13 results about "Bromocresol purple" patented technology

An object of the present invention is to provide a test piece for measuring albumin, which is not affected by globulin or coexisting substances in serum, have high measurement accuracy, and have good repeatability, and to provide a method for measuring albumin.According to the present invention, there is provided a test piece for measuring albumin, including a support and a reagent holding layer provided over the support, in which the reagent holding layer contains a protein denaturant, an SH reagent, bromocresol purple, and a nonionic surfactant, a content of the bromocresol purple in the reagent holding layer is 0.78 g / m2 to 3.81 g / m2, and a ratio of a content of the nonionic surfactant to the content of the bromocresol purple is 0.01 to 0.3.

The invention relates to the field of cables, in particular to a weather-proof low-voltage cable and a preparation method thereof. The invention discloses a weather-resistant low-voltage cable and a preparation method thereof, the weather-resistant low-voltage cable comprises a conductor, an insulating layer, a shielding layer and a protective layer, the insulating layer comprises the following raw materials in parts by weight: 100-150 parts of thermoplastic polyurethane, 1-2 parts of a light stabilization system, 2-4 parts of environmental response microcapsules, 1.5-2.5 parts of fumed silica, 11-16 parts of a flame retardant and 0.5-0.7 part of a processing aid; the environment response microcapsule takes polyurethane as a wall material and bromocresol purple and a siloxane self-repairing agent as core materials. According to the cable, free radicals initiated by ultraviolet rays are captured through a light stabilization system, oxidative degradation of matrix resin is inhibited, and the service life of the cable in outdoor ultraviolet and high and low temperature alternating environments is prolonged. And meanwhile, the environment response microcapsules are added, so that the aged and cracked insulating layer is continuously repaired in time, and the anti-aging effect of the cable is greatly improved.

The utility model relates to the technical field of dairy products, and discloses a dairy product freshness indicating label which comprises an annular indicating shell arranged on a dairy product bottle opening and further comprises a connecting groove formed in an inner cavity of the annular indicating shell, and a pH sensitive gel sheet material is arranged in the connecting groove. Threaded strips are arranged in the annular indicating shell. Firstly, a transparent acrylic observation ring is integrated at the top of an annular indication shell, and is matched with a built-in pH sensitive gel sheet material, so that visual monitoring of the freshness of the dairy product is realized, and the working principle is as follows: when microorganisms metabolize to produce acid in the product storage process, the headspace COconcentration in a bottle is increased, acid gas permeates a special PTFE microporous membrane, and the pH sensitive gel sheet material is detected; when the product is in use, the product reacts with a pH sensitive gel sheet formed by compounding agarose / gelatin and bromcresol purple, a consumer can visually judge the state of the product through an observation window only by opening a sealing cover, purple represents freshness, yellowish purple indicates that the product is close to the shelf life, and yellow represents that the product is deteriorated.

The application provides a method for detecting plant growth hormone-like substances in sludge stabilization products, comprising the following steps: contacting the root system of a plant with a sludge extract solution added with CaCl2 to activate a messenger; transferring the plant treated by the activated messenger to an agar gel layer plate added with bromocresol purple indicator; observing the color development of the agar gel layer plate during the culture process; and judging the content of the plant growth hormone-like substances in the sludge extract solution according to the color development. The method for detecting plant growth hormone-like substances in sludge stabilization products provided by the application is based on the acidification degree of the root system of a plant, takes bromocresol purple as an indicator, and combines color development with a plant water culture experiment, so that simple, rapid and low-cost qualitative detection of the plant growth hormone-like substances in sludge stabilization products is realized.

The invention relates to the technical field of medical dressings, and particularly discloses a discoloring dressing capable of tracing retention time and a preparation method thereof, the discoloring dressing comprises a base material layer, a time indication layer, an oxygen sensitive composite film and a microbial response layer; the base material layer is formed by one of medical non-woven fabric and polyurethane foam; the time indication layer is arranged on the upper surface of the base material layer and comprises a pH response type color-changing material; the oxygen-sensitive composite film covers the surface of the time indicating layer and comprises platinum (II)-tetraphenyl porphyrin ketone (PtOEPK) dispersed in a polydimethylsiloxane (PDMS) matrix, and the color change of the oxygen-sensitive composite film is related to the tissue oxygen partial pressure; through the arrangement of the time indication layer, a compound of bromcresol purple and bromothymol blue is adopted as a pH response type color change material, so that the dressing can present gradient color changes of yellow, green and blue according to the pH change of a wound in the retention process, the retention time of the dressing is visually displayed, and medical staff can conveniently judge the replacement time.

