128 results about "Microbial pollution" patented technology

The invention provides a film forming compound with modified starch as the main component, a film forming material containing the compound, and more particularly a hard-shell natural capsule made from the compound. The compound contains no or very little animal protein such as gelatin, etc. The compound can partially or completely replace the gelatin from animals for producing natural hard-shell capsules. The prepared natural capsule shell product has the advantages of excellent film forming property, high strength, good flexibility, high transparency, decomposability and microbial pollution resistance. The main component of the compound, modified starch, has stable quality and highly controllable performance.

The invention belongs to the preparation field of high molecular functional membrane materials, in particular to a polymer microporous filter membrane with the on-line anti-microbial pollution and self-cleaning functions and a preparation method thereof. The membrane is prepared from a casting solution by the phase inversion method, and can be prepared into a flat membrane or a hollow fiber membrane. The casting solution is composed of polymers, nano oxide particles, a pore forming agent and an organic solvent, and is scraped into the flat membrane by the salivation method or prepared into the hollow fiber membrane through a spinneret, the flat membrane or the hollow fiber membrane is then coagulated in de-ionized water or water solution containing the organic solvent to form a primary membrane, and then the primary membrane is soaked in a weak solvent to obtain the polymer separation membrane with the on-line antibiosis and self-cleaning functions. The membrane has favorable elasticity and mechanical strength, and the surface of the membrane has the antibiosis and self-cleaning functions. Besides, since the pore diameter of the membrane is sensitive to the pressure, the de-ionized water flux and the trapped relative molecular mass of the membrane can be controlled by controlling the operation pressure.

The invention relates to a novel microorganism feed additive, in particular to a microorganism feed additive which contains bacterial strain that can produce conjugated linoleic acid and a preparation method thereof, which belongs to the microorganism feed additive technical field. The preparation method of the microorganism feed additive is that plant lactobacillus and enterococcus faecalis are respectively processed by zymotic liquid which is cultured by liquid deep-layer high-density fermenting and are made into powder by a micro-capsule peridum spray drying method and a frozen-dried preparation method. The microorganism feed additive transforms linoleic acid into the conjugated linoleic acid in the intestinal tracts of poultry and livestock, which takes effects of promoting the growth performance of the poultry and the livestock, reducing fat, increasing meat factor and regulating immunity reaction, etc., and the microorganism feed additive also solves the problem of the high expense caused by adding the conjugated linoleic acid into the feed directly. The microorganism feed additive prepared by the method has the advantages of high viable bacteria content, long holding period and little microbial pollution.

The invention discloses a ZnO-containing chitosan/sodium alginate antibacterial cling film and a preparation method thereof. The preparation method comprises the following steps: preparing ZnO nano particles by taking starch as a dispersing agent and a stabilizer and taking Zn(NO3)2.6H2O as a zinc source; dissolving chitosan in a 1% acetic acid solution, and adding glycerol to prepare a chitosan film solution; dispersing the ZnO nano particles into deionized water, adding sodium alginate and glycerol, carrying out stirring, carrying out ultrasonic dispersion, carrying out standing, and carrying out ultrasonic degassing to obtain a sodium alginate film liquid; and casting the chitosan film liquid into a film, carrying out drying, then casting the sodium alginate film liquid into a film on the surface of the chitosan film, carrying out drying, finally, casting the chitosan film liquid into a film, carrying out drying, and uncovering the film to obtain the antibacterial cling film. The chitosan/sodium alginate/starch-ZnO (CS/SA/SH-ZnO) antibacterial cling film prepared by the method has relatively low water solubility and water vapor permeability coefficient, the antibacterial property is good, and excessive loss of water and microbial pollution in transportation, storage and processing processes of fruits and vegetables can be avoided.

A heat pump-microwave combined drying device comprises a heat pump system, a microwave system and a control system. The heat pump assembly and the microwave system share a drying chamber, the microwave system is installed on the top of the drying chamber, the heat pump system is connected with the drying chamber through a circulating air duct, and the control system is connected with the heat pump system and the microwave system, used for setting and adjusting drying conditions and online monitoring drying parameters, and capable of selecting microwave drying and/or heat pump drying according to the characteristics of materials and finished product requirements so that high water content materials with different shapes and different water contents or under high-humidity conditions can be dried. The heat pump-microwave combined drying device is reasonable in structural layout, easy to use, maintain and repair, uniform in drying, large in processing capacity, efficient, free of microbial pollution and capable of saving energy, the process is advanced, and the quality of dried products is good. The heat pump-microwave combined drying device is especially suitable for drying fruit and vegetables, drying marine products and drying materials which are high in heat sensitivity and prone to oxidization, and applied to the biological industry, the pharmaceutical industry, the chemical industry and the like.

