19 results about "Thymol blue" patented technology

The present invention provides a visual indicator film for the freshness of fresh-cut fruits, a preparation method, the use and a detection method. The preparation method comprises the following steps: preparing a Co-based MOF; washing and activating the Co-MOF; preparing a CMC-Na-based thin film; and preparing a CMC-Na-based thin film, and thereby obtaining an indicator film for phenol red (PR) or an indicator film for bromothymol blue (BTB). In the present invention, an irregular spherical Co-based metal organic framework (Co-MOF) loaded with PR or BTB is prepared, and the nanocomposites Co-MOF / PR and Co-MOF / BTB are obtained after dyes and the MOF are adsorbed by means of the hydrogen bond interaction. Then, the nanocomposites are embedded into a sodium carboxymethyl cellulose (CMC-Na) base material to prepare CO2-responsive packaging materials, namely, a CMC-Na / PR / Co-MOF and a CMC-Na / BTB / Co-MOF, which are used for monitoring the freshness of fruits in real time and in situ. The Co-MOF-based composite thin film has good water resistance, time-temperature stability and mechanical properties, and also exhibits enhanced ultraviolet-visible light barrier properties, dye migration resistance and thermal stability. The visual indicator film for the freshness of fresh-cut fruits can effectively reflect the concentration of CO2, and is suitable for real-time and in-situ monitoring of the freshness of fruits.

The application discloses a chromogenic culture medium for detecting enteropathogenic Escherichia coli, which contains peptone, sodium pyruvate, sodium chloride, D-sorbitol, D-malic acid, bile salt, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, sodium hydroxide, kaolin, bromothymol blue, crystal violet, polyethylene glycol and agar, and the rest is water. The chromogenic culture medium is simple in composition, convenient to prepare and use, and can be used for identifying enteropathogenic Escherichia coli EPEC according to the color of bacterial colonies, and has the advantages of specificity, high efficiency, rapidness, low cost, simple result judgment and the like, and has a wide application prospect in food safety monitoring.

This invention belongs to the field of analytical chemistry technology, specifically relating to a composite indicator and testing method for determining cadmium content in crude cadmium. The composite indicator comprises xylenol orange, thymol blue, and sodium indigo disulfonate, with a mass ratio of xylenol orange, thymol blue, and sodium indigo disulfonate of 1.0–1.5:0.3–0.6:0.5–1.0. This invention utilizes the ternary compound of xylenol orange, thymol blue, and sodium indigo disulfonate, employing the blue background of sodium indigo disulfonate and the reddish-purple and yellow hues of xylenol orange for optical color adjustment. This transforms the color change at the titration endpoint from the traditional reddish-purple to yellow to a bluedish-purple to yellowish-green, significantly increasing the color difference and creating a clear and sharp color change interface, greatly improving the accuracy and reliability of visual endpoint determination.

This invention discloses a gel-like flange protection and monitoring material, its preparation method, and its application, belonging to the field of industrial flange protection and leakage monitoring technology. The material is a toothpaste-like extrudable colloid, comprising, by weight: 75-88 parts of protective matrix adhesive, 3-12 parts of pH-responsive core-shell microcapsules, 1-3 parts of interface compatibilizer, 2-5 parts of toughening modifier, 0.5-2 parts of anti-aging additive, 1-4 parts of thixotropic modifier, and 0.5-2 parts of anti-corrosion additive. The pH-responsive microcapsules use a compound of methyl red, bromocresol green, and thymol blue as the core material, with a particle size of 20-50 μm and a shell thickness of 2-3 μm. This invention replaces traditional flange covers with an extrusion coating method, eliminating the need for bolt fixing. It is suitable for flanges of various sizes, providing physical protection against impacts, dust, and media splashes. Simultaneously, it rapidly develops color when acidic or alkaline media leak, enabling naked-eye visual monitoring of the leakage location. It is convenient to construct and simple to maintain, and is suitable for flange protection in industries such as chemical, petroleum, water, and energy.

The invention discloses a method for detecting the content of free carbon in a tungsten-titanium solid solution, and belongs to the field of analytical chemistry. According to the method, based on the adsorption effect of the free carbon on bromothymol blue, an adsorption reaction is carried out in an acidic buffer system, and selective adsorption of the free carbon is realized; and then carrying out solid-liquid separation, alkalifying the filtrate, measuring the absorbance under the wavelength of 574nm, and calculating the content of free carbon by using a standard curve method according to the absorbance difference. The method has the advantages of simplicity and convenience in operation, low cost, no use of strong corrosive acid, environmental friendliness and the like. Compared with a high-frequency infrared method, the precision is remarkably improved, and the method is suitable for rapid and accurate determination of free carbon in the tungsten-titanium solid solution.

The present invention provides a cleaning composition containing alkaline electrolyzed water, which facilitates the production of a diluted solution having a predetermined pH. [Solution] A cleaning composition is provided which contains bromothymol blue, thymol blue, or phenolphthalein as a pH indicator, and alkaline electrolyzed water having a pH of 12 or higher.

