81 results about "Sample stability" patented technology

The invention relates to a processing method of sampling signals of a variable-frequency electric motor protection device. The line-in side of an electric motor, which is connected with a bus, is provided with a first CT (Computerized Tomography) group, a second CT group is mounted at the end of the electric motor, a third CT group is mounted at the neutral point of the electric motor, and the three CT groups are accessed in a variable-frequency electric motor protection device or the first CT group and the third CT group are accessed in a common protection device, and the second CT group and the third CT group are accessed in the variable-frequency electric motor protection device. In the variable-frequency operation of the electric motor, differential protection is formed by sampling currents of the second CT group and the third CT group. The variable-frequency electric motor protection device filters the acquired current signals by utilizing the orthogonality of an Fourier algorithm, eliminates the influence of the DC component and various higher harmonic components, adjusts sampling interruption time by adopting a real-time frequency tracking method, ensures the fixed number of sampling points in each cycle and then calculates the steady-state amplitude values of related analog quantities under variable frequencies. The invention improves sampling stability and accuracy.

The invention discloses a county-level crop planting area remote sensing statistic sampling survey scheme design method. Multi-period up-to-date GF-1 16-meter-width images are adopted as a data source; a decision tree classification method is constructed to perform automatic interpretation, so that the spatial distribution condition of crops in a research area can be obtained; with the spatial distribution data of the crops adopted as a sampling population, on the basis of the arable land area and crop planting scale of the research area, a PPS sampling method is adopted to select a general survey region; various sample unit sizes and various sample unit quantities are designed in the selected general survey region, the quadrat unit sizes, quadrat sample unit quantities, sampling methods and calculation methods are combined randomly, the calculation results of the statistic sampling survey schemes of different combinations are compared with the planting area of target crops which is obtained through the data interpretation of GF-2 0.8-meter-resolution images; and analysis is performed according to the overall sampling accuracy, sampling stability and minimum sample capacity of result data, and a remote sensing statistic sampling survey scheme most suitable for the target crops of the research area can be obtained.

The utility model relates to a sampler, in particular to a tube non-pump sampler, aiming at providing a tube non-pump sampler with compact size, simple and convenient operation, safety and reliability. The utility model adopts the technical proposal of comprising a sleeve, an diffusion tube, a copper net and an activate carbon; wherein, the copper net is lined internally inside the diffusion tube; the activated carbon is filled inside the copper net; the diffusion tube is closed at one end and an diffusion tube cover is arranged at the other end; the diffusion tube is sleeved inside the sleeve which is closed at one end; a locating convex ring is arranged at both ends of the diffusion tube; a locating convex ring cooperated with the locating convex ring of the diffusion tube is arranged at unclosed end of the sleeve; expansion holes are evenly arranged on the diffusion tube. The utility model has the advantages of meeting good result in sampling ratio, absorption capacity and sample stability and other performances and providing wide prospect for application fields such as environment monitoring, occupational health and sanitation and anti-epidemic station for giant potential in miniaturization, economization and portability.

The invention discloses a hyperspectral imaging based non-destructive quantitative testing device for mixture powder and a method. The hyperspectral imaging based non-destructive quantitative testing device comprises an excitation module, a scanning module, a signal acquisition module and a control drive module. Sample stability and system miniaturization during scanning detection are guaranteed by combining a two-dimensional galvanometer and a field sweeping lens, and the whole device is modular and high in integration level and resolution; incident light rays in different positions focus to the same plane during scanning, and high-resolution sharp images are acquired; the device has high degree of freedom, near-infrared and infrared hyperspectral imaging or fluorescence and Raman hyperspectral imaging can be realized by simply replacing a light source and switching between a dichroscope and a half-transparent and half-reflecting mirror; the testing method is particularly applicable to stable, non-destructive and accurate testing of a mixture powder sample.

