67 results about "Cation binding" patented technology

The invention relates to triazole salts, to their preparation and to applications thereof. The salts have at least one anionic triazolium group which carries at least one chlorosulphonyl, fluorosulphonyl or alkoxyfluorosulphonyl group, each of the anionic groups being combined with a proton or a cation that has a valency of less than or equal to 4. The salts are useful as synthesis reagents, as chemical-reaction or polymerization catalysts, and as ion-conducting materials for electrochemical generators, supercapacitors and electrochromic devices.

The present invention provides compositions and methods for increasing absorption of antibacterial agents, particularly third generation cephalosporin antibacterial agents, in oral dosage solid and/or suspension forms. Specifically, the composition is comprised of a biopolymer that is preferably swellable and/or mucoadhesive, a antimicrobial agent, and a cationic binding agent contained within the biopolymer such that the binding agent is tonically bound or complexed to at least one member selected from the group consisting of the biopolymer and the antimicrobial agent.

The invention discloses a method for separating methionine from a mixed solution of methionine salt and carbonate by using bipolar membrane electrodialysis. The method is characterized by comprising the steps of arranging a bipolar membrane electrodialysis system, and separating methionine from a mixed solution of methionine salt and carbonate by using a bipolar membrane electrodialysis process, wherein a bipolar membrane is capable of simultaneously generating hydroxyl ions and hydrogen ions through hydrolytic dissociation, the hydrogen ions are capable of neutralizing methionine ions and carbanions in the mixed solution of methionine salt and carbonate to generate methionine, and the generated hydroxyl ions are capable of combining with positive ions to obtain inorganic base. According to the method, a large quantity of acid and alkaline are not required to be additionally introduced in the bipolar membrane electrodialysis process, the environment friendliness is achieved, the process cost is lowered, no inorganic salt waste residue is generated in the process, the recovery efficiency of methionine is high, and the purity is high, thus the generated wastewater is more easily treated.

It is an object of the present invention to provide a polyion complex used as a non-viral gene vector, which achieves sufficiently high gene expression efficiency to a target cell. The polyion complex of the present invention comprises a block copolymer formed by binding polyethylene glycol to polycation via a disulfide group and a nucleic acid.

The invention belongs to the technical field of electrochemical synthesis and relates to a preparation method for tetra-alkyl ammonium hydroxide. A three-film four-chamber electrodialysis device is adopted, and tetra-alkyl ammonium salt serves as raw material to prepare the tetra-alkyl ammonium hydroxide. Firstly, a tetra-alkyl ammonium salt aqueous solution, pure water, anolyte and an acid solution are added to a salt chamber, a cathode chamber, an anode chamber and an acid chamber respectively, power is turned on, tetra-alkyl ammonium cations penetrate a first cation film to enter the anode chamber, anions penetrate an anion film to enter the acid chamber; the anolyte is electrolyzed to generate O2 and cations H+, and the H+ combine with the anions coming out of the salt chamber to generate anolyte after the H+ enter the acid chamber; and water molecules is electrolyzed at a negative plate to form H2 and anions OH-, and the anions OH- combine with the tetra-alkyl ammonium cations to form a tetra-alkyl ammonium hydroxide solution. The preparation method is simple in process, convenient to operate, scientific in principle, low in cost, environmentally friendly, and capable of being applied to large-scale industrial production easily.

The present invention provides an air purifier which comprises an ion generating unit, the ion generating unit comprises a first electrode for generating cation and a second electrode for generating electron to form neutral atom by combining with the cation. The air purifier also comprises: a main body having a suction mouth and an exhaust mouth; a ventilator for exhausting the sucked-air to the exhaust mouth; an exhaust passage formed between the ventilator and the exhaust mouth; the ion generating unit arranged on the exhaust passage comprises the first electrode for generating cation and the second electrode for generating electron to form neutral atom by combining with cation.

