The process performance analysis and quality evaluation ofthe final pDNA preparations indicates that the outcome of down-stream processing is slightly affected by strain genotype. StrainsGALG20 and MG1655endArecA were superior to DH5 sincehigh contents of pDNA were obtained in alkaline lysates andthe final product fulfilled the requirements recommended bythe Food and Drug Administration (FDA) (CBER/FDA, 2007). Theplasmids obtained from each specific strain were also usedto transfect cultured CHO cells. No difference was observedbetween the samples regarding transfection efficiency (data notshown).