128 results about "Periodate" patented technology

The present invention relates to a polysaccharide having functional groups, wherein said groups are aldehyde groups formed at positions C2 and / or C3 as well as at position C6 of the anhydroglucose units of the polysaccharide chain. Preferably the polysaccharide is a cellulosic fibrous material whose primary and secondary hydroxyl groups of the cellulose are oxidized into aldehyde groups at least in part by means of TEMPO oxidation and periodate oxidation.The invention also concerns a paper or nonwoven comprising the above polysaccharide. According to the invention a relative wet strength of more than 10% can be achieved.

The invention relates to a modified cotton fiber manufacturing method. It belongs to textile fiber material modification technique. It includes the following steps: boiling-off twisted cotton yarn and bleaching; processing selective oxidation reaction by putting the cotton yarn into periodate with 0.1-3g / L concentration at 30-60 centigrade degree for 1-2h; removing the oxidant; washing; dehydrating; drying; gaining oxidation cotton fiber with less than 25% strength stretch ratio; using the matter with -NH2, -OH active group to graft and cross link. Thus the cotton fiber is modified to gain multifunction composite cotton fiber. It can increase its wearability and addition value, expand application area, and solve the cotton fiber function in textile fiber material field.

The invention relates to a method for degrading organic pollutants in water by gradient ozone catalytic oxidation, and relates to a gradient ozone catalytic oxidation combination method for degrading organic pollutants in water. By the method, the problem that the conventional advanced oxidation technology has defects during individual use, the problem that the organic pollutants in the water cannot be removed efficiently, the problem that the influence of the pH value and temperature of the water on the method is large, and the problem that high-toxicity byproducts are formed are solved. In the method, water treatment is realized by combining two or three of a process for treating O3 individually, an enhanced catalytic oxidation process for O3 and an O3 / ultraviolet (UV) process sequentially. By the reasonable optimizing and gradient combination of the three treatment modes, the method is suitable for wide pH values and a wide temperature range, the pollutants with intermediate toxicity are controlled to be formed, the toxicity of the pollutants is reduced, the pollutants in the water is degraded efficiently and completely, and the content of oxidative species in effluent is controlled. An efficient oxidation treatment effect is kept at low temperature, and the generation of bromate, nitroso dimethylamine, chlorate, perchlorate, iodate and periodate can be controlled greatly.

The invention relates to a pH-sensitive reduction responsive nanogel, which comprises a disulfide-bond-crosslinked sodium alginate derivate serving as an active ingredient. A preparation method of the nanogel comprises the following steps of: adding periodate into a sodium alginate aqueous solution according to molar ratio of the glycosyl unit of the sodium alginate aqueous solution to the periodate as 1:(0.01-10), and reacting away from light to obtain dialdehyde sodium alginate; stirring and uniformly mixing a dialdehyde sodium alginate aqueous solution and a 4-aminothiolphenol ethanol solution according to the molar ratio of the aldehyde group of the dialdehyde sodium alginate to the amino group of the 4-aminothiolphenol as 1:(0.01-10) away from light at the temperature of 0-25 DEG C, and then adding sodium borohydride to obtain sulphydryl sodium alginate; and self-assembling the sulphydryl sodium alginate in an aqueous solution and oxidizing the sulphydryl sodium alginate by oxygen in the solution to obtain the nanogel. The nanogel prepared by the invention has stability, pH sensitivity and reduction responsiveness and has a potential application value in the fields of biomedical implants, biological nanotechnology, drug delivery system and the like.

The invention relates to a method for preparing a high-adsorption nano-crystalline cellulose polyvinylamine microgel by using a biomass. The method comprises the steps of acid-treating lignocellulosic materials, and performing ultrasonic treatment to obtain nano microcrystalline cellulose colloidal suspension liquid; adding periodate in the nano microcrystalline cellulose colloidal suspension liquid, adjusting pH to be 3 to 4, and reacting under a dark condition, thus obtaining a dialdehyde nano microcrystalline cellulose; dropwise adding the dialdehyde nano microcrystalline cellulose into polyvinylamine, and stirring for reacting, thus obtaining the nano-crystalline cellulose polyvinylamine microgel. The nano-crystalline cellulose polyvinylamine microgel consists of microsphere particles with the particle size of 200 to 300 nm, has a greater specific surface area, contains a great amount of free amino groups on the surface, is used for adsorbing an anionic dye and heavy metal ions in wastewater, and has higher adsorption capacity.

