44 results about "Alizarin" patented technology

The invention provides application of linariin-6-O-glucoside in preparation of a product for preventing and treating osteoporosis, and relates to the field of biological medicine. According to the invention, dyeing experiments of alkaline phosphatase, alizarin red and tartaric acid resistant acid phosphatase prove that the sesaminin-6-O-glucoside has affinity for FPPS receptors, has the capability of promoting bone marrow mesenchymal stem cells to form bone cells, is superior to that of bisphosphate, and can inhibit the generation of osteoclasts; microCT (micro computed tomography) detection results show that the sesaminin-6-O-glucoside has the effect of relieving the osteoporosis and can promote the formation of bone trabecula. According to the application disclosed by the invention, it is proved for the first time that the sesaminin-6-O-glucoside has the effect of resisting osteoclast formation, and meanwhile, the sesaminin-6-O-glucoside also has a better osteogenesis effect, so that a basis is provided for developing the sesaminin-6-O-glucoside as a potential medicine for treating osteoporosis.

The invention discloses an antibacterial and hydrophilic dual-functional ionic liquid double-layer membrane as well as a preparation method and application thereof. According to the double-layer film, corn starch (ST) and polyvinyl alcohol (PVA) serve as substrates, and natural dye alizarin (AL) is mixed to serve as a hydrophilic layer; chitosan (CS), corn protein (Zein) and vanillin (VA) serve as a supporting layer; meanwhile, the ionic liquid is doped, so that the double-layer film is endowed with a fresh-keeping function and sensitive detection capability, the limitation of a single detection function is broken through, and a new thought is provided for food safety.

The invention relates to the technical field of cotton fabric manufacturing, in particular to a charge transfer and transition bacteriostatic pure cotton non-woven fabric and a manufacturing method thereof.The manufacturing method includes the steps that raw cotton is degreased, opened and carded, base cloth is manufactured through a spunlace method, and the pretreated pure cotton non-woven fabric is obtained after drying and impurity removing; the preparation method comprises the following steps: soaking cotton fibers into a charge transfer transition reagent containing alizarin and waterborne polyurethane, accurately loading through a four-roller unit, and curing through 254nm-365nm ultraviolet light, so that the reagent and the cotton fibers form covalent bonds to realize charge transfer transition. An ultrathin polymer film layer is formed on the cloth cover of the product, million-level electron-hole pairs are contained, the initial bacteriostasis rate exceeds 99%, and a good bacteriostasis effect is still kept after the product is washed with water for 150 times. The antibacterial non-woven fabric adopts a natural antibacterial agent, is free of skin irritation and toxic residues, is environment-friendly in production process, has skin friendliness and mechanical strength, is suitable for medical and hygienic products such as surgical gown and medical dressing, and solves the problems of poor washability, potential safety hazards and the like of the traditional antibacterial non-woven fabric.

The invention belongs to the field of intelligent degradable food packaging materials, and particularly relates to a pH response type intelligent degradable packaging film and a preparation method and application thereof. According to the invention, PBAT / PLA blended resin is used as a degradable matrix, a natural pH sensitive indicator alizarin is used as an intelligent response unit, no auxiliary component is added, and the high-performance pH response type intelligent degradable packaging film is prepared by controlling an alizarin solvent pre-dispersion-gradient mixing process and melt blending parameters. According to the invention, through collaborative proportion optimization of PBAT and PLA, the balance of flexibility and rigidity of the membrane is ensured, a uniformly dispersed microenvironment is provided for alizarin, and the core problem of agglomeration of alizarin in a hydrophobic matrix is solved. The packaging film can visually monitor the corruption degree of perishable food such as fresh chicken breast and aquatic products in real time through color change, the preparation process is simple, the cost is controllable, the safety is high, and a brand new technical path is provided for greenization and intelligentization of food packaging.

