168 results about "DPPH" patented technology

The invention belongs to the field of biological medicines, and particularly relates to a preparation method of a pomegranate peel extract. The method comprises the following steps: pretreating fresh pomegranate rind, and extracting with mixed alcohol solvents with different concentrations. According to the extraction method provided by the invention, the pomegranate rind can be fully swelled after being soaked in the alginate oligosaccharide aqueous solution, and active ingredients in the pomegranate rind can be fully extracted after subsequent treatment, so that the extraction efficiency is improved, and the solubility and the stability of the active ingredients are improved; according to the preparation method, the mixed alcohol solvent is added in a stepped manner, so that the extraction rate of active ingredients is increased, and meanwhile, the prepared extract is increased in removal rate of DPPH free radicals and has excellent oxidation resistance.

The invention discloses a strain of Blastococcus atamensis YC-1 and application of the strain of Blastococcus atamensis YC-1, and belongs to the field of microbial strains. The streptococcus sp. YC-1 provided by the invention has high antioxidant activity and also has the capability of producing DHHB (docosahexaenoic acid); meanwhile, the YC-1FLE is prepared by adopting absolute ethyl alcohol as a solvent, has no toxicity to HaCaT cells, is relatively high in reducing capacity, has a scavenging effect on DPPH free radicals, ABTS cation free radicals and hydroxyl free radicals, has a tyrosinase inhibition effect and shows good antioxidant and whitening effects; when the YC-1FLE is applied to the sunscreen lotion, the sunscreen coefficient of the sunscreen lotion containing the YC-1FLE is obviously higher than that of a blank control group, which shows that the YC-1FLE has better ultraviolet resistance. Therefore, the strain and the lysate extract of the fermentation product of the strain have huge application potential in the field of cosmetics.

The invention discloses a gelatinized and / or micronized nucleoside drug and a preparation method thereof, and belongs to the technical field of drugs. The preparation method comprises the following steps: mixing lipoic acid, a nucleoside drug and an esterification catalyst, carrying out a grafting reaction in a reaction solvent to obtain a lipoic acid grafted nucleoside drug, dispersing the lipoic acid grafted nucleoside drug in an organic solvent to obtain a dispersion liquid, dropwise adding the dispersion liquid into hot water, and carrying out ring opening polymerization to obtain the lipoic acid grafted nucleoside drug. The nucleoside drug nanogel, nanoparticle or nanofiber is obtained, and the structure and performance improvement based on the drug itself is realized. The gelated and / or micronized nucleoside medicine prepared by the invention has obviously improved scavenging rates of DPPH free radicals and ABTS free radicals, and the method can improve the oxidation resistance of the nucleoside medicine and has the characteristic of improving the stability and functionality of the medicine.

The invention discloses nano-enzyme coating recombinant probiotics as well as a preparation method and application thereof, and belongs to the technical field of biotechnology and nano medicine. According to the invention, engineered Escherichia coli Nissle 1917 (ECN (DE3)) is taken as a host, and glutathione peroxidase (GPX) and glutathione reductase (GR) genes are over-expressed through a genetic engineering means, so that an efficient antioxidant enzyme system is constructed. And sequentially modifying chitosan and cerium dioxide nano-enzyme (CNP) on the surfaces of the thalli by using an electrostatic layer-by-layer self-assembly technology to form a protective coating. The nano-enzyme coating significantly improves the survival rate of the recombinant probiotics in severe environments such as simulated gastric acid (pH 2.5) and bile salt (0.3%), and enhances the ability of the recombinant probiotics to remove reactive oxygen species (ROS), including hydrogen peroxide, superoxide anions, hydroxyl free radicals and DPPH free radicals.

The invention discloses a preparation method and application of a blueberry anthocyanin extract, and belongs to the technical field of natural product extraction. The preparation method comprises the following steps: mixing blueberry pomace powder and water according to a solid-liquid ratio of 1: (10-50), exhausting, performing ultrasonic-assisted extraction, adding hemicellulase accounting for 0.6-1.4% of the mass of the pomace powder, extracting at 40-60 DEG C for 1-4 hours, and finally centrifuging to obtain a blueberry anthocyanin extracting solution. According to the method, the blueberry pomace is cooperatively treated by ultrasonic waves and hemicellulase, so that the defects of low efficiency and easy degradation of anthocyanin in a traditional extraction method are overcome, and the method has the outstanding advantages of high extraction rate, good activity maintenance and green and environment-friendly process. The obtained extract shows excellent DPPH and ABTS < + > free radical scavenging ability, and can be widely applied to functional food, health care products and cosmetics as a natural antioxidant.