The invention relates to anti-crease cotton fiber manufacturing method, especially for chemical modification processing than means processing elastic starting and endowing with elasticity. It includes the following steps: boiling-off twisted cotton yarn and bleaching; processing selective oxidation reaction by putting the cotton yarn into periodate with 0.05-0.6mol / L concentration at 40-60 centigrade degree for 1-16h; removing the oxidant; washing; dehydrating; drying; gaining anti crease cotton fiber. The method not uses any cross linking agent and chemical additive. This can prevent natural cotton fiber í‹chemical fiberizeíŒ in tradition modification method. The resilience cotton fiber material can be applied to the processing of woven, braided and knitted fabric. The cotton goods have good absorbent quality, permeability, stability and elasticity, and can greatly expand cotton fiber application area.

Opiates, amphetamines, barbiturates and other drugs such as benzodiazepines are extensively abused or misused and are frequently the cause of death by overdosing. These drugs are also prone to oxidation and the final degradation products depend on the reactants and the reaction conditions. This invention describes the use of inactivating agents such as permanganates, peroxides, persulfates, bismuthates, periodates or other oxidants in a dosage form as an approach to minimize abuse and overdose. The product is designed such that the inactivating agent is released if there is an attempt to extract the drug from the formulation or in cases of overdose. Once released, the inactivating agent quickly degrades the drug and converts it into inactive compounds. Since the reactants (drug and inactivating agent) are incompatible in situations of normal drug usage, they are kept separated within the vehicle of the invention, but released for interaction in case of misuse. A catalyst may be included in the formulation to facilitate the reaction.

Compositions comprising oxidized soy polysaccharide compounds are disclosed herein. Oxidized soy polysaccharide compounds are produced by contacting soy polysaccharide under aqueous conditions with at least one N-oxoammonium salt, periodate compound, and / or peroxide compound.

The invention relates to a method for preparing nano-crystalline cellulose by a multi-site oxidation method. The method comprises the following steps: adding cellulose raw materials into reaction liquid, continuously stirring and reacting for 4.5-18.0 hours under a specific pH (Potential of Hydrogen) value; terminating reaction by absolute ethyl alcohol; carrying out centrifugation, precipitant sedimentation, cleaning solution washing and filter membrane suction filtration on a reaction product to obtain the nano-crystalline cellulose, wherein the reaction liquid is the mixture of TEMPO (2,2,6,6-Tetramethylpiperidinooxy), periodate, sodium bromide and sodium hypochlorite, oxidizing substances are TEMPO, periodate and sodium hypochlorite; the periodate selectively oxidizes C2 and C3 site hydroxyl, TEMPO selectively oxidizes a C6 site hydroxyl, and therefore, the method is called a multi-site oxidation method. The multi-site oxidization process of the method is finished in one step, processing time is short, and a technology is simple; oxidization and fiber separation processes are simultaneously carried out, a mechanical fiber separation step is not required, energy consumption is low, and a separation and purification method is simple and is suitable for industrial scale production. The prepared nano-crystalline cellulose has a wide application prospect in fields including nanocomposite materials, functional clothes, 3D printing and photoelectricity and the like.

The invention discloses a polishing solution for processing an ultra-smooth bearing steel surface and application thereof. The polishing solution comprises 0.01-40 wt% of grinding particle, 0-10 wt% of oxidizer, 0.1-10 wt% of metal complexing agent, 0-5 wt% of metal corrosion inhibitor and the balance of water. The grinding particle is selected from at least one of monocrystal diamond, polycrystalline diamond, aluminum oxide, zirconium dioxide, titanium dioxide, cerium oxide, fumed silica and colloidal silicon dioxide; the oxidizer is selected from at least one of periodate, iodate, perchlorate, persulfate and hydrogen peroxide; the metal complexing agent is selected from at least one of ammonia, amino acid and organic acid; and the metal corrosion inhibitor is selected from at least one of nitrogen-containing heterocycle derivatives, sulfur-containing heterocycle derivatives and heterocycle derivatives simultaneously containing nitrogen and sulfur. The bearing steel obtained by using the polishing solution has the functional characteristics of low surface roughness and low number of defects, and thus, can be used in precise devices.

