What QC is done after plasmid prep? August 14, 2019 12:07 Quantification by OD and restriction digestion of 1-2 sites, followed by electrophoresis. Related articles What information should I provide for the plasmid preparation? What bacteria strain do you use to grow DNA? Does your lab do DNA extraction, isolation, cleaning, and purification? How much could it cost to the plasmid preparation? Do you ship the plasmid prep in lyophilized or in liquid form? If liquid, what buffer is used and what is the concentration?