The invention discloses an antioxidant repairing composite composition containing a picea norvegensis leaf extract and a preparation method thereof, and relates to the field of skincare products, the picea norvegensis leaf extract, leontopodium alpinum and citrus fruit extract are used as main materials, and the picea norvegensis leaf extract and leontopodium alpinum can play a role in the whole pathway of Nrf2 and NF-kappa B, so that the antioxidant repairing composite composition has the advantages that the antioxidant repairing composite composition is free of toxic and side effects; and the citrus fruit extract can inhibit the activation of TRPV1 and relieve the discomfort of the sensitive skin, so that the composition not only can improve the skin barrier of the sensitive skin, but also can inhibit the activity of the TRPV1, and the TRPV1 can be activated only by breaking the barrier and damaging the barrier under the two actions, so that the skin barrier can be well repaired. And the vicious circle of barrier injury can be aggravated by the excessive activation of the TRPV1, so that the stabilization and repair of the skin are realized, and the emulsion provided by the invention has a relatively good DPPH clearance rate and relatively good oxidation resistance.

The invention belongs to the technical field of fermentation and metagen preparations, and particularly relates to application of bifidobacterium breve metagen in the aspects of scavenging free radicals and relieving oxidative aging. According to the present invention, the oxidative free radical scavenging experiment results show that the bifidobacterium breve NKU BB 1-2 metagen has good oxidative free radical scavenging ability, and has good scavenging ability on hydroxyl free radicals, superoxide anions and DPPH free radicals; meanwhile, through component analysis, it is found that the bifidobacterium breve NKU BB 1-2 metagen contains various antioxidant and anti-aging bioactive substances such as flavonoids, indoles, amino acids, bile acids and ceramides; a cell model experiment verifies that the bifidobacterium breve NKU BB 1-2 metagen can obviously relieve oxidative damage to the cells and improve the oxidation resistance of the cells, so that oxidative aging is relieved.

The invention provides a composition containing exosome, which is prepared from the following components in parts by weight: 10 to 20 parts of exosome, 5 to 15 parts of extract, 0.3 to 0.5 part of antioxidant and 0.05 to 0.1 part of preservative, the extract is a mixture of 3-8 parts of aloe extract, 1-5 parts of camellia flower extract and 1-3 parts of cranberry extract; the preservative is one or more of benzoic acid, salicylic acid, boric acid and sorbic acid; the antioxidant is propyl gallate. When the composition is applied to an anti-aging product, the temperature sensing effect and the DPPH free radical scavenging rate are obviously improved.

The application discloses a kind of earthworm protein with twelve 3 peptides, which is prepared by degrading earthworm protein with catalytic amount of Pro-Ala-Lys. The application also discloses the preparation method of the earthworm protein with twelve 3 peptides and the application of the earthworm protein with twelve 3 peptides in removing ·OH free radicals and DPPH free radicals. Experimental results show that the earthworm protein with twelve 3 peptides has excellent effects in removing ·OH free radicals and DPPH free radicals. Therefore, the earthworm protein with twelve 3 peptides provides an effective technical means for preparing ·OH free radical scavenger and DPPH free radical scavenger.

The preparation method of the camellia oil fermentation product comprises the following steps that a fermentation base solution containing camellia oil and a strain seed solution are mixed, the strain seed solution comprises at least one of lactobacillus plantarum and saccharomyces cerevisiae, fermentation culture is conducted, and the camellia oil fermentation product is obtained. The fermentation liquor containing the camellia oil leavening is obtained. Compared with a camellia oil fermentation product obtained by fermenting other strains, the camellia oil fermentation product provided by the scheme has higher antioxidant activity (DPPH and ABTS free radical scavenging ability), has stronger ability of inhibiting cells from spontaneously generating NO (nitric oxide), shows good biocompatibility in a cell experiment, and can be used for preparing a camellia oil fermentation product. The obvious adverse effect on the cell activity is not generated.