The invention provides an antibacterial composite nanofiltration membrane. The antibacterial composite nanofiltration membrane comprises a porous support membrane bottom layer and an antibacterial surface layer complexed with antibacterial metal ions on the surface. The preparation method of the antibacterial composite nanofiltration membrane comprises the steps as follows: the bottom layer is impregnated with an aqueous phase solution containing aqueous phase monomers, and a bottom layer coated with the aqueous phase monomers is obtained; the bottom layer coated with the aqueous phase monomers is impregnated with an oil phase solution containing oil phase monomers, and a bottom layer coated with the aqueous phase monomers and the oil phase monomers is obtained; the bottom layer coated with the aqueous phase monomers and the oil phase monomers is subjected to thermal treatment, and a composite nanofiltration membrane with a polyamide functional layer is prepared; the composite nanofiltration membrane is impregnated with a metal salt solution containing antibacterial metal ions and the antibacterial composite nanofiltration membrane is obtained, wherein the aqueous phase monomers comprise polyethyleneimine. The antibacterial performance, particularly the microbial pollution resistance, of the antibacterial composite nanofiltration membrane is improved while the high permeabilityis kept; the antibacterial composite nanofiltration membrane has lasting antibacterial performance, long service life and good application prospects.

The present invention relates to a method for resting and evaluating capacity of corrosion prevention system of cosmetic. The invention selects micrococcus pyogenes, bacillus coil, bacillus pyocyaneus, candida albicans, aspergillus niger and salmonella as evaluating strain. The product is grafted into the cosmetic sample solution through the six pathogens and the mixed strains composed of the six pathogens for executing culture experiment. The corrosion prevention capacity of cosmetic is evaluated through comparing and identifying data. The risk resistance capacity of cosmetic for resisting the microbial pollution is effectively evaluated. As the six pathogens have wide representativeness and typical reference value, the six pathogens are used as the typical representative sample strains for evaluating. If the corrosion prevention capacity test is passed, the pollution of product by the microorganism can be effectively prevented, and the possibility of product pollution caused by the reproduction of microorganism can be effectively suppressed. The safety risk caused by product and the cost for frequently executing microbiological examination can be reduced through the basic product formula checked by the corrosion prevention capacity test or all products extended from the basic product formula. The effect is extraordinarily remarkable.

The invention provides a method for developing fruit cakes by utilizing blueberry juice residual residues as a raw material. The method comprises the following steps: directly performing vacuum freezing chopping treatment on frozen blueberry residues without melting and pulping, accelerating the dissolution of active ingredients in a manner of combining ultrasonic emulsification treatment with proper heat treatment, wherein the manner replaces a traditional boiling process, performing high-pressure pasteurization, and finally cooling and molding. Part of macromolecular hydrophilic colloid is added before sterilization, and the gel strength and the shape maintenance are improved. The method is simple to operate, low in heat treatment strength and short in time, and repeated freeze thawing and high-strength heat treatment of a product are avoided. Therefore, the method has the advantages that the microbial pollution probability is low, the retention rate of the effective active ingredients is high, the sensory quality is excellent, the shape maintenance at the temperature of 37-42 DEG C is good and the like.

The invention discloses an environment-friendly alcohol-free fountain solution for offset printing and a preparing method thereof. The solution is prepared from, by weight, 4-7 parts of lauryl polyoxyethylene, 6-8 parts of coconut diethanolamide, 3-5 parts of petroleum sodium sulfonate, 4-6 parts of potassium pyrophosphate, 10-14 parts of trisodium citrate, 8-10 parts of Arabic gum, 4-5 parts of dodecyl polyglucoside, 2-4 parts of hydroxyethyl ethylenediamine, 7 parts of dimethyl dodecyl amine oxide, 2-3 parts of di-o-tolyl-thiourea, 1-2 parts of sodium carboxymethylcellulose, 0.6-0.8 part of methylisothiazolinone, 4-5 parts of Turkey red oil, 0.8-1.2 parts of ethylene diamine tetraacetic acid tetrasodium, 0.6-0.8 part of tea saponin, 3-5 parts of dipropylene glycol methyl ether, 3-4 parts of dodecyl betaine type phosphate, 2-3 parts of sodium hexametaphosphate, and 120-140 parts of deionized water. According to the fountain solution, alcohol of any kinds is not added, no volatile harmful substance is contained, environment friendliness is realized completely, no harm can be done to the human body, a quite strong microorganism killing effect can be realized, microbial pollution of the fountain solution can be controlled and prevented, metal parts can be prevented from being corroded, and a printing plate and a printing machine are prevented from being damaged by early water.

