44results about How to "Does not cause degradation" patented technology

The invention discloses a treatment method of a riboflavin fermentation liquid, and belongs to the technical field of riboflavin production. The method comprises the following steps of carrying out solid-liquid separation on the riboflavin fermentation liquid by adopting a centrifugal mode to obtain wastewater containing 500-800ppm of riboflavin and 2-3wt% of thallus; adjusting the pH value of the wastewater obtained through solid-liquid separation to be 8-9, adding an anionic flocculant which is 0.005-0.01% of weight of the wastewater, stirring, dissolving, standing and precipitating, discharging a supernatant liquid to obtain a fermented bacterial concentrated solution; adjusting the pH value of the fermented bacterial concentrated solution obtained through precipitating and separation to be 5-7 and carrying out inner dehydration by adopting a stirring mode; carrying out filter pressing on the liquid obtained through inner dehydration under relatively low feed pressure and carrying out high-pressure squeezing under relatively high squeezing pressure after filter pressing is completed; and drying a filter cake obtained through high-pressure squeezing to obtain a by-product rich in an organic matter.

The invention relates to a riboflavin-containing solid preparation. The riboflavin-containing solid preparation comprises, by weight, 23.0-65.0% of riboflavin, 18.0-65.0% of a diluent, 0.25-7.5% of a disintegrating agent, 0.1-5.5% of a binder and 0.5-2.0% of a lubricant. The riboflavin comprises spherical crystals with sizes of 25-35 micrometers and has purity greater than 98%. The riboflavin has the advantages of high purity, good processing performances and good fluidity. The solid preparation has a fast disintegrating rate and good stability.

The invention discloses a wood fiber homogeneous phase transesterification modification method. Wood fibers are dissolved in an ionic liquid, transesterification agents are added to react with the wood fibers, and esterified modified wood fibers are obtained after deposition, washing, filtering and drying. The method is advantageous in that reaction conditions are mild, the technology is simple, the modification efficiency is high, the modification degree is easy to control, catalysts are not needed, products are easy to separate, no acidic by-products are generated during the reaction, degradation of wood fiber components cannot be caused, the employed ionic liquid can be recycled, and the wood fiber substitution degree is easy to control. The provided method has high practicality and good economic prospects.

The invention relates to a composition suitable for topical application comprising water, dimethyl isosorbide, a polyol and a phenolic or polyphenolic antioxidant. A method for producing the composition is also part of the invention, as is a kit for making the composition. Optionally, the phenolic or polyphenolic antioxidant is provided in the form of a lyophilisate for the method and the kit. Theuse of the composition for a treatment by topical application is also within the scope of the invention.

The invention discloses a preparation method of a phospholipid extract of chicken skin and belongs to the technical field of food biology. An extraction method of functional phospholipids, provided by the invention, comprises the steps of preparation of the chicken skin, solvent extraction of total lipid, drying, silica gel column separation, concentration, phospholipid detection and the like. The extract obtained by using the method is rich in multiple functional phospholipids such as cephalin, lecithin and sphingomyelin, a phospholipid side chain contains unsaturated fatty acid, and the human health is facilitated. The method is simple and convenient to operate, low in cost and higher in extraction rate, and can be widely applied to preparation of the functional phospholipids in the chicken skin. The extract can be widely applied as a raw material of healthcare food.

The invention provides a modifying method for heterocycle aramid and relates to the technical field of high polymer materials. The modifying method is mainly specific to the heterocycle aramid containing an imidazole structure. Bromomethylbenzoic acid is introduced to a molecular chain of a fiber, in the manner of nucleophilic substitution of imidazole nitrogen atoms; and then, high-temperature decarboxylation coupling is performed, so as to form a crosslinking structure; lastly, nucleophilic substitution reaction occurs between the fiber and the bromomethylbenzoic acid under low temperature;low temperature can avoid decarboxylation reaction, a plenty of carboxyl groups are remained on the fiber surface and the polarity of fiber surface is promoted. The modifying method has the advantagesof simple and convenient operation, low requirement for equipment, gentle reaction conditions, incapability of triggering degradation of heterocycle aramid and capability of promoting both compression strength and interlayer shear strength of heterocycle aramid. A modified heterocycle aramid, compared with the present heterocycle aramid, has higher compression strength and shear strength. The present polymerization and spinning processes need not be changed during the preparation process of the modified heterocycle aramid; the modifying process is simple; the cost is low; the modifying methodis suitable for large-scale industrial production.