According to the pH detection cat litter based on the plant particles and the preparation method of the pH detection cat litter based on the plant particles, the plant starch particles with the neutral pH are selected as inner cores, and interference of traditional mineral matrix alkalinity deviation on the detection accuracy is effectively avoided; in combination with a polymer coating fixed bromothymol blue and methyl red double indicator system, by utilizing the complementary characteristic of color change intervals of bromothymol blue and methyl red, the obvious color change from orange red to green is realized at the critical threshold of cat urine pH 6.8-7.0, and the problems of blurred color development and difficulty in identifying a transition region in the prior art are solved. Meanwhile, the storage stability and the liquid response speed of the indicator are effectively improved.

The invention relates to the technical field of preparation of water quality purification resin, and discloses color-changing type water quality purification resin and a preparation method thereof, and the color-changing type water quality purification resin is prepared from a methyl red structure modified monomer, a thymol blue structure modified monomer, sodium p-styrenesulfonate, divinylbenzene, a magnetic response enhanced monomer, a photoinitiator, a thermal initiator, polyvinyl alcohol, sodium dodecyl benzene sulfonate and ionized water. The preparation process comprises the following steps: preparing methyl red and thymol blue modified monomers; preparing a magnetic response enhancing monomer; uniformly mixing each monomer with an initiator; carrying out suspension polymerization on the mixed monomer to prepare resin microspheres; and filtering, washing and drying the resin microspheres. According to the invention, the response characteristic of the functional monomer is kept in a resin microenvironment through the design of a synergistic copolymerization network, the influence of external temperature fluctuation on a color change point is reduced, the resin can provide accurate saturation indication at different environment temperatures, and a polymer skeleton has a protective effect on functional components, so that the service life of the resin is prolonged. The oxidation resistance and the hydrolysis resistance are enhanced.

The invention discloses a double-layer hydrogel dressing for chronic wound diagnosis and treatment and a preparation method thereof. The dressing is formed by compounding a pH response monitoring layer and an anti-inflammatory and antibacterial treatment layer. The monitoring layer is loaded with bromothymol blue, visual color response can be generated according to the pH change of the wound microenvironment, and real-time monitoring of infection is achieved; the treatment layer takes a methacrylated gelatin / sodium alginate dual-network as a base material, is loaded with quercetin liposome and copper ions, and has long-acting anti-inflammatory and efficient antibacterial functions. The mechanical performance of the hydrogel is enhanced by constructing a double-network structure, and in-vitro experiments prove that the hydrogel has excellent pH visual response performance and broad-spectrum killing capacity on various pathogenic bacteria. The real-time diagnosis and treatment functions are integrated, and the method has important application prospects in the aspects of accurate management and healing promotion of diabetic chronic wounds.

The application discloses a flexible wearable bifunctional colorimetric gas sensor patch as well as a preparation method and application thereof, and belongs to the field of sensors. The bifunctional colorimetric gas sensor patch uses thymol blue and hydroxylamine sulfate as response materials, and is designed as a high-sensitivity, low-cost and wide-range sensor, which can simultaneously detect acetone gas in a range of 1-40 ppm and HCl gas in a range of 100-900 ppm. The color data collected by the sensor can be converted into gas concentration by using a deep neural network, so that the precise gas concentration detection function is realized, and real-time gas leakage monitoring and early warning can be realized on a site such as a chemical working site.

The invention discloses a method for detecting the content of magnesium in a zinc-aluminum-magnesium plating solution, and belongs to the technical field of chemical analysis. The detection method comprises the following steps: (1) preparing a sample; (2) preparing mother liquor; (3) testing the total amount of zinc and magnesium: adjusting the pH value to 10.0 by using an NH3-NH4Cl buffer solution, masking iron and aluminum by using a masking agent, and determining the total amount of Zn < 2 + > and Mg < 2 + > by using a chrome black T + methyl thymol blue composite indicator; (5) magnesium content testing: subtracting the volume (V2) of EDTA consumed by Zn < 2 + > from the total volume (V1) of EDTA consumed by zinc and magnesium to obtain the volume of EDTA consumed by Mg < 2 + >; then the magnesium content is calculated through a formula; and (6) blank testing. Compared with ICP, the detection scheme is rapid and accurate, the detection cost is low, and the detection range is wide.

This invention discloses a method for preparing and applying an antibacterial hydrogel biomimetic skin. The antibacterial hydrogel biomimetic skin comprises an N-isopropylacrylamide and [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide hydrogel matrix, and a photothermal filler and bromothymol blue indicator loaded within the hydrogel matrix. The photothermal filler is assembled from silver nanoparticles with antibacterial properties and two-dimensional transition metal carbon / nitrides. This antibacterial hydrogel biomimetic skin resembles human skin, possessing multiple resistance mechanisms against bacteria: antifouling, detection, inactivation, and self-cleaning. The hydrogel matrix of this antibacterial hydrogel biomimetic skin is temperature-sensitive, with a controllable peak temperature, achieving intelligent antibacterial protection when combined with photothermal sterilization technology; the inactivation rate against *Escherichia coli* and *Staphylococcus aureus* is 100%. The preparation method of this invention is simple, low-cost, and requires minimal equipment investment, making it suitable for medical and health applications, especially for the protection of medical devices and biomaterials.