The invention discloses a wet process phosphoric acid purification technology of nonphosphate precipitation and belongs to the field of phosphorus chemical industry. According to the wet process phosphoric acid purification technology of nonphosphate precipitation, an agent is combined with anions and cations in diluted phosphoric acid to generate an indissolvable double salt which is precipitated in a form of nonphosphate, so that a purpose of wet process phosphoric acid purification is achieved, thereby satisfying the demand of producing a high-concentration phosphate fertilizer, a water soluble fertilizer and an industrial phosphate product. The method can remove iron, magnesium, aluminum, arsenic, lead, sodium, potassium, sulfate radicals and the like stably in wet process phosphoric acid and has characteristics of being simple in reaction condition, short in a process flow, wide in an agent source, low in a treatment cost, high in a P2O5 recovery rate and the like, so that sesquioxide-removal, heavy metal removal and desulfuration by a one-step method are realized. The removal rates of iron, magnesium and aluminum in the treated wet process phosphoric acid separately reaches above 97%, 70% and 15%; arsenic and lead in diluted acid are less than 5 ppm; sodium (calculated by NaO) and potassium (calculated by K2O) are separately lower than 0.025% and 0.083%; sulfate radicals are lower than 0.16%; and the P2O5 recovery rate is higher than 98.5%.

Described herein are compositions and methods useful for the purification of aqueous fluids using dendritic macromolecules. The process involves using dendritic macromolecules (dendrimers) to bind to or chemically transform solutes, and a filtration step to produce fluid from which solutes have been removed or chemically transformed. Examples of dendrimers that may be used in the process include cation-binding dendrimers, anion-binding dendrimers, organic compound-binding dendrimers, redox-active dendrimers, biological compound-binding dendrimers, catalytic dendrimers, biocidal dendrimers, viral-binding dendrimers, multi-functional dendrimers, and combinations thereof. The process is readily scalable and provides many options for customization.

The invention discloses a preparation method of quantum dots using deprotonated thiol as a surface ligand. The preparation method comprises: pre-treating a proton-containing thiol ligand by using a deprotonation agent to obtain a deprotonated thiol ligand; and mixing a pre-prepared original ligand quantum dot solution and the deprotonated thiol ligand, stirring for a predetermined time at a room temperature, carrying out a ligand exchange reaction, and washing to obtain the quantum dots using the deprotonated thiol as the surface ligand. According to the present invention, the reaction rate ofthe preparation method is rapid, the deprotonated thiol after the exchange is firmly combined with the cation on the surface of the quantum dot, and finally the obtained quantum dot using the deprotonated thiol as the surface ligand has characteristics of strong stability and high light-emitting efficiency.

The invention discloses a preparation method of quantum dots using deprotonated carboxylic acid as a surface ligand. The preparation method comprises: pre-treating carboxylic acid by using an organicalkali or an inorganic alkali to obtain a carboxylate solution; and mixing a pre-prepared original ligand quantum dot solution and the carboxylate solution, stirring for a predetermined time at a roomtemperature, carrying out a ligand exchange reaction, and washing to obtain the quantum dots using the deprotonated carboxylic acid as the surface ligand. According to the present invention, the reaction rate of the preparation method is rapid, the deprotonated carboxylic acid after the exchange is firmly combined with the cation on the surface of the quantum dot, and the finally obtained quantumdot colloid solution using the deprotonated carboxylic acid as the surface ligand has characteristics of strong stability, good solubility and high light-emitting efficiency.

The invention discloses a preparation method of quantum dots using deprotonated amine as a surface ligand. The preparation method comprises: pre-treating a proton-containing amine by using acyl chloride or sulfonyl chloride to obtain a corresponding deprotonated amine solution; and mixing a pre-prepared original ligand quantum dot solution and the deprotonated amine solution, stirring for a predetermined time at a room temperature, carrying out a ligand exchange reaction, and washing to obtain the quantum dots using the deprotonated amine as the surface ligand. According to the present invention, the reaction rate of the preparation method is rapid, the deprotonated amine after the exchange is firmly combined with the cation on the surface of the quantum dot, and finally the obtained quantum dot colloid solution using the deprotonated amine as the surface ligand has characteristics of strong stability and high light-emitting efficiency.

