13 results about "Cellulose formation" patented technology

The invention relates to a method for preparing a spherical solidified tannin germanium precipitation agent by utilizing agriculture and forestry solid wastes, and belongs to the technical field of functional materials. The agricultural and forestry solid waste is sequentially subjected to pretreatment, hemicellulose removal and lignin removal to prepare high-purity cellulose, epoxy chloropropane is utilized for bridging cellulose and hexaalkyl diamine, and a section of flexible chain is introduced into the cellulose; the preparation method comprises the following steps: adding a hydrophobic organic solvent paraffin and TA-alkylamino cellulose to form a water-in-oil (W / O) system, promoting the immobilized tannin to form easily filtered spheres, adding span80 to avoid system emulsification, and adding epoxy chloropropane, bridging TA and alkylamino cellulose to prepare the spherical immobilized tannin germanium precipitation agent. The cellulose purity can reach 95% or above, and high-quality utilization of solid waste is achieved; in the spherical solidified tannin germanium precipitation agent, the steric hindrance of tannin molecular activity is small, the activity is high, the germanium precipitation rate of solidified tannin after 10 times of circulation can still reach 96.50%, and the tannin consumption required by precipitation of kilogram of germanium is reduced to 0.105 kg / kg and is reduced by 99.65% compared with the tannin consumption of existing industrial germanium precipitation.

The invention relates to the technical field of general papermaking, in particular to tipping paper for laser transfer cigarettes and a processing method thereof.The tipping paper for the laser transfer cigarettes is used for tobacco products and comprises a first body paper layer, a pattern layer, at least one reinforcing layer and at least one second body paper layer; the first body paper layer and the pattern layer are outer layers of the tipping paper, the first body paper layer is in direct contact with a cigarette holder of the tobacco product, and the first body paper layer or the second body paper layer contains cellulose; the reinforcing layer is arranged between the first raw paper layer and the second raw paper layers and / or between the two second raw paper layers, the reinforcing layer is of a net structure, and a substance forming a hydrogen bond with cellulose is arranged in the reinforcing layer; the pattern layer is arranged on one side of the second body paper layer, and the pattern layer comprises laser patterns.

The invention discloses a method for preparing a bacterial cellulose-cyclodextrin compound based on a pH-shift hydrogen bond switch. Bacterial cellulose is pretreated through an alkali-urea system to form an alkali swelling state, and hydrochloric acid is used for regulating the pH value of the system to trigger a hydrogen bond switch: under the alkaline condition, cellulose hydroxyl and alkali urea form a hydrogen bond to realize dissolution, and under the acidic condition, the hydrogen bond breaks to promote polymerization and sedimentation of cellulose; meanwhile, new hydrogen bond grafting wrapping is formed between cyclodextrin and cellulose through pH gradient change induction. The prepared compound cyclodextrin has the good biocompatibility and mechanical strength of the bacterial cellulose and the inclusion characteristic of cyclodextrin, has wide application prospects in the fields of biomedicine, food, materials and the like, is stable in structure and provides a new path for preparation of cellulose-based functional materials.

A method for increasing lignocellulosic carbon microporous and mesoporous based on solvent permeation, characterized by comprising the following steps: cutting wood into thin slices of a predetermined size, and performing thermal modification; soaking the wood slices pre-carbonized in step 1) in a polar solvent for 6-10 hours, and ultrasonic oscillation; the polar solvent includes acetone, ethanol, petroleum ether, ethyl acetate, methanol and water; soaking the slices treated in step 2) in a polar solvent for 8-20 hours; drying; calcining the dried wood slices in a protective atmosphere to form lignocellulosic carbon. In the present application, the cellulose / hemicellulose in the cell wall is initially pyrolyzed by thermal modification to form a cutin layer, and then the porosity of the thermal modified wood cell wall is improved by the similar phase solubility and permeation of the polar small molecule solvent, and finally the microporous / mesoporous volume of the wood-derived carbon cell wall is simply and efficiently improved.

