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  • Title: Isolation of in vitro synthesized covalently closed circular double-stranded DNA by selective denaturation and filtration.
    Author: Shenoy S, Ehrlich M.
    Journal: Prep Biochem; ; 14(5):485-97. PubMed ID: 6242068.
    Abstract:
    Based upon their resistance to irreversible denaturation, covalently closed circular (CCC) DNA (non-nicked, double-stranded circular molecules) can be purified by alkaline denaturation, neutralization, and filtration through a nitrocellulose membrane. This procedure offers a simple means of isolating in vitro synthesized CCC DNA molecules. The preparations of molecules obtained by this method consisted of 91-97% CCC DNA and contained no detectable inhibitors of biological activity or enzymatic digestion.
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