69results about How to "High elution rate" patented technology

The invention relates to graftable polymers comprising biologically active agents and the use of such polymers in the manufacture of shaped articles, such as implantable medical devices and catheters. The graftable polymers are covalently grafted to a surface via one or more grafting moieties incorporated into the pharmaceutically-active graftable polymer. The coated articles of the invention can further comprise tie-coats, and the ratio of polymer:tie coat can be used to adjust the rate of drug elution.

The invention relates to a method for extracting rose flavone from a rose residue solution. The method comprises the following steps: (1), filtering the rose residue solution, concentrating, adding ethyl alcohol to adjust the pH value of the solution, refrigerating and standing in the absence of light; (2), performing suction filtration on the solution in the step (1), and concentrating, so as to obtain rose flavone pigment coarse powder; (3), performing separation and purification on the rose flavone pigment coarse powder obtained in the step (2), so as to obtain eluant; (4), concentrating and drying the eluant, so as to obtain dry flavone. According to the invention, the flavone extraction ratio reaches above 8% to the maximum extent, and is greatly improved compared with the flavone extraction ratio being not higher than 5% in the prior art; the obtained flavone is bright red in color, and can be widely applied to the fields of medicine and food.

The invention discloses a rapid and automatic determination method and device for tripolycyanamide content in dairy products, belonging to the field of food analysis. The method comprises the following steps that: in a unit (A) under an operating procedure, a first step, a multifunctional valve is in a state I, a pump A rotates, a pump B stops, a first sample flows into a column 2 for enriching tripolycyanamide, and the eluent flows into a column 1 for regenerating tripolycyanamide; a second step, the pump A stops, the pump B rotates, the cleanout fluid flows into the column 2 for cleaning the impurities therein; a third step, the multifunctional valve is switched to a state II, eluent flows into the column 2 for eluting and regenerating tripolycyanamide; the tripolycyanamide in the column 2 is substituted by the eluent and directly enters into a sampling ring of a unit (B) in the form of a sample plug, so as to perform volume quantification, injection, re-separation and detection, and a response signal is processed by a computer; and meanwhile, a second sample enters into the column 1 for enrichment, and the process of the column 2 is repeated. The method and the device are high in automation degree and excellent in reproducibility, and can analyze about 30 samples per hour; and the unit (A) in the invention can be used with various flow injection analysis systems.

The invention discloses a regenerative adsorption material for quickly adsorbing and removing organic micro-pollutants in water and a method for preparing the regenerative adsorption material. The method includes carrying out reaction on graphite fluoride which is used as a raw material to obtain graphene fluoride; carrying out reaction on FeCl2 4H2O and FeCl3 6H2O which are used as raw materialsto obtain magnetic iron nano-particles; carrying out mild modification on the basis of the graphene fluoride by the aid of the magnetic iron nano-particles to obtain the adsorption materials for adsorbing and removing the persistent organic micro-pollutants perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) in real environmental water (lake water, river water and tap water). The regenerative adsorption material and the method have the advantages that the regenerative adsorption material is high in PFOA and PFOS adsorption speed and efficiency and easy to separate and recycle and can be reused, regeneration procedures are simple, and accordingly the regenerative adsorption material and the method have high application values.

The invention relates to a low-sugar rice making method of a cooking utensil, which at least comprises the following stages: a, a starch elution stage: performing soaking for time t1 at 50-65 DEG C, performing heating to 70-90 DEG C, performing maintaining for time t2, and discharging water to separate rice from water; and b, a cooking stage: heating and cooking or steaming the rice subjected to starch elution. Compared with the prior art, the cooked rice is good in taste and low in sugar content.

The invention relates to a method for removing nitrate and nitrite during cucumber clear juice processing. The method comprises the following steps: crushing to prepare cucumber pulp, squeezing to prepare cucumber normal juice, carrying out enzymolysis and centrifugal treatment on the cucumber normal juice to obtain cucumber clear juice, adding active carbon in the cucumber clear juice to carry out stirring adsorption, carrying out ultrafiltration, heating to 45-50 DEG C, obtaining clarified cucumber clear juice through a resin adsorption column, and carrying out vacuum concentration, sterilization and filling on the cucumber clear juice to obtain the nitrate and nitrite removed cucumber clear juice. According to the method, macroporous resin is used for adsorbing the nitrate and nitrite in the cucumber juice during cucumber clear juice processing, so that the removal cost is low, the efficiency is high and the quality index of the domestic and export fruit and vegetable juice can be fully satisfied; meanwhile, the macroporous resin can be repeatedly used through elution, and the elution rate is up to above 90%.