This invention discloses a method for preparing and applying a chitosan-nanofibrillar-based smart indicator membrane loaded with anthocyanins and alizarin. The method includes the following steps: mixing beet powder with hydrochloric acid, washing with water until neutral, and drying; adding sodium hydroxide solution, mixing and reacting, washing with water until neutral, and drying; adding sodium chlorite solution, mixing, adjusting the pH to 3-3.5, reacting, and washing with water until neutral to obtain beet fiber; adding water, homogenizing under ultra-high pressure to obtain a beet nano-suspension; adding the beet nano-suspension to a chitosan-acetic acid solution and stirring, then adding glycerol; adding pigments, mixing, and obtaining a membrane solution; ultrasonically degassing, and drying to form a membrane. This membrane, as a food preservation indicator membrane, possesses both the characteristics and functions of food preservation and indicating food freshness; using beet nanofibers as a supplementary material improves the mechanical properties of the chitosan membrane; the addition of alizarin and anthocyanin mixed pigments enriches the color changes of the indicator membrane and improves its stability.

The invention discloses an alizarin A ring glycosylation derivative, a synthesis method thereof and application of the alizarin A ring glycosylation derivative in preparation of a medicine for treating myocardial cell injury. The structural formula of the alizarin A ring glycosylation derivative is # imgabs0 #. A series of alizarin A ring glycosylation derivatives are designed and synthesized through a computer-aided and chemical synthesis method; finally, the alizarin A ring glycosylation derivative, namely 1-amino-2-methyl-3-hydroxy anthraquinone, is found to be basically kept unchanged in antioxidant effect, increased in solubility in water, enhanced in binding capacity with 5 '-AMP activated protein kinase alpha2 protein, and enhanced in effect of treating and preventing myocardial cell dysfunction.

The application discloses a kind of meat preservation and freshness visual double-effect nano intelligent indicating film and preparation method thereof, belong to food packaging storage and detection technical field.The preparation method of the intelligent indicating film includes the following steps: (1) poly-3-hydroxybutyric acid-co-oxyvalerate (PHBV) and ferulic acid are dissolved in chloroform solution;(2) polyvinyl alcohol (PVA), konjac glucomannan (KGM), alizarin (AL) are mixed, and polyvinyl alcohol-konjac glucomannan-alizarin mixed solution is obtained by removing bubble;(3) PH-F solution is dried by electrospinning technology, and PVA-KGM-AL@PH-F double-layer indicating film is obtained.The application prepares meat freshness indicating film with efficient antibacterial performance and high sensitivity color response performance by regulating the pH of film-forming solution.In the intelligent indicating film, alizarin responds to meat spoilage biogenic amine, and the color of indicating film gradually changes from cream (slightly yellow) to light pink or even deep purple;By comparing the intelligent indicating film after reflection with colorimetric card, the freshness of meat can be judged.

The invention discloses a food packaging film with a freshness indicating function as well as a preparation method and application thereof, and relates to the technical field of food packaging materials. According to the packaging film, the alizarin red, the lignin and the guar gum form a synergistic effect, so that the toughness of a network skeleton is remarkably improved, and the negative influence of the alizarin red on the tensile strength of the skeleton is reduced, so that the mechanical comprehensive performance of the food packaging film is favorably improved; moreover, the loading of alizarin red reduces the water vapor permeability of the food packaging film, and is beneficial to improving the barrier property of the packaging film; meanwhile, the alizarin red endows the packaging film with reversible color switching under stimulation of ammonia gas and acetic acid, and real-time monitoring of food freshness changes is achieved; the food packaging film has mechanical toughness and a proper water vapor barrier, is green and safe, has no potential toxic and side effects, can be completely biodegraded, has renewable raw materials, can significantly improve the problem of food waste caused by environmental uncertainty, and is suitable for large-scale popularization and application.

