31 results about "Sample stability" patented technology

The application discloses a hydrate sediment sample preparation device and method at different stratum depths, and a sample stability-maintaining transfer method. The device comprises a sample preparation kettle placed in a constant-temperature water bath box, an axial pressure loading assembly connected with the sample preparation kettle and used for applying axial pressure load to the sediment sample, and a pore pressure generating assembly connected with a cavity in the sample preparation kettle. The preparation process comprises the following steps: preparing the sediment in the sample container; transferring the sediment sample to a centrifuge; adding axial pressure consolidation; injecting high-pressure methane gas; preparing the sample under supergravity; stopping the centrifuge and moving to liquid nitrogen; sampling under normal gravity while maintaining stability; and transferring the sample while maintaining stability. The application can simulate the preparation of hydrate-containing sediment samples under effective stress levels at different stratum depths in a laboratory supergravity environment, and can transfer the samples to a scanning electron microscope or other microscopic observation device for testing while maintaining the stability of the hydrates.

The present disclosure provides icIEF sample matrices that enable icIEF analysis of PEGylated proteins in their real conjugated states. The sample matrices of the present disclosure can include glycine, which enables the separation of co-migrated PEGylated protein charge variants. The sample matrices can also include taurine, which further improves icIEF assay by depleting matrix induced baseline interferences. Accordingly, a sample matrix of the present disclosure including a combination of glycine and taurine enables icIEF separation of acidic and basic species from the main peak for PEGylated proteins, allowing the identification / separation, characterization and quantification of discrete PEGylated protein species. By using the sample matrices of the present disclosure to characterize PEGylated proteins by icIEF, repeatability, linearity, accuracy, sample stability, and method robustness are achieved.

The invention discloses a hot stamping film coating adhesive force testing device which comprises a testing table, a transverse sliding table module is arranged at one end of the upper portion of the testing table in the horizontal direction, and a height sliding table module is arranged at the position, close to one end of the transverse sliding table module, of the testing table in the vertical direction. The transverse sliding table module is slidably provided with a sample table for placing a sample, the height sliding table module is slidably provided with a sensor assembly for fixing a to-be-tested film layer on the sample, a chip processor is arranged in the test board, and the transverse sliding table module, the height sliding table module and the sensor assembly are electrically connected with the chip processor. By specially designing the sample table for fixing the hot stamping film sample, the stability of the sample is remarkably enhanced during testing, the measurement error is effectively reduced, flexible adjustment within the range of 90-180 degrees can be realized according to material characteristics and use requirements, the test condition is ensured to be consistent with the actual application environment, and the test efficiency is improved. And the accuracy and practicability of the test result are further improved.

The invention relates to the technical field of sample preparation, and discloses a sample preparation method for microscopic characterization of a sample profile. The method comprises the steps of sample pretreatment, specific position positioning, profile preparation, sample separation, carrier transfer and fixation and the like, cutting parameters are accurately controlled through a focused ion beam (FIB), and a silicon wafer carrier and Pt / C / W welding and fixing technology is combined. The problems that in an existing sample preparation method, sample preparation precision is low, conductivity is poor, fixation is unstable, and multi-characterization combination adaptability is insufficient are solved. Nondestructive preparation of a small-size micro-area profile at a specific position is realized, the sample stability is high, various characterization means such as nano infrared and nano SIMS are compatible, the accuracy and relevance of analysis data are ensured, and the method is suitable for microscopic characterization requirements in the fields of semiconductor integrated circuits, nano coatings, biomedical materials and the like.

The invention belongs to the technical field of ultra-deep and ultra-high pressure ground sample transfer, and relates to an ultra-deep and ultra-high pressure condensate gas well sampling and transferring device and a use method thereof. Comprising a sampler, the sampler is used for completing sampling from the ultra-deep ultrahigh pressure condensate gas well, and a sample transferring container is used for transferring a sample. The sample transfer container is filled with alcohol substances, and when a sample is transferred into the sample transfer container, the alcohol substances are synchronously discharged to the liquid collection container, so that the stability of the pressure in the sample transfer container is ensured, and the stability of the sample in the sample transfer process is ensured. A switch unit is arranged on the communicating pipeline and is used for controlling communication and disconnection between the sampler and the sample transfer container. And the first pressure measuring and regulating part is used for regulating the pressure in the sampler, so that stable sample transfer of the sample is facilitated. And the second pressure measuring and regulating part is used for regulating the pressure in the sample transferring container to ensure the stability of the sample transferring process. According to the invention, the sample transfer in the ultra-deep ultrahigh pressure condensate gas well sampler can be realized, and the sample transfer process is safe and reliable.

