Qiagen Miniprep
Materials
- Qiaprep Spin Kit (27106)
- TE buffer
- 1.5 mL microcentrifuge tubes (1 per culture)
Procedure
- Grow DH5α with appropriate plasmid in 4 mL liquid LB+antibiotic
for 12–18 hours - Label your spin columns and microcentrifuge tubes
- Centrifuge 1.6 mL of each culture in a microcentrifuge tube at full speed for 30 seconds
- Dump and tap out supernatant
- Resuspend pellet in 250 μL P1
- The P1 is kept in the fridge
- Make sure to use P1 that has RNAse added
- Add 250 μL P2
- Immediately invert 3 times
- Let stand for 2 minutes
- Add 350 μL N3
- Immediately invert 8 times
- Centrifuge for 6 minutes at full speed
- Carefully move the supernatant (~820 μL) to a spin column
- Centrifuge for 30 seconds at full speed
- Remove flowthrough
- Add 700 μL of wash buffer PE to column
- Centrifuge for 30 seconds at full speed
- Remove flowthrough
- Centrifuge for another 60 seconds at full speed
- Move column to a labeled 1.5 mL microcentrifuge tube
- Add 50–100 μL TE directly to disk
- Don't touch the membrane with your tip
- Let stand 1–2 minutes
- Centrifuge for 60 seconds at full speed to elute DNA
Adapted from Qiagen handbook