Hop DNA Isolation: Difference between revisions

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#Assume 90% of mass is water weight.
#Assume 90% of mass is water weight.
#Add 3.3 ml of buffer per gram of wet (16 ml per gram of dried) hop leaves, and incubate for 1 to 4 hours at 60-65°C.
#Add 3.3 ml of buffer per gram of wet (16 ml per gram of dried) hop leaves, and incubate for 1 to 4 hours at 60-65°C.
#Transfer 900 &mu;l into fresh tube and add 600 &mu;l of 24:1 CHCl<sub>3</sub>:octanol to each and shake.
#Transfer 900 &mu;l into fresh tube
#add 600 &mu;l of 24:1 CHCl<sub>3</sub>:octanol and invert gently (do NOT vortex!).
#Centrifuge at 5000g for 10 minutes.
#Centrifuge at 5000g for 10 minutes.
#Remove supernatant and put in new vials (800 &mu;l in each).
#Transfer supernatant (800 &mu;l) into new 2-ml tube.
#Add 5&mu;l of RNAase in each vial and incubate at 37&deg;C for 30 minutes.
#Add 5&mu;l of RNAase and incubate at 37&deg;C for 30 minutes (or more).
#Remove supernatant (discard) and add 0.5 ml of buffer wash solution to each pellet and allowed to sit until needed.
#Add 0.6 volumes Isopropanol and mix gently by inverting the tubes. Check for DNA precipitation.
#Dry pellet and add 100 &mu;l ddH<sub>2</sub>O and incubate at 45&deg;C until needed.
#Spin down for 10 min.
#Add 500 &mu;l wash buffer and incubate 10 min. at RT.
#Carefully remove wash buffer. Don't lose DNA pellet!
#Briefly centrifuge to collect pellet at bottom of tube - remove any remaining wash buffer.
#Dry pellet at RT or 50&deg;C to speed up.
#Add 100 &mu;l ddH<sub>2</sub>O to dissolve DNA.
#Store at -20&deg;C until needed.
#Run electrophoresis for analysis.
#Run electrophoresis for analysis.


Revision as of 11:55, 18 January 2008

Hop DNA Extraction Protocol

  1. Obtain an adequate amount (specify) of fresh hop leaves and crush them with liquid Nitrogen and a small amount of Carborundum powder (fine 320 grit).
  2. Assume 90% of mass is water weight.
  3. Add 3.3 ml of buffer per gram of wet (16 ml per gram of dried) hop leaves, and incubate for 1 to 4 hours at 60-65°C.
  4. Transfer 900 μl into fresh tube
  5. add 600 μl of 24:1 CHCl3:octanol and invert gently (do NOT vortex!).
  6. Centrifuge at 5000g for 10 minutes.
  7. Transfer supernatant (800 μl) into new 2-ml tube.
  8. Add 5μl of RNAase and incubate at 37°C for 30 minutes (or more).
  9. Add 0.6 volumes Isopropanol and mix gently by inverting the tubes. Check for DNA precipitation.
  10. Spin down for 10 min.
  11. Add 500 μl wash buffer and incubate 10 min. at RT.
  12. Carefully remove wash buffer. Don't lose DNA pellet!
  13. Briefly centrifuge to collect pellet at bottom of tube - remove any remaining wash buffer.
  14. Dry pellet at RT or 50°C to speed up.
  15. Add 100 μl ddH2O to dissolve DNA.
  16. Store at -20°C until needed.
  17. Run electrophoresis for analysis.

Prepared solutions

  1. Buffer: 100 ml: 50 mM Tris/HCl (ph 8.0), 1.8 M NaCl, 50 mM EDTA. Then add 10 mg/ml of CTAB ( 200 mg per 20 ml buffer, final conc. = 1%) and 1 μl/ml 2-mercaptoethanol (20 μl to 20 ml buffer; final conc. = 0.1%).
  2. Wash buffer 100 ml: 200 μl 5M NH4OAc (final conc. = 10 mM), 76.0 ml abs. ethanol (final conc. = 76%), and 23.8 ml of sterilized water.
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