The invention discloses a method for improving stability of output constant voltage of a primary side feedback flyback power supply under CCM on the basis of the current primary side feedback type flyback power supply CMM constant voltage control. The method of the invention combines with the digital feedback technology, provides voltage constant control with a digital approximation type mode detection strategy and a self-adaptive parameter regulation strategy, effectively distinguishes a DCM mode and a CCM mode through introducing the approximation type mode detection, and improves sampling stability under various modes. When a big load is changed, the method of the invention fully utilizes advantages of the stable state and constant voltage of the CCM through adaptively regulating reference voltage and PI parameters, corrects CCM sampling errors in a stepped manner and eliminates instability of constant voltage caused by CCM reference voltage hard regulation. The method for improving stability of output constant voltage of the primary side feedback flyback power supply under the CCM enables a PSR flyback power supply to satisfies that a voltage constant precision is + / -1% in a range of big power full load, realizes stable load regulation of a big CCM application and further expands universality of the primary side feedback type flyback type switching power supply.

The invention relates to a method for separating nano-particles at a water-phase density gradient centrifugation rate, which mainly comprises the following steps: 1) preparing the nano-particles into a homogeneous transparent colloid nano-particle solution by means of ultrasound, stirring and the like; 2) preparing density gradient solutions with different mass percentage concentrations respectively; 3) adding certain amount of density gradient medium solutions with different concentrations into a centrifuge tube in turn to prepare a step-like or linear density gradient solution; and 4) adding the solution containing colloid nano-particles to the liquid surface of the density gradient solution slowly, and performing centrifugalization under certain condition. Because the colloid nano-particles with different sizes have different sedimentation rates in the density gradient solution and can be detained at different positions in the density gradient solution so as to achieve the effect of separation. The method has the advantages of simple method, quick separation, low cost, small influence on the stability and the purity of a sample, and the separation effect of certain section can be enhanced selectively by adjusting and controlling centrifugal parameters.

The invention discloses a fluorescent pool for atmosphere Hox free radical real-time measurement. The fluorescent pool comprises a gas flow tube, a laser tube, and a fluorescence detection tube. A vacuum pump is used to extract the gas to be detected into the gas flow tube through a pinhole-shaped molecular beam splitter; an N2 shielding gas inlet is formed in the side of the gas inlet of the gas flow tube to ensure the sampling stability and low loss. 308 nm laser emitted and tuned by a laser is guided in the laser tube, and OH free radicals in the gas to be detected in the center of the fluorescent pool is excited to generate fluorescence; a plurality of diaphragms are mounted in the laser tube to reduce influence of laser stray light; a lens assembly and a reflector collect the excited fluorescent signals; the fluorescent signals pass through an optical filter and are detected through a photomultiplier; NO gas is introduced in the gas flow tube through an NO annular intake tube; the HO2 free radicals are converted to OH free radicals, and then the HO2 free radicals are compared and measured. The fluorescent pool can respectively measure the concentration of the OH free radicals and the HO2 free radicals, and can be applied to measurement and study of the concentration of HOx which is an important radical for the atmosphere oxidability.

The invention relates to an application of inductively coupled plasma mass spectrometry in drug testing of hemin. A method for measuring concentration of stable isotope iron in animal plasma is carried out by an ICP-MS (Inductively Coupled Plasma Mass Spectrometry) method and comprises the following steps of: providing an inductively coupled plasma source mass spectrometer; determining operating conditions of the ICP-MS; providing stable isotope iron powder, marked hemin, internal standard elements and the like; preparing standard solution and internal standard solution; preparing ICP-MS diluent; establishing a standard curve; measuring the stable isotope iron concentration in the plasma; and adding the ICP-MS diluent into a sample tube containing animal plasma sample containing iron, mixing uniformly and putting the sample tube into a refrigerator to be refrigerated, and determining the concentration of the iron in the plasma by the obtained standard curve. The application of the inductively coupled plasma mass spectrometry in the drug testing of the hemin has well performances, e.g., the method has well quantification lower limit, accuracy, absolute recovery test, sample stability, medium effect and quality control requirement, and can be taken as a content measurement method for analyzing the content of the stable isotope iron in a biological sample such as the plasma.

