plant rna extraction : purity problems

Sam Lievens salie at
Mon Jul 24 14:55:00 EST 2000

hi all,

i'm having serious problems getting pure rna out of the roots of our
plant. it's a tropical legume. getting rna from the aerial parts is no
problem (od 260/280 of 2.0 and 260/230 of about 2.3), pure enough to
prepare cdna of.
but using the same protocol (licl based method) on roots gives me dirty
rna (od 260/280 still around 1.8 but 260/230 of only 1-1.5 so i guess
caused by polysaccharide contamination). i tried other methods (trizol,
quiagen rneasy columns) but it doesn't help.
so two questions: how can i get pure rna and how can i further purify
the dirty rna i already have (i already precipitated it again with licl,
doesn't help; i did 2 fenol/chloroform extractions and ethanol
precipitation, doesn't help neither).


Sam Lievens

K.L. Ledeganckstraat 35    -    9000 Gent    -      Belgium
tel: +32(0)92645183                     fax: +32(0)92645349
salie at

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