The invention discloses a method for detecting norovirus in a food based on negatively charged membrane concentration. The method comprises the following steps: immersing a sample to be detected in an eluant, carrying out oscillation elution at room temperature, and centrifuging the above obtained solution to obtain a supernatant; adjusting the pH value of the supernatant to 2-4, and carrying out suction filtration by using a negatively charged filter membrane with the aperture of 0.45 [mu]m to obtain suction-filtered filter paper; and shearing the suction-filtered filter paper, extracting RNA, carrying out a real-time quantitative PCR to obtain the Ct value of the sample to be detected, and finally obtaining the content of the norovirus in the sample to be detected according to a norovirus NoV GI standard curve and a norovirus NoV GII standard curve. Compared with existing local standard (DBS13/001-2015), the method has the advantages of time saving, high efficiency, and increase of the virus enrichment rate by 5-10%.

The invention provides a method for preparing scandium hydroxide through scandium-containing waste titanium acid liquor and relates to extraction technologies. The method specifically comprises the following steps that clear liquor is obtained after suspended solids and large-grained impurities of the scandium-containing waste titanium acid liquor are removed; the clear liquor is extracted, and scandium-titanium organic phases enriched in scandium and titanium are obtained; the scandium-titanium organic phases are eluted through an eluent, organic phases with titanium being removed are obtained, and an aqueous solution composed of hydrogen peroxide and substances containing phosphate radicals is used as the eluent; and the organic phases are subjected to reverse extraction treatment, and scandium hydroxide is obtained through separation and recovery. Compared with the method that in the prior art, titanium is removed through reextraction and a mixed solution which is composed of sulfuric acid and hydrogen peroxide and used as an eluent, the hydrogen peroxide aqueous containing phosphate radicals is used as the eluent for directly eluting titanium, the technological process is greatly shortened and simplified, the scandium titanium separation efficiency is high, and the cost is low.

The invention relates to an adsorption and elution method used in gas chromatography-mass spectrometer (GC-MS) analysis and sample preparation of water trace polychlorinated biphenyls and belongs to the field of analysis and testing. The adsorption and elution method aims at solving the problems that the existing method for eluting a target object in a GC-MS analysis and sample preparation program of water trace polychlorinated biphenyls is not satisfactory. The adsorption and elution method comprises the steps of a, inserting a rod-shaped or needle-shaped ultrasonic probe into a cavity of a needle cylinder, and radiating ultrasonic wave to the area where adsorbent is positioned in the cavity of the needle cylinder, wherein the frequency of the ultrasonic wave ranges from 100KHz and 12MHz; and b, intermittently communicating a filter of the needle cylinder with a negative pressure source for suction filtration for 0.05 minutes to 30.00 minutes every other 0.05 minutes to 30.00 minutes when the rod-shaped or needle-shaped ultrasonic probe continuously and uninterruptedly radiates the ultrasonic wave to the area where the adsorbent is positioned in the cavity of the needle cylinder. The mechanism of the adsorption and elution method is that the ultrasonic wave promotes desorption and mass transfer before the suction filtration and stops re-adsorption during the suction filtration.

Provided are a C-shaped composite fiber, a C-shaped hollow fiber using the same, a fabric including the C-shaped composite fiber and/or the C-shaped hollow fiber, and a manufacturing method of the C-shaped composite fiber, the C-shaped hollow fiber, and/or the fabric, and more particularly, to a C-shaped composite fiber which has excellent strength and elongation together with improved hollowness, so that there is little deformation of the composite fiber and/or the hollow fiber in the manufacturing process thereof, quality degradation of the hollow fiber is minimized in the elution process thereof, a weight reduction process in a fabric state is not required when manufacturing the fabric, and the manufactured fabric has excellent warmth and lightness, a C-shaped hollow fiber using the same, a fabric including the C-shaped composite fiber and/or the C-shaped hollow fiber, and a manufacturing method of the C-shaped composite fiber, the C-shaped hollow fiber, and/or the fabric.

The invention relates to a method of separating yellow substance from sea water by enrichment. Take macro reticular resin as adsorbent; adjust the pH of the sea water after filtration to acidic property using hydrochloric acid; crawl the sample on the pump; elutriate it by organic reagent; rotatory evaporate the eluent or purge it by nitrogen; remove organic reagent; get the aqueous solution of yellow substance after ultra-pure water dissolution; freeze-dry the aqueous solution to get its dry power; or reseperate the aqueous solution by jel pole to get yellow substance component with molecular weight in different range; said macro reticular resin are selected to use the type of LSA-20, XAD-8 and so on; eluent are selected to use organic reagent of chromatogram pure such as methyl alcohol, alcohol; said gelatin are selected to use the type of G-25, G-50. The invention provides abundant adsorbing medium which can adsorb CDOM selectively and largely with fast sampling rate, simple operation which is easy to control, high elution rate, and can get large quantity of yellow substance from sea water.

