Lipofectin mediated delivery of oligo

[Hung-yiu Ho]

I have used lipofectin to deliver oligo to a lymphoma cell. when I 
incubated 30 microlitre of lipofectin with 7 microgram of oligo (final 
conc: 1 micromolar) in 200 microlitre of DMEM (Gibco). After addition of 
cell, the volume is made up to 1 ml. Upon incubation of oligo with lipid, 
a coarse ppt  formed. Under microscope, the ppt seems to be very large. 
I cannot figure out what happens. The DNA and lipid conc do not exceed 
what are stated in protocols supplied by the vendor. Any help is 
appreciated. Thanks