The invention discloses a preparation method of polymer hydrogel for detecting volatile aldehyde compounds, and the method at least comprises the following steps: I, mixing and stirring an aqueous solution I containing polyvinyl alcohol and an aqueous solution II containing cane sugar to obtain transparent hydrogel; iI, standing the transparent hydrogel obtained in the step I, and cutting the transparent hydrogel into thin film hydrogel; and step III, soaking the film hydrogel obtained in the step II in an indicator solution, and drying to obtain the polymer hydrogel containing an indicator which is hydroxylamine hydrochloride and thymol blue. The detection material is high in selectivity, high in sensitivity, rapid in detection and suitable for field detection of various application scenes.

The present application belongs to the technical field of label printing or radiation sterilization, and particularly relates to a label with radiation color change indication and radiation dose detection, a preparation method thereof, and a radiation dose detection method. The preparation method of the label comprises the following steps: mixing thymol blue, alcohol, alcohol-soluble acrylic resin, a buffer solution, chloral hydrate, and a leveling agent to obtain composite ink; performing positioning and quantitative inkjet printing of the composite ink on the surface of an adhesive label, and drying to form an ink layer, thereby obtaining the label with radiation color change indication and radiation dose detection. The label can indicate whether the goods have undergone a sufficient dose of radiation according to the color change after radiation, and the size of the radiation dose can be obtained according to a radiation dose standard color chart. The label has good color consistency before and after undergoing the same dose of radiation, and the obtained radiation dose result is accurate and reliable.

This invention relates to the field of polymer materials technology, and in particular to an aromatic dissolution-separation type color-changing microneedle patch, its preparation, and its application in the preparation of products for treating diabetic foot ulcers. The microneedle patch comprises a needle layer and a substrate layer placed beneath the needle layer; the needle layer is formed by compounding self-assembled carrier-free nanoparticles containing thymol and an aqueous solution of hyaluronic acid; the substrate layer is formed by compounding an aqueous solution of bromothymol blue and polyvinyl alcohol. The aromatic dissolution-separation type color-changing microneedle patch prepared by this invention possesses the ability to rapidly absorb moisture and self-dissolve after penetrating the skin, without remaining in the body, thus improving biocompatibility and promoting transdermal absorption of active substances, thereby achieving a slow and controllable release of fragrance from within the skin tissue; this microneedle patch has triple effects of antibacterial, anti-inflammatory, and antioxidant properties, opening a new path for the clinical application of diabetic foot ulcers.

The invention discloses a preparation method of polymer hydrogel for detecting ester compounds, and the method at least comprises the following steps: 1, dispersing polyethylene glycol, polyvinylpyrrolidone and acrylamide in deionized water, adding an indicator solution and an initiator, and reacting to obtain transparent hydrogel; 2, the transparent hydrogel obtained in the step 1 is soaked in deionized water and dried, the polymer hydrogel for detecting the ester compounds is obtained, and the indicator solution is a mixture of phenolphthalein and thymol blue. The hydrogel immobilized indicator can react with the ester compounds to generate color change, the detection sensitivity is high, the stability is good, the operation is simple and convenient, the use of a large number of chemical reagents is not involved, no waste liquid is generated, the method is environment-friendly, and the detection requirements of the related ester compounds in various application scenes are met.

This invention relates to a charge transfer complex hydrogel, its preparation method, and its application. The charge transfer complex hydrogel comprises: a solution of charge transfer complex nanoparticles and a bromothymol blue solution, wherein the charge transfer complex nanoparticles are 3-AP-TQ NPs, Per-TQ NPs, 3-BrP-TQ NPs, or 3-PCA-TQ NPs. The charge transfer complex hydrogel of this invention possesses the following functions: highly efficient photothermal antibacterial properties: utilizing the photothermal effect of NIR-II CTCs, localized high temperatures are generated under laser irradiation to kill drug-resistant bacteria; real-time infection monitoring: the degree of infection is visually indicated by the sensitive color change of BTB on wound pH; ideal dressing properties: relying on a carrageenan base, it provides a suitable moist environment, permeability, and mechanical support.

The application discloses a kind of detection methods of magnesium content in zinc-aluminum-magnesium plating solution, belong to chemical analysis technical field.The detection method includes: (1) sample preparation;(2) preparation of mother liquor;(3) zinc, magnesium total amount test: first using NH3-NH4Cl buffer solution to adjust pH=10.0, using masking agent to mask iron and aluminum, chromium black T+methyl thymol blue composite indicator is determined Zn 2+ , Mg 2+ Total amount, (4) zinc content test;(5) magnesium content test: the volume total amount (V1) of zinc, magnesium consumption EDTA is subtracted Zn 2+ Consumption volume amount (V2) of EDTA obtains Mg 2+ Consumption volume amount of EDTA;Then magnesium content is obtained by formula calculation;(6) blank test.The application compared with ICP, detection scheme is fast and accurate, detection cost is low and detection range is wide.