The invention provides a Raman characterization method based on targeted modification of SHINERS and co-pool synchronous monitoring of heterogeneous Fenton-like reaction, and belongs to the technical field of cross of spectral analysis and environmental catalysis. Aiming at the defects of poor sample preparation stability, large measurement system error and only qualitative data analysis in the prior art, through innovative fusion of a targeted stable sample preparation technology and a dual-electrode common-pool synchronous monitoring system, a time-resolved in-situ Raman spectrum and a targeted modified shell layer isolated nanoparticle enhanced Raman spectrum are combined for use; dynamic in-situ characterization of transient intermediates, active species and reaction paths on the surface of the catalyst in a heterogeneous Fenton-like reaction system is realized. The method can adapt to various catalysts and oxidants, qualitative characterization and process detection of heterogeneous reaction are achieved, breakthrough technical support is provided for analysis of a Fenton-like reaction mechanism, and the problems that a traditional sample preparation and measurement method is poor in universality and insufficient in uniqueness are solved.

The invention relates to a sample treatment liquid for respiratory virus antigen detection and a preparation method thereof. The sample treatment liquid comprises a phosphate buffer solution, 0.05-0.5 g / L of sodium caseinate, 1-20 g / L of bovine serum albumin, 10-50 mL / L of a surfactant, 1-10 g / L of guanidine hydrochloride, 3.72-37.2 g / L of an ethylene diamine tetraacetic acid disodium salt diaqueous solution, 1-5 mL / L of a CL preservative, 1-5 mL / L of a BND bacteriostatic agent and 900-988 mL / L of sterile deionized water. The method has the advantage of good sample stability.

The invention discloses a preparation method of a drift correction sample for X fluorescence analysis of a free acid-containing product in copper smelting, and belongs to the technical field of drift correction of an X fluorescence analyzer. The method comprises the following steps: (1) selecting a free acid-containing product generated in a copper smelting process, and adding the free acid-containing product into high-purity water to prepare slurry; (2) adding a saturated solution of alkali metal hydroxide or alkaline earth metal hydroxide into the slurry until the pH value is 6.8-7.2 to obtain a liquid mixture; (3) filtering the liquid mixture to obtain a solid substance; (4) drying, crushing and uniformly mixing the solid substance to obtain uniform powder; and (5) pressing the uniform powder into a circular sheet to obtain the drift correction sample. According to the method, the free acid is neutralized, so that the negative effects of corrosion of the free acid on the X fluorescence analyzer, aggravation of fracture damage, chemical component change and the like of the drift correction sample are avoided, and the drift correction accuracy and the drift correction sample stability are improved.

The utility model provides a coal detection sample transportation device, relates to the technical field of coal detection, and solves the technical problems that a coal detection sample transfer trolley is single in function and cannot shake up samples in the transfer process. The coal detection sample transporting device comprises a vehicle body, a driving device located on the vehicle body, a rotating shaft, a rotating arm and a tank, the driving device is fixed to the vehicle body, the driving device is in driving connection with the rotating shaft and used for driving the rotating shaft to rotate with the axis of the rotating shaft as the axis, the rotating shaft is hinged to the rotating arm, and the rotating arm is rotationally connected with the side wall of the tank; a containing plate is fixed in the tank body and used for fixing a sample bottle, and the tank body can be driven by the rotating arm to swing so as to shake the sample bottle; the driving device drives the rotating shaft to rotate to realize rotation of the rotating arm, so that the tank body swings to automatically shake up the sample bottle, the problems of low manual shaking-up efficiency and poor sample uniformity are solved, and the device has the advantages of improving the detection efficiency and the sample stability.