The invention discloses a small molecule peptide with antioxidant activity as well as a preparation method and application of the small molecule peptide. According to the technical scheme, the method comprises the following steps: 1) carrying out enzymolysis on squid viscera by adopting neutral protease (4000U / g, pH 7.0, 50 DEG C and 8 hours), carrying out freeze drying, and identifying peptide fragments through MALDI-TOF mass spectrometry; 2) binding molecular docking (AutoDock Vina screening binding energy lt; the method comprises the following steps of: screening out two small molecular peptides YVPGKFRQTN and GLPQTMEVYLR with antioxidant activity (-8.0 kcal / mol) and molecular dynamics simulation verification, namely YVPGKFRQTN and GLPQTMEVYLR with antioxidant activity; and 3) experimental verification shows that the DPPH free radical scavenging rates of the two are respectively 89.4% and 83.1% when the concentration of the two is 2.5 mg / mL, and oxidative stress is remarkably inhibited by up-regulating an Nrf2 pathway (protein expression is 3.0-3.5 times, and HO-1 / SOD1 gene expression is 3.6-4.1 times). The obtained antioxidant activity small molecule peptide can be applied to development of functional food, cosmetics and anti-aging drugs, and a new way is provided for high-value utilization of squid byproducts.

The application discloses a South China Sea Decapterus maruadsi polypeptide with uric acid reducing and antioxidant activities and an application thereof, and relates to the technical field of biology. The polypeptide with high uric acid reducing activity and antioxidant activity is screened through activity prediction and molecular docking, and the amino acid sequence is FYDWWK. The polypeptide can be stably combined with the active center of xanthine oxidase, forms multiple hydrogen bonds and hydrophobic interaction, significantly inhibits the generation of uric acid, and has an in-vitro xanthine oxidase inhibition IC 50 of 3.068±0.2547 mmol / L. Meanwhile, the polypeptide has excellent DPPH free radical scavenging capacity, and an IC 50 of 5.033±0.5476 mmol / L. The polypeptide has good stability, still has high efficient inhibitory activity after simulated gastrointestinal digestion, and has oral development potential. The polypeptide is a natural marine small molecule active peptide, is safe and easy to absorb, and can be applied to the preparation of products related to uric acid reducing and / or antioxidant.

The invention belongs to the technical field of biology, and particularly relates to acetylated raffinose and application thereof. According to the invention, acetylation modification is carried out on raffinose by using an acetylation reagent to obtain acetylated raffinose, the acetylated raffinose can significantly improve the scavenging ability and total antioxidant ability of raffinose on DPPH free radicals, and the scavenging ability on hydroxyl free radicals and the reduction ability on iron ions are also improved to a certain extent. The acetylated raffinose provided by the invention has potential application value in development of functional foods and antioxidants.

The invention discloses an antibacterial and antioxidant sodium alginate film as well as a preparation method and application thereof, and belongs to the technical field of antibacterial materials. Epsilon-polylysine and tannic acid are synergistically compatible and are loaded on the surface of a sodium alginate matrix by adopting an atomization spraying technology, so that an antibacterial and antioxidant sodium alginate film is formed. The membrane successfully integrates the broad-spectrum antibacterial property of EPL and the strong antioxidant activity of TA, solves the problem of single function in the prior art, and realizes the synergistic interaction of antibacterial property and antioxidant property; secondly, due to the stable combination and slow release characteristics between TA and sodium alginate molecules, the membrane shows remarkable and lasting functionality, for example, the clearance rate of the obtained SA / EPL / TA membrane to DPPH free radicals can still be kept at 90% or above 7 days later, and the DPPH free radicals can be kept at 90% or above. The defect of short efficacy caused by volatilization or rapid migration of a traditional film added with a small-molecule antioxidant (such as plant essential oil) is effectively overcome.

The invention discloses protein soft sweets based on an olive pomace extract as well as a preparation method and application of the protein soft sweets. The protein soft sweets mainly consist of the following components in parts by mass: 10-50 parts of the olive pomace extract, 10-80 parts of collagen, 10-40 parts of gelatin, 1-20 parts of inulin, 1-10 parts of glucose syrup, 1-5 parts of malic acid and 1-5 parts of sodium citrate. The protein soft sweets based on the olive pomace extract have olive flavor, are amber, are crystal clear, glossy and rich in olive flavor before being sprayed with powdered sugar, and are moderate in viscosity, not sticky to teeth and good in elasticity and resilience after being sprayed with powdered sugar; the olive pomace extract prepared by the preparation method disclosed by the invention also has relatively high oxidation resistance, shows very high scavenging ability in the aspects of DPPH free radical scavenging ability and ABTS < + > free radical scavenging ability, has the free radical scavenging ability of the olive pomace extract, is beneficial to preventing oxidative damage and maintaining health, and can be used as an antioxidant functional food.

