Plasmid Prep Quality: How to Identify Supercoils, Nicks, and Circles on a Gel
Understanding the different forms of uncut plasmid DNA on agarose gels is essential for assessing prep quality. The supercoiled plasmid is the desired dominant form, migrating fastest due to its compact structure. Other forms like nicked, linear, denatured, and multimers indicate damage or contamination. Proper gel conditions and controls help identify these forms, guiding troubleshooting and ensuring your plasmid prep is suitable for cloning, transfection, or sequencing applications.
