47results about How to "Realize separation detection" patented technology

The invention discloses an optical fiber Bragg grating pressure sensor and a corresponding measurement method thereof, and the sensor comprises a housing, an elastic diaphragm, an L-shaped uniform strength beam and an optical fiber Bragg grating, wherein an opening is arranged at the top end of the housing, the opening and internal space of the housing constitute a cavity body, the elastic diaphragm covers the opening, the uniform strength beam is arranged in the cavity body, a pressure block is arranged at the free end of a beam arm of the uniform strength beam, a hard boss which is tightly connected with the pressure block is arranged on the lower surface of the elastic diaphragm, the optical fiber Bragg grating is mainly constituted by connecting two Bragg gratings with the identical temperature gradient in series through an optical fiber, and the two Bragg gratings are respectively connected on the upper surface and the lower surface of the beam arm. The sensor has the advantages that the elastic diaphragm is in rigid connection with the beam arm during the design, thereby not only improving the measurement precision, but also reducing the process difficulty; as the optical fiber Bragg grating is mainly constituted by the two Bragg gratings with the identical temperature gradient, the sensor can solve the temperature cross sensitivity problem during the measurement.

The invention relates to a detection technique for conductance which is a detecting apparatus and method for separation detecting of capillary electrophoresis, electricity chromatogram and microcylinder liquid phase chromatogram. This invention comprises function signal generator, detecting electrode, electrode fixing device, signal processing circuit, wherein the two detecting electrodes are in telescopic tubular shape and are directly covered on both ends of capillary; and electrode fixing device is composed of two boards with notches in and two detecting electrodes are located in the notches and are connected separately with signal processing circuit; the above components are set in one metal shielding box; the guiding means of capillary is fixed on the side wall of the box; and the guiding wire of detecting electrode is led by the guiding hole and thus is connected with output edge of function signal generator. This invention is of simple structure and high accuracy and good utilization.

The invention relates to an application of graphene quantum dot in a hydrophilic chromatographic analysis. The method comprises the following steps: 1) bonding the graphene quantum dot on silica gel;2) filling a chromatographic column with the graphene quantum dot-modified silica gel; and 3) performing separating analysis on an analyte. The graphene quantum dot can be taken as a hydrophilic chromatogram fixed-phase component, hydrophilic performance of the fixed-phase is enhanced, and the fixed phase contains a plurality of strong-polar functional groups, so that a plurality of strong-polar substances can be kept and separated. The graphene quantum dot can be used as the effective components of the hydrophilic chromatogram fixed-phase, the preparation is simple, and stability is high.

The invention relates to the technical field of analysis and detection, in particular to a method for simultaneously determining 19 sun-screening agents in cosmetics. The method comprises the steps ofpreparation of a mono-standard mother solution, preparation of mixed standard solutions, preparation of a series of mixed standard solutions, preparation of test product solutions and liquid chromatography determination. Response values of a series of mixed standard solutions and the test product solutions are in a linear range of instrument detection, are qualitative according to peak retentiontime and are quantitative according to peak area. The sample processing method is simple and effective. Simultaneous separation and detection of 19 sun-screening agents on a C18 chromatographic columnare achieved. The method is simple, convenient, environmentally friendly, high in accuracy and good in repeatability and durability.

The invention relates to mixed fillers of a liquid-phase chromatographic column and the chromatographic column, and relates to the technical field of analytical chemistry. The mixed fillers of the liquid-phase chromatographic column comprise long-chain alkyl dimethyl silane bonded silica gel and acylamino silane bonded silica gel in a weight ratio of 10:1-1:10, wherein the difference of the mean particle diameter is in a range of between -20 and 20 percent and the difference of the specific weight is in a range of between -20 and 20 percent. In the chromatographic column made by the mixed fillers, the mixed fillers are filled in a column pipe; the outer sides of the two ends of the column pipe are connected with a pipeline through internal thread; the inner sides of the two ends of the column pipe are provided with sieve plates used for preventing the mixed fillers from leaking outwards; one end of the column pipe is provided with a liquid inlet; and a mobile phase enters the chromatographic column from the liquid inlet. The characteristics of the mixed fillers of the liquid-phase chromatographic column are applied to chromatographic separation under the condition of the mixed mobile phase containing acetonitrile and aqueous solution, wherein the separation application is the chromatographic separation and detection of a sample containing a compound with extremely strong hydrophilism and a compound with extremely strong lipotropism simultaneously; and the separation detection of all the components can be performed once under the condition of equal-grade liquid-phase chromatogram.

