IGEM:UC Berkeley/2006/Minipreps: Difference between revisions
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'''MINIPREP (1mL - 5mL) Procedure for Plasmid DNA Purification''' | '''MINIPREP (1mL - 5mL) Procedure for Plasmid DNA Purification''' | ||
''(using the QIAGEN kit)'' | ''(using the QIAGEN QIAPrep Spin Miniprep kit)'' | ||
#Palette cells by centifuging from liquid culture. If the culture is on a plate, resuspend the bacteria in 1mL LB using a scraper and pipette into a tube. Dip the scraper in ethanol and burn it to kill cells before paletting another plate. | #Palette cells by centifuging from liquid culture. If the culture is on a plate, resuspend the bacteria in 1mL LB using a scraper and pipette into a tube. Dip the scraper in ethanol and burn it to kill cells before paletting another plate. | ||
#Place the tubes in a centrifuge in a symmetrical pattern and spin at top speed for 1 minute. | #Place the tubes in a centrifuge in a symmetrical pattern and spin at top speed for 1 minute. |
Revision as of 14:22, 8 June 2006
MINIPREP (1mL - 5mL) Procedure for Plasmid DNA Purification (using the QIAGEN QIAPrep Spin Miniprep kit)
- Palette cells by centifuging from liquid culture. If the culture is on a plate, resuspend the bacteria in 1mL LB using a scraper and pipette into a tube. Dip the scraper in ethanol and burn it to kill cells before paletting another plate.
- Place the tubes in a centrifuge in a symmetrical pattern and spin at top speed for 1 minute.
- Flick media out into sink.
- Add 250uL of P1 buffer into each tube. Resuspend the cells using a vortexer.
- Add 250uL of P2 buffer (a base that denatures everything and causes cells to lyse). Gently mix up and down. Solution should become clearer.
- Add 350uL of N3 buffer (an acid of ~pH5 that causes all the junk the precipitate and leaves all the desired products in solution). Slowly invert a few times, then shake.
- Spin in centrifuge at top speed for 10 minutes.
- Label blue columns with a lab pen (not a sharpie because an ethanol wash would erase it)
- Pour liquid into columns, and place the columns into the centrifuge. Spin at 12000rpm for 30 seconds.
- Dump liquid out of the collectors under the columns (the DNA should be stuck to the white resin)
- Wash each column with 500 uL of PB buffer.
- Spin in centrifuge at 12000rpm for approximately 15 seconds, then flick out the liquid again.
- Wash with 750uL of PE buffer (washes the salts off the resins).
- Spin in centrifuge at 12000rpm for approximately 15 seconds and flick out liquid again.
- Spin in centrifuge at full speed for 1 minute to dry off all water and ethanol.
- Label new tubes (include "Rescue" or "Mini") and put columns in them.
- Elute them by squirting 50uL of water down the middle of the column (don't let it stick to the sides).
- Spin in centrifuge at top speed for 30 seconds.
- Take out columns and cap the tubes.
- Clean up - note the P1 buffer is stored at 4degC and all the rest at room temperature.
-SIL 6/8/06