The invention belongs to the technical field of seawater desalination, and particularly relates to an MOF-modified antipollution composite reverse osmosis membrane and a preparation method thereof. The composite reverse osmosis membrane comprises a polysulfone support layer and a desalination layer, the desalination layer is a polyamide composite membrane loaded with a copper-1,4-benzenedicarboxylate metal organic framework material, and the copper-1,4-benzenedicarboxylate metal organic framework material has a pore size of 0.52 nm. The invention also provides the preparation method of the MOF-modified antipollution composite reverse osmosis membrane. The MOF-modified antipollution composite reverse osmosis membrane prepared in the invention effectively reduces organic pollutants adsorbedto the surface of the composite reverse osmosis membrane, and copper ions on the surface of the membrane have a sterilization effect, so that the composite reverse osmosis membrane has the function ofresisting organic pollution and microbial pollution; and the water flux of the composite reverse osmosis membrane increases significantly while keeping the desalination rate unchanged.

The invention discloses a reagent and a kit for quickly detecting microbial pollution of saliva DNA, and applications thereof. The reagent includes a first primer and a second primer. A detection method includes the steps of: 1) providing the reagent or the kit for quickly detecting microbial pollution of saliva DNA; 2) uniformly mixing a to-be-detected saliva DNA sample, the reagent for quickly detecting the microbial pollution of saliva DNA and a regular component for PCR amplification detection, and performing PCR amplification. The reagent has simple configuration, is simple in operation and short in time consumption, is low in cost, is free of special technical training and special instruments and devices, can effectively detect the degree of the microbial pollution in saliva DNA, effectively guarantees reliability of application of a next-generation sequencing targeted capturing technology in medical examination, and greatly reduces experiment and cost risks due to failure of subsequent experiment, which is caused by the microbial pollution of a saliva DNA sample, thereby ensuring that the saliva DNA is used for downstream molecular biological detection.

The invention relates to a new method capable of quickly reducing center temperature of postmortem pig carcass through two-stage cooling. The method comprises the following steps of: in the first stage, placing a pig half carcass, which is slaughtered, cut into a half and washed ultrasonically to reduce bacteria, into a large-scale vacuum cooling machine; starting a refrigerating system and a vacuum pump of the vacuum cooling machine; performing vacuum cooling for 20 to 30 minutes under the vacuum degree of more than 610 Pa, so that the center temperature of the half carcass is reduced to about 20 DEG C quickly; taking out from the vacuum cooling machine; and entering the second stage to perform conventional air cooling, namely cooling in an air cooling storage for 2 to 16 hours under the conditions of temperature of between 0 and 4 DEG C, air speed of about 0.5 to 1 m/s to reduce the center temperature of the half carcass to 0 to 4 DEG C, wherein water supplementation (spraying 1 to 3 percent of cold tap water at the temperature of between 0 and 4 DEG C) is necessary before and after vacuum cooling and in the vacuum cooling process so as to make up for water loss of the pig half carcass in the vacuum cooling process. In the treatment method, the vacuum cooling method adopted in the first stage has the effects of effectively reducing cooling time, saving energy consumption, reducing occurrence rate of pale, soft and exudative (PSE) pork, improving processing efficiency and reducing microbial pollution, so the method is safe, sanitary and environment-friendly.