The invention relates to a visual colorimetric sensor, a preparation method thereof and application of the visual colorimetric sensor in fluorine ion detection. According to the sensor, a cellulose membrane serves as a substrate, zirconium salt is loaded and reacts with alizarin sulfonate, and the alizarin zirconium sulfonate loaded cellulose membrane sensor is obtained. The preparation method comprises the following steps: firstly, taking sodium hydroxide, urea and cotton linter as raw materials, mixing, defoaming, forming a film, curing and the like to obtain a cellulose base film; then mixing and adsorbing a zirconium salt solution and the cellulose-based membrane, so that zirconium is loaded on the cellulose-based membrane; finally, mixing and reacting an alizarin sulfonate solution with the zirconium-loaded cellulose membrane under an acidic condition to obtain the zirconium alizarin sulfonate-loaded cellulose membrane sensor. When fluorine ions exist, the color of the sensor is quickly changed from wine red to colorless, so that visual qualitative and semi-quantitative detection is realized, the sensor has the advantages of high selectivity, quick response, low detection limit and the like, and a portable and efficient solution is provided for fluorine ion pollution monitoring.

The invention discloses a phosphorus-doped porous carbon metal-free oxygen reduction catalyst and a preparation method and application thereof, and belongs to the field of electrochemical catalytic materials.The preparation method comprises the steps that alizarin and tetrol diphosphite are jointly dissolved in absolute ethyl alcohol, chemical doping is conducted, porous brown precursor xerogel is obtained through a sol-gel method, and the porous brown precursor xerogel is prepared into the phosphorus-doped porous carbon metal-free oxygen reduction catalyst; and carbonizing in an inert atmosphere to obtain the phosphorus-doped porous carbon metal-free oxygen reduction catalyst. The electron concentration of adjacent carbon atoms can be effectively regulated and controlled through phosphorus doping, the energy barrier is reduced, so that the catalytic reaction is promoted, and the porous structure is beneficial to exposure of more active sites; the raw materials are cheap, the preparation method is simple, and large-scale production is easy; compared with commercial platinum carbon, the prepared catalyst has good activity and shows more excellent methanol tolerance at the same time.

The invention belongs to the technical field of high polymer materials, and relates to a colored flame-retardant metal coordination compound as well as a preparation method and application thereof in PA (polyamide) fibers. The preparation method comprises the following steps: firstly, controlling all phenolic hydroxyl groups in alizarin red molecules to be subjected to nucleophilic substitution or addition reaction with active P-H bonds of DOPO to generate ARS-DOPO, and then coordinating ARS-DOPO with Ca < 2 + > or Mg < 2 + > in a solvent to obtain the colored flame-retardant metal coordination compound. According to the application, after the colored flame-retardant metal coordination compound and PA are subjected to melt blending, the melt blending product is prepared into fibers. When the colored flame-retardant metal coordination compound disclosed by the invention is melt-blended with PA to prepare fibers, dyeing pollution can be avoided, high color saturation is ensured, and the fibers are endowed with excellent flame retardance.

This invention relates to the field of medical dressings, and discloses a composite fiber membrane, its preparation method, and its applications. The composite fiber membrane includes a pH-responsive fiber membrane, a hydrophobic fiber membrane distributed on one side of the pH-responsive fiber membrane, and a hydrophilic fiber membrane distributed on the other side of the pH-responsive fiber membrane. The pH-responsive fiber membrane comprises polyethylene oxide, chitosan, and alizarin dye. This composite fiber membrane exhibits good antibacterial effects and unidirectional moisture-wicking function, and can also change color under different pH conditions, showing great promise for application in the field of medical dressings.

The invention discloses a preparation method of a high-precision developing antibacterial intelligent film developed based on alizarin. The preparation method of the intelligent film comprises the following steps: dissolving alizarin in an ethanol solution to obtain an alizarin ethanol solution; adding polyvinylpyrrolidone and ethyl cellulose, and uniformly mixing to obtain a shell spinning solution; mixing cinnamyl aldehyde and polyoxyethylene with water and ethanol to obtain a core layer spinning solution; and preparing the film by using a coaxial electrostatic spinning technology. According to the invention, the shell layer is a film with moderate hydrophobicity obtained by mixing a hydrophilic material and a hydrophobic material, and alizarin is added as a color developing substance, so that an obvious color developing effect is realized. Cinnamyl aldehyde is added into a core layer solution, so that the film has antibacterial and antioxidant functions; the fibers with the core-shell structure are prepared through the coaxial electrostatic spinning technology, cinnamyl aldehyde can be wrapped, release of cinnamyl aldehyde is slowed down, and the antibacterial effect of the intelligent film is enhanced.

