575results about How to "No cross reaction" patented technology

Belonging to the field of biotechnologies, the invention discloses a competitive ELISA kit for detection of a peste-des-petits-ruminants virus antibody. The kit comprises a detection system composed of a coating antigen reaction solution and a monoclonal antibody reaction solution. The kit adopts prokaryotically expressed peste-des-petits-ruminants Nigeria 75/1 strain N protein as the coating antigen and employs a monoclonal antibody against N protein as the competitive antibody. The antibody against a peste-des-petits-ruminants virus in sheep serum is detected according to a competitive ELISA principle. The kit provided in the invention can rapidly and specifically detect the peste-des-petits-ruminants virus antibody in serum, and simultaneously has the advantages of large-scale production of monoclonal antibodies, good reaction specificity, high sensitivity, simple operation, low cost, stable, reliable and easily observable reaction results, thus being very suitable for import and export quarantine of sheep, food hygiene and screening of large batches of samples in livestock breeding farms, and being easy for large-scale popularization and application.

The invention belongs to the technical field of nucleic acid detection, and relates to a mycobacterium tuberculosis complex detection kit and method based on a CRISPR-Cas12a system. According to the kit, the detection sensitivity is improved by adopting a recombinase polymerase amplification technology, CRISPR-Cas12a is used for specifically targeting a mycobacterium tuberculosis complex target sequence and then activating the bypass cutting activity of Cas12a, and a mycobacterium tuberculosis complex can be sensitively and specifically detected from sputum. The kit and method have the advantages of being non-invasive, capable of detecting the mycobacterium tuberculosis complex frequently and repeatedly, high in detection speed and the like. Compared with an existing PCR detection method,the method based on the CRISPR-Cas12a system does not need a thermal cycler with heating and cooling functions, can detect the mycobacterium tuberculosis complex in sputum through fluorescence reading, has the advantages of being low in cost, easy and convenient to operate, high in sensitivity, good in specificity and the like and is suitable for clinical large-scale application.

The invention provides an immunity diagnosis test kit for detecting II-type dengue virus antigen, which comprises a porous reaction plate covering monoclonal antibody DV2-M6, a sample treatment liquid, a monoclonal antibody DV2-M15 marked with a label, a positive contrast, a negative contrast, a concentration washing liquid, a develop liquid and a termination liquid, wherein the monoclonal antibodies DV2-M6 and DV2-M14 of the test kit can be specifically combined with NS1 protein of II-type dengue virus, without cross reaction with other three kinds of serotype dengue viruses NS1 and respectively combined with different antigen points of NS1, while the check sensitivity of NS1 protein of II-type dengue virus can reach 3ng/ml and the check sensitivity of culture supernatant of II-type dengue virus infection cell is 8 power of Pan-E dengue early elisa test kit, thereby improving the sensitivity of clinical serum sample check.

The invention discloses a fluorescent microsphere lateral chromatographic detection strip for multiple joint inspection of trace target substances as well as a preparation method and application thereof. The fluorescent microsphere lateral chromatographic detection strip is characterized by comprising a soleplate, wherein the top of the soleplate is sequentially provided with a sample absorption pad, a combination pad, a chromatographic film and a piece of water absorption paper from left end to right end, the right end of the sample absorption pad is pressed to be attached onto the left end of the combination pad, the right end of the combination pad is pressed to be attached onto the left end of the chromatographic film, the left end of the water absorption paper is pressed to be attached onto the right end of the chromatographic film to form a lateral chromatographic detection structure; the chromatographic film is provided with a detection line and a quality control line from left to right; the combination pad is formed by a polyester fiber film and fluorescent microspheres marked with different ligands on the polyester fiber film, and the chromatographic film consists of a nitrocellulose film and a plurality of detection lines which are arranged on the nitrocellulose film and contain different ligands which can be specifically combined with the target substances. The fluorescent microsphere lateral chromatographic detection strip can be used for performing multiple joint inspection on a plurality of trace target substances simultaneously, all display results have no cross reaction and are dependent from one another, the detection sensitivity and accuracy can be remarkably improved, rapidness and convenience in operation can be realized, and an important significance on biological detection and early diagnosis and treatment of diseases can be achieved.

