I usually used Lipofectamine RNAiMAX for siRNA transfection. However, I’ve also tried with Lipofectamine 3000 several times and it's worked. This is protocol:
Cells: 60-80% confluent on the day of transfection.
siRNA 10pmol/ul
Tube A: OptiMEM or medium free serum : 5ul + Lipofectamine 1.5ul
TubeB: OptiMEM or medium free serum : 5ul + siRNA 0.3ul (3pmol)
Hi Hamzeh, this is Yun- I am a Sr. Product Manager at Thermo Fisher managing our Lipofectamine reagents. Our R&D scientist can help you on this. Please drop me an email to get this started if you are interested.