The invention provides a method for measuring the content of active ingredients in gardenia-rhubarb decoction. The method comprises the following operation steps: 1) preparing a reference solution; (2) preparing a test solution; and (3) detecting by adopting an HPLC (High Performance Liquid According to the method for determining the content of the active ingredients in the gardenia-rhubarb decoction, the reference sample of the rhubarb decoction is obtained on the basis of the original record of Jingui Litu and is used for constructing the method for detecting the active ingredients in the gardenia-rhubarb decoction; according to the method, high-resolution detection of seven key functional components including genipin gentiobioside, geniposide, narirutin, hesperidin, daidzein, emoditin-7-O-beta-D-glucoside and genistein is realized, the specificity is high, the repeatability is good, a reliable technical support is provided for quality standard improvement and clinical precise medication of the gardenia-rhubarb decoction, and the method has a wide application prospect. The method has important significance on guaranteeing the stability of the gardenia-rhubarb decoction reference sample.

This invention relates to the field of internal quality control technology for nucleic acid testing, and discloses a method for preparing an internal quality control sample for viral nucleic acid testing for blood screening. The method includes: mixing HCV RNA-positive plasma; mixing the HCV RNA-positive plasma with HCV RNA-negative plasma or newborn calf serum to obtain a first plasma mixture; mixing the plasma mixture with methylene blue solution to obtain a second plasma mixture; and irradiating the second plasma mixture with light. The method for preparing an internal quality control sample for viral nucleic acid testing for blood screening provided by this invention yields a sample with good stability and low cost.

The utility model application relates to the field of biological experiment equipment discloses a kind of living cell tissue perfusion collection systems.The system includes: liquid flow switching dosing module, constant temperature incubation module, sample automatic collection module and sample low-temperature maintenance module.Liquid flow switching dosing module switches different liquid according to experimental requirement anytime, average shunt pumps into constant temperature incubation module;Constant temperature incubation module provides closed, constant temperature incubation liquid flow environment for living cell tissue perfusion experiment;Sample automatic collection module receives the perfusion liquid sample flowing through constant temperature incubation module, and according to the specified time sequence, sample is collected into collection well plate;Sample low-temperature maintenance module keeps sample collection plate in relatively low temperature state by refrigeration temperature control mode, to delay sample volatilization and the denaturation of the substance to be tested in it, guarantee sample stability.Through the system, perfusion liquid sample can be accurately collected according to time sequence, improve experimental result accuracy, to obtain repeatable high-quality experimental result.

The invention provides an outer vesicle surface protein in-situ labeling method, and belongs to the technical field of outer vesicles, and the outer vesicle surface protein in-situ labeling method provided by the invention comprises the following steps: carrying out differential centrifugal separation on outer vesicles, carrying out quality evaluation by adopting nano-particle tracking analysis, and establishing a positive and negative correlation coupling equation set to optimize labeling conditions. The method comprises the following steps: fixing a sample by using glutaraldehyde, labeling antibodies in an optimized labeling buffer solution, removing free antibodies through ultrafiltration centrifugation, carrying out singular value decomposition calculation, adding a special protective agent, analyzing morphological characteristics by adopting a deep learning model, and ensuring the stability of the sample through filter membrane filtration and low-temperature preservation. In the whole process, a complete quality control system is established, the labeling targets of high specificity, high efficiency and high stability are achieved, and the technical problems of low labeling specificity and poor stability in the in-situ labeling process of the outer vesicle surface protein in the prior art are solved.

The invention relates to the technical field of production of grid samples for electron microscopes, and discloses a grid sample production device for electron microscopes, which comprises a main body assembly and a frame body, a first air cylinder is fixed on the frame body, a tweezers adapter is fixed at the output end of the first air cylinder, and tweezers are arranged below the tweezers adapter. Grids are clamped by the tweezers, and the tweezers adapter is connected with the tweezers through a connecting piece. And the freezing assembly is arranged in the frame body and comprises a freezing piece. The device has the beneficial effects that the connecting piece cooperates with multiple springs through a limiting block and a swing rod, quick disassembly and assembly of tweezers and an adapter are achieved, the direction of the tweezers can be positioned, grid angle deviation is avoided, the operation efficiency and the sample stability are improved, a moving piece, a limiting piece and a screening piece in the freezing assembly are linked, an empty storage barrel is automatically searched, freezing grids are stored in a sealed mode, and the freezing efficiency is improved. A low-temperature environment is guaranteed and storage efficiency and sample quality are improved.