The invention provides a GIS sulfur hexafluoride gas leakage detection color-changing adhesive tape and a preparation method thereof, and relates to the technical field of electrical equipment gas leakage detection.The GIS sulfur hexafluoride gas leakage detection color-changing adhesive tape comprises an adhesive tape body, a groove is formed in the top of the adhesive tape body, a carrier soaked with an alkaline solution is embedded in the groove, and the carrier soaked with the alkaline solution loads an indicator. The adhesive tape main body is a nano adhesive tape and has high adhesion and weather resistance. The indicator comprises any one of bromcresol purple, phenolphthalein and methyl orange, the alkaline solution comprises a potassium hydroxide solution or a bicarbonate solution, and the carrier is a porous fiber material or hydrogel. The SF6 leakage detection adhesive tape is low in cost and easy and convenient to operate, and leakage points are visually positioned through color changes.

The invention provides a novel method for rapidly screening and accurately analyzing the quaternary ammonium salt surfactant. In order to solve the problems of weak selectivity or long time consumption and high cost of a detection method in the prior art, a sodium tetraphenylborate-bromcresol purple-phosphate buffer salt mixed solution is adopted as a probe solution, quaternary ammonium salt surfactants in a sample are rapidly identified through probe reaction, a positive sample is subjected to high-speed centrifugation, dissolution and precipitation, and the content of the quaternary ammonium salt surfactants in the sample is detected. Further liquid chromatography-mass spectrometry analysis is carried out, so that accurate qualitative and quantitative analysis on the quaternary ammonium salt surfactant is realized. The method can effectively meet the requirements of rapid screening and accurate analysis, has important practical value and wide application prospect, and can remarkably improve the working efficiency and reduce the analysis cost especially in the fields of environmental protection, daily chemical management and the like.

This invention belongs to the field of microbial culture technology. It provides a method for culturing cariogenic acid-producing anaerobic bacteria and its application. The culture medium comprises the following components in the following proportions: peptone 0.5-5%, sucrose 1-10%, sodium chloride 0.1-0.6%, bromocresol green 0.1-0.3%, bromocresol purple 0.01-0.15%, vitamin C 0.01-0.05%, Tween-80 0.01-0.06%, phenylethanol 0.01-0.25%, and deionized water, forming a liquid culture medium. Based on the specific requirements of bacterial culture, this invention is used for culturing bacteria from teeth and the oral cavity. Peptone is used as the nitrogen source, and sucrose as the carbon source. When bacteria multiply rapidly, they convert sucrose into an acidic substance, changing the pH of the culture medium. In the presence of bromocresol green / bromocresol purple, the color of the culture medium changes, allowing for the determination of bacterial content in the sample and the prediction of the risk of dental caries.

The present invention provides a Legionella Bozemania isolation culture medium and a preparation method thereof, which are used for selectively isolating and culturing Legionella Bozemania, and belong to the field of microbial technology. Its components include: sodium pyruvate, yeast extract powder, α-ketoglutaric acid, ferric nitrate, activated carbon, carbon black, L-cysteine ​​hydrochloride, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, glycine, bromocresol purple, bromocresol green, agar, vancomycin, natamycin, polymyxin B, and potassium hydroxide. By simple dissolution and mixing, high-temperature sterilization, and aseptic filling, a culture medium suitable for the isolation and cultivation of Legionella Bozemania is prepared. The culture medium of the present invention can accurately and quickly screen out Legionella Bozemania through simple isolation and cultivation, has high efficiency and specificity, is easy to obtain raw materials, effectively reduces costs, is convenient and quick to use, reduces the contamination risks and cumbersome procedures brought by self-prepared culture media, and is suitable for standardization and specialized research.

