Regardless of what protocol you use, and what the advertised efficacy of that protocol might be, in any situation like this I think the important thing to consider is: what would happen if the material taken from a re-used column was contaminated by a previous application? Can you live with the consequences of such contamination?
If you are preparing DNA for further use (PCR and/or cloning and/or transformation) then you run the risk of propagating a contaminant through subsequent steps and getting into a real mess. I worked in a lab once where one postgrad ended up spending several weeks working with a cloned fragment that was actually derived from someone else's work in the same lab (although not due to re-use of a column as far as I remember).
If you are preparing protein samples then the risks are possibly reduced, but if the protein sample is going to be subjected to sensitive methods (blotting, MS) then again, could get messy.
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