Total amount of DNA/plasmid could be 1-5 ug. Volume is also important for high efficiency transformation. It’s not good to use more than 2.5ul of plasmid. Start with 1ul of plasmid of 1-5ug/ul concentration.
To add to the excellent answer above, unless the goal of your project is to optimize some aspect of transformation efficiency, then "good enough and it's working" is your goal.
Most molecular protocols have a range of conditions where they will give you the desired result (e.g. transformed cells). It's only when you run into problems that you start to consider optimizing.
Good luck!
As a note, for electroporation sometimes it is good to start with a lower added volume of plasmid in case your plasmid prep is salty. If the plasmid needs to be diluted prior to use just use sterile water, not tris/edta buffer or elution buffer. If the salt level is too high you can get an arc in your sample (you'll know if this happens if there is a pop/zap sound and your sample may even pop open/out of the machine). If that happens, you'll need to use less plasmid and try again.
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