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Invisibledaytripper05
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PDA trail and error and now a question...
    #11275963 - 10/19/09 07:51 AM (14 years, 4 months ago)

I just wanted to to a test run as this is my first time mixing my agar and I tried the PDA using potato flakes rather than making a vegetable stock, which may be better in the future. But anyway I followed the guidelines of just about everything on here and it didn't seem to go right. I just made a quart (600ml) of liquid as a test run.

I mixed 8g of crushed agar flakes, 5g of corn syrup (didn't have dextrose), and 600ml of water and stirred it up really well. I stirred each time before I poured them into pint jars (again just a test run until I get petri dishes) and I poured about 1/4 from