15 results about "Dialdehyde starch" patented technology

The invention discloses a method for improving the anti-oxidation characteristic of a soybean whey protein-dialdehyde starch composite film by using chlorogenic acid, and belongs to the technical field of food processing. The preparation method comprises the following steps: step 1, preparing soybean whey protein; step 2, preparation of dialdehyde starch; 3, preparing a film forming solution; and step 4, preparing the soybean whey protein-dialdehyde starch composite film added with chlorogenic acid. The chlorogenic acids with different concentrations are added into a soybean whey protein-dialdehyde starch solution to prepare the composite membrane, and the influence of the chlorogenic acids with different concentrations on the antioxidant property of the soybean whey protein-dialdehyde starch composite membrane is comprehensively evaluated by measuring the ABTS < + > and DPPH free radical scavenging rates of the composite membrane. And a theoretical basis is provided for improving the comprehensive performance of the edible film and promoting the application of novel food packaging. Comprehensive analysis shows that along with the increase of the concentration of the added chlorogenic acid, the anti-oxidation characteristic of the composite membrane is gradually enhanced, and the chlorogenic acid can effectively improve the anti-oxidation characteristic of the composite membrane.

The invention belongs to the technical field of polymer composite materials, and particularly relates to composite aerogel with an excellent fresh-keeping effect and a preparation method and application of the composite aerogel. The preparation method of the composite aerogel comprises the following steps: S1, uniformly mixing a gelatin solution and a dialdehyde starch solution, and stirring at 30-40 DEG C for 60-90 minutes until the viscosity of a system is increased by 20-30%; s2, adding a bamboo nano cellulose solution, and reacting at 85-110 DEG C to obtain a gel precursor solution; s3, freezing and drying the gel precursor solution to obtain composite aerogel; in the step S1, the pH value of the system after the gelatin solution and the dialdehyde starch solution are mixed is 4.0-5.0. According to the preparation method, the bamboo nanocellulose is introduced after the gelatin and the dialdehyde starch are subjected to pre-reaction, so that the problem of non-uniform crosslinking in the prior art is avoided. The composite aerogel prepared by the invention has higher structural stability and better cushioning performance.

The invention discloses a preparation method for optimizing the flavor of illicium verum wine through synergy of biotransformation and alcohol reduction, and belongs to the technical field of wine preparation. The method comprises the following steps: mixing illicium verum essential oil, a sugar donor, an immobilized enzyme preparation and a wine base, and catalyzing ethanol and the sugar donor to generate glucoside conversion reaction by using alpha-glucosidase under a control condition. The immobilized enzyme preparation is prepared by taking nano cellulose as a core carrier, coating the core carrier with hydrophilic polymer polyvinyl alcohol (PVA) to form a shielding layer, modifying chitosan, crosslinking and activating dialdehyde starch, and covalently coupling glycosidase. By utilizing the synergistic effect of enzymatic glucoside conversion and physical volatilization, the alpha-ethyl glucoside with a healthy function is generated while the alcoholic strength is reduced, and acetic acid accumulation caused by traditional oxidative alcohol reduction is avoided; meanwhile, the PVA hydrophilic shielding layer effectively blocks non-specific adsorption of the carrier to the hydrophobic star anise essential oil, so that the retention rate of flavor substances is increased, and the problems of boring flavor and rancidity of mouth feel are solved.

The application discloses a gelatin-bacteriocin amino acid-dialdehyde starch composite film and a preparation method and application thereof. The preparation method of the composite film comprises the following steps: adding a crosslinking agent into a gelatin solution, adding N-hydroxysuccinimide into the gelatin solution after activation for a set time, then adding bacteriocin amino acid into the gelatin solution, coupling for a set time under weak acid condition and in the dark, and obtaining Gel-MAAs; dissolving the Gel-MAAs in water to obtain a composite solution; dissolving dialdehyde starch in water, gelatinizing, adjusting to weak alkalinity, and obtaining a dialdehyde starch solution; adding the dialdehyde starch solution into the composite solution, mixing uniformly, reacting at 35-45 DEG C for 1-3 h, adding glycerol with a mass fraction of 1-5%, ultrasonic degassing, pouring the film solution into a mold, and drying, and thus the composite film is obtained. The composite film has excellent mechanical properties, physicochemical properties, ultraviolet resistance, good biocompatibility, and great potential in the field of active composite films.

The application relates to the technical field of drug carrier materials, in particular to a starch-based capsule and a preparation method thereof, which comprises the following steps: S1, after dialdehyde starch is gelatinized, the dialdehyde starch is mixed with a tannic acid solution, an iron chloride solution is added, uniform mixing and defoaming are carried out, and a film-forming solution is obtained; S2, a mold is immersed in the film-forming solution, preliminary drying is carried out under a set temperature and humidity condition after pulling up, and a gel film layer is formed; S3, the gel film layer after preliminary drying is demolded, humidity balance and drying are sequentially carried out, and the starch-based capsule is obtained. By adding tannic acid and a suitable amount of iron chloride, an effective crosslinking network structure is formed among starch molecules, the mechanical strength of the capsule shell is enhanced, and the hygroscopicity is reduced.

