petri plates and sampling bottles

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Death Adder
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petri plates and sampling bottles

Post by michimichi » Thu Jan 26, 2012 2:52 am

is it necessary for petri plates to be dried after autoclaving and prior to testing?
And so with the sampling bottles prior to water sampling?

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King Cobra
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Post by sachin » Thu Jan 26, 2012 5:56 am

Ya! drying avoids any type of contamination possibility.
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Re: petri plates and sampling bottles

Post by threegirlmom » Thu Jan 26, 2012 4:24 pm

Even though the condensed water is sterile it significantly contributes to contamination. I find using plastic, pre-sterilized dishes works the best for me. It costs me more in time and money to have to replate contaminated samples and therefore the pre-sterilized dishes work better.

As far as the bottles are concerned, if you place them on a rack upside down in the autoclave the inside of the bottle stays relatively dry.

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