This invention relates to the field of pharmaceutical technology, specifically to a sustained-release tablet of dihydroergot mesylate with composite network regulation and its preparation method. The sustained-release tablet comprises a composite structure consisting of a drug-resin composite core, an inner interface regulation structure, and an outer composite network. The key to its preparation lies in: forming a wet complex of dihydroergot mesylate with a strongly acidic cation exchange resin; sequentially introducing low-viscosity hydroxypropyl methylcellulose and a first portion of ethyl cellulose to construct the inner interface regulation layer; and after semi-drying, adding high-viscosity hydroxypropyl methylcellulose and a second portion of ethyl cellulose to form the outer composite network framework. This structure can significantly inhibit the burst release of the drug in gastric juice and achieve a stable and sustained release in intestinal juice, with stable tablet quality and good industrialization prospects.

The invention relates to a method for preparing cured tannic acid through a radiation initiation method, and belongs to the technical field of functional materials. The preparation method comprises the following steps: preparing spherical cellulose by utilizing a soft template method, forming a water-in-oil (W / O) system by hydrophobic organic solvent paraffin and cellulose, adding span80 to avoid layering and agglomeration of water-phase liquid drops in an oil phase so as to form the spherical cellulose, and adding ultrasonic energy to promote the cellulose to form a porous spheroid; cellulose is radiated to obtain cellulose containing a carbon center free radical, when the free radical is in contact with GMA (glycidyl methacrylate), the carbon center free radical is in contact with C on the GMA to generate bridging reaction, the GMA can be connected to the cellulose only through one step, and the GMA has double effects of bridging and epoxy activation, so that the GMA can be used for preparing a high-temperature-resistant epoxy resin material for the high-temperature-resistant epoxy resin material for the high-temperature-resistant epoxy resin material for the high-temperature-resistant epoxy resin material. And the tannic acid can be connected without other reagents to prepare the cured tannic acid. The method is simple, the grafting rate is high, the tannic acid content in the formed cured tannic acid can reach 20 wt.%, and the adsorption equilibrium amount of the cured tannic acid to germanium can still reach 9.97 mg / g after the cured tannic acid is circulated for 10 times.

The application discloses a kind of bifunctional carbon-based catalyst and its application, the bifunctional carbon-based catalyst of the particle size 1nm-7 μm boron-carbon-based microspheres, with furan boronic acid and methylglyoxal as raw material to prepare by hydrothermal co-carbonization reaction.It is with methylglyoxal and furan boronic acid mixture as composite functional carbon source, by one-step hydrothermal co-carbonization method synthesized with strong adsorption boron hydroxyl and in-situ carboxyl bifunctional carbon-based catalyst.Boron hydroxyl is adsorption site, by with cellulose form chemical bond force to improve the mass transfer efficiency of catalyst and cellulose;With in-situ carboxyl as catalytic site, break glycosidic bond, can realize cellulose to glucose efficient conversion in pure aqueous phase.In addition, the bifunctional carbon-based catalyst of the application has excellent hydrothermal stability and repeatability in catalyzing cellulose conversion, solvent system is water, more economical, green, safe.

The invention provides a tacrolimus multi-layer coated pellet capsule and a preparation method of the tacrolimus multi-layer coated pellet capsule. The tacrolimus multi-layer coated pellet capsule is characterized by comprising an inner core pellet, a middle coating layer and an outer coating layer, the core pellet is prepared from tacrolimus, high molecular weight ethyl cellulose with the molecular weight of 100000 to 300000Da, a disintegrating agent and a filling agent; the middle coating layer comprises medium molecular weight ethyl cellulose with the molecular weight of 30000 to 50000 Da; the outer coating layer comprises low molecular weight ethyl cellulose with the molecular weight of 1000 to 10000 Da and a release accelerator. Through the innovative design of a three-layer coating structure, the multi-stage release characteristic of tacrolimus is realized. The core pellet adopts high-molecular-weight ethyl cellulose as a base material to provide a drug sustained release basis; the middle coating layer is made of medium-molecular-weight ethyl cellulose, so that a stable membrane-controlled release layer is formed, and the drug release rate is accurately controlled; and the outer coating layer adopts low-molecular-weight ethyl cellulose to be matched with a release accelerator, so that the quick release of the medicine is realized.