The present invention relates to the technical field of microorganism ability verification, and discloses a microorganism ability verification salmonella sample preparation method. According to the method, salmonella is adopted as target bacteria, and Serratia marcescens, Citrobacter freundii and Escherichia coli are adopted as interference bacteria; the method comprises: (A) strain resuscitation and amplification; (B) strain isolation; (C) bacterial suspension preparation; and (D) freeze-drying and packaging; and the prepared samples comprise a simple-level negative sample, a simple-level positive sample, an intermediate-level negative sample, an intermediate-level positive sample, a difficult-level negative sample and a difficult-level positive sample, wherein the sample having the same level are subjected to paired use. According to the present invention, the sample prepared through the method has the good stability, the strain survival rate is high, and the reasonable level standards with different difficulties are provided.

The invention belongs to the field of experiment box, and discloses a walk-in sample stability test box comprising a sealed box and auxiliary devices outside the box. The sealed box is a walk-in box. A temperature and humidity control system, a humidification air jet pipe, a high-power dehumidifier, a small-power dehumidifier, a cooling coil, an electric heating pipe, a temperature and humidity sensor, a set of processing wind uniform distribution system, a plurality of air-supply circulation fans, and the like are arranged in the sealed box. The functional parts are respectively connected with the temperature and humidity control system, and control the on / off and variable output during a process. An electrode humidifier and a water chiller unit are provided for the auxiliary devices outside the box. Through a PID regulator in the temperature and humidity control system, temperature and humidity can be accurately regulated. The invention aims at providing the walk-in sample stability test box with large volume, high temperature and humidity regulation precision, good temperature and humidity uniformity, and ultra-low energy consumption.

The invention discloses a method for preparing an antibacterial food packaging preservation film by doping garlic oil-beta cyclodextrin inclusion compound-clove oil. The method comprises the followingsteps: adding glycerinum, a bentonite-loaded citric acid preservation material, a clove oil-sodium alginate film liquid and a garlic oil-beta cyclodextrin inclusion compound and a chitosan film liquid into water; stirring the mixture at a high speed and dispersing the mixture fully; adding polyvinyl alcohol; putting the mixture in a water bath to be stirred at a high speed to be fully dissolved;stirring the mixture at a low speed; taking the mixture out of the water bath; ultrasonically exhausting air bubbles; cooling the mixture to a room temperature; pouring the mixture to an organic glasspanel; coating the mixture to form a film with a scraper blade; leaving the mixture to stand at a room temperature; and then drying the mixture in a vacuum drying box to prepare the preservation film. Based on the antibacterial action of garlic oil, by means of the beta-cyclodextrin inclusion technology, the garlic oil-beta cyclodextrin inclusion compound is prepared. The garlic oil-beta cyclodextrin inclusion compound is free of irritant smells and shows good thermal stability, light stability and long-term reserved sample stability. The follow-up film forming demand is met fully and a goodmicrobial separating and inhibiting effect is shown.

The invention discloses a detection method and apparatus for the stability of a liquid sample. The method comprises the following steps: scanning and detecting the light intensity value of a near-infrared source incident into the liquid sample by using a photodetector, wherein the volume of the liquid sample is at least 2 ml, the height of the liquid sample scanned and detected by the photodetector is h, the total height of the liquid sample is H, and h is not more than H; and calculating the value of a liquid sample stability index TSI according to a ratio of the sum of the change values of the light intensity of two adjacent scanning operations to the total height H of the liquid sample within scanning frequency n in preset time. According to the invention, a histogram is established on the basis of the TSI distribution probability of a great number of samples detected a plurality of times and the TSI value, and the TSI value distribution state of the great number of liquid samples is directly calculated; meanwhile, a visual and clear radar map is established for the values of the liquid sample stability index TSI at different time points to evaluate the stability of the liquid sample.