The present invention relates generally to nucleic acid chemistry and to the chemical synthesis of oligonucleotides. More particularly, the invention relates to improved methods for synthesizing oligonucleotides wherein periodate salts are used (e.g., in organic solvents) as an oxidation reagent in oligonucleotide synthesis (e.g., for automated phosphoramidite synthesis of oligonucleotides). The invention finds utility in the fields of biochemistry, molecular biology, and pharmacology, and in medical diagnostic and screening technologies.

The invention relates to a high-strength dialdehyde microfibrillar cellulose / chitosan composite membrane and a preparation method and application thereof. The preparation method comprises the specific steps that 1, micro-fibrillation treatment is conducted on microcrystalline cellulose to obtain MFC suspension liquid; 2, oxidation treatment is conducted on the MFC suspension liquid by using periodate, dialysis is performed with deionized water for 1-3 days to remove non-reacted periodate so as to obtain dialdehyde MFC suspension liquid after the oxidation treatment is completed; 3, the dialdehyde MFC suspension liquid and a chitosan-acetic acid solution perform mixed reaction at the temperature of 50+ / -10 DEG C for 2-4 hours, and after the reaction is completed, and a reaction product is subjected to membrane spreading by adopting a tape casting method and then is dried. The composite membrane prepared by means of the preparation method has higher strength, the tensile strength is above 70 MPa, a huge network structure greatly improves the stability of a pure chitosan material in an acid solution, the composite membrane can be widely used for adsorption and treatment of dyes in wastewater, especially has efficient adsorption performance to a Congo red dye and has wide application prospect in wastewater treatment.

Reversibly crosslinked, water-soluble cellulose ethers having at least two different ether components is disclosed. At least one ether component is an alkyl, hydroxyalkyl or carboxymethyl group and at least one is an alkyl group having an aldehyde function which forms hydrolyzable hemiacetals with free OH groups of the cellulose ether. The cellulose ethers are obtainable by selective oxidation of cellulose ethers containing alkyl groups having vicinal OH groups (glycol cleavage). Preferably, water-soluble cellulose ethers are co-etherified simultaneously or subsequently with 2,3-epoxypropanol (glycidol) or 3-chloro-1,2-propanediol and the 2,3-dihydroxypropyl ether groups converted entirely or partly into 2-oxoethyl ether groups by oxidation. Suitable oxidants include periodate, periodic acid or lead tetraacetate. After washing and drying, cellulose ethers reversibly crosslinked via hemiacetals can be dispersed in water or aqueous solutions, going into solution homogeneously with a time delay. No low molecular weight dialdehydes or other problematical crosslinking reagents are liberated on dissolution.

The invention relates to a method for removing pollutants in water through stepwise catalytic oxidation-biological activated carbon-ultraviolet (UV) combination. The method aims at solving the problem that the existing advanced oxidation-biological activated carbon combination technology is difficult to eliminate a few polyhalogenated substances and high-valence inorganic salts in water with micropollutants. The method comprises the following steps that 1, water needing to be treated enters into a stepwise catalytic oxidation reactor and is subjected to stepwise catalytic oxidation; 2, the water treated by the step 1 flows out from the stepwise catalytic oxidation reactor and flows into a biological activated carbon reactor; and 3, the water treated by the step 2 flows out from the biological activated carbon reactor; nitrogen is fed into the water; and the water with nitrogen is fed into an ultraviolet reactor and is subjected to ultraviolet light irradiation so that it is finished that pollutants in the water are removed through stepwise catalytic oxidation-biological activated carbon-UV combination. Through the method, removal rates of extremely refractory organic matters such as polyhalogenated substances and the like can reach 55%; and removal rates of perchlorates and periodates can reach 62%. The method is utilized for treatment on water with micropollutants.