The invention provides a bone adhesive as well as a preparation method and application thereof, and belongs to the technical field of medical bone adhesives. The bone adhesive provided by the invention comprises isinglass, polyphenol and dialdehyde starch, the mass ratio of the isinglass to the polyphenol to the dialdehyde starch is (1-5): (0.2-2): (0.1-10). The bone adhesive provided by the invention is formed by crosslinking the isinglass, the polyphenol substance and the dialdehyde starch, has the advantages of good bone adhesiveness, high strength, good biocompatibility and degradability, can adhere fracture fragments, and provides a new strategy for fracture repair.

The application discloses a modified starch-based petroleum drilling aid and a preparation method thereof, and comprises the following steps: S1, oxidizing dialdehyde starch into polycarboxyl starch by using sodium chlorite; S2, performing esterification treatment on the polycarboxyl starch, and then performing amidation reaction on the polycarboxyl starch and sodium p-aminobenzenesulfonate; S3, performing reduction treatment on the amide bond by using a reducing agent; and S4, performing lipolysis on the starch after the reduction treatment to obtain the modified starch. The modified starch prepared by the application can greatly improve the temperature resistance and salt resistance by grafting a large number of rigid benzene rings and hydration groups, and has excellent effects of increasing viscosity, improving cutting and reducing filtration loss.

The invention discloses a paper pulp reinforcing agent for tea filter paper production and a preparation method thereof. The reinforcing agent is prepared from the following raw materials in parts by weight: 1 to 10 parts of cationized tannin, 2 to 25 parts of dialdehyde starch, 0.1 to 5 parts of aldehyde group binding agent, 0.05 to 2 parts of pH (Potential of Hydrogen) regulator and 60 to 95 parts of water. The preparation method comprises the following steps: performing cationization modification on natural tannin to obtain a cationized tannin solution; oxidizing starch with periodate to obtain dialdehyde starch; and mixing the two components with an aldehyde group binding agent and a pH regulator, and regulating the pH value to 4.0-6.5 to obtain the reinforcing agent. The cationized tannin is adsorbed on the surfaces of the fibers through electrostatic interaction, the dialdehyde starch is crosslinked with the tannin and the fibers through aldehyde groups, and the dry strength and the wet strength of the paper are remarkably improved through the synergism of the cationized tannin and the dialdehyde starch. The main raw materials of the reinforcing agent are renewable, formaldehyde-containing wet strength resin systems such as urea resin and melamine formaldehyde resin are not adopted, and the reinforcing agent is suitable for production of tea filter paper.

The invention discloses a retrogen-loaded hydrogel water-absorbing antibacterial liner as well as a preparation method and application thereof, and the preparation method comprises the following steps: mixing a gelatin solution and a dialdehyde starch solution to obtain a Ge-Ds solution; the preparation method comprises the following steps: mixing a bacterial cellulose solution with a Ge-Ds solution to prepare a Ge-Ds-Bc solution; and mixing the Postbio YDFF-3 solution with the Ge-Ds-Bc solution, heating and stirring, cooling the mixture to room temperature, pouring into a culture dish, transferring to the temperature of-20 DEG C, preserving for 24 hours, and freeze-drying to obtain the hydrogel water-absorbing antibacterial liner loaded with the metabiotics. According to the invention, gelatin, dialdehyde starch and bacterial cellulose are used as matrix substances, and the postbiotic postbioYDFF-3 is added as an antibacterial substance to prepare the water-absorbing antibacterial liner for refrigeration and preservation of grass carp, the water-absorbing antibacterial liner is used for absorbing blood water or percolate of grass carp meat and reducing moisture required by microbial reproduction, and the antibacterial effect of the postbiotic postbioYDFF-3 is utilized to improve the refrigeration and preservation effects of grass carp. Therefore, growth of spoilage microorganisms in the grass carp meat is inhibited, and the refreshing time of the grass carp meat is prolonged.

The invention relates to the technical field of microencapsulation, in particular to microencapsulated tea oil and a preparation method thereof.The preparation method comprises the steps that nano-silica-grafted dialdehyde starch is prepared firstly, then the nano-silica-grafted dialdehyde starch serves as a solid emulsifier to prepare an O / W type Pickering emulsion containing tea oil, the Pickering emulsion is added into a chitosan solution to obtain a microcapsule solution, and the microcapsule solution is added into the chitosan solution to obtain the microencapsulated tea oil. The microencapsulated tea oil disclosed by the invention is high in mechanical strength, convenient to transport and preserve and excellent in high temperature resistance and oxidation resistance, and can be widely applied to food, health care products and daily chemical products.