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 discloses a rhizoma polygonati derived carbon dot with a Schiff base structure as well as a preparation method and application of the rhizoma polygonati derived carbon dot. The rhizoma polygonati derived carbon dot comprises the Schiff base structure, hydroxyl and carboxyl functional groups, the rhizoma polygonati derived carbon dots are spherical in microstructure and uniform in particle size distribution, the particle size range is 1.5-3.6 nm, and the lattice spacing is 0.20-0.21 nm. The water solubility is good, the emission wavelength is 407 nm under excitation of 330 nm, and the absolute fluorescence quantum yield is 16.2%; the fluorescent probe shows high specific recognition capability on metal ions such as Fe < 3 + >, the detection limit is as low as 1 mu M, and the fluorescence intensity and the ion concentration are in a good linear relationship within the concentration range of 10-100 mu M; good free radical scavenging capacity is achieved, and the scavenging effect on DPPH and ABTS free radicals at the concentration of 100 micrograms / mL reaches 80% or above; and a certain broad-spectrum antibacterial effect is achieved.

The application discloses a strain of yeast for efficiently transforming ginsenosides and polysaccharides and application thereof, and belongs to the technical field of functional component transformation. According to the total ginsenoside and polysaccharide content in ginseng, a strain of yeast for efficiently transforming ginsenosides and polysaccharides is screened by taking a comprehensive score as an index, and is identified as Zygosaccharomyces bisporus by morphology, physiology and biochemistry and molecular biology, and is preserved in the China Center for Type Culture Collection with a preservation number of CCTCC NO: M 2020912. After transformation, the total ginsenoside content in American ginseng and ginseng is respectively increased by 67.81% and 107.03%, and the polysaccharide content is respectively increased by 238.61% and 205.87%. The DPPH antioxidant capacity, ABTS antioxidant capacity, blood sugar lowering capacity and blood lipid lowering capacity of the total ginsenoside extract and polysaccharide extract of the American ginseng and ginseng after transformation are all improved. The yeast screened by the application has a wide application prospect.

The invention discloses a fermentation medium for high yield of oudemansiella oosporium mycelium polysaccharide and a culture method thereof. The fermentation medium comprises the following components in percentage by mass: 20-25% of potatoes, 1-4% of corn flour, 0.2-0.4% of peptone, 0.2-0.4% of CaSO4, 0.05-0.15% of MgSO4 and the balance of water, and the pH value of the fermentation medium is 5.5-6.5. According to the culture medium, growth of Oudemansiella ovalis hyphae can be accelerated by regulating and controlling the proportion of different nutritional components, synthesis of Oudemansiella ovalis polysaccharide can be promoted, the final sugar yield of the strain is increased by 7 times compared with that of conventional culture by adopting the optimized fermentation culture medium and fermentation process, and the sugar yield can reach 167.37 mg / g. The scavenging rates of DPPH free radicals, ABTS free radicals and hydroxyl free radicals of the oospore oudemansiella sp. Polysaccharide are 95.02%, 98.08% and 93.74% respectively, and the scavenging rates are obviously higher than those of previous research results. The invention provides a new direction for developing natural antioxidants, and also provides theoretical significance and application value for developing oudemansiella oosporium mycelium fermentation products.

This invention aims to address the technical bottlenecks of existing milk curd products, such as weak functional activity, unclear process parameters, and unstable flavor and quality. It utilizes *Pediococcus pentosaceus* HM4, *Streptococcus thermophilus* HM6, *Lactococcus lactis* JY4, and *Lactobacillus plantarum* NC1, employing these four strains in an optimal ratio as a compound fermentation agent to achieve synergistic effects. Using milk and goji berries as raw materials, the fermentation process of milk curds and goji berry milk curds was systematically optimized through single-factor experiments, Plackett-Burman experiments, and response surface methodology. The physicochemical indicators and flavor characteristics of the products under different process conditions were analyzed. The obtained milk curds achieved a DPPH free radical scavenging rate of 91.38%–94.15%, providing technical support for the high-value utilization of milk curds and enriching the variety of functional dairy products.

