Hi,
I have to extract genomic DNA from plasma samples and will use the Qiamp DNA mini and blood kit (QIAGEN). At the moment the plasma samples are stored at -80° and they were obtained from whole blood using a single centrifuge 1800 rpm x 10min. I would like to know whether it is appropriate to centrifuge the sample (and thus concentrate the remaining cells into a pellet) before proceeding with the addition of proteinase K, and if so, how should the centrifugation be performed?
Thanks!