A rapidly-hydratable oxidized resistant starch having a cold-water hydration at least 20% greater than the resistant starch before oxidation, makeable by oxidation with an oxidizing agent selected from the group consisting of periodate, chromic acid, permanganate, nitrogen dioxide, and alkali metal hypochlorites. The starch may be made by a process for preparing a rapidly-hydratable resistant starch comprising the steps of swelling starch granules in the presence of alkali and / or heat, dispersing at least one cross-linking agent, mixing said dispersion, adding an oxidizing agent to said dispersion, and agitating said dispersion.

Glycan ingredient MF4 has increased immunological competence and anti-tumour functions, which is separated from sea-animal thick shell mussel. Its relative molecular weight is 113,000. It was analyzed and identified the physical properties and chemical structure through multiple spectra and methods, of which spectra are such as UV, IR, GC / MS,1HNMR, of which chemical methods are such as hydrolysis, acetylization, periodate oxidation, Smith degradation, methylation, sulfuric acid- carbazole reaction. Testing in vitro proves that MF4 promotes T,B lymph cells proliferation. Anti-tumour testing in vivo shows that small rat with subcutaneous inoculation is capable of inhibiting Lewis lung cancer and S-180 caruncle's growth, and has promotion functions for NK cell activity and lymph cell transfer of charged Lewis lung cance small rat. The thick shell mussel glycan MF4 is used to prepare new immonological strengthen pharmaceutics and anti-tumour drugs. And it's a new approach for developing Chinese sea biological sources.

The invention discloses a concrete curing agent, which comprises the following components in parts by mass: 20-25 parts of styrene-acrylic emulsion, 7-10 parts of acrylamide solution, 7-9 parts of sodium silicate solution, 6-9 parts of organic silicon solution 8 parts, 1-3 parts of methyl methacrylate, 1-3 parts of polyethylene glycol monomethyl ether acrylate, 3-5 parts of polyethylene glycol, 1-3 parts of polyvinyl alcohol, 4-6 parts of styrene , 6-8 parts of methyl acrylate, 5-7 parts of butyl methacrylate, 3-5 parts of butyl acrylate, 4-6 parts of ethyl methacrylate, 1-3 parts of ammonium thiosulfate, EPDM 1-3 parts of rubber, 0.7 parts of butyl citrate, 1 part of soda ash, 0.5 parts of gypsum powder, 0.1 part of periodate lignin, 0.1 part of surfactant, 0.2 part of defoamer, 0.3 part of leveling agent and benzene 1 part methanol. The curing agent disclosed by the invention can effectively prevent water loss inside the concrete, and is environmentally friendly and pollution-free.

The invention relates to synthesis of a KGM (Konjac Glucomannan)-g(grafted)-AH (Alicyclic Amine) material and preparation of drug loaded nano micelle thereof, and belongs to the technical field of biological materials and slow release. The synthesis of the KGM-g-AH material comprises the following steps: firstly carrying out oxidization ring opening on KGM by using periodate, thus obtaining DAK (Dialdehyde KGM); then enabling the DAK to react with alicyclic amine, thus obtaining amphipathic KGM-g-AH. A grafted copolymer can be assembled to form nano micelle through an ethanol injection method; the nano micelle has pH (Potential of Hydrogen) sensitivity; in a neutral environment of normal tissues and blood, the nano micelle is relatively stable; in a weak acid environment of tumor tissues, imine bonds of molecules of the nano micelle are in reversible breakage, loaded drugs can be rapidly released, and the loaded drugs can be gathered in tumor cells, so that site-specific delivery of the drugs on the tumor tissues is realized. The prepared KGM-g-AH drug-loaded nano micelle is stable in structure, simple to synthesise, high in drug loading capacity, good in biocompatibility and low in cytotoxicity, has pH sensitivity and has a wide application prospect in the field of drug controlled release.

