Place the QIAprep column in a clean 1.5 ml microcentrifuge tube. To elute DNA,
add 40 µl Buffer EB (10 mM Tris·Cl, pH 8.5) or water to the center of each QIAprep
spin column (don’t touch gel matrix with tip), let stand for 1 min, and centrifuge for 1 min. The flowthru contains your plasmid DNA. Label tube with plasmid name, your initials, date. Determine concentration using the NanoDrop machine.