The present invention relates to a pH color-changing calcium alginate hydrogel sheet and a preparation method thereof, and belongs to the field of biomedicine technology. The preparation method comprises the following steps: S1, mixing a pH color-changing nanocapsule suspension and a sodium alginate solution to obtain a mixed solution; the pH color-changing nanocapsule is prepared by instantaneous nanoprecipitation technology, using ethyl cellulose as a polymer wall material and thymol blue, bromocresol green and bromocresol purple as core materials; S2, vertically immersing a sheet substrate in the mixed solution and then pulling it upward, while spraying a calcium salt solution on the surface of the sheet substrate after pulling out the liquid surface to obtain a pre-coagulated sheet substrate; S3, immersing the pre-coagulated sheet substrate in a calcium salt solution, and repeating S2-S3 steps 2-5 times to obtain a pH color-changing calcium alginate hydrogel sheet. The pH color-changing calcium alginate hydrogel sheet of the present invention has a pH color-changing function, can play an early warning prompt role for inflammation of a wound, and can also be applied to urine pH detection and the detection of whether foods such as meat are spoiled or not.

The application relates to the field of cables, in particular to a weather-resistant low-voltage cable and a preparation method thereof. The weather-resistant low-voltage cable and the preparation method thereof comprise a conductor, an insulation layer, a shielding layer and a protective layer, the insulation layer comprises the following raw materials in parts by weight: 100-150 parts of thermoplastic polyurethane, 1-2 parts of a light stabilizing system, 2-4 parts of environment-responsive microcapsules, 1.5-2.5 parts of fumed silica, 11-16 parts of a flame retardant and 0.5-0.7 parts of a processing aid; the environment-responsive microcapsules take polyurethane as a wall material and take bromocresol purple and a siloxane self-repairing agent as core materials. The cable of the application captures free radicals caused by ultraviolet rays through the light stabilizing system, inhibits the oxidative degradation of the matrix resin, prolongs the service life of the cable in an outdoor ultraviolet light and high-low temperature alternating environment. Meanwhile, the environment-responsive microcapsules are added to continue timely repair of the aging and cracked insulation layer, greatly improving the anti-aging effect of the cable.

The invention belongs to the technical field of detection, and particularly relates to a detection method of ammonium fluoride. The detection method comprises the following steps: S1, detecting the concentration of free acid in an ammonium fluoride product by adopting a titration method, S2, adding a formaldehyde aqueous solution into the product obtained after detection in the step S1, and S3, detecting the concentration of ammonium fluoride in the product in the step S2 by adopting a titration method. Compared with an existing detection method in which the concentrations of the free acid and the ammonium fluoride are respectively detected, the method has the advantages that two independent steps are combined into two continuous steps, the processes of reagent preparation and the like are reduced, the detection efficiency is improved, the method is more suitable for automatic detection, and the efficiency and the accuracy are further improved. During manual acid-base titration, bromothymol blue is used as an indicator, and compared with bromocresol purple and phenolphthalein which are used as titration indicators in the prior art, the titration end point judgment is accurate and is closer to neutral, so that the obtained concentrations of free acid and ammonium fluoride are more accurate compared with the prior art.

The invention discloses a decayed tooth pathogenic bacterium culture medium and a preparation method thereof, and relates to the field of microorganism culture and detection, and the key point of the technical scheme is that the culture medium comprises a culture solution and a hydrogen ion sensing membrane; the hydrogen ion sensing membrane is arranged in the culture solution; the formula of the hydrogen ion sensing membrane comprises a hydrogen ion probe, a cross-linkable ionic polymer, a cross-linking agent and a nano inorganic filler, the hydrogen ion probe is a mixture of at least one of bromcresol purple, bromcresol green, phenol red and methyl red and resorufin amyl ether; the hydrogen ion probe, the cross-linkable ionic polymer, the nano inorganic filler and the cross-linking agent are mixed and then cured to form the hydrogen ion sensing membrane. The aim of conveniently detecting the pathogenic bacteria is fulfilled.