The invention discloses a method for preparing a polyelectrolyte composite nanofiltration membrane by using a freeze drying technology, and belongs to the field of membrane separation. The method comprises the following steps: pretreating porous basement membranes, and removing surface impurities; dissolving polycations and polyanions into a solvent respectively to form respective solution; carrying out static assembling on the pretreated basement membranes in the polycation solution, then washing with deionized water, removing the polycations which are not adsorbed on the surfaces of the basement membranes, and naturally volatilizing the solvent at room temperature; combining the polyanions with negative charges with the polycations with positive charges by using a dynamic assembling form, and assembling the polyanions and the polycations onto the surface of the obtained membrane through the effect of ionic bonds; putting the obtained assembled membrane into a freeze drying machine, and completely carrying out ice crystallization on the solvent in a polyelectrolyte composite membrane in the condition of low temperature, and then carrying out sublimation drying to prepare the polyelectrolyte composite nanofiltration membrane which is used for removal of water system small molecular substances and has good separation and stability.

The present invention provides compositions and methods for increasing the absorption of antimicrobial agents, particularly third generation cephalosporin antibacterial agents, in oral solid and/or suspension dosage forms. In particular, the composition consists of a biopolymer, preferably swellable and/or mucoadhesive, an antimicrobial agent and a cationic binding agent contained within the biopolymer so that the binding agent acts as Ionically bound or coordinated with at least one component selected from biopolymers and antimicrobial agents.

A device and method for radioembolization in the treatment of cancer cells in the body. In preferred embodiments, a radiomicrosphere is formed from a resin where an alpha emitting isotope is used for tumoricidal purposes. As the alpha emitter decays, daughters of the alpha decay are captured by the resin. In accordance with the preferred embodiments, the resin is polyfunctional where the resin has at least three different types of functional groups for cation binding. In preferred embodiments, the three functional groups bonded to the resin include a carboxylic acid group, a diphosphonic acid group, and a sulfonic acid group. In further embodiments, the device comprises at least two isotopes; wherein a first isotope is for therapeutic purposes and a second isotope is for dosimetric purposes. The second isotope is a positron emitter for PET based dosimetry. In preferred embodiments, a post-treatment radiation absorbed dose is determined using the present invention, allowing both treatment and treatment efficacy to be provided to a cancer patient.

A more efficient process of sealing an anodized aluminum article, which can facilitate higher production rates than conventional sealing techniques, includes steps of providing an article comprised of aluminum or an aluminum alloy that has been anodized, treating the oxide layer with a solution containing an anion capable of combining with a cation to form a water-insoluble precipitate, and contacting the treated oxide layer with a second solution containing a cation which combines with the anion to form a water-insoluble precipitate. In certain embodiments, the oxide layer can be treated with a dye to provide a sealed anodized aluminum article exhibiting enhanced dye retention.

The present invention relates to a two-step method for the purification of divalent cation binding proteins with high yield and high purity on anion exchange resin materials, to divalent cation binding proteins obtainable by said method, and to a kit comprising means for carrying out said method.

The present invention is directed to a synthetic peptide having a length of not more than 30 amino acids comprising a divalent cation binding site. Such a peptide according to the present invention is part of a composition for nucleic acid amplification and provides for a so-called hot start effect.

The invention relates to an orientated rod-shaped-structure polyaniline film and a preparation method therefor. The preparation method comprises the steps of preparing an electrolyte from aniline andprotonic acid, and then, carrying out deposition by employing an electrochemical polymerization method, thereby preparing the orientated rod-shaped-structure polyaniline film, wherein the protonic acid is p-toluenesulfonic acid, naphthalene sulfonic acid, salicylic acid or dodecylbenzene sulfonic acid. The prepared orientated rod-shaped-structure polyaniline film is mainly prepared from porous cross-linked polyaniline and rod-shaped polyanilines distributed on the surface of the porous cross-linked polyaniline, and the porous cross-linked polyaniline and the rod-shaped polyanilines are separately formed through cross-linking and piling stretched polyaniline molecular chains; nitrogen atoms, connected with quinone rings, in the stretched polyaniline molecular chains are bonded to cations ofthe protonic acid to form -NH<+=>, and anions of the protonic acid are attached to the -NH<+=> in the form of an ionic bond; and all the rod-shaped polyanilines are orientated along the same direction and are of non-equidistant arrangement along a direction of orientation, and holes are distributed in the rod-shaped polyanilines. The preparation method disclosed by the invention is simple, and the prepared orientated rod-shaped-structure polyaniline film is excellent in electrochromic performance.

The present invention relates to a two-step method for the purification of divalent cation binding proteins with high yield and high purity on anion exchange resin materials, to divalent cation binding proteins obtainable by said method, and to a kit comprising means for carrying out said method.