The invention relates to a bactericidal and preservative agent combination for the repair-regeneration of microbial pollution products, which comprises the following active ingredients: a preservative agent A, a preservative agent B, a bactericide, solvents, additives and water, wherein the preservative agent A is formed by bronopol, the preservative agent B is formed by parachlorometaxylenol PCMX and a phenoxyethanol mixture, and the bactericide is formed by 2,2-dibromo-3-nitrilo-propionamide DBNPA or polyhexamethylene biguanidine hydrochloride PHMB. Through one-time addition, the bactericidal and preservative agent combination disclosed by the invention has strong synergistic, preservative and bactericidal effects, and can concurrently have the functions of bactericidal repair and corrosion and mildew prevention in the period of re-storage, thus most of industrial water-based products metamorphosed by microbial pollution are reused. The bactericidal and preservative agent combination disclosed by the invention has the advantages of reasonable formula, advanced process, high cost performance, low toxicity, good operational feasibility, bactericidal and preservative effect, and the like, and is verified through a lot of industrial practices.

The invention relates to the field of sterile detection, in particular to a fully closed membrane filter for sterile examination of a sterile packaging interlayer and a detection method of the fully closed membrane filter. The fully closed membrane filter comprises two bacterium collecting incubators and an air filter device, wherein the two bacterium collecting incubators and the air filter device are connected to one end of a three-phase circulator by virtue of a conduit; the other end of the three-phase circulator is connected to a sterile sampling needle by virtue of a detection tube; and an intercepting clip is arranged on the part, close to the three-phase circulation valve (the three-phase circulator), of the conduit. By virtue of the fully closed membrane filter disclosed by the invention, secondary pollution on leaching liquor during operating is reduced, a microorganism detection rate is improved and an experimental result is better guaranteed. The circulation of medicine liquid in a sealed space is achieved and the medicine liquid is prevented from getting into contact with external side, so that the fully closed membrane filter plays a great role in the prevention of microbial pollution. Meanwhile, as for operation time, the experimental operation time is shortened by half, the detection efficiency of test article sterile examination is greatly improved, and a detection pollution rate is reduced to be less than 5% from original 20-25%.

The invention relates to a novel saliva preserving fluid comprising the following components: 1-10mmol/L of EDTA, 1-50mmol/L of Tris-HCl, 10-100 mmol/L of sodium chloride; 0.1-3% (w/v) of sodium sorbate, 0.1-3% (w/v) of sodium diacetate, 0.01-0.1% (v/v) of proclin 300, 0.1-1% (v/v) of TWEEN20, 0.1-1% (w/v) of NP40 and 0.1-2% (w/v) of SDS. The novel saliva preserving fluid is used for preservingsaliva samples, can effectively inhibit nuclease activity, prevent microbial pollution, guarantee DNA fragment integrity and purity, simplify pretreatment steps, is suitable for centrifuge-free and low-temperature environments, can guarantee transport stability of samples among different places, and is suitable for molecular epidemiological large-scale population investigation and research.

The invention discloses a processing method of freshly brewed pear wine, which comprises the following steps: selecting fresh pears as raw materials, washing and selecting the pears with excellent quality for secondary washing; crushing and pulping the pears after secondary washing to obtain pear pulp; enzymolyzing the pear pulp; extracting and cleaning juice of the enzymolyzed pear pulp to obtain pear juice; freezing, dehydrating and concentrating the pear juice; fermenting the pear juice; separating wine sediments from the fermented pear juice to obtain bulk pear wine; and clarifying and filtering the bulk pear wine to obtain the finished product of the pear wine. In the method, the raw juice is dehydrated by a freeze concentration technology, thus increasing the sugar content of the pear juice; the pear juice is fermented at a low temperature of not more than 15 DEG C for a short time of about 10 days, thus being beneficial to keeping pear flavor and enhancing typicality of the product; and a small amount of nisin from streptococcus lactis is added to prevent microbial pollution.

The invention provides a coating, comprising the following raw materials in parts by weight: 8-18 parts of water, 0.3-1 part of a dispersant, 1-2 parts of a coalescing agent, 1-4 parts of a moldproof antibacterial agent, 0.1-0.5 parts of a defoamer, 2-5 parts of nanometer antibacterial powder, 6-10 parts of a nano adsorbent, 30-50 parts of styrene-acrylic nanometer emulsion, 5-9 parts of nanometer silicone-acrylic emulsion and 0.1-0.3 parts of a pH modifier. The coating provided by the invention forms a shielding film which is poor in breathability and watertight by the styrene-acrylic nanometer emulsion, escape of a radon gas is prevented, meanwhile, the nano adsorbent can absorb radon ions, escape of the radon gas is further reduced, and the nanometer antibacterial powder and the moldproof antibacterial agent act with each other, so that the coating provided by the invention can effectively reduce the concentration of bacteria, and prevent microbial pollution. Therefore, the coating provided by the invention has the antibacterial and radon-proof functions.

