Materials: 1.TENS solution: 10 mM Tris (pH to 7.5) 1 mM ethylenediaminetetraacetic acid (pH to 8.0 to dissolve) 0.1 N sodium hydroxide 0.5 % sodium dodecyl sulfate 2.3 M Sodium acetate, pH 5.2 3.Pre-chilled (at -20 ℃) 100 % ethanol 4.70 % Ethanol 5.Distilled water 6.Overnight bacterial culture (LAB 5) Supplies: 1.Micropipetter and tips 2.Vortex mixer 3.Microcentrifuge and tubes Procedures: 1.Spin 1.5 ml of overnight bacterial culture for 30-60 seconds in a microcentrifuge. (observation: bacteria form a pellet at the bottom of the tube.) 2.Decant supernatant, leaving 50-100 μl in the tube. 3.Vortex to resuspend the bacteria pellet completely. 4.Add 300 μl of TENS solution. 5.Vortex for 5 seconds to mix. (observation: the contents of the tube should become slimy.) 6.Add 150 μl of the sodium acetate. 7.Vortex for 5 seconds to mix. 8.Spin for 2 minutes in a microcentrifuge. (observation: a white pellet, containing bacterial debris, is formed at the bottom of the tube.) 9.Transfer supernatant to a fresh tube. 10.Add 0.9 ml of pre-chilled 100 % ethanol. 11.Spin for 5 minutes in a microcentrifuge. (observation: a white pellet, containing plasmid DNA and bacterial RNA, is formed at the bottom of the tube.) 12.Discard supernatant and add 1 ml of 70 % ethanol. 13.Discard the ethanol and add another 1 ml of 70 % ethanol. 14.Withdraw and discard as much liquid (ethanol) as possible then air-dry the pellet. 15.Resuspend the pellet in 30 μl of distilled water and keep at 4 ℃or -20 ℃. Results: 1.Plasmid DNA is now ready for estimation of DNA concentration (LAB 4) followed by restriction digest (LAB 3). 2.Typical yield is 2-3 μg. |
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