This invention discloses the application of a porcine-derived Bacillus in antioxidant activity, wherein the porcine-derived Bacillus is used to prepare antioxidant products. The porcine-derived Bacillus is Bacillus subtilis YB-X-721, classified as Bacillus subtilis, and was deposited at the China General Microbiological Culture Collection Center on November 10, 2023, with accession number CGMCC No. 28942. The fermentation supernatant, bacterial suspension, and cell-free extract of the porcine-derived Bacillus subtilis YB-X-721 of this invention all possess certain DPPH free radical, superoxide anion free radical, and hydroxyl free radical scavenging abilities, as well as a certain reducing ability, and can be used to prepare antioxidant products. Furthermore, when the porcine-derived Bacillus subtilis YB-X-721 of this invention is added to piglet feed as an animal feed additive, it can improve the growth performance of weaned piglets, significantly increasing average daily weight gain, and significantly reducing average daily feed intake, feed conversion ratio, and diarrhea rate.

This invention relates to the field of peptide technology, and more particularly to a cyclic tetrapeptide compound, its preparation method, and its applications. The peptide compound has the structure shown in Formula I, or its stereoisomer or salt thereof: c(AA1-AA2-AA3-AA4), Formula I. The cyclic tetrapeptide compound can simultaneously inhibit the release of the inflammatory factor IL-6 and effectively scavenge reactive oxygen species DPPH, ABTS, and PTIO. It can effectively inhibit the production of reactive oxygen species, alleviate skin inflammation, and improve skin condition, showing great promise in the fields of anti-inflammatory and antioxidant applications.

The invention discloses an anti-oxidation and anti-aging composition and application thereof.The anti-oxidation and anti-aging composition comprises a chlorella extract and a rice chaff extract, practice shows that after the chlorella extract and the rice chaff extract are combined, the anti-oxidation and anti-aging effect can be achieved, and the obvious amplification can be achieved in an anti-oxidation test-DPPH free radical scavenging experiment; and after combination, no negative influence is caused on the activity of the fibroblast, and the expression level of the COL I of the fibroblast is obviously improved. In addition, an obvious effect can be achieved under the condition of low concentration, large-amount addition is not needed, and the effect is stable.

The application discloses corn active peptides with effects of dispelling alcohol, reducing uric acid and resisting oxidation, a preparation and application thereof, and belongs to the technical field of bioactive peptides.The amino acid sequence of the corn active peptides is at least one of LMFP, FEGLFR, FLR and QLPSYR.The corn active peptides with effects of dispelling alcohol, reducing uric acid and resisting oxidation are separated from corn germ meal through enzymolysis, ultrafiltration and other technologies, the amino acid sequences of the separated peptide segments are determined, and bioinformatics technology is combined for screening, and finally four peptide segments are obtained.The identified peptide segment sequences are chemically synthesized, and the effects of dispelling alcohol, reducing uric acid and resisting oxidation of the synthesized single peptide segments and compound peptide segments are determined.The corn active peptides all have good XOD inhibition rate, DPPH clearance rate and ADH activation rate, and have important application prospects in the development of products with effects of dispelling alcohol, reducing uric acid and resisting oxidation.

The invention discloses a method for predicting the turbidity tendency of beer caused by micromolecular dextrin, and relates to the technical field of beer quality detection. According to the method disclosed by the invention, micromolecular dextrin is determined as a core turbid substance through systematic analysis on beer components. According to the method, colloidal substances are separated from beer to be detected through membrane filtration and centrifugation, the essence of starch substances is verified through an enzymolysis experiment, structural characterization is conducted through Fourier transform infrared spectroscopy, nuclear magnetic resonance and other experiments, and correlation between the colloidal substances and turbidity is verified through FTIR, an electron microscope and DSC (differential scanning calorimetry). Based on the concentration of micromolecule dextrin, the concentration of tannic acid and the DPPH free radical scavenging rate, a multiple linear regression prediction equation is established, accurate prediction of the turbidity tendency of beer is achieved, and technical support is provided for beer production process optimization and quality control.

