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Amazon Shop for: Agar, Peat, pH Test Strips

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Offlineragadinks
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Agar does not solidify when PH is dropped !
    #2296845 - 02/03/04 10:59 AM (13 years, 21 days ago)

I tried to adjust the PH of some DFA agar by adding water that was soaked with peat moss. It had a PH at about 4-5. After adding the water to the dry agar/dogfood mixture the PH was up again at about 6. But the strange thing is that the agar did not solidify properly after PCing. I have tried the same with adding some citric acid to the agar and the agar did not solidify at all after PCing. It just stayed liquid as before. Does somebody with some chemical knowledge have an explanation for that ?


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Offlineblackout
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Re: Agar does not solidify when PH is dropped ! [Re: ragadinks]
    #2296873 - 02/03/04 11:13 AM (13 years, 21 days ago)

have you added too much water?


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Offlineragadinks
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Re: Agar does not solidify when PH is dropped ! [Re: blackout]
    #2296997 - 02/03/04 12:25 PM (13 years, 21 days ago)

No, the same amount as always. Just the PH was different.


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InvisibleYarry
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Re: Agar does not solidify when PH is dropped ! [Re: ragadinks]
    #2297155 - 02/03/04 01:37 PM (13 years, 21 days ago)

ive heard that sometimes at more acidic pH's it doesnt like to solidify. no idea why though


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OfflineBrokenBeast
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Re: Agar does not solidify when PH is dropped ! [Re: ragadinks]
    #2299506 - 02/04/04 04:17 AM (13 years, 20 days ago)

Have to add more agar. Same with trying to make edible jellies with acidic fruits (well, you could probably have guessed that after the citric acid experiment)...

Sorry I've no chemical explanation but just wanted to say that this is well known...


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Re: Agar does not solidify when PH is dropped ! [Re: BrokenBeast]
    #2299549 - 02/04/04 04:56 AM (13 years, 20 days ago)

Ok, at least a solution :smile: -> I will try to add more agar the next time.


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OfflineAnnoA
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Re: Agar does not solidify when PH is dropped ! [Re: ragadinks]
    #2299582 - 02/04/04 05:25 AM (13 years, 20 days ago)

>It had a PH at about 4-5

Why do you want such a low pH?

Most species like a pH between 6 and 7.


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Offlineragadinks
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Re: Agar does not solidify when PH is dropped ! [Re: Anno]
    #2299618 - 02/04/04 05:58 AM (13 years, 20 days ago)

This autumn I have found some Hypholoma capnoides and I made some prints of them. When I germinated the spores on PDYA they did very well in the beginning, but after some time growth stopped on agar and they started to die. I have read that this species likes rotten softwood best and I thought that this substrate must have a lot of humic acid which has a PH very close to peat moss I guessed. So I thought maybe this species likes a very low PH and that's why it does not grow very well on normal PDYA. And it seems to grow better on that kind of agar at least till now. I have also tried out DFA and it grows a little bit better on that.


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OfflineAnnoA
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Re: Agar does not solidify when PH is dropped ! [Re: ragadinks]
    #2299621 - 02/04/04 06:03 AM (13 years, 20 days ago)



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Offlineragadinks
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Re: Agar does not solidify when PH is dropped ! [Re: Anno]
    #2299633 - 02/04/04 06:13 AM (13 years, 20 days ago)

great link - thanks.
Do you know how they adjust the PH ?


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InvisibleYidakiMan
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Re: Agar does not solidify when PH is dropped ! [Re: ragadinks]
    #2300036 - 02/04/04 11:29 AM (13 years, 20 days ago)

Have you thought about adding conifer sawdust?


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Offlineragadinks
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Re: Agar does not solidify when PH is dropped ! [Re: YidakiMan]
    #2300416 - 02/04/04 01:41 PM (13 years, 20 days ago)

Actually that was the first I was trying out, but without result.

I still believe that it has got something to do with the PH or with some nutrients, since the formula for the agar as shown in Anno's link adds some peptone and adjusts the agar to 5.6 which is quite low.


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Amazon Shop for: Agar, Peat, pH Test Strips

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