The invention discloses a spray for killing mites on the body surface of a pet and a preparation method of the spray. The spray is simple in preparation method, convenient to use, good in curative effect and high in safety. The spray for killing the mites on the body surface of the pet is technically characterized by comprising the following ingredients in parts by weight: 75-95 parts of alcohol, 0.1-1 part of flucycloxuron, 0.1-1 part of phoxim, 5-20 parts of traditional Chinese medicine combination extracts, and 0.1-1 part of eugenol, wherein a traditional Chinese medicine composition comprises the following raw materials in parts by weight: 15-20 parts of radix stemonae, 3-5 parts of fructus cnidii, 3-5 parts of sophora flavescens, 2-4 parts of cortex phellodendri, 3-5 parts of cortex dictamni, and 4-7 parts of fructus kochiae. The spray belongs to the technical field of animal medicines.

The invention provides a test kit for detecting nucleic acid of respiratory tract pathogens. The kit comprises a CRISPR-Cas detection system: crRNA, a primer pair, Cas protein and a nucleic acid probethat are described in the invention. The invention further provides a detection method of the nucleic acid of the respiratory tract pathogens, a combination of the crRNA and the primer pair and application of the combination. The test kit and the detection method disclosed by the invention can be used for directly observing results by naked eyes without depending on a large instrument, and detection can be realized under a mild condition, so that the detection is more convenient; the test kit and the detection method provided by the invention can be used for efficiently and rapidly detecting/diagnosing the respiratory tract pathogens (such as flu A, flu B and COVID-19), have relatively high specificity and sensitivity, and can be used for detecting and screening the respiratory tract pathogens, for example, rapidly distinguishing various respiratory tract pathogens including the flu A, the flu B and the COVID-19.

The invention relates to a double-antibody biotin-Avidin ELISA (enzyme-linked immuno sorbent assay) detection kit for cattle viral diarrhea virus antigen and an application method thereof. The kit comprises washing liquid for ELISA detection, developing liquid, stopping liquid, Streptavidin-HRP, positive control and negative control and is characterized by further comprising an ELISA plate coating cattle viral diarrhea virus single antibody 3D8 and a cattle viral diarrhea virus single antibody 3F9 marked by biotin. The detection without cross reaction is performed by using the kit, thereby being capable of preventing leak detection caused by low titer in the antibody and having high specificity; a biotin-affine sensitizer is used for amplification, thereby increasing the flexibility, improving the detection rate, and simultaneously reducing the amount of second antibody; and the kit is suitable for being used widely.

The invention relates to a newcastle disease virus/avian influenza virus H9 subtype/infectious bronchitis virus triplex fluorescence quantification detection reagent and a detection method and belongs to the technical field of animal quarantine. A newcastle disease virus M gene coding region specific sequence, an avian influenza virus H9 subtype H gene coding region specific sequence and a chicken infectious bronchitis virus M gene coding region specific sequence are selected as target regions, and on the basis of multi-sequence comparison, primer and probe design is conducted. The length of primers is about 20 basic groups, the GC content is 50-60%, a two-stage structure and repeatability do not exist in the primers, no complementary sequence exists between the primers or in the primers, and the melting temperature (Tm value) difference between the primers is smaller than 5 DEG C. In order to guarantee universal use of a newcastle disease virus probe, the length of the probe is only 13 basic groups, the probe is modified by LAN, and the Tm value of the probe is increased. The lengths of the other two virus probes are both about 25 basic groups, and the Tm values are about 5 DEG C higher than those of the primers.

The invention, which belongs to the technical fields of immunology and food safety analysis, relates to an enzyme-linked immunosorbent assay kit for detecting skeletal muscle troponin I of cattle or sheep, and a preparation method thereof and application thereof. The kit comprises an enzyme label plate coated with a capture antibody, a horseradish-peroxidase-labeled detection antibody, a skeletalmuscle troponin I standard solution of cattle or sheep, a substrate coloured solution, a stop solution, and a concentrated washing solution. The capture antibody is obtained by secretion of a hybridoma cell line 3A8 with the preservation number of CCTCC NO:C2018217; and the detection antibody is obtained by secretion of a hybridoma cell line 3D3 with the preservation number of CCTCC NO:C2018218. The kit has advantages of high sensitivity, high precision, high accuracy, and low cross-reaction rate and is suitable for large-scale sample detection.

