40results about How to "Meet the needs of actual testing" patented technology

The invention discloses a liquid-phase detection method for casein phosphopeptides in milk. The liquid-phase detection method comprises the following steps of adding casein phosphopeptides to milk to be detected to prepare a 10-100ppm casein phosphopeptides dispersion solution, carrying out decalcification through cation exchange resin after deproteinization, performing impurity removal and enrichment on an eluant obtained after the deproteinization through the cation exchange resin, carrying out vacuum rotary evaporation on a collecting liquid at the temperature of 60-70 DEG C at the revolving speed of 50-60rpm, and filtering through a membrane to take the collecting liquid as a liquid-phase detection sample; and carrying out liquid-phase detection on the liquid-phase detection sample, and calculating the concentration of the casein phosphopeptides added to the milk by using a peak area method according to an external standard method. The liquid-phase detection method provided by the invention has the advantages that the capital investments of reagents, instruments and the like at the initial stage of the experiment are reduced, the relative simple efficient purification steps are performed, the separation of the casein phosphopeptides is realized, the quantitative accuracy is guaranteed, the interference of impurities such as other proteins and lipids is effectively removed, the final detective sensitivity is improved, and the detection of a sample with low casein phosphopeptides content is beneficial.

A detection method for detecting HPLC-ESI-MS / MS of 19 species of quinolone drugs simultaneously belongs to the antibiotic drug analysis technology field. The detection method comprises three steps: sample treatment, liquid-phase separation and mass spectrometric detection, wherein the 19 species of quinolone antibiotics in a tissue fluid is subjected to positive ion MRM scan; norfloxacin-D5 is taken as the internal standard; C18 chromatographic columns are adopted for separation; water-methanol containing formic acid is taken as the mobile phase for gradient elution; and the eluent is subjected to mass spectrometric detection. The detection method is characterized in that the organic solvent extraction method is adopted for carrying out the sample pretreatment according to the practical situation of the sample and the different detection sensitivity requirements; norfloxacin-D5 is taken as the internal standard; the C18 chromatographic columns are adopted for separation; and the water-methanol containing formic acid is taken as the mobile phase for gradient elution. The pretreatment process of the method is rapid and convenient, the detection result is reliable and sensitive, and the method is suitable for the analysis and the detection of the quinolone drug residues in animal food.

The invention relates to the technical field of chemical composition test, and in particular relates to a method for detecting the residual amount of an L900 washing liquid in the cleaning process of plastic experimental apparatuses and glass wares of pharmacy, medical research, academics, biotechnology and other institutions. The method is used for carrying out quantitative analysis on residual amount of the L900 washing liquid in the plastic experimental apparatuses and the glass wares by combining an anion exchange column and reversed-phase high-performance liquid chromatography based on a methylene blue spectrophotometric method; octyl sodium sulfate and octyl sodium sulfonate in the washing liquid of the plastic experimental apparatuses and the glass wares are enriched and concentrated by simple and efficient steps, so that the detection sensitivity is improved; reversed-phase high-performance liquid chromatography is used for effectively separating out the octyl sodium sulfate and the octyl sodium sulfonate which are combined with methylene blue, so that the interference of other substances for detection can be eliminated, and the specificity of the method is effectively guaranteed. The method has the detection limit of 2ng / mL for the octyl sodium sulfate and the octyl sodium sulfonate, so that the accuracy of the detected data is effectively guaranteed, and the sample detection of the L900 washing liquid can be better carried out at the very low concentration.

The invention discloses a sensor for detecting the defects of the pipe bolt thread. The left end of the bolt's inner bushing is equipped with a magnetic coil. The middle section of it is covered by a proe bracket which can slide along the outside surface. The probe is fitted on the probe bracket by floating fitting and is distributed evenly and symmetrically along the circular direction. There is a probe guide groove in the middle of the inner bushing, allowing each probe to extend into the corresponding guide groove and can slide in its it by the driving of the probe bracket. the probe is equipped with magnetic induction element. The end of the inner bushing is equipped with a magnetic induction extension bushing. the flange guide groove is open in the middle of it and is in the induction extension bushing. Its arms are connected with the probe bracket with a extension arm. A linear electrical engine is connected with the axis of flange. By the detecting sensor, a variety of defects of the pipe bolt thread can be detected with a high accuracy and efficiency, so as to resolve a manufacture technical problem that exists all along in the oilfield and have a broad prospect.

The invention discloses an HPLC detection method of MES and NHS residues. A reversed-phase C18 silica bonded chromatographic column is used, a mobile phase consists of a phosphate buffer of pH 6.5 to 6.8, and an organic solvent, and the detection wavelength is 205 to 210nm; the organic solvent is methanol or acetonitrile. According to the method, samples do not need to be specially treated, the operation method is simple and easy to implement, the accuracy is high, the needs in actual detection can be met, and two substances MES and NHS can be detected to reach microgram scale.

The invention discloses a signal injection regulating device, which comprises: a signal detection unit connected to the connection between the signal injector and the power line, used to detect the current signal injected into the power line by the signal injector, and Feedback the detected current signal; the signal adjustment unit is used to receive the feedback current signal, determine the error between the feedback current signal and the pre-configured expected current signal, and adjust the current signal to be injected by the signal injector according to the error, The actual current signal that the signal injector injects into the power line is caused to match the expected current signal. The present invention detects the actual injected signal in real time, and adjusts the signal to be injected according to the error between the actual injected signal and the expected signal, so that the error between the fault detection result and the actual fault situation is reduced It is small, which effectively improves the detection accuracy and ensures the reliability of the detection results.