7 results about "Tartrazine" patented technology

This invention discloses a non-toxic liquid chromatography teaching aid, comprising a medium-pressure liquid chromatography column with an aspect ratio of not less than 10, activated amorphous silica gel, a syringe, a pre-dispensed mixture of target compounds, and pre-dispensed food-grade citric acid. The pre-dispensed mixture of target compounds is a mixture of carmine, tartrazine, and brilliant blue. This invention does not use harmful solvents or reagents, and the separation time is significantly reduced to less than 3 minutes. Furthermore, the chromatographic column used as a teaching aid can be reused multiple times. The actual separation cost is only pure water and food coloring solution, greatly improving the feasibility of chromatography teaching experiments.

The invention relates to an electrochemical sensor for detecting food synthetic pigment, an electrode and a preparation method thereof, the electrode comprises a graphite paper substrate and a graphene nanosheet layer distributed on the surface of the graphite paper substrate, and the graphene nanosheet layer stands on the graphite paper substrate in a vertical or inclined state relative to the graphite paper substrate. The graphene nanosheet layer is seamlessly connected with the graphite paper substrate; the graphene nanosheet layer and the graphite paper substrate are an integrally formed product prepared by performing surface electrochemical stripping on a piece of graphite paper; lysine molecules are distributed on the surface of the graphene nanosheet layer; the food synthetic pigment is an azo group-containing synthetic pigment. The electrode has the beneficial effects that the electrode has a relatively strong catalytic effect on oxidation of amaranth and lemon yellow, and has the advantages of rapidness, practicability, relatively wide linear range, relatively low detection limit and relatively good reproducibility.

The application discloses a kind of Co nanoparticle loaded carbon nanotube magnetic functional materials (Co@CNTs) preparation. Due to the synergistic effect of Co nanoparticle and carbon tube, the material shows excellent electrocatalytic, conductivity, fast electron transfer ability. Combined with the design of magnetic base and screen printed electrode (SPE), a kind of renewable magnetic screen printed electrode is developed. Among them, the presence of Co@CNTs greatly improves the electron transfer dynamics of hydrazine hydrate and tartrazine on the surface of SPE. The linear range of Co@CNTs / SPCE for hydrazine hydrate and tartrazine detection is 0.1~50.0 mM and 0.04~30.0 mM, and the detection limit is 50 nM and 12 nM respectively. Since Co@CNTs is attached to the surface of SPE by magnet control, and is easy to separate from the electrode surface by magnet, the sensor structure is simple, renewable and low cost.

Methods, systems, apparatuses, and computer program products are described herein for printing artificial constructs or tissue models from a bioink using digital light processing (DLP). Bioinks can include polyethylene glycol diacrylate (PEGDA), gelatin methacrylate (GelMA), hyaluronic acid methacrylate (HAMA), lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP), tartrazine, arginine-glycerine-aspartic acid (RGD), isoleucine-lysine-valine-alanine-valine (IKVAV), and Dulbecco's Phosphate-Buffered Saline (dPBS) pH buffered with calcium and magnesium. Such bioinks can result in printed constructs that exhibit improved vascularity / perfusability and improved stem cell growth and regulation. Bioink can be formed by vortexing a solution of PEGDA, GelMA, HAMA, LAP, tartrazine, RGD, IKVAV, and / or dPBS at a temperature of, e.g., about 60°C or greater. DLP bioprinting can be carried out layer-by-layer with an average thickness of each layer being between about 25 µm and about 100 µm. Average light intensity emitted during DLP bioprinting can be between about 10 mW / cm2 and about 30 mW / cm2.

The invention provides novel fluorescent gold and silver nanoparticles, and relates to the technical field of fluorescent materials, and a synthesis method of the novel fluorescent gold and silver nanoparticles comprises the following steps: under a water bath condition, adding a lemon yellow solution, and adding metal precursors chloroauric acid and silver nitrate to obtain a mixed solution; a certain amount of sodium hydroxide is used for adjusting the pH of the mixed solution, stirring reaction continues, the mixed solution becomes dark brown from light yellow, centrifugation is conducted, supernate is taken and stored in a dark place, and the novel fluorescent gold and silver nanoparticles are obtained. The fluorescent material has ultraviolet and fluorescent optical properties, the synthesis method is simple, the cost is low, and the synthesized fluorescent material is non-toxic and can be used for detecting free chlorine in water.

This invention discloses a method for synthesizing a standard sample for detecting tartrazine intermediates as shown in structural formula 1, characterized by the following reaction formula 1. This patent provides a method for preparing a standard sample for detecting the content of tartrazine intermediates, the structure of which is shown in structural formula 1, enabling rapid and accurate quantitative detection of 1-(4'-sulfonylphenyl)-3-carboxylic acid methyl ester-5-pyrazolone monosodium salt in tartrazine.

The invention belongs to the technical field of pigment synthesis, discloses halogenated ornamental blue as well as a preparation method and application thereof, and breaks through a traditional amino modification-based derivation path of ornamental blue. Halogen is introduced into a main molecular structure of ornamental blue, and 5, 5-dihydroxy ornamental blue reacts with a specific halogenating agent to prepare the blue-light-emitting material. During preparation, 5, 5-dihydroxy blue and a halogenating agent react for 1-2 hours at the temperature of 20-30 DEG C in solvents such as dioxane and acetonitrile according to the molar ratio of 1: 1-1: 3, and a product can be obtained through ice water quenching, filtering, washing and drying. The synthesis method is simple and convenient, and post-treatment is simple. The halogenated ornamental blue is excellent in dyeing performance, the K / S value exceeds 10, the dye uptake exceeds 91%, and the color fastness to sun, washing and wet rubbing reaches level 5, which is obviously superior to that of lemon yellow and 5, 5-dihydroxy ornamental blue, so that the halogenated ornamental blue not only can be used for dyeing, but also can be used as an intermediate for synthesis of other derivatives, and the family structure and the application scene of the ornamental blue are enriched.