The invention discloses a preparation method and application of a biological medicine, the biological medicine is prepared by compounding alizarin, carrageenan oligosaccharide, agaro-oligosaccharide and a croton vine ethanol extract and taking a multivesicular liposome as a carrier, and through compounding of effective components and matching of the carrier with a slow release effect, the biological medicine can effectively treat kidney bean rust fungi, and has a good application prospect. The composition can effectively kill fungi and stimulate crop resistance, has long-lasting pesticide effect, good pesticide stability, easily degradable components and no residual toxicity, and provides support for development of a novel medicament for preventing and treating the kidney bean rust disease.

This invention discloses a pH colorimetric membrane for indicating meat freshness, obtained through the following steps: First, konjac glucomannan and polyvinyl alcohol are dissolved separately in distilled water and heated and stirred until dissolved; then, the konjac glucomannan aqueous solution and the polyvinyl alcohol aqueous solution are mixed to obtain a film-forming solution; curcumin and alizarin are added to the film-forming solution, homogenized using a homogenizer, and then ultrasonically treated to remove air bubbles; the solution is poured into a plastic petri dish and dried in an incubator to obtain the pH colorimetric membrane. This invention uses a 3:1 mass ratio of curcumin and alizarin as colorants, resulting in stronger pH sensitivity and more obvious color changes. Furthermore, all raw materials used are derived from natural substances, are safe and non-toxic, and edible. No complex processing of meat samples is required, making the operation simple and low-cost. It has great application potential in meat freshness monitoring and intelligent packaging, and can be applied to the freshness monitoring of various meat products.

The invention relates to a hair dye, in particular to a multifunctional hair dye and a preparation method and application thereof.The preparation method comprises the following steps that S1, alizarin is dissolved in ethyl alcohol, then deionized water is added, stirring and mixing are conducted, and an alizarin ethyl alcohol water solution is prepared; s2, dropwise adding an aldehyde perfume solution into the alizarin ethanol water solution prepared in the step S1, and ultrasonically mixing uniformly to obtain an alizarin-perfume mixed solution; s3, nonferrous metal ions are dissolved in the alizarin-spice mixed solution obtained in the step S2, stirring and uniform ultrasonic treatment are carried out, and an alizarin-spice-nonferrous metal ion solution is prepared. Compared with the prior art, the hair dye disclosed by the invention solves the problem that p-phenylenediamine, ammonia water and the like commonly existing in a traditional hair dye can cause harm to a human body. According to the scheme, polyphenol and perfume are combined through a self-assembly technology to form a stable dye system, the problems are solved, and an innovative solution is provided for the hair dye.

This invention provides a standardized preparation method and kit for double-stained transparent specimens of fish skeletons. Orthogonal experiments were designed for fish of different skeleton types (cartilaginous / boneless) and body lengths (small 5-7cm, medium 7-15cm, large 15-25cm), using factors such as KOH concentration and treatment time. Staining effect, transparency, and tissue integrity were used as indicators. Statistical analysis was used to establish an optimal parameter matrix database covering fixation, transparentization, and staining steps. During preparation, the database can be queried based on fish species and body length to obtain differentiated treatment parameters, achieving standardized operation. This invention also provides a kit containing staining stock solution, basic reagents, and a parameter query unit. This invention transforms double-stained skeleton preparation from experience-dependent to data-driven, significantly improving repeatability and success rate, and is suitable for scientific research, teaching, and demonstration.