The invention provides an initialization phase alignment method of a high-speed source synchronous LVDS interface, and relates to the technical field of high-speed data transmission. The method comprises the following steps: judging the stability of sampled parallel data, and finding a first transition area; judging the stability of the parallel data, judging whether a cyclic shift result of a training word penetrates through the first transition area in case of sampling stability; and performing a shift operation on the parallel data until the training word is obtained, and gradually increasing the delay, judging the correctness of the parallel data, and finding a second transition area; and adjusting the delay of a data channel to a half of fan affective window length. In view of the problem that the possible fixed jitter in the transition areas is not considered in the traditional initialization phase alignment method, whether the sampling data are matched with the training word, namely the correctness, is judged in the process of penetrating through the first transition area and finding the second transition area, so the correctness of identifying left and right side edges of an effective window of a data eye pattern is improved, and thus the high reliability of the initialization phase alignment of the high-speed source synchronous LVDS interface is ensured.

The invention discloses a preparation method of spherical fluorescent powder. In the preparation method, by a hydrothermal method in which ethanol / isopropanol is used as a mixed solvent, under the action of a surfactant dodecyltrimethylammonium bromide, and by using ammonium molybdate, calcium nitrate and europium oxide as raw materials, highly-dispersed uniform spherical CaMoO4:Eu3<+> red fluorescent powder particles are prepared. Through regulation and control of alcohol ratio and reaction conditions, morphologies of the particles are controlled. The preparation method is simple in operation; the spherical fluorescent powder prepared by the preparation method has the characteristics of high sample stability, good luminescent monochromaticity and a uniform spherical morphology; the defects that by the conventional method, the particle size is hard to control, agglomeration is easy and particle distribution is non-uniform are overcome; the preparation method has a certain promotional value and a certain practical application value. The spherical fluorescent powder can be effectively excitated by 250-310 nm and 380-400 nm ultraviolet light, and can be used as red fluorescent powder of a UV-LED and the like.

The invention discloses an antiviral drug which can be taken orally or molten - a ribavirin tablet and a manufacturing method thereof. The compositions of the preparation by weight percent are 3.8 to 20 percent of ribavirin, 71 to 83.25 percent of sugar and 9 to 12.95 percent of other pharmaceutic adjuvant. The manufacturing method comprises the following steps: 80 meshes of the ribavirin, 80 meshes of the sugar and other filler and disintegrating agent between 80 meshes and 100 meshes are taken and mixed; an adequate bonding agent is added into the mixture and particles are prepared, boiled, dried and integrated and added with lubricant; after uniform mixture, the weight of a stator plate is tested, and tabletting is performed; and after test qualification, packaging and full inspection are performed. The preparation lightens the passivity of patients in taking medicine and particularly solves the problem of medicine taking of infants, old patients, dental patients, upper respiratory tract virus infection patients and so on; and as shown by production for a plurality of years and sampling stability study, the quality of the preparation is stable.

The invention discloses a method for inspecting the quality of a haemorrhoids suppository. The method comprises steps of identifying and measuring the content, wherein the step of identifying comprises a step of identifying a thin-layer chromatography of Chinese galls in the haemorrhoids suppository, wherein a Chinese gall reference medicine material and a nutgall acid reference substance are taken as reference materials, and trichloromethane-ethyl formate-formic acid is taken as a developing solvent; the step of measuring the content comprises a step of detecting berberine in the haemorrhoids suppository, namely, measuring by adopting a high-performance liquid chromatography method taking a berberine reference substance as a reference material and a solution prepared from a acetonitrile-0.1% phosphoric acid solution (every 100ml of the solution contains 0.1g of sodium dodecyl sulfate) as a mobile phase. The method has the advantages of sensitivity, stability, reliability and the like, the defect that the thin-layer identification negative chromatography of scutellaria baicalensis can cause interference is effectively eliminated, a system is high in suitability, linear relation, precision degree, sample stability and repeatability and sample feeding recycling rate, and the quality of a medicine can be accurately reflected, so that the quality of the medicine can be effectively controlled.

The invention discloses a preparation method of clotrimazole vaginal tablets, and belongs to the field of pharmaceutical preparations. The method comprises the following steps: 1, preparation of an adhesive solution by wet granulation; 2, preparation of a granule coating liquid; 3, preparation and coating of lactic acid and calcium lactate granules; 4, total mixing of materials; and 5, tableting and packaging. The method separately granulates lactic acid, calcium lactate and starch, and coats granules, and can effectively isolate the direct contact between raw materials and acidic components and prevent the migration of the acidic components during the tablet placing process, thereby effectively avoiding the curative effect reduction caused by the degradation of active components, and theprepared sample has good stability. The preparation process of the invention uses common equipment, can realize industrial production, and is worthy of application and promotion.