The invention relates to the technical field of microcapsule preparation, in particular to a microencapsulated preparation for improving the stability of oxyresveratrol, which comprises 8-10 parts of oxyresveratrol, 1-3 parts of vitamin E, 5-8 parts of fibroin, 3-5 parts of dialdehyde starch and 0.5-1.5 parts of nano silicon dioxide. The fibroin, the dialdehyde starch and the nano silicon dioxide are used as wall material components, so that a physical barrier can be provided for the oxidized resveratrol, and the structure of the microcapsule can be optimized, so that the microcapsule is more stable and compact, and the core material is better protected; meanwhile, the vitamin E is added, so that the oxidized resveratrol can be further protected from oxidative damage in an auxiliary manner.

The invention discloses a method for preparing gel for delivering epigallocatechin gallate (EGCG) by utilizing soybean protein isolate compounded dialdehyde starch to overcome isoelectric points, the prepared gel can efficiently carry EGCG, and the method belongs to the field of food processing. The method comprises the following steps: respectively dispersing SPI and DAS with the concentration of 1% in ultrapure water, stirring, adjusting the pH value, and hydrating to obtain a soybean protein isolate solution and a dialdehyde starch solution; sPI and DAS are mixed according to the ratio of 4: 1, 2: 1, 1: 1, 1: 2 and 1: 4 respectively, stirring is conducted for 2 h in the alkaline environment (pH = 8.0), then the mixture is adjusted to be faintly acid (pH = 6.0), EGCG with the mass 1 / 30 of that of protein is added, and stirring is conducted again for 1 h. Respectively adjusting the pH value of the obtained mixture to 4.0 and 4.5, standing for 24 hours, and centrifuging to obtain the EGCG-carrying composite gel. The SPI-DAS gel prepared by the method is free of any additive, the obtained composite gel is more environment-friendly and safer and has higher stability, and the bioavailability of EGCG (epigallocatechin gallate) can be improved when the composite gel is used for carrying EGCG (epigallocatechin gallate). The method is simple in process and environmentally friendly, the application difficulty of SPI at the isoelectric point is solved to a certain extent, and the application range of the soybean protein isolate in the food industry is widened.

The invention relates to a high-strength degradable straw paper mulching film as well as a preparation method and application thereof. The method comprises the following steps: dissociating straw mechanical pulp and preparing into a paper pulp suspension; sequentially carrying out cationic starch treatment, dialdehyde starch treatment and amylopectin treatment on the paper pulp suspension to obtain treated pulp; and sequentially carrying out paper sheet forming, squeezing dehydration and hot pressing treatment on the treated slurry to prepare the high-strength degradable straw paper mulching film. The starch-based composite wet strength agent (formed by compounding cationic starch, dialdehyde starch and amylopectin according to a specific sequence) is developed, and a heat treatment process is optimized, so that the environment-friendly straw fiber mulching film which is high in dry and wet strength, good in water resistance and fully biodegradable is finally prepared, and the agricultural mulching requirement is effectively met.

The invention relates to the technical field of drug carrier materials, in particular to a starch-based capsule and a preparation method thereof.The preparation method comprises the following steps that S1, dialdehyde starch is gelatinized and then mixed with a tannic acid solution, then a ferric chloride solution is added, uniform mixing and defoaming are conducted, and a film forming solution is obtained; s2, immersing a mold into the film forming liquid, pulling, and carrying out preliminary drying under set temperature and humidity conditions to form a gel film layer; and S3, demolding the primarily dried gel film layer to obtain a capsule blank, and sequentially carrying out humidity balance and drying to obtain the starch-based capsule. According to the preparation method, tannic acid and a proper amount of ferric chloride are added, so that an effective cross-linked network structure is formed among starch molecules, the mechanical strength of the capsule shell is enhanced, and the hygroscopicity is reduced.

This invention discloses a FeCDs-based dual-mode fluorescent probe, its preparation method, and its applications, belonging to the field of chemical synthesis and analytical technology. The probe exhibits a "fluorescence transition-new peak appearance" response to L-ascorbic acid and a "simple fluorescence quenching" response to D-ascorbic acid. It is prepared via hydrothermal synthesis of dialdehyde starch, 1,2-diaminonaphthalene, and FeCl3. During detection, the fluorescence color change is observed under a 365 nm UV lamp for visual detection, or excitation is performed at 360 nm, with L-AA exhibiting an Ig... 430 / I 610 Ratio quantification, D-AA with I 610 Intensity-based quantification enables quantitative detection. Detection limits are 0.028 μmol / L and 0.033 μmol / L, respectively, allowing for rapid qualitative differentiation and highly sensitive quantitative detection of chiral ascorbic acid.