide, a functional polymer solution and glutaraldehyde. The anaerobic denitrifying bacterial agent provided by the invention can effectively improve the efficiency of treating nitrogen pollution of a water body.

The present application relates to the field of high polymer water-absorbing material preparation, and particularly relates to a preparation method of a chitosan-based high water-absorbing material with antibacterial function, and the prepared high water-absorbing material comprises three layers, the upper and lower surfaces are plant fiber high air permeable layers, and the middle layer is a chitosan-based high water-absorbing microsphere with antibacterial function; the plant fiber high air permeable layer is obtained by electrospinning of kapok fiber, bamboo fiber, modified montmorillonite and polyvinyl alcohol; the high water-absorbing microsphere is a gel material obtained by condensation and cross-linking of chitosan and acrylic acid and then compounding and cross-linking of alginic acid; the prepared high water-absorbing microsphere has strong deformation resistance and a uniform and smooth surface. The high water-absorbing material has a water absorption capacity of 410 g / g or more, and an absorption capacity of simulated blood of 35 g / g or more, and has the characteristics of good air permeability, strong water absorption and good antibacterial activity.

The invention discloses a marine biomass amphoteric response type polycarboxylate superplasticizer and a preparation method thereof, and belongs to the technical field of concrete admixtures. The preparation method comprises the following steps: carrying out acid hydrolysis on sodium alginate, and carrying out ultrafiltration purification to obtain alginic acid oligosaccharide; the preparation method comprises the following steps: pre-activating alginic acid oligosaccharide, adding citric anhydride, carrying out esterification reaction under the action of a catalyst, and purifying to obtain an alginic acid grafted product; mixing the alginic acid grafted product with chitosan quaternary ammonium salt, and then carrying out ionic crosslinking reaction to obtain an ionic crosslinked product; and adding a physical cross-linking agent into the ionic cross-linked substance, and purifying after freeze-thaw cycle to obtain the product. The marine biomass amphoteric response type polycarboxylate superplasticizer can solve the problems of non-renewable raw materials and low utilization rate of marine biomass of a traditional superplasticizer, can also overcome the defects of delayed cement setting and increased consistency caused by direct application of natural polysaccharides and derivatives thereof, and has wide application prospects.

The application belongs to the technical field of agricultural fertilizer, and particularly relates to a high-efficiency yield-increasing liquid fertilizer containing enzymatic nereid and a preparation method thereof, which comprises the following steps: washing and crushing nereid, and then performing freeze-thaw cycle pretreatment; under weak alkaline conditions, a complex protease preparation containing protease and chitinase is used for enzymolysis, and an enzymatic nereid liquid is obtained through solid-liquid separation; urea, phosphate-potassium fertilizer, trace elements, potassium fulvate and polyaspartic acid are mixed in a preparation tank, and then N-carbamoyl-L-glutamic acid-chitosan graft copolymer and seleno-cysteine-alginic acid nanometer microspheres are added to obtain a nutrient liquid; finally, the enzymatic nereid liquid, the nutrient liquid and a plant growth regulator are mixed to obtain a finished product. Through the biological enzymolysis technology, the active substances in the nereid are fully released, the prepared liquid fertilizer has the functions of nutrient supply, physiological regulation and soil improvement, can significantly promote crop growth and increase yield, and realizes high-value utilization of marine biological resources.

The present application relates to the technical field of burst beads, and particularly relates to a burst bead with anti-freezing performance and a preparation method thereof. The structure of the burst bead comprises wall material wrapping core liquid. The raw material of the wall material comprises a first colloid, a second colloid and an anti-freezing agent. The first colloid comprises alginate. The second colloid comprises at least one of carrageenan, polyethylene glycol, gum arabic, ethyl cellulose and guar gum. The raw material of the core liquid comprises a metal ion salt and an anti-freezing agent. The metal ion salt comprises calcium salt. The anti-freezing performance of the burst bead is improved by adjusting the formula of the burst bead production, adding the second colloid and the anti-freezing agent in the raw material formula of the wall material, and simultaneously adding the anti-freezing agent in the raw material formula of the core material. The adaptability of the burst bead wall material to environmental changes is improved. The burst bead wall material reaches the thermal expansion and contraction synchronously with the core liquid. When the environmental temperature changes, the burst bead wall material expands and shrinks with the volume increase and decrease of the core liquid. The burst bead is not easy to produce bubbles and breakage, and the anti-freezing performance is improved.