The invention provides a method of polishing a substrate comprising (i) contacting a substrate comprising a noble metal layer with a chemical-mechanical polishing system comprising (a) a polishing component, (b) an oxidizing agent, and (c) a liquid carrier, and (ii) abrading at least a portion of the noble metal layer to polish the substrate. The polishing component is selected from the group consisting of an abrasive, a polishing pad, or a combination thereof, and the oxidizing agent is selected from the group consisting of bromates, bromites, hypobromites, chlorates, chlorites, hypochlorites, perchlorates, iodates, hypoiodites, periodates, peroxyacetic acid, organo-halo-oxy compounds, salts thereof, and combinations thereof. The chemical-mechanical polishing system has a pH of 9 or less, and the oxidizing agent does not produce a substantial amount of elemental halogen. The invention also provides a method of polishing a substrate comprising a noble metal layer and a second layer using the aforementioned polishing system that further comprises a stopping compound.

The invention relates to an all-component wide-distribution organic polyaldehyde tanning agent and a preparation method thereof. The preparation method is characterized in that firstly, periodate is utilized to perform hydroformylation on polysaccharide and derivatives thereof under a proper condition, so as to retain all components of hydroformylated polysaccharide; secondly, an inorganic reducing agent is utilized to efficiently convert an iodine-containing compound into solid molecular iodine, and the solid molecular iodine is filtered and recycled; and finally, the hydroformylation product filtrate is subjected to heat treatment, so that the residual iodide is separated out in the form of steam, further absorbed by a NaOH solution and recycled, and the all-component wide-distribution organic polyaldehyde tanning agent is obtained. According to the all-component wide-distribution organic polyaldehyde tanning agent and the preparation method thereof, the technical problems that the conventional hydroformylated polysaccharide tanning agent is too narrow in molecular weight distribution and poor in tanning property, or contains the iodine-containing compound and affects the overall performance of leather after tanning are solved; besides, the prepared tanning agent retains all components of hydroformylated polysaccharide, the molecular weight distribution is wide, the shrinkage temperature of leather / fur after tannage can reach 85-90 DEG C, and the treated leather is pure white, full and soft.

A water-insoluble polymeric oxidizing medium is contemplated that has a plurality of polymerized N-pyridinium vinylbenzyl triiodide or tribromide moieties whose pyridinium rings bear two substituents, R1 and R2, that are independently a hydrido or a C1-C4 alkyl group, and correspond in structure to the formula A process for preparing aseptic water and an apparatus useful for carrying out that process, both of which utilize a contemplated polymeric oxidizing medium are disclosed, as are processes for oxidizing trivalent arsenic or antimony to pentavalent arsenic or antimony and for removing arsenic from water. Alumina particles containing meta-periodate, iron or manganese are also disclosed that can be used to sorb pentavalent arsenic and antimony, as well as cobalt and mercury.

The invention relates to a medical sealing adhesive and a preparation method thereof. The medical sealing adhesive is obtained by mixing of an aldehyde polysaccharide solution A and an amino polymer solution B, and the aldehyde content of the aldehyde polysaccharide is 4-10 mmol / g, and the aldehyde polysaccharide is prepared by firstly performing ozone oxidation on a natural polysaccharide or a derivative of the natural polysaccharide, and performing oxidation by using a low-concentration periodate. The method disclosed by the invention firstly selects ozone to oxidize the natural polysaccharide or the derivative of the natural polysaccharide, and then selects the low-concentration periodate for further oxidization; and the method significantly reduces a using amount of the periodate, shortens the oxidation time, and improves the aldehyde content of the aldehyde polysaccharide, thereby improving the bonding properties of the medical sealing adhesive.

A method for making polysaccharide dialdehydes is disclosed, which uses a combination of precipitation and separation steps to purify the polysaccharide dialdehyde formed by oxidation of a polysaccharide with periodate. The method is simple, rapid, and provides a polysaccharide dialdehyde having very low levels of iodine-containing species. The polysaccharide dialdehyde is particularly suitable for preparing hydrogel adhesives for medical applications.