The invention discloses hump conjugated linoleic acid, a hump conjugated linoleic acid microcapsule and a preparation method and application of the hump conjugated linoleic acid microcapsule, and belongs to the technical field of deep processing of hump fat. According to the method, petroleum ether is used as a solvent, crude fat is extracted from hump fat through a Soxhlet extraction method, NaOH-ethanol is used for saponifying the crude fat, then a low-temperature crystallization method is combined with a urea adduction method, and finally, the conjugated linoleic acid is effectively separated and purified. The determination of the free radical scavenging ability of DPPH and ABTS shows that the obtained CLA has oxidation resistance. Extracted and purified conjugated linoleic acid is used as a core material, whey protein isolate and maltodextrin are selected as wall materials, an emulsion is prepared, and microcapsule powder is prepared by a direct vacuum freeze-drying method. Experiments show that the prepared conjugated linoleic acid microcapsule has a complete structure and good thermal stability.

The invention discloses an algae-derived functional active peptide, a preparation and application, and belongs to the technical field of biological active peptides. The amino acid sequence of the algae-derived functional active peptide is at least one of FPRFR and FLF. According to the preparation method, two bioactive peptides with the effects of resisting oxidation and reducing uric acid are obtained through separation and purification by taking micrococcus as a raw material, chemical synthesis is carried out according to an identified peptide fragment sequence, the effects of reducing uric acid and resisting oxidation of a synthesized single peptide fragment and a compounded peptide fragment are determined, and the bioactive peptides have relatively good XOD inhibition rate and DPPH clearance rate. Therefore, the algae-derived functional active peptides not only can be used as natural antioxidants in food, medicines and / or cosmetics, but also can be used as natural uric acid-reducing supplements in medicines; the method has an important application prospect in the development of products with the effects of reducing uric acid and resisting oxidation.

The present application belongs to the technical field of application of fungal polysaccharides, and particularly relates to a Boletus edulis fruiting body polysaccharide as well as a preparation method and application thereof. Polysaccharides in Boletus edulis fruiting bodies are extracted, and the chemical structure of BDP-F is characterized by ultraviolet-visible light, Fourier transform infrared spectroscopy, one-dimensional nuclear magnetic resonance and two-dimensional nuclear magnetic resonance. The research results show that BDP-F is mainly composed of mannose, glucose, galactose and fucose. Methylation and nuclear magnetic resonance analysis show that the glycosidic bond of BDP-F is (1→6)-alpha-d-galactose, the main chain is composed of ->6)-alpha-d-galp-(1→ residues, and the O-2 position is branched by alpha-L-Fucp-(1→ and alpha-D-Manp-(1→ residues. Through DPPH free radical, hydroxyl radical and superoxide anion radical scavenging experiments, it is shown that BDP-F has the ability to serve as a natural antioxidant, and BDP-F can also reduce alcohol-induced GES-1 cell damage through antioxidant and anti-inflammatory effects within the experimental concentration range.

The invention relates to the technical field of pesticide reduction and synergism, and discloses a synergistic weeding composition based on trifluralin and butralin as well as a preparation method and application of the synergistic weeding composition. The composition comprises 10-20 parts of trifluralin, 10-20 parts of butralin, 70-80 parts of a solvent, 5-15 parts of an emulsifier, 2-5 parts of silicone oil and 1-10 parts of an antioxidant. The antioxidant has a structure. Tests show that the control effect of the composition on broad-leaf weeds such as edible amaranth and chenopodium album and grassy weeds such as green bristlegrass and digitaria sanguinalis reaches 80-100%, and the removal rate of the composition under the concentration of 16 mu M in a DPPH free radical removal experiment reaches up to 91.2%. The problems that a traditional herbicide is prone to oxidation inactivation, poor in pesticide effect persistence, high in environmental risk and the like are effectively solved, and efficient weeding and environmental safety are achieved.

This invention discloses a high-strength, tough, and antibacterial polyurethane elastomer and its preparation method. Using polyols as soft segments, isocyanates as hard segments, plant polyphenolic polyols as chain extenders, and iron salts as ligands, a high-performance polyurethane elastomer based on metal ion coordination is prepared. Due to the synergistic effect of the reversible breakage-reorganization mechanism of the dynamic coordination bonds between iron ions and phenolic hydroxyl groups and the separation of the polyurethane microphase, this polyurethane elastomer exhibits excellent mechanical properties. Furthermore, although iron ion coordination reduces the DPPH scavenging rate from 94.17% to 88.89%, it significantly enhances the photothermal conversion performance of the material. After irradiation with 808 nm near-infrared light, the PU-DVO-Fe... 1 / 4 Polyurethane achieved 100% antibacterial rate against both E. coli and S. aureus.