The invention provides a standard sample of red sea bream iridobirus virus molecules and a preparation method for the standard sample. The preparation method specifically comprises the steps: selection of raw materials of RSIV (red sea bream iridobirus virus), preparation of the standard sample, checking of uniformity and stability, qualitative verification, value fixing and the like. The preparation method for the standard sample comprises the steps: extracting a DNA (deoxyribonucleic acid) of a virus from an RSIV solution, performing PCR (polymerase chain reaction) to multiply and purify a target gene fragment, connecting and converting the target fragment, and recycling plasmids. The standard sample of red sea bream iridobirus viruses is high in stability and high in uniformity, supplies requirements of the standard sample on detection researches, medicinal researches and application researches on the red sea bream iridobirus viruses, technically instructs a inspection and quarantine institution and technically supports service export enterprises. According to the standard sample disclosed by the invention, comparison of different laboratory results can be realized, so that the quality control in a laboratory is guaranteed.

The invention provides an overlying deposit sampler. The sampler comprises extending-and-contracting buttons, an extending-and-contracting rod, a first clamping block, a second clamping block, a sampler horizontal extension section, a sampling box and a vertical support rod, wherein the extending-and-contracting rod can extend and contract a sampler and can be disassembled at any time and in any place; the extending-and-contracting rod is fixed through the first clamping block and the second clamping block before and after sampling closing; the sampler horizontal extension section facilitates lifting and pulling operation; the sampling box is used for collecting collected bottom mud samples and reducing interference of the sampler with the bottom mud samples; the vertical support rod controls a steel plate to be opened and closed through the effect of the first clamping block, the second clamping block and a spring, and the sampler is closed through the steel plate after sampling is completed, so that it is guaranteed that the sampling box in the sampler is located in a closed space, and disturbance and mixing of the deposit samples are reduced; through sawteeth on the sampler, sampling difficulty is greatly lowered, so that the sampler can be adapted to more sampling environments. The overlying deposit sampler has the advantages of being easy to operate, low in cost, convenient to disassemble and carry, great in disturbance resistance, high in sampling stability and capable of controlling the sampling depth flexibly.

The invention provides a portable detection device and a portable detection method based on a neuromuscular electric stimulation device. The portable detection device comprises a housing, a circuit board, a software system, and a touch screen. The housing comprises a main housing body, key caps, and installation fixing members. The circuit board comprises a relay network, a resistor network, a signal conditioning circuit, a CPU single-chip microcomputer, and a power supply module. By adopting the automatic control, the safety protection, and the circuit conversion of the relay network, the switching of the load resistors having different resistance values of the resistor network, the amplification of the signals of the signal conditioning circuit, and by additionally providing a signal zero point circuit, sampling precision and sampling stability are improved, precision of detected electric parameters and waveforms is higher, and linear errors are reduced. The portable detection device has a simple structure, and is widely used in a medical device detection field and an industrial control field.

The invention discloses a preparation method for a standard sample of an infectious hematopoietic organ necrosis virus molecule. The preparation method is characterized by including following steps: extracting an infectious hematopoietic organ necrosis virus RNA (ribonucleic acid); performing RT-PCR (reverse transcription-polymerase chain reaction); purifying target genes; performing connection transformation of target segments; recycling plasmid; performing in vitro transcription; performing RNA purification after transcription; and performing phenol chloroform extraction. The preparation method is time-saving and labor-saving in a preparation process, the standard sample of prepared infectious hematopoietic organ necrosis virus ribonucleic acid is high in stability and fine in uniformity, standard samples can be provided for infectious hematopoietic organ necrosis virus detection researches, medicine researches, application researches and the like, so that comparison of different laboratory results is realized, and quality control of laboratories is guaranteed.