The invention discloses an analysis method for a variety of sugar phosphate compounds including endogenous trehalose-6-phosphate in a plant sample. The method comprises the following steps of: extracting the endogenous sugar phosphates through a solvent; adsorbing and removing the hydrophobic impurities in the extracted solution through a reversed-phase SPE column; using the diazo groups in a derivatization reagent to carry out derivatization reaction on the phosphate groups common to the sugar phosphate compounds; and in combination with the liquid chromatography and mass spectrometry, realizing the separation detection of the endogenous sugar phosphate isomers in the plant sample. The analysis method is simple, accurate and high in throughput, can achieve the baseline separation of the sugar phosphate isomers on a hydrophilic chromatographic column and guarantee the higher detection sensitivity, and finally can realize the separation detection of the endogenous sugar phosphates in amicroplant tissue sample.

The invention relates to the field of gas detection and the field of optical sensing, and particularly provides an online hydrogen purity detection instrument as well as a use method and application thereof. The hydrogen purity online detection instrument comprises: a gas separation module and a light source (3), wherein each component gas in gas to be detected is separated in the gas separation module, the light source has the functions of current regulation and temperature regulation, and the line width of an emitted beam is far smaller than the single absorption line width of the gas to be detected and the spectral line width of a traditional infrared light source, and the separated gas is irradiated by the light source (3) to obtain a light signal; and a signal processing unit which is used for processing the optical signals to obtain spectral data of each gas in each time period, and is matched with analysis software to obtain composition data of the gas to be detected. The problems that in hydrogen purity detection in the prior art, impurity content analysis is insufficient, only single-point detection can be achieved in a detection area, the gas cross interference phenomenon is serious, gas detection consumes long time, and online detection cannot be achieved are solved.

The invention relates to a method for detecting cetilistat in a weight-losing health-care product. The method comprises the following steps: providing a reference substance solution, wherein a reference substance in the reference substance solution contains cetilistat; taking a weight-losing health-care product sample, extracting with methanol, collecting an extracting solution, and preparing a test solution; and detecting the reference solution and the test solution by adopting a high performance liquid chromatography-tandem mass spectrometry method, and determining whether the weight-losing health-care product sample contains the cetilistat or/and the content of the cetilistat according to a detection result. According to the method disclosed by the invention, the separation and detection of the cetilistat in the weight-losing health-care product are realized by adopting a proper extraction solvent and matching with proper detection conditions, the technical blank of the detection of the cetilistat in the weight-losing health-care product is filled, and a theoretical basis is laid for applying a high performance liquid chromatography-tandem mass spectrometry technology to the detection of the cetilistat in the weight-losing health-care product.

The invention provides a biogenic amine detection method based on time-resolved dynamic thermal desorption ion mobility spectrometry, which adopts a thermal desorption sampler to realize time-resolved sample introduction of different biogenic amines based on different thermal desorption characteristics of various biogenic amines; meanwhile, reagent molecule-assisted positive ion photoionization ion mobility spectrometry is adopted for detecting the biogenic amines, and the detection sensitivity and recognition accuracy of the biogenic amines are improved through reagent molecule screening, so that the simultaneous rapid detection of various biogenic amines is realized. The method provided by the invention can realize simultaneous accurate quantification of multiple mixtures, and has the advantages of high sensitivity, fast detection speed and portable instrument.