The embodiment of the invention discloses a seawater pH quality control sample and a preparation method thereof, and belongs to the technical field of analysis and detection. The method comprises the following steps: dissolving a buffer reagent in simulated seawater, and adjusting the pH value to a target value by using hydrochloric acid or sodium hydroxide to prepare a seawater pH quality control sample with the pH range of 2-10. The quality control sample with the pH range of 2-10 can be obtained, the wide range from strong acidity to weak alkalinity is covered, the pH measurement requirements of seawater samples in different sea areas and different depths are met, the pH quality control sample is good in stability, the validity period is as long as 2 years, the pH quality control sample can be widely applied to the fields of marine scientific research, environmental monitoring, water quality analysis and the like, and the application prospect is wide. And reliable technical support is provided for accurate measurement and quality control of the pH value of seawater.

This application discloses an excitation device belonging to the field of oil detection technology. The excitation device is configured with a sample feeding unit, a sample delivery unit, a rotation unit, and a sampling unit. The second driving component in the sample delivery unit ensures high accuracy in positioning of the rod electrode and can stably generate an electric arc with the disk electrode. The third driving component in the sampling unit ensures that the disk electrode can be stably immersed in the sample oil, guaranteeing sampling stability. After one sampling excitation is completed, the first driving component in the sample delivery unit maintains the distance between the rod electrode and the disk electrode at a preset distance, eliminating the need to replace the rod electrode or manually adjust the distance between them. Driven by the first driving component, the next sampling excitation can be performed quickly, improving excitation efficiency and thus enhancing the detection efficiency of the arc direct-reading atomic oil spectrometer. Moreover, the entire process requires no manual operation, has a high degree of automation, and ensures safety during use.

The invention discloses a high performance liquid chromatography detection method for naphthalene in medium / long-chain fat emulsion injection (C8-24Ve). According to the method, the naphthalene in the medium / long-chain fat emulsion injection (C8-24Ve) can be detected in a short time by utilizing a high performance liquid chromatograph. The method is simple, convenient to operate, efficient and rapid, the most common chromatographic column and detector are adopted, naphthalene detection in the medium / long-chain fat emulsion injection (C8-24Ve) is achieved within 35 min, the selected mobile phase cannot damage an instrument, the detection time is short, and the method is an efficient and reasonable analysis method. The sample stability is good, the product quality is ensured, the production and daily detection of enterprises are facilitated, the efficiency is improved, and the detection cost is greatly reduced.

The application relates to a sample processing liquid for respiratory virus antigen detection and a preparation method thereof, which comprises a phosphate buffer, 0.05-0.5 g / L sodium caseinate, 1-20 g / L bovine serum albumin, 10-50 mL / L surfactant, 1-10 g / L guanidine hydrochloride, 3.72-37.2 g / L ethylenediaminetetraacetic acid disodium salt dihydrate solution, 1-5 mL / L CL preservative, 1-5 mL / L BND bacteriostatic agent and 900-988 mL / L sterile deionized water; and the application has the advantages of good sample stability.

The invention relates to the technical field of traditional Chinese medicine analysis, in particular to a construction method of a Yuquan capsule characteristic spectrum. Comprising the following steps: 1, preparing a reference substance solution; 2, preparing a test solution; 3, determining conditions; and 4, generating a contrast characteristic spectrum. According to the invention, methodological investigation is carried out on the constructed Yuquan capsule characteristic spectrum method, and the methodological investigation comprises an instrument precision experiment, a method repeatability experiment and a sample stability experiment. In each experiment result, the RSD value of the relative retention time of each peak is less than or equal to 1.0%, and the RSD value of the relative peak area is less than or equal to 10.0%. By means of the method, large types of chemical components in the Yuquan capsules can be reflected, and the overall quality of the Yuquan capsules can be controlled more efficiently and rapidly.

The invention relates to a method for determining eight components, namely gastrodin, chlorogenic acid, genipin gentiobioside, geniposide, albiflorin, paeoniflorin, 2, 3, 4, 5-tetrahydroxy stilbene-2-O-B-D-glucoside and baicalin, in a paeonia lactiflora and ephedra spasm relieving granule extract. The methodology verifies that the precision, repeatability, sample stability and sample recovery rate of the method disclosed by the invention are good, the result meets the content determination requirements, and the method can be used for effectively determining the content of gastrodin, chlorogenic acid, genipin gentiobioside, geniposide, albiflorin, paeoniflorin, 2, 3, 4, 5, 6-tetramethyl-7-oxo-7-oxo-7-oxo-7-oxo-7-oxo-7-oxo-7-oxo-7-oxo-7-oxo-7- The composition is prepared from eight components including 1, 2, 3, 4, 5-tetrahydroxy stilbene-2-O-B-D-glucoside and baicalin.

