filter-sterilized MilliQ water for PCR?

[Wilson]

Dear Mr. Grant,
	Is it possilbe that contaminants can be introduced into the
reagents during autoclaving?  I always sterile the reagents (e.g LB,
glycerol and transformation buffer) for competent cell preps by autoclave
and the transformation efficiency of my competent cell is often low and
unstable.  I would like to know the problem whether casued by the
autoclaving the reagent.  


> One problem with autoclaving is that there is all sorts of crap in the
> bottom of your autoclave or steam supply from broken bottles, etc, which
> gets sprayed around and into bottles (which have loose lids, of course).
> 
> btw, never ever autoclave stuff for competent cell preps unless it is in a
> sealed bag.
> 

Thank you very much


Wilson