The invention provides a double FQ-PCR detection kit for identifying PCV (porcine circoviruses) type 2 and type 3. By aiming at the characteristic of low Rep protein and Cap protein gene homology of PCV2 and PCV3, a pair of specific primers and a TaqMan MGB probe (SEQ ID NO:1-6) are designed by using Rep protein gene of PCV2 and Cap protein gene of PCV3 as amplification target regions; the real-time fluorescence quantitative PCR technology is used; the identification detection of the PCV2 and the PCV3 is realized. The detection kit provided by the invention is applicable to viral nucleic aciddetection in samples such as nose swab, oral cavity secreta, faeces, serum, lungs, lymph gland and kidneys of a suspected PCV infectious pig; the sensitivity can reach 1.0*10<1> copy/mu L; the crossedreaction with other pathogene capable of generating mixed infection or with similar of infection symptoms do not exist.

The invention discloses a universal primer and probe combination for detecting foot and mouth disease viruses through RPA (recombinase polymerase amplification)-lateral flow assay technology. The forward primer sequence is shown as SEQ ID No.1, the reverse primer sequence is shown as SEQ ID No.2, and the probe sequence is shown as SEQ ID No.3. The invention also discloses a kit for detecting foot and mouth disease viruses. Detection with the primers and probes involved in the invention only needs virus RNA extraction on clinical samples and isothermal amplification after one-step process reverse transcription into cDNA, thermal cycling reaction is not needed, amplification in a PCR instrument is unnecessary, and the result can be clearly displayed on a lateral flow chromatography test strip. The primer and probe combination and the kit provided by the invention have the advantages of high sensitivity, strong specificity, simple reaction procedure, short detection time and the like, and are suitable for rapid, accurate and simple detection of foot and mouth disease viruses on a cattle farm.

The invention relates to a primer and a method for detecting GI type and GII type norovirus by utilizing the primer, belonging to the technical field of biological detection. The sequence of the primer is as follows: Nov-F: 5-GTGAATGAWGATGGCGTCKA-3, Nov-R: 5-GTHAGWATCCAGGGGTCAAT-3. The invention focuses on the design of the sequence of the primer, the composition of an RT-PCR (reverse transcription-polymerase chain reaction) system, the selection of reaction conditions and the judgment of reaction results can be performed according to the conventional methods in the field. By adopting the primer and the method provided by the invention, a pair of primers can simultaneously detect and differentiate the GI type and the GII type norovirus in a same reaction tube, thereby not only simplifying the operation steps, but also shortening the detection time.

The invention relates to a hybridoma cell strain 1C8 and an anti-aflatoxin G1 monoclonal antibody produced by the same. The hybridoma cell strain 1C8 (CCTCC NO: C201017) provided by the invention can be used for preparing a high titer anti-aflatoxin G1 monoclonal antibody. The titer of an anti-aflatoxin G1 mouse ascites antibody measured by enzyme-linked immunosorbent assay (ELISA) can reach 8.19*10<5>. The anti-aflatoxin G1 monoclonal antibody provided by the invention has high sensitivity and good specificity, has a 50% inhibition concentration IC50 for aflatoxin G1 being 13.92 ng/mL, has no cross reaction with aflatoxin B1, aflatoxin B2, or aflatoxin M1, and can be used for the determination of G1 aflatoxin.

The invention discloses a primer, probe and kit for detecting foot-and-mouth disease virus in aerosol through a RPA-lateral flow assay technology. A primer probe liquid, popular primer and probes are arranged in the kit, wherein the primer probe liquid consists of a popular subtype primer which is used for detecting the foot-and-mouth disease virus through an RPA technology, and the probes, and the popular primer and the probes are in the primer probe liquid. The primer, the probe and the kit, which are disclosed by the invention, adopt the RPA-Lateral flow assay technology to establish a method for rapidly detecting the FMDV of cattle for the first time, and through the evaluation of specificity and evaluation of sensitivity, the sensitive, reliable and new method can be used for a clinical detection on site of the FMDV. Through the combination of the primer and the probes, which are disclosed by the invention, the method for detecting the FMDV in the aerosol in a subtype manner through the RPA technology has the advantages of being higher in sensitivity, specificity and repeatability.