The invention discloses an atosiban purification and separation method. The method includes steps: dissolving a crude product of atosiban in acetonitrile water solution, and filtering through a filter membrane to obtain crude solution for standby application; adopting a mobile phase A which is sodium dihydrogen phosphate or monopotassium phosphate aqueous solution for balancing a reversed phase column; loading the crude solution into the reversed phase column; adopting the mobile phase A and a mobile phase B which is acetonitrile for gradient eluting, and collecting eluting peaks; subjecting collected target peptide solution with purity higher than 99.7% to vacuum rotary evaporation and concentration at a temperature not higher than 35 DEG C; converting concentrated liquid into peptide solution of acetate; subjecting the peptide solution of acetate to vacuum rotary evaporation and concentration at a temperature not higher than 35 DEG C, and performing freeze drying to obtain a finished product of atosiban. The atosiban purification and separation method has advantages that toxic impurities including Asp5-atosiban and Gly9-OH-atosiban in atosiban can be separated completely, medicine safety is improved while product yield is increased, and acquired samples are high in stability and applicable to industrial production.

The invention utilizes a layer-by-layer secondary growth method for enabling a molecular sieve to be assembled to diatomite. A special template agent containing CTAB enables mesopores to be produced inside crystals of the surface of the molecular sieve in a molecular sieve assembling and growing process, mass diffusion and limiting influence in an adsorption process are reduced, and adsorption advantages of micropores are maintained. The obtained product has a skeleton structure and macropores of diatomite, micropores of the molecular sieve and introduced mesopores, strong adsorption capability, rapid hole diffusion process and good surface hydrophobic property, and pore diameter ratio and type of the molecular sieve can be adjusted according to different pollutants. The preparation method provided by the invention is simple in process and operation, a preparation period is short, requirement on instrument is low, sample stability is high, and the prepared composite has a broad application prospect in the field of water pollutant treatment.

The invention discloses a kit for detecting the drug concentration of nilotinib in dried blood spots. The kit comprises an internal standard extraction reagent, and dried blood spot calibrators, wherein the internal standard extraction reagent adopts isotopically substituted nilotinib as an internal standard substance, and a solvent for the internal standard extraction reagent is a mixture of an organic solvent and water; the nilotinib dried blood spot calibrators are a group of nilotinib dried blood spot samples with different concentration gradients, the number of the dried blood spot samples is equal to or larger than 6, and the dried blood spot samples are fixed on a dried blood spot collection card; and the concentration range of the concentration gradients is between 50 ng / mL and 4,000 ng / mL. The invention further discloses a detection method implemented by the kit. The kit and the detection method provided by the invention have the advantages of small sampling volume, high sample stability, and high accuracy of detection results.

The invention discloses a coenzyme Q10 capsule and a preparation method thereof. The coenzyme Q10 capsule is characterized by being prepared from coenzyme Q10 crude drugs and pharmaceutically acceptable excipients; coenzyme Q10 is uniformly mixed with the excipients, and then wet granulation and whole grain filling are adopted to obtain the coenzyme Q10 capsule. According to the preparation methoddisclosed by the invention, proper excipients are selected, and sldium lauryl sulfate is added into an adhesive and is used as a lubricating agent, so that the stability of a medicine is improved, and the disintegration speed of the medicine is also increased. The prepared granules are uniform and good in mobility; the disintegration, content uniformity and related substances of the capsule all meet the requirements; in addition, the stability of the capsule is better than that of an imported preparation. The method disclosed by the invention has the advantages of simplicity, low cost of theexcipients, good sample stability and suitability for industrial mass production.

