rRNA contamination after RNA poli-A purification with oligo-dT

[CARLOS ALEXANDRE SANCHEZ FERREIRA - 218]

I am having trouble with rRNA contamination in RNA poli-A 
purifications with oligo-dT\celullose from ticks. I have tried two common 
methods plus the Quickprep Micro mRNA Purification Kit (Pharmacia) 
and I have not found any difference between them (regarding to the 
degree of contamination). If anybody have any idea of how to deal 
with this kind of problem, please send it to me.

       Carlos Alexandre S. Ferreira