I performed DNA extraction using the Quiagen Blood & Tissue Kit on a set of liver samples; and happened to find tissue in the final DNA extract (black precipitate at the bottom). I did add the mixture of tissue and lysate into the microfuge DNA column; is that what went wrong? Do i add just the cell lysate?
Only some of my samples show this impurity in the final DNA extract vial. Can someone help me as to telling me how to avoid this?