The invention discloses a larimichthys crocea scavenger receptor gene MARCO gene and an immune defending function thereof. An open reading frame sequence of the MARCO gene is obtained by adoption of ahomology-based cloning method and a RACE technique, the sequence is shown as SEQ ID NO:1, the overall length is 1218bp, and 405 amino acids are encoded. The MARCO gene is applied to the larimichthyscrocea immune defending function including congential immunity regulation for maintaining body health and evolution. The MARCO gene is obtained by adoption of the homology-based cloning method and theRACE technique, effectiveness in total RNA extraction in a cloning process is achieved, intrinsic RNA enzyme inactivation can be realized, and total RNA yield and purity are improved. By the immune defending function of the MARCO gene, a theoretical basis is provided for prevention of diseases caused by pathogenic bacteria, and theoretical guidance is provided for disclosing healthy aquaculture of larimichthys crocea.

A medicament and a dosing method for controlling the running corrosion of an air-cooling system in a thermal power plant, the medicament includes 1% to 10% N, N-dimethylethanolamine, 0% to 10% 3-diethylaminopropylamine, 1% to 10 %Triethanolamine, 0%~10% diethanolamine, 1%~10% ethanolamine, 1%~10% methoxypropylamine, 1%~10% diisopropylamine, 0%~10% hexamethylene tetra Amine, 0% to 10% N-(2-aminoethyl) morpholine and 1% to 10% hydrazine are at least six of the ten kinds of medicaments, and the balance is deionized water, which is prepared into a solution by deionized water; Adding a concentration of 0.3mg / L to 1.5mg / L can effectively control the corrosion of the air-cooling system, and has no effect on the performance of the condensate demineralization resin. Long-term operation under conditions.

The invention relates to the technical field of biology, and particularly discloses a method, a probe library and a kit for detecting tumor ctDNA methylation with high throughput and high sensitivity. The method comprises the following steps: introducing two common sequencing linker sequences into DNA of a blood sample to be detected, carrying out enzyme digestion by using methylation-insensitive incision enzyme, leaving methylated DNA molecules and a non-target region without enzyme digestion sites, then carrying out PCR amplification and probe hybridization to enrich the DNA of the target region, and carrying out sequencing on the DNA of the blood sample to be detected. The methylation state of a ctDNA target area in a blood sample to be detected is analyzed and identified through high-throughput sequencing, the method has the advantages of being high in sensitivity, high in throughput and capable of achieving digital analysis, bisulfite conversion is not needed, and the problems of fragmentation and incomplete conversion caused when the ctDNA is treated through bisulfite are effectively solved.

The invention provides a plastic product and a preparation method thereof. The method comprises the following steps: 1) forming a plastic base, wherein the plastic base contains chemically plated catalysts which are compounds shown in the formula I, II or III; 2) removing the plastics in the selected area on the surface of the plastic base and exposing the chemically plated catalysts in the corresponding area; and 3) chemically plating copper or nickel and continuing chemical plating and / or electroplating at least once to form a metal layer on the surface of the plastic base. The preparation method provided by the invention has the advantages of simple process, low requirement for energy and low cost. In addition, the chemically plated catalysts are distributed in the plastic base, so theplating layer formed after chemical plating and the plastic base have very high adhesion.

The invention discloses anhydrous tubular metal hypophosphite and a preparation method thereof, and belongs to the technical fields of halogen-free flame retardants and preparation thereof. A molecular formula of the anhydrous tubular metal hypophosphite is M(H2PO2)n, wherein M is any one of Na, K, Ca, Mg, Al, Zn, Mn, Fe, La or Ce; n is 1, 2 or 3. The preparation method comprises the following steps of firstly dissolving a metal chloride, hypophosphorous acid and a surfactant into an organic solvent, then adding into a polytetrafluoroethylene reaction kettle, raising a temperature, reacting, and finally filtering and washing an obtained product. The anhydrous tubular metal hypophosphite provided by the invention has good heat stability, further, does not contain water, cannot cause the degradation of a macromolecular material in a processing process of modifying the macromolecular material, is of a tubular structure, and not only can be used for improving the flame retarding performance of the macromolecular material, but also can be used for ameliorating the mechanical performance of the macromolecular material; the preparation method is simple, and the anhydrous tubular metal hypophosphite is applicable to most macromolecular material, and has a wide market application prospect.