The utility model relates to the technical field of food detection, and discloses a sample preservation device, which comprises a preservation box and a sample tube, the inner part of the preservation box is fixedly connected with a limiting column I, the outer wall of the limiting column I is connected with a limiting round block in a sliding manner, and the outer wall of the limiting round block is rotatably connected with a sample disc; a sample groove is formed in the top end of the sample disc, the outer wall of the sample tube is slidably connected to the inner wall of the sample groove, a through groove is formed in the outer wall of the storage box, and a fixing shell is fixedly connected to the outer wall of the storage box. According to the sample taking device, the sample disc, the sample tubes, the fixed column, the gear, the rack I, the connecting block, the rack II and the reset assembly are matched with one another, so that the sample tubes can be taken out one by one in a sample taking process, and all the sample tubes do not need to be exposed outside, so that the interference of environmental change on undetected samples can be reduced to the greatest extent; the stability of the sample can be maintained, and meanwhile, the orderly detection of the sample can be facilitated.

The application provides a capability verification liquid sample stability test method and related equipment, and relates to the technical field of radionuclide analysis.The method comprises the following steps: randomly drawing a preset number of to-be-processed liquid samples from a liquid sample, determining a stability test parameter, placing the to-be-processed liquid samples into corresponding test environments for processing, obtaining to-be-tested liquid samples, and the stability test parameter at least comprising a temperature.An analysis is performed according to a standard analysis method to obtain a measurement average value of a radionuclide, the measurement average value is corrected to a preset test date according to a half-life of the radionuclide to obtain a corrected average value, and a stability conclusion of the liquid sample under the stability test parameter is obtained according to the corrected average value.The method can test factors affecting the stability of the capability verification liquid sample, avoid the influence of these factors during the analysis of the activity concentration of the radionuclide, and improve the reliability of the analysis result of the activity concentration of the radionuclide.

The utility model belongs to the technical field of cashmere detection, particularly relates to a cashmere fineness detection device, and provides the following scheme aiming at the problems that an existing device cannot carry out accurate detection well and cannot keep the stability of a sample in the transfer process: the cashmere fineness detection device comprises a chopping assembly, a sample containing assembly, a sliding rail and a detection microscope, according to the cashmere cutting device, the cutting assembly and the detection microscope are combined together through the arrangement of the sliding track, the sample containing assembly horizontally and linearly moves along the sliding track, shaking of the sample containing assembly is not prone to being caused, and then the cut cashmere samples cannot be displaced in the sample containing assembly; according to the cashmere sample collecting device, the cashmere sample collecting assembly is arranged to ensure that chopped cashmere samples can be always kept uniformly distributed, the sample containing assembly seals and stores the collected chopped cashmere samples, the chopped cashmere samples cannot be blown up due to external air flow, and the stability of the samples is ensured to be kept in the moving process.

The present invention relates to an apparatus for on-site measurement of key parameters of radionuclide diffusion behavior, comprising a main apparatus body comprising a water inlet layer, a sealing layer, a water quality analysis layer, a pressure stabilization layer, a power layer, a diffusion layer, and a water outlet layer, arranged in sequence. The water inlet layer, the water quality analysis layer, the pressure stabilization layer, the power layer, and the diffusion layer are sequentially connected; the diffusion layer is connected to the ground surface; and a radioactive nuclide tracer is disposed within the pressure stabilization layer. The present invention also provides a method for on-site measurement of key parameters of radionuclide diffusion behavior. The apparatus and method for on-site measurement of key parameters of radionuclide diffusion behavior described herein have the advantages of equipment safety, sample stability, and long-term durability, and can provide a large amount of data and technical support for safety assessments of radioactive waste disposal sites.

This invention relates to the field of traditional Chinese medicine analysis technology, and in particular to a method for constructing a characteristic chromatogram of Yuquan Capsules. The method includes the following steps: 1. Preparation of a reference solution; 2. Preparation of a test solution; 3. Measurement conditions; 4. Generation of a control characteristic chromatogram. The method for constructing the characteristic chromatogram of Yuquan Capsules was investigated, including instrument precision experiments, method repeatability experiments, and sample stability experiments. In all experimental results, the RSD values ​​of the relative retention times of each peak were ≤1.0%, and the RSD values ​​of the relative peak areas were ≤10.0%. This indicates that the method is effective and can reflect the major chemical components in Yuquan Capsules, allowing for more efficient and rapid control of the overall quality of Yuquan Capsules.