This invention relates to a method for preparing a jungle camouflage coating with a large near-infrared simulated water peak. Alizarin green intercalated hydrotalcite (ZnAl-LDHs-AG), bismuth vanadate (BiVO4), and SAR resin synthesized by co-precipitation are mixed in a mass ratio of 3:3:1 to obtain a composite green pigment. This pigment is then mixed uniformly with PVA adhesive and glycerol in a mass ratio of 1:1:1. Finally, the above solution is uniformly coated onto spandex fabric and dried at 160℃ for 10 min to obtain the jungle camouflage coating. The jungle camouflage coating prepared by this invention exhibits four major spectral characteristics: a green peak, a red edge, a plateau, and a water absorption peak, with a spectral similarity of 98.37% to that of green plants. This invention utilizes the synergistic water-locking system constructed by the introduction of SAR and glycerol, forming a stable hydrogen bond network that effectively locks in moisture in the coating, significantly enhancing the characteristic near-infrared water absorption peaks at 1400 nm and 1900 nm. The camouflage coating prepared by this invention is safe and environmentally friendly, has excellent weather resistance, and possesses thermal shielding properties comparable to natural green plants.

This invention provides a detection reagent for an online fluoride ion monitoring instrument and its preparation method. The detection reagent includes reagent A and reagent B. Reagent A is an aqueous solution containing alizarin aminocarboxylic acid complexing agent and sodium acetate, and reagent B is an aqueous solution containing lanthanum nitrate, glacial acetic acid, and Triton. Reagent A, by adding sodium acetate, makes the aqueous solution weakly alkaline, allowing the powdered alizarin aminocarboxylic acid complexing agent, which is difficult to dissolve directly in neutral distilled water, to dissolve rapidly. In reagent B, Triton is added as an adjuvant to promote the complete dissolution of the alizarin aminocarboxylic acid complexing agent and the chromogenic substance, preventing solution turbidity and increasing solution clarity. Furthermore, the preparation of the detection reagent does not require attention to pH value, and it has the advantages of simple preparation, stable color development, and easy cleaning.

The invention provides chitosan for food packaging, a preparation method of the chitosan and a preparation method of a food packaging film, and belongs to the field of food engineering.The preparation method of the chitosan comprises the steps that natural pigment is added into N, N-dimethylformamide, stirring is conducted till the natural pigment is completely dissolved, and a pigment solution is obtained; dissolving chitosan in a glacial acetic acid aqueous solution, and fully swelling to form a transparent solution; dropwise adding the pigment solution into the transparent solution at room temperature, and uniformly stirring and mixing to obtain a mixture; adding a sufficient amount of a formaldehyde solution into the mixture until the reaction is completed, dropwise adding a sodium hydroxide solution to enable a product to form a precipitate, collecting the precipitate, and washing and freeze-drying the precipitate to obtain chitosan powder; wherein the natural pigment comprises curcumin and alizarin. The chitosan prepared by the method can improve the dispersibility of natural pigments in a film, improve the fixation mode of the pigments, avoid migration and loss, improve the light and heat stability of the natural pigments, improve the structural stability and mechanical properties of the film, and realize the double functions of preservation and indication.

The invention belongs to the technical field of fresh food detection, and particularly relates to a system and a method for rapidly detecting freshness of raw meat by using deep learning and a colorimetric fluorescent array, and the change of the freshness of chilled meat is intuitively reflected in a colorimetric / fluorescent dual mode by using the specific response of alizarin and FITC to biogenic amine. The structural change of the two pigments in different acid-base environments causes the change of color and fluorescence, so that the indication label sensitively responds to amine substances generated by the decay of chilled fresh meat. By optimizing pigment extraction and concentration screening, the detection sensitivity and accuracy are improved. And in combination with a deep learning model, the limitation of distinguishing color differences by human eyes is overcome, a large amount of image data can be quickly processed, and the freshness grade is accurately judged. And the food pollution risk is reduced by using natural pigments. According to the method, the defects of the existing chilled meat freshness detection technology are effectively overcome, rapid, accurate and nondestructive detection is realized, food safety is guaranteed, food waste is reduced, and the method has remarkable application value in the field of food detection.