The invention discloses a nitrogen oxide treatment system and a treatment method, comprising a gas mixing adjustment zone, a plasma excitation zone, an SO 2 Absorption zone and NO X Reduction zone, plasma excitation zone, SO 2 Absorption zone and NO X The jacket of the reduction zone is provided with an insulating shell, the gas mixing adjustment zone is provided with an air inlet, NO X The reduction area is provided with an exhaust port; the gas mixing adjustment area is provided with a gas flow rate adjustment pipe for adjusting the intake flow rate of the air inlet, and the gas mixing adjustment area is also connected with an air intake pipe; an insulating pipe is sleeved in the plasma excitation area, and the insulating pipe There is a discharge copper plate opposite to the middle, and a porous drying plate is detachably arranged after the area where the insulating tube is located; SO 2 A porous absorption plate is arranged in the absorption area; NO X The reduction zone is sequentially provided with a porous first catalytic reaction plate, a porous second catalytic reaction plate and a porous drying plate. The treatment device and treatment method of the present invention can treat nitrogen oxides efficiently, and are not easy to SO 2 Poisoning and inactivation.

The invention relates to a cyclic aliphatic carbonate monomer with a triple bond side group, a preparation method and use thereof. 2-methyl-2-propargyl oxygen carbonyl trimethylene carbonate is synthesized from 2,2-dimethylolpropionic acid. The monomer can be used for ring-opening polymerization or ring-opening copolymerization with aliphatic cyclic ester monomer to obtain the aliphatic polycarbonate with triple bond side group or the copolymers of aliphatic polyester-carbonic ester. The polymers have advantages of the aliphatic polyester and carbonic ester, can be biodegradated. The degradation product is non-toxic. The polymers can be used for biomedical material.

The invention discloses a preparation method for plastic products and a plastic product. The method comprises the following steps: 1) forming a plastic matrix, wherein, the plastic matrix is thermoplastic or thermosetting plastic containing chemical plating catalyst precursors which are uniformly distributed in the thermoplastic or thermosetting plastic and are one or more selected from the group consisting of nitrides, borides or phosphides of copper, iron and zinc, nitrides of tin and borides or phosphides of nickel; 2) irradiating a selected area on the surface of the plastic matrix with a laser needle and decomposing exposed chemical plating catalyst precursors to obtain a chemical plating catalyst; 3) carrying out chemical copper plating on the surface of the chemical plating catalyst obtained in step 2) and carrying out at least one more chemical plating and / or electroplating so as to form a metal layer on the surface of the plastic matrix. The preparation method provided in the invention has the advantages of a simple process and low requirements on energy. Furthermore, the bonding force between a coating formed after chemical plating and the plastic matrix is fairly high.

The invention provides a preparation method of a plastic product and a plastic product. The method comprises steps of: 1) moulding a plastic matrix containing a chemical plating catalyst compound with a formula III; 2) removing plastic on a selected zone of the plastic matrix and exposing the chemical plating catalyst on a corresponding zone; 3) carrying out chemical copper facing or chemical nickel plating, continuing to carry out at least one time of chemical plating and / or electroplate to form a metal level on the plastic matrix surface. The preparation method provided by the invention has simple technology, low energy demand and low cost; besides, the chemical plating catalyst is distributed into the plastic matrix, so the coating formed after chemical plating has quite high bondingforce with the plastic matrix.

The invention discloses a wood fiber homogeneous phase transesterification modification method. Wood fibers are dissolved in an ionic liquid, transesterification agents are added to react with the wood fibers, and esterified modified wood fibers are obtained after deposition, washing, filtering and drying. The method is advantageous in that reaction conditions are mild, the technology is simple, the modification efficiency is high, the modification degree is easy to control, catalysts are not needed, products are easy to separate, no acidic by-products are generated during the reaction, degradation of wood fiber components cannot be caused, the employed ionic liquid can be recycled, and the wood fiber substitution degree is easy to control. The provided method has high practicality and good economic prospects.