The present application relates to the technical field of traditional Chinese medicine preparation, and discloses a plant extract composition for relieving liver-QI stagnation and nodules, which is made of isomaltooligosaccharide, matrix precursor liquid derived from kelp and licorice, lipophilic concentrate, natural organic acid adjusting liquid and heat-sensitive active liquid. By in-situ reaction of the matrix precursor liquid and the organic acid, an interpenetrating network structure of glycyrrhizic acid and alginic acid is constructed in the system, and an oil-in-water emulsion gel with thixotropy and pH responsiveness is formed. The preparation method comprises matrix emulsification, organic acid atomization instantaneous initiation, low-temperature composite heat-sensitive component and double-stage cooling shaping. The present application realizes targeted enteric release of the drug by the interpenetrating network, and protects the heat-sensitive component, thus solving the problems of poor stability and low bioavailability of traditional preparations, and having the effects of soothing the liver and regulating Qi, softening and resolving nodules, and strengthening the body resistance.

The invention relates to the technical field of fertilizer production, and discloses production equipment of alginic acid synergistic controlled-release fertilizer, which comprises a granulation assembly and a machine shell, a support frame is fixed at the top of the machine shell, and an extrusion roller is arranged in the support frame; and the crushing assembly is arranged in the machine shell and comprises a crushing part, the crushing part comprises a rotating cylinder located in the machine shell, a material groove is formed in the rotating cylinder, and a filtering cylinder is arranged on the outer side of the rotating cylinder. The device has the beneficial effects that extruded and formed particle clusters are scattered and crushed through the crushing assembly, and when adhered particles follow the rotating cylinder, only when adhered bodies are rubbed and separated into single qualified particles, the single qualified particles can be discharged through the filtering cylinder; the unseparated adhesion bodies continue to be turned over along with rotation in the rotating cylinder until complete separation is achieved, no forced extrusion shear force exists in the whole process, separation is achieved only depending on the dead weight of the particles and gentle turning of rotation of the rotating cylinder, and the problem that qualified particles are broken is completely eradicated in principle.

To provide a tablet that is easy to swallow and also has reduced production cost, and a method of producing the same.SOLUTION: A tablet has a naked tablet containing a gelator, and at least one selected from sugar alcohol, monosaccharide, disaccharide, oligosaccharide, cellulose, cellulose derivative, starch, starch derivative and starch decomposition product. Preferably, the gelator is at least one selected from xanthan gum, locust bean gum, guar gum, mannan, glucomannan, hyaluronan, agar, alginic acid, tamarind gum, psyllium seed gum, tara gum, carrageenan, acacia gum, gum arabic, ghatti gum, tragacanth gum, karaya gum, cassia gum, rhamsan gum, welan gum, macrophomopsis gum, curdlan, pullulan, gellan gum, pectin, and soybean polysaccharide, gelatin, collagen, polyglutamic acid, polylactic acid, polyglutamic acid and the like.SELECTED DRAWING: None

The invention discloses a rapid detection method for domoic acid based on a carbon nanotube and an aptamer, and belongs to the field of domoic acid detection.The rapid detection method comprises the steps that the amino-modified aptamer is covalently fixed to the surface of the single-walled carbon nanotube in an orientation controllable mode through carboxyl activation-amide bonding, and an integrated conductive sensing element is constructed; after the element is in contact with a sample to be detected, domoic acid is specifically combined with the aptamer to cause instantaneous change of conductance of the carbon nano tube, and a result is read by the micro-bridge circuit and output within 1 minute. The method does not need pretreatment, large-scale instruments and cold chain storage, has strong anti-interference capability on complex matrixes, has a detection limit of 0.02 ng mL and has relative standard deviation of lt; therefore, on-site high-sensitivity rapid screening of domoic acid is realized.

The present invention relates to a composite treatment agent for oily wastewater and its application, belonging to the technical field of wastewater treatment. The composite treatment agent for oily wastewater of the present invention is mainly composed of the following components by weight: 25-35 parts of an aluminum salt flocculant, 8-12 parts of sodium polyacrylate, 4-9 parts of ethylenediaminetetraacetic acid salt, 2-6 parts of pyrophosphate, 1-4 parts of xanthan gum, 2-5 parts of an alkali metal salt of hexadecylbenzenesulfonate, 3-8 parts of alginate, 1-2 parts of a biological agent, and 5-10 parts of rare earth-modified attapulgite; the biological agent includes yeast, Bacillus subtilis, and lactic acid bacteria. The raw materials used in the composite treatment agent for oily wastewater of the present invention are low in toxicity, can avoid secondary pollution to the environment, are easy to use, require a small amount, have a high oil removal rate, and have a very obvious water purification effect. The water quality of the treated oilfield wastewater can meet the standards for reinjection into the formation and the comprehensive water quality discharge standards, and can reduce environmental pollution.

The present invention provides a novel alginic acid derivative and a novel crosslinked alginic acid. Alginic acid derivatives represented by formula (I) and formula (II), and novel crosslinked alginic acid obtained by performing a Huisgen reaction using the alginic acid derivative represented by formula (I) and the alginic acid derivative represented by formula (II).