A pumpless sampler mainly comprises a polytetrafluoro plastic housing, aluminium covers, a polytetrafluoro hydrophobic filter membrane, fibrous circular active carbon plates, polyurethane foam and a collar clamp. The specific composition is as follows: the two carbon plates are parallel to the cross section of a polytetrafluoroethylene plastic tubing and arranged at two ends and are isolated and fixed through the polyurethane foam between the carbon plates; and the two tubing ends are covered with the polytetrafluoro hydrophobic filter membrane, which is fixed and clamped with the aluminium cover. The sampler has the following advantages: the bidirectional transparent housing structure is beneficial to enhance the sampling efficiency and can achieve a satisfying effect in the aspects of adsorption flux and sample stability, and an adsorbent based on active carbon can effectively monitor most harmful gases in the environment. The sampler has very huge potential in the aspects of miniaturization and portability, has a wide application prospect in many fields such as occupational health, environment monitoring and the like, and especially is of great significance for personal sampling in the field of occupational health.

The invention discloses a nonlinear transmittance testing device. The device comprises a light source module used for providing an excitation light beam, a light intensity attenuation module used forattenuating the excitation light beam to preset power, a focusing lens used for focusing the attenuated light beam to the position of a sample, and a detector used for measuring related nonlinear optical properties of transmitted light passing through the sample. According to the device, the design of the light intensity attenuation module is adopted, so that while the space distribution uniformity of the incident light intensity is guaranteed, the incident light intensity can be adjusted in a nearly continuous mode; the intensity is adjusted to the required intensity, so that the error causedby manual repeated measurement of the excitation light intensity in a traditional testing method is avoided; and only by performing one-time calibration on the light intensity attenuation module, themeasurement of the related nonlinear optical properties of the light intensity can be rapidly realized, so that the measurement time is greatly shortened, and the requirements on the stability of thesample are lowered.

The invention discloses a method for determining squalene content of pandanus amaryllifolius Roxb. volatile compositions. HPLC is employed for determination. The mobile phase is methanol, the flow velocity is 0.8-1.2 mL / min, the detection wavelength is 204 nm, the column temperature is 25-35 DEG C, the detection time is 30 min, and the sample size is 10 mu L. By using the method for determining squalene content from pandanus amaryllifolius Roxb. volatile compositions, the sample size and the peak area integral value show a good linear relation, the sample stability, the instrument precision, the method reappearance and the method specificity all accord with requirements, and a basis is established for rapid and accurate quantification of squalene.

The invention relates to an analysis technology of pharmaceutical intermediates, in particular to a method for analyzing the purity of N-p-aminobenzoyl-L-glutamic acid through chromatography. No method for analyzing the purity of an N-p-aminobenzoyl-L-glutamic acid sample exits in the prior art so that the purity and the quality of the N-p-aminobenzoyl-L-glutamic acid sample can not be analyzed and monitored, thus the quality of a folic acid synthesized by using the N-p-aminobenzoyl-L-glutamic acid as a raw material can not be ensured, and medical effect can not be ensured. In the method of the invention, the purity of the N-p-aminobenzoyl-L-glutamic acid sample is analyzed with an internal standard curve method by adopting a common C18 column matching with an ultraviolet detector, taking an H3PO4-KH2PO4 buffer solution-methanol system as a mobile phase and adopting a sulfanilic acid as an internal standard substance, wherein the flow velocity of the mobile phase is set as 0.3 milliliter / minute. The method has the advantages of easily realized analysis conditions, high stability of the sample, good repeatability of an analysis result and high accuracy of the analysis result.

The invention provides a method for identifying HPCE fingerprints for protecting ginseng of origin, which is characterized by comprising the following steps: A, establishing fingerprints of the ginseng of origin, namely using the ginseng in the same habitat as a standard, analyzing the ginseng by capillary cataphoresis and establishing fingerprints of the cataphoresis; and B, detecting a sample, namely taking a ginseng sample to be detected, detecting the sample under the same conditions as the standard respectively to obtain a spectrogram of the detected sample, and analyzing the fingerprints of the detected sample and the standard by a direct observational method or fingerprints software as qualitative basis. The method has the advantages of simple processes, short period and low consumption; chemical information of the fingerprints of the ginseng medicinal material is comparatively rich; and the obtained characteristic peak can easily identify habitat and category of the ginseng, so as to provide reference for quality control of the origin ginseng medicinal material. The research of methodology shows that instrument precision and sample stability and repeatability of the method have better application prospect, so the method is suitable for popularization in the technical field of drug safety check.