This invention discloses alizarin / Al 3+ Application of alizarin / Al ratio fluorescent probe in ciprofloxacin detection 3+ The ratiometric fluorescent probe is composed of alizarin solution, AlCl3 solution, and HEPES buffer. In the presence of ciprofloxacin, upon excitation with light at a wavelength of 355-365 nm, it exhibits red fluorescence at 647-653 nm and blue fluorescence at 433-439 nm. Using red fluorescence as a reference signal and blue fluorescence as a response signal, the ratio of the two fluorescence signals shows a linear relationship with the concentration of ciprofloxacin, which can be used for the quantitative detection of ciprofloxacin. Furthermore, the alizarin / AlCl3 solution... 3+ The ratiometric fluorescent probe changes color from red through purple to blue as the concentration of ciprofloxacin increases, enabling semi-quantitative visual detection of ciprofloxacin. This alizarin / Al 3+ The base ratio fluorescent probe has excellent selectivity and anti-interference ability, which can realize the visual detection and quantitative analysis of ciprofloxacin residues in eggs with good sensitivity and high accuracy.

The application discloses a double-layer pH-sensitive fresh-cut fruit freshness indicating label and a preparation method and application thereof, and belongs to the technical field of fresh-cut fruit freshness monitoring. The preparation method takes a PLA and PEG blended film as a support substrate, takes a CS matrix loaded with alizarin and CEOE as a functional layer, and prepares a double-layer PSILs with a pH response function through a layer-by-layer casting method, and the double-layer PSILs is used in visual monitoring of fresh-cut fruit freshness. The application constructs a multi-layer composite film with a PLA-PEG composite film as a support layer material, the double-layer film exhibits optimal mechanical properties and relatively optimal water vapor barrier properties, and visual monitoring is realized in fresh-cut fruit freshness indication.

The invention relates to the technical field of biochemical medicine, in particular to a dry chemical qualitative detection method and a kit for detecting seminal plasma fructose. The method comprises the following steps: by adopting a room-temperature competitive color development system constructed by 3-quinoline boronic acid and alizarin red S, mixing a sample with a special diluent, and dropwise adding the mixture into the kit pre-loaded with test paper; and the judgment can be completed by comparing colors with naked eyes. The operation threshold and the cost limitation of equipment such as high performance liquid chromatography are avoided; the reaction is carried out under mild conditions, and strong corrosive reagents such as concentrated hydrochloric acid are not used, so that the operation safety is guaranteed; the sample treatment only needs simple dilution, and tedious pretreatment steps such as deproteinization, heating or derivatization are not needed, so that the detection efficiency is improved; the selected 3-quinoline boric acid, alizarin red S and auxiliary materials are conventional easily available chemical reagents, and the problem of obtaining special enzyme raw materials is solved. The technical effects of simplicity, convenience, quickness, safety, low cost and easiness in popularization are realized.

This invention belongs to the field of thin film processing technology, and relates to a colorimetric membrane, its preparation method, and its application. The colorimetric membrane prepared according to this invention comprises, by mass parts, 2.3-2.7 parts sodium alginate, 1.1-1.4 parts rice protein powder, 1.1-1.4 parts gelatin, 1.1-1.4 parts glycerol, 0.2-0.3 parts polydimethylsiloxane, and 0.15-0.25 parts anthocyanins; it may also include alizarin and phenolic acids. The colorimetric membrane of this invention has a wide pH response color gamut and color intensity, and good mechanical properties. The total color difference of the colorimetric membrane of this invention can reach up to 54.19, making the response of the colorimetric membrane material to the alkaline environment during food spoilage more intuitive and discernible. This invention uses specific types of phenolic acids, which significantly improves color stability while maintaining the wide color gamut response of the composite membrane; this stability and enhanced color development provide a guarantee for the long-term reliable application of intelligent packaging in the circulation and storage stages.

