Method for extracting DNA from blood clot

Operation steps: 1. Take 15ml grinder, add 5ml blood clot, 4-5ml hemolysis reagent, grind until no clot is present. Transfer to a 50 ml centrifuge tube at 2500 rpm for 10 min. 2. Go to the supernatant, wash the fake hemolysis reagent once, 2500 rpm, 10 min, until no red is present. 3. Remove the supernatant, add 1 ml of cell lysate, transfer to a centrifuge tube, add 20 mg/ml proteinase K 10 ml, and water bath at 56 ° C for 3 hours. 4. Add 1 ml of balanced phenol to each tube and mix at 6000 rpm for 10 min. 5. Repeat step 4. 6. Take the supernatant in a 2 ml EP tube, add an equal volume of chloroform / isopropanol, mix, 6000 rpm, 10 min. 7. Take the supernatant in another 2 ml EP tube, add NaAc, mix, add an equal volume of isopropanol, mix, and observe a white precipitate, 10000 rpm, 5 min. 8. Remove the supernatant, add 0.3 ml of absolute ethanol, 10000 rpm, 5 min, remove alcohol, and air dry. 9. Add TE solution, water bath until DNA is dissolved, and measure DNA concentration. Matters needing attention: 1. Observe the color of phenol, usually yellow. If it turns pink, it means it is oxidized and can not be used again. 2. Phenol is highly corrosive and easily causes burns. Once the skin is contaminated, rinse with water and wash with soap or diluted soda. Remember to use alcohol instead. 3. Hemolysis reagent, cell lysate, TE solution requires high temperature and high pressure disinfection. 4. The nucleic acid absorbs ultraviolet light by containing a conjugated benzene ring, and the maximum ultraviolet light absorption wavelength of DNA and RNA is 260 nm. When the light absorption value of 5.260 nm is 1 (A260 = 1) and the mass concentration of dsDNA is equivalent to 50 ug/ml, the concentration of dsDNA is: A260 value × 50 ug / ml × dilution factor. 6. Purity: A260 /A280 indicates that if the value of pure dsDNA is about 1.8, if it is greater than 1.8, it indicates RNA contamination. If it is less than 1.8, it indicates that there is protein or saturated phenol contamination in the sample. 7. The extracted DNA should be completely dissolved before measuring its concentration, and when measuring the concentration, the diluted sample must be mixed, otherwise the measured results will have a large deviation.

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