Enzyme-linked immunosorbent assay kit for detecting skeletal muscle troponin I of cattle or sheep, and preparation method thereof and application thereof
An enzyme-linked immunosorbent reagent, troponin technology, applied in the fields of immunology and food safety analysis, can solve the problems of protein denaturation, loss of antigenicity and water solubility, and difficulties in immunological methods, and achieve high sensitivity and specificity
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Embodiment 1
[0050] Embodiment 1 Preparation of bovine or sheep skeletal muscle troponin I antigen according to the present invention
[0051] Take skeletal muscle of cattle or sheep to remove fat and connective tissue, grind and mix evenly, weigh 40g and add 0.15M NaCL solution (1:2w / v); after further mixing, ultrasonically extract for 5min (50W, 20KHz), and then use After heating in boiling water for 20 minutes, centrifuge at 2000g for 30 minutes; remove the precipitate, take half of the supernatant and filter it as treatment solution 1. The other half of the supernatant was subjected to high pressure at 121°C for 30min, centrifuged at 5000g for 30min, filtered with Whatman No. 1 filter paper, added 90% ethanol (1:3.74v / v) to the filtrate, and the mixture was centrifuged at 7000g for 20min, and the precipitate was dried at 37°C , after reconstitution with physiological saline, it becomes the treatment solution 2. Treatment solution 1 and treatment solution 2 were identified by SDS-PAGE ...
Embodiment 2
[0052] Embodiment 2 Preparation of bovine or sheep skeletal muscle troponin I monoclonal antibody of the present invention
[0053] 1. Animal immunization: select the extracted immune antigen, immunize female Balb / c mice aged 6-8 weeks, and immunize once every 2 weeks. After 3 times of immunization, blood is taken from the tail to determine the titer and inhibition rate, and the immune result is selected. Optimal mouse preparation for fusion;
[0054] 2. Cell fusion: take the splenocytes of the mouse selected in step 1 and the mouse myeloma SP2 / 0 cells for fusion, measure the supernatant by indirect ELISA method, select the wells with high positive, and sub-select the positive wells by the limiting dilution method. Cloning until the establishment of a hybridoma cell line producing a single monoclonal antibody against bovine or sheep skeletal muscle troponin I;
[0055] 3. Large-scale preparation of monoclonal antibodies: select large female Balb / c mice, use the method of in v...
Embodiment 3
[0056] Example 3 Identification of Capture Antibody and Detection Antibody Characteristics of the Present Invention
[0057] 1. Potency determination
[0058] Dilute the detection antigen to 5 μg / ml with pH 9.6 carbonate buffer to coat the detection plate, and dilute the purified monoclonal antibody at 1:2000, 1:4000, 1:8000, ... 1:1024000, Add it into the well of the microtiter plate, add HRP-labeled goat anti-mouse secondary antibody after the reaction, and finally use TMB to develop the color. The results show that the purified bovine skeletal muscle troponin I monoclonal antibody has an effect The price reaches 1:10 6 , the titer of the purified goat skeletal muscle troponin I monoclonal antibody concentration was 1mg / mL reached 1:2.56×10 5 .
[0059] 2. Subtype determination
[0060] The mouse monoclonal antibody subtype identification kit purchased from Sigma was used to determine the subtype. The results showed that the subtype of bovine skeletal muscle troponin I m...
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