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agars

Graham Shepherd muhero.nospam at globalnet.co.uk
Wed Jul 4 16:46:29 EST 2001


magix <keicheng at magix.com.sg> wrote in message
news:9hus0l$ha4$1 at violet.singnet.com.sg...
> Hi
>
> I am having trouble with my experiment (water analysis).
> The method just states "agar" as a solidifying agent and
> we bought Agar Grade A. Somehow, it won't set.
> The author of the method recommended Bacto Agar.
> Is there any difference between these two agars?
>
> If there are so many solidifying agars (which are not selective) then how
do
> you go about choosing the right one for your experiment?
>
> Kei
>
>

How much are you using and how hot is your sample? Normally you use between
0.5% and 1.5%. ( 5 - 15 grams per litre). Although you need to heat it to 95
degrees C to get the agar into solution, it won't set until it's cooled to
about 40 degrees C (varies with concentration and the purity of the agar).
If you are using low pH material the agar strength can be reduced.

GS





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