The invention discloses a preparation method of germinated brown rice. The preparation method includes the following steps that (1), brown rice is subjected to sterilization processing; (2), the sterilized brown rice is cleaned and then soaked with water at the temperature of 22-28 DEG C for 3-5 hours; (3), the soaked brown rice is germinated for 48-72 hours under the conditions that the temperature is 26-30 DEG C, and relative humidity is larger than 95%; (4), the germinated brown rice is dried, and the germinated brown rice is obtained. According to the preparation method of the germinated brown rice, the brown rice is soaked and germinated after being subjected to sterilization processing, and finally the germinated brown rice is obtained after being dried. By means of the preparation method of the germinated brown rice, the pigment loss can be reduced, microbial pollution is lowered, the content of FAAs is improved, and nutrition quality is improved.

The present invention is directed to a face mask comprising a multi-layer filter material. One or more antimicrobial and/or hydrophilic and/or stain release agents are adhered to a textile material that forms the outer layers of the multi-layerfilter material. The agent(s) is/are adhered to the textile material in such a manner that they are not released from the textile material even if the facemask is washed, so that the face mask as such is re-usable. The particular arrangement of textile layers of the face mask according to the present invention also allows that the face mask can be washed. That is, the textile and the overall structure of the face mask is preserved albeit the physical stress applied during washing. In preferred embodiments, where one or more antimicrobial agents areadhered to the textile material, the face mask can be used to protect the wearer against airborne particulate and microbial pollution, and, in particular, sanitize the inhaled air. Likewise, the environment, such as other persons, are protected from particles and microbes that are exhaled by the wearer of a face mask according to the present invention. Washability and/or usability of the textile material within the multi-layerfilter material of the face mask is/are improved when one or more hydrophilic and/or stain release agents are adhered to the textile material, which is particularly advantageous to ensure that the face mask is rendered as clean as possible during wash, i.e. that absorbed or adsorbed stains are released from the textile. The invention further relates to a method of finishing a textile material by applying and binding antimicrobial and/or hydrophilic and/or stain release agents to the textile material so that the agents are essentially irreversibly adhered to the finished textile material.

The invention provides a microbial pollution source tracing method. The method comprises the following steps: determining each suspicious pollution link of a polluted product, and respectively carrying out sampling to obtain a plurality of samples to be analyzed; determining corresponding culture conditions according to the environment where each sample to be analyzed is located, and culturing microorganisms in each sample to be analyzed according to the determined culture conditions to obtain corresponding purified single colonies; performing mass spectrometric analysis on each single colonyby using a matrix-assisted laser desorption ionization-time-of-flight mass spectrometer to obtain spectrogram data of each single colony and identify species information of each single colony; determining species distribution information of microorganisms in each sample to be analyzed according to the species information of each single colony; and analyzing and comparing the species distribution information of the microorganisms of the polluted product with the species distribution information of the microorganisms of each suspicious pollution link, and determining a pollution source accordingto an analysis result. According to the invention, microbial pollution source tracing can be rapidly and efficiently realized.

The invention discloses a vacuum coupling steam enzyme deactivation drying device with a solar auxiliary heat pump for flos chrysanthemi. The vacuum coupling steam enzyme deactivation drying device comprises a solar hot-water system, a heat pump system, a vacuum system, a steam enzyme deactivation system, a control system, a spiral tube heat exchanger, a gas heater and a gas drying tower, whereinthe heat pump system, the vacuum system and the steam enzyme deactivation system shares the same drying box. The vacuum coupling steam enzyme deactivation drying device can be used for forming the advantage complementary integration of two methods of solar auxiliary heat pump drying and vacuum drying; the drying processes of the saturated steam enzyme deactivation, the heat pump drying, the softening and the vacuum drying of the flos chrysanthemi are realized; meanwhile, essential oil volatilized in the drying procedure of the flos chrysanthemi is recovered. The vacuum coupling steam enzyme deactivation drying device is energy-saving and high-efficiency, is uniform in drying and has no microbial contamination; a dried product of the flos chrysanthemi is high in quality; the visual real-time monitoring can be realized and the economic value of the flos chrysanthemi is furthest utilized.