The invention provides a lanthanum-alizarin complex ketone spectrophotometric detection method for fluorine in a tantalum-niobium material, and relates to the technical field of element content detection.The method comprises the steps that 1, a lanthanum-alizarin complex ketone reagent is prepared; step 2, performing three-section gradient temperature control high-temperature hydrolysis on the tantalum-niobium material so as to release all-form fluorine; step 3, taking a ternary composite alkaline absorption liquid as a fluorine element absorption liquid, taking a lanthanum-alizarin complexing ketone reagent as a color developing agent, carrying out color developing reaction on fluorine escaped from the tantalum-niobium material after high-temperature hydrolysis, and carrying out absorbance determination; 4, carrying out a chromogenic reaction by using a fluorine standard solution and a lanthanum-alizarin complexing ketone reagent, and carrying out absorbance determination to obtain a standard working curve; and step 5, calculating the content of the fluorine element in the tantalum-niobium material according to the absorbance and the standard working curve obtained by measuring the tantalum-niobium material. According to the scheme, the detection accuracy of the fluorine content in the tantalum-niobium material can be improved by improving the release efficiency of all-form fluorine.

A water-resistant food freshness indicator colorimetric array and its preparation method include the following steps: first, dissolving polyvinyl alcohol and zein in a mixed solvent of acetic acid and water, respectively; then, evenly mixing the polyvinyl alcohol solution and the zein solution in a certain proportion; then, adding curcumin-alizarin mixed pigments in different mass ratios; and mixing to obtain a final spinning solution. A nanofiber indicator membrane is prepared using electrospinning technology. The present invention proposes using two natural pigments, curcumin and alizarin, and loading the indicators onto the electrospun nanofiber membrane using electrospinning technology. This results in a meat product freshness indicator colorimetric array with a lower detection line, more diverse color variations, and excellent stability. The array can display significant color changes according to volatile gases generated during meat product storage.

The present application belongs to the technical field of borax detection, and particularly relates to a method for improving the detection sensitivity of borax in toys. In the process of detecting the borax content in toys by using alizarin S solution, diphenylcarbazone solution is added as a color developer. By observing the color of the solution after the reaction, it can be quickly screened whether the borax in the toy clay exceeds the limit value of 3750 mg / kg, whether the borax in the crystal mud gel exceeds the limit value of 1250 mg / kg, and the toy products with excessive borax content are screened out. The detection of the borax content in the crystal mud and the toy clay is realized, and the quantitative limits of 0, 1250 and 3750 mg / kg are achieved. The method of the present application can be used for on-site rapid detection, and the operation is simple, which provides convenience for on-site rapid screening and quantification of the borax content.

The invention provides a dual-emission carbon dot probe with a dynamic adjustable range for glutathione as well as a preparation method and application of the dual-emission carbon dot probe. The carbon dot probe is synthesized from alizarin red, carbon powder and ethylenediamine through a hydrothermal method, and the carbon dot probe shows concentration-dependent nonlinear fluorescence response in the presence of glutathione. By adjusting the concentration of the phosphate buffer solution, the detection parameters of the probe can be continuously and adjustably changed, and the wide-range detection of glutathione from 0.46 mu M to 3.2 mM is realized. The carbon dot probe has the advantages of high sensitivity, high selectivity, simplicity and convenience in operation, low cost and the like, and can be widely applied to the fields of environmental monitoring, food safety, biomedical diagnosis and the like.

The present invention discloses a preparation method and application of an indicator displacement sensor array for tea polyphenol identification. The array is prepared by using two arylboronic acids, 1-naphthaleneboronic acid (NapB) and 1-pyreneboronic acid (PyrB), as probes, and catechol-containing Alizarin Red S (ARS) and catechol violet (PV) as indicators. Based on the indicator displacement method (IDA) mechanism, a 2×2 colorimetric sensor array is designed and constructed for detecting and identifying different types of tea polyphenols, namely gallic acid, methyl gallate, epicatechin, epigallocatechin, epigallocatechin gallate, and epicatechin gallate. The binding force between tea polyphenols and the boronic acid probe is stronger than that of the indicator. Different tea polyphenols have different binding abilities to the probe and different abilities to displace the indicator, resulting in different colorimetric responses of the IDA sensor array to tea polyphenols. In addition, the colorimetric sensing array was combined with principal component analysis (PCA) to successfully distinguish different types of tea polyphenols.