40 results about "P-aminothiophenol" patented technology

The invention discloses a quick nitrite detection method based on nanogold. The method comprises steps as follows: a standard solution containing nitrite is added to an acid aqueous solution of p-aminothiophenol, nanogold sol is added after a period of incubation, the nanogold sol is detected by an ultraviolet-visible spectrophotometer, ultraviolet-visible absorption spectrum data are acquired, the specific value of the absorbance in 685 nm and 520 nm positions is taken as the longitudinal coordinate, the concentration of the standard solution containing the nitrite is taken as the horizontal coordinate, a standard curve of the nitrite is obtained through fitting, the A685 / A520 value of a to-be-detected solution containing nitrite is introduced into a function relation of the standard curve of the nitrite, and quantitative detection of the nitrite is realized. The method is simple in step, low in cost, good in selectivity, high in detection speed and broad in application prospect, the nanogold is not required to be modified, special instrument equipment is not required, the detection range of the nitrite concentration is wide, and convenient, quick and sensitive detection can be realized.

The invention discloses a p-aminophenyl-beta-hydroxyethyl sulfide preparation method comprising the steps that: (1) under the effect of a catalyst, sodium sulfide, sodium hydrosulfide and nitro chlorobenzene are mixed, such that nucleophilic substitution reaction, and nitro reduction reaction are carried out; and post-treatment is carried out, such that sodium p-aminothiophenol is obtained; (2) sodium p-aminothiophenol is subjected to a reaction with ethylene oxide, such that p-aminophenyl-beta-hydroxyethyl sulfide is obtained. According to the invention, a mixed solution of sodium sulfide and sodium hydrosulfide is used for replacing a polysulfide solution for carrying out the substitution and reduction reactions, such that the nucleophilic reagent SH<-> has high concentration at the beginning, and the substitution reaction can be smoothly carried out, side reaction can be inhibited, and yield can be improved. Ethylene oxide is used for replacing 2-chloroethanol in a condensation reaction with sodium p-aminothiophenol, such that production process is reduced, and production cost is reduced.

The invention discloses a method for forming a SERS active substrate by assembling gold nanoparticles to an electrostatic spinning polymer nanofiber membrane and aims at building the active SERS substrate for sensitive detection. The method is based on the gold nanoparticles assembled by the electrostatic spinning polycarpolaction nanofiber membrane; the method comprises the following steps: firstly, inducing the crylic acid to perform grafting modification on the hydrophobic surface of the polycarpolaction nanofiber membrane by adopting the ultraviolet light, and then soaking the polycarpolaction nanofiber membrane in a gold nanoparticle solution for promoting the gold nanoparticles to be assembled to the polycarpolaction nanofiber so as to form the SERS active substrate; a p-aminothiophenol (4-ATP) molecule is adopted as an experiment probe molecule for SERS research, and the research shows that the substrate has the high SERS response sensitivity; the method has great advantages on environment-friendly synthesis, large scale, high stability and good repeatability; the highly active SERS substrate can be used for probing medicine molecules such as 2-thiouracil.

The invention discloses a preparation method for an antistatic terylene tablecloth, and belongs to the technical field of textile materials. The preparation method comprises the following steps: carrying out continuous modification treatment on the terylene tablecloth sequentially through the mixed solution composed of Na2CO3 solution, N-(2-aminoethyl)-3-aminopropyl trimethoxy-silane and vinyl trimethoxy silane, and ammonium persulphate solution, then impregnating the terylene tablecloth in the mixed conjugated monomer solution composed of phenylamine and p-aminothiophenol, and carrying out polymerization reaction, washing and drying to prepare the antistatic terylene tablecloth under the synergistic effect of perchloric acid, 4-thiacalixarene sulfonated sodium and phenol red sodium salt. The antistatic terylene tablecloth prepared by the method disclosed by the invention has an electrical conductivity of 8.5*10<-3> to 3.6*10<-2> S.cm<-1>; the preparation method disclosed by the invention has the following characteristics that the preparation method is simple, and the product is excellent in antistatic performance, wide in applicability and the like.

The invention discloses a method for rapid on-site detection of formaldehyde and acetaldehyde in wine. The present invention uses a paper-based microfluidic analysis device μ-PAD to extract formaldehyde and acetaldehyde in edible wine samples, uses p-aminothiophenol ATP as a probe molecule, and uses silver nanoparticles Ag NPs prepared by silver mirror reaction as a surface-enhanced puller. With the enhanced substrate of Mann scattering, the relationship between the peak intensity of p-aminothiophenol and the content of formaldehyde or acetaldehyde is established by a portable Raman spectrometer, so as to realize the on-site rapid quantitative and qualitative detection of formaldehyde and acetaldehyde in the wine sample to be tested. Compared with the existing on-site rapid detection method of formaldehyde and acetaldehyde, the present invention has the characteristics of high selectivity, rapid analysis, high sensitivity, less sample consumption, wide application range, simple operation and convenient portability. The detection limits of this method were 0.0046 μM for formaldehyde and 0.0032 μM for acetaldehyde.

The invention discloses a method for fast detecting nitrite in food through fluorescent / colorimetric double probes. The method comprises the following steps of (1) preparing a gold nanometer rod modified by p-aminothiophenol; (2) preparing gold nanometer spheres modified by 1,8-diaminonaphthalene; (3) proportionally mixing the two kinds of nanometer materials; adding the mixture into the same kind of food to be tested with different known nitrite concentrations; obtaining optical photos in a fluorescent lamp and an ultraviolet lamp; (4) dripping the two kinds of nanometer materials mixed in the step (3) into the food to be tested; performing analysis and detection at the same time by a colorimetric method and a fluorescent method. The field fast qualitative and quantitive analysis on the nitrite in the food can be realized through comparing the color in the fluorescent lamp and the ultraviolet lamp. The method has the characteristics that the use cost is low; the instrument equipment is simple; the analysis is fast; the sensitivity is high; the sample consumption is low; the application range is wide, and the like. The field fast detection on the nitrite in the food can be realized.