A preparation method for paper pulp containing multiple functional groups comprises the following steps: providing vegetable fiber raw material; boiling the vegetable fiber raw material to prepare paper pulp; and after boiling is finished, adding an oxidation system into the paper pulp to perform oxidation modification on the fiber raw material. The oxidation system employs one of TEMPO catalytic oxidation system, a periodate, a nitrite, sodium chlorite and sodium hypochlorite. By adding the oxidation system for oxidizing fiber after the boiling step, paper pulp rich in aldehyde group and carboxyl functional group is obtained, aldehyde group is beneficial for improving the wet strength of paper, and carboxyl is beneficial for reducing energy consumption of beating and increasing the strength of paper. Additionally, the paper pulp rich in multiple functional groups is relatively easy for preparation of cellulose ether and ester derivatives.

The invention discloses a composite water treatment agent. The composite water treatment agent consists of 0.3 to 45 weight parts of permanganate, 0.3 to 45 weight parts of ferrate, 1 to 10 weight parts of sodium silicate or 0.1 to 1 weight part of periodate, and 10 to 30 weight parts of sodium hydroxide or potassium hydroxide based on the weight of pypocholoride solution at the mass percent concentration of 10 to 30 percent. According to the composite water treatment agent, permanganate is combined with ferrate, the synergistic effect between the permanganate and the ferrate is fully exerted, the defects of the permanganate and the ferrate are eliminate, the capacity of removing ammonia nitrogen, organic matter, manganese ions, odor and chromaticity in water is enhanced, a water treatment effect is greatly improved, and water treatment cost is reduced. The prepared mixed solution can be stored stably for a long time, a process is simple, and the agent is convenient to use, and improves water treatment safety.

Disclosed are gene carriers utilizing β-1,3-glucan and methods of preparing the same. The β-1,3-glucan has at least one 1,6-glucopyranoside branch and is chemically modified through periodate oxidation and reductive amination so as to impart nucleic acid-binding functional groups (for example, cationic functional groups) to at least some of the 1,6-glucopyranoside branches thereof. Triple helix β-1,3-glucan is dissolved in a polar organic solvent to form single-stranded β-1,3-glucan. By replacing, in the presence of a nucleic acid, the polar organic solvent for the solution containing the chemically modified single-stranded β-1,3-glucan by water, a complex (gene carrier) is formed in which the nucleic acid is bound to double-stranded β-1,3-glucan.

The invention provides a method for treating organic wastewater by utilizing g-C3N4 heterogeneous activated periodate, and the method comprises the step of activating the periodate by the g-C3N4 underthe illumination condition to generate strong oxidizing free radicals for mineralization degradation toxic organic pollutants in the wastewater, so that the purposes of wastewater treatment or waterbody repair are achieved. The method disclosed by the invention is simple and convenient to operate, low in cost, high in economic applicability and high in organic substance degradation efficiency, is especially suitable for wastewater containing organic dyes and can also be used for treating some biodegradable wastewater with low biodegradability. In addition, metal ions do not need to be introduced, so that the problem of secondary pollution caused by heavy metal-containing catalysts is solved.

A method of treating alginic acid to produce polyguluronic acids. The method involves: (a) mixing the alginic acid with water and lithium hydroxide in respective amounts sufficient to form a reaction mixture that is an acidic solution comprising at least 5 wt % of the alginic acid; (b) treating the reaction mixture, with addition of a periodic acid or a periodate salt, to effect an oxidation of the alginic acid that results in formation of (i) an oxidized product that, upon acidifying and heating, hydrolyzes into a plurality of components including polyguluronic acids that are substantially free of mannuronic acid contamination, with the polyguluronic acids having an average degree of polymerization of less than 20; and (ii) free iodine; (c) separating the free iodine from the reaction mixture; (d) acidifying and heating the reaction mixture to hydrolyze the oxidized product into the plurality of components; (e) adjusting the pH of the reaction mixture to form a precipitate of the polyguluronic acids; and (f) recovering the precipitate. There is also disclosed a method of treating alginic acid using steps (a), (b) and (c) to form concentrated solutions for use in producing polyguluronic acids.