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HELP HELP HELP needed with RNA extraction

Eric Sarnighausen hamburg at sage.cc.purdue.edu
Mon May 13 16:16:42 EST 1996

I am currently trying (again and again.....) to extract RNA from woody samples
(Cornus sericea L.). I sterilize all the my equipment, use autoclaved and DEPC-
treated water, buffers and solutions and wear gloves during the extraction
procedure. The extraction buffer contains 4 M guanidine thiocyanate and I use a
cesium chloride gradient followed by phenol/chloroform extraction and ethanol
precipitation (as described by Clausen and Apel [1991]. Plant Mol. Biol. 17(4):
669-678) for the isolation of RNA from the xylem of poplar trees).
The purity of the RNA (E260/E280) is 2.0, but no matter whether I use fresh or
freeze dried material: the RNA is always completely degraded.
Any help on this matter would be greatly appreciated.

                       Thanks in advance


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