This integrated drying and storage device for XRD analysis of liquid samples includes a drying chamber and a storage chamber. The storage chamber is connected to the outside of the drying chamber. One side of the drying chamber is connected to a first sealing surface via a rotating shaft, and the other side of the storage chamber is connected to a second sealing surface via a rotating shaft. The drying chamber contains a heating chamber with a resistance wire inside. Multiple symmetrically arranged first positioning protrusions are located inside the drying chamber. This integrated drying and storage design simplifies and improves the process, reduces the chance of samples coming into contact with humid air, significantly reduces the probability of sample deliquescence, ensures sample stability, enables rapid analysis, and improves work efficiency and the accuracy of analytical results. The multi-layer sample rack design allows each layer to move vertically, meeting diverse drying and storage needs.

The application provides a sample storage device and method for ecological environment monitoring, multi-stage characteristic identification is performed on the degradation rate of an ecological environment sample, a stage state characteristic of the ecological environment sample is obtained, a sample stability index under a current storage condition is determined according to the stage state characteristic and a performance degradation coefficient in each sealing data, a quality decay characteristic of the ecological environment sample is determined according to the stability index and the effective component content of the ecological environment sample, a balanced preservation condition for maintaining the sample effectiveness of the ecological environment sample is predicted based on the quality decay characteristic, the balanced preservation condition is compared with each external environment parameter collected by an intelligent sensor in multiple stages, an environment deviation value of each temperature and humidity control node is obtained, and the storage state of the ecological environment sample under visual monitoring is classified and determined based on each environment deviation value. Based on the above scheme, the environment classification regulation based on state prediction can be realized.

In some embodiments, the present disclosure provides an icIEF sample matrix that enables icIEF analysis of a pegylated protein in its actual conjugated state. Sample matrices of the present disclosure can include glycine that enables the isolation of co-migrated PEGylated protein charge variants. The sample matrix can also include taurine that further improves the icIEF assay by eliminating the matrix-caused baseline interference. Thus, the sample matrix of the present disclosure comprising a combination of glycine and taurine enables icIEF separation of acidic and basic species of PEGylated proteins from the main peak, allowing for identification / isolation, characterization and quantification of discrete PEGylated protein species. By characterizing PEGylated proteins via icIEF using a sample matrix of the present disclosure, repeatability, linearity, accuracy, sample stability, and method robustness are achieved.

The utility model relates to water sample enrichment technical field discloses a kind of enrichment sampling device of river water body pollutant, including socket, detection frame and multiple enrichment devices.Detection frame adopts cylindrical support design, is connected recessed groove and can be axially rotated on socket top, and its outer periphery is equipped with multiple groups of installation clamping position for installing enrichment device.Spring is equipped with locating bead on socket, and cooperate with stepped limiting recess in the connecting recess of detection frame, reliable limiting and rotating positioning are realized.Equipment is ensured to sink steadily, and detection frame top is equipped with exhaust hole with exhaust valve.Enrichment device adopts modular DGT device, and quick installation and fixation are realized by clamping position groove and plug.This device makes each enrichment device bear water flow impact evenly by rotatable detection frame design, eliminates sampling deviation;Spring bead locking mechanism guarantees sampling stability;Modular design is convenient to operate;Exhaust system ensures sampling accuracy;Multiple sampling unit design improves sampling efficiency.

The invention belongs to the field of animal reproductive physiology, and particularly relates to a nucleic acid combination product, a male sterility detection kit and a detection method. The invention provides a nucleic acid combination product through special screening, the nucleic acid combination product comprises a detection primer group aiming at a gene Bcl2, a gene Tnp1, a gene Rsph9, a gene Nme8 and a gene Spag6, the genes are key genes jointly expressed in blood and testis of a mouse, and combination detection has relatively high specificity and conservative property among species. In addition, the nucleic acid combination product is also suitable for detecting blood, the stability of a sample is high, a subject is not influenced by time and collection environment, and the nucleic acid combination product is convenient and rapid.