The invention relates to the technical field of polyphenol extraction, especially to an extraction method for hyperglycemic longan seed polyphenol. The method includes the steps of: (1) cleaning and drying longan seeds; (2) crushing the dried longan seeds to obtain longan seed powder; (3) adding water into the longan seed powder to make a pulp, then adding alpha-amylase for enzymolysis, thus obtaining a primary enzymolysis product; (4) adding cellulose into the primary enzymolysis product for enzymolysis, thus obtaining an enzymolysis product; (5) adding a sodium sulfate solution into the enzymolysis product, stirring the substances evenly, and then conducting microwave extraction so as to obtain leachate; (6) subjecting the leachate to filtration under reduced pressure and drying the extracted liquid, thus obtaining a longan seed polyphenol crude extract; (7) adding water into the longan seed polyphenol crude extract to prepare a solution, and letting the solution pass through macroporous resin for adsorption; and (8) filtering the adsorbed resin, using 35% ethanol to perform elution, concentrating the eluent and then performing drying, thus obtaining a polyphenol extract. The method provided by the invention can effectively extract the hyperglycemic polyphenol component from longan seeds.

The invention discloses a filtering cloth detergent and a cleaning method thereof. The filtering cloth detergent comprises the following raw materials in percentage by mass: 2-15% of hydrochloric acid, 2-8% of oxalic acid, 1-15% of sodium dodecyl sulfate and the balance of water. In a mode of low-pressure internal circulation mode of a filter press, filtering cloth sticking substances are washed off with the filtering cloth detergent in an active decomposition manner, the liquid permeation rate can be increased, the service life of filtering cloth can be prolonged, the energy consumption can be reduced, and the productivity can be improved.

The invention relates to a chelate resin and a preparation method and application thereof, wherein the chelate resin has the following structure: in the formula, R is selected from any one or more of H, alkyl or alkoxy containing C1-C10 straight chains or branched chains, chlorine and bromine, R1 is selected from (CH2) nOH, R2 is selected from (CH2) nCOOH, and n is 0-3 and represents a chloro-sphere; Compared with the prior art, the synthesized novel chelate resin product can effectively remove metal impurities such as nickel, cobalt, manganese, calcium, magnesium, iron, zinc and copper in metal wastewater under different acidity, the removal rate reaches up to 99%, and the chelate resin can be used for purifying water or treating wastewater containing metal ions.

The invention relates to a preparation method of an environment-friendly corrosion and scale inhibitor for sewage treatment. The environment-friendly corrosion and scale inhibitor is prepared from thefollowing raw materials: distilled water, carbon disulfide, an oxidant, chloroacetic acid, sodium humate, ferric chloride, dithiocyano-methane, modified bentonite, 2-phosphonobutane-1,2,4-tricarboxylic acid, barium zirconate titanate (BZT), starch, maleic anhydride, sodium fluoride, dibasic acid and sodium carbonate; the COD removal rate of the corrosion and scale inhibitor is 86-94%, the scale inhibition rate of the corrosion and scale inhibitor for calcium carbonate scale reaches up to 99-99.4%, the scale inhibition rate of the corrosion and scale inhibitor for strontium sulfate scale is 99.3-99.7%, the BOD removal rate of the corrosion and scale inhibitor is 92-98%, the chromium ion removal rate of the corrosion and scale inhibitor is 99.5-99.9%, the scale removal rate of the corrosionand scale inhibitor is 78-82%, the chemical feeding period is 10-14 days, the phosphorus elution rate of the corrosion and scale inhibitor reaches up to 99.4-99.8%, the paraffin control rate of the corrosion and scale inhibitor is 83-87%, the carbon steel corrosion rate of the corrosion and scale inhibitor is 0.002-0.004mm/a which is far better than the international standard of 0.005mm/a, and the carbon steel corrosion inhibition rate of the corrosion and scale inhibitor is 90-96%.

The present invention relates to methods and additives for increasing active agent elution rates from elution control coatings and elution control coatings including the same. In an embodiment the invention includes an elution control coating comprising a polymeric matrix and at least about 0.1 wt. % of an additive dispersed within the polymeric matrix. The additive can include polyvinylpyrrolidone or a copolymer thereof. An active agent can be dispersed within the polymeric matrix, the active agent having limited solubility in water. Embodiments of the invention also include a method of forming an elution control coating with accelerated release kinetics. Other embodiments are also included herein.