Phenol Purification
of DNA From Low Melting Point Agarose
-
Place phenol mix at 37oC
for at least 1 hour
-
Melt excised agarose fragment
at 65oC. for 10 minutes or until agarose
is molten, then place molten agarose at 37oC
for 2 minutes
-
Add 0.5X volume of phenol mix
and shake vigorously for 45 seconds
-
Centrifuge for 5 minutes at room
temperature and transfer aqueous layer to clean
tube
-
Repeat phenol extraction and centrifugation
step
-
Transfer aqueous layer to a clean
tube and add 1/50 volume of 5M NaCl, shake for
45 seconds, and centrifuge for 5 minutes at room
temperature
-
Transfer aqueous material to a
clean tube, add 2X volume of EtOH and precipitate
(either 15 minutes at -70oC. or at
least 1 hour at -20oC)
-
Centrifuge for 15 minutes and
aspirate off aqueous material
-
Wash pellet in 1X volume of 70%
EtOH and repeat centrifugation
-
Aspirate off aqueous material
and air dry pellet for 5 minutes (or dry in speedvac
for ~2 minutes)
-
Resuspend pellet in 20µl TE buffer
Phenol mix: 25ml pure phenol, 15ml H2O,
400ml 1M Tris-HCl, pH to 8.0 with 2 drops 5M NaCl
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