This invention provides a method for preparing a bifunctional mesoporous solid acid catalyst and its application in the hydrolysis of cellulose to produce glucose. Using alkali lignin as the carbon source and sucralose as the chlorine source, the bifunctional mesoporous solid acid catalyst is obtained after high-temperature carbonization and concentrated sulfuric acid sulfonation. This catalyst not only possesses a high density of -SO3H groups, enabling efficient cleavage of cellulose glycosidic bonds, but also exhibits -Cl groups that can form hydrogen bonds with cellulose, enhancing the catalyst's adsorption capacity for cellulose polysaccharides. When the prepared catalyst is used for cellulose hydrolysis, it can efficiently convert cellulose into glucose at a temperature of 150–190 °C for 2–6 h. It exhibits advantages such as high catalytic efficiency, few byproducts, and low corrosiveness to equipment, making it an environmentally friendly solid acid catalyst.

The present invention discloses a method for packaging cut meat for freshness preservation. The packaging method for cut meat for freshness preservation according to the present invention is a packaging method for cut meat for freshness preservation, comprising: (a) cold A step of forming a coating film having a thickness of 0.01 to 0.2 mm by applying a natural polymer compound, composed of one or more of agar, gelatin, cellulose, starch, and protein, to the surface of the cut meat; (b) the above It consists of a packaging step for packaging cut meat with a coating film formed thereon. The packaging method for cutting meat for freshness preservation according to the present invention, configured as described above, applies agar to the surface of the cut meat, Form a coating film by applying natural polymer compounds such as gelatin, alginic acid, starch, other polysaccharides, starch, and cellulose. It lowers the production of basic nitrogen by blocking the cell membranes on the surface of the meat from the outside through simple process improvements, and at the same time, microorganisms It has the advantage of being able to suppress spoilage caused by water proliferation. In addition, natural polymer compounds can maintain freshness and suppress browning by blocking the cell membranes on the surface of the meat. Since this can guarantee excellent appearance and taste for meat products that prioritize sensory elements, it enhances marketability. Useful effects are expected. In addition, since it can be distributed and displayed in a state highly preferred by consumers, consumer satisfaction with the product can be further enhanced. It has an effect.

Provided herein are compositions and methods for engineering a bacterium comprising a reduced capacity for cellulose formation, a reduced capacity for foaming behavior, or an increased capacity for cell density for enhancing bioprocessing outcomes associated with the fermentative production of industrially relevant bioproducts.

Provided herein are compositions and methods for engineering a bacterium comprising a reduced capacity for cellulose formation, a reduced formation, a reduced capacity for foaming behavior, or an increased capacity for cell density for enhancing bioprocessing outcomes associated with the fermentative production of industrially relevant bioproducts.

The invention relates to a long-acting antibacterial and anti-algae waterproof coating for a drinking water pool, the long-acting antibacterial and anti-algae waterproof coating for the drinking water pool comprises a liquid material and a powder material, the liquid material comprises an organic silicon emulsion, modified organic silicon, color paste, an anti-algae agent, an antibacterial agent, an auxiliary agent and water, and the powder material comprises an organic silicon emulsion, modified organic silicon, color paste, an anti-algae agent, an anti-bacterial agent, an auxiliary agent and water. The powder comprises white cement, quartz sand, PP fibers, cellulose and a water reducing agent. On the basis of compounding modified organic silicon obtained by reacting a reaction product of vinyl hydrogen-containing silicone oil and allyl glycidyl ether modified chitosan with N, N-methylene bisacrylamide, styrene and butyl acrylate with an organic silicon emulsion, an antibacterial agent, an anti-algae agent and an auxiliary agent are matched, so that antibacterial and anti-algae functions and system stability are realized; the powder is cooperated with the quartz sand through the white cement, a ventilation channel is constructed by means of the quartz sand, the waterproof performance is guaranteed through the cement, a three-dimensional toughening network is formed through the PP fibers and the cellulose, and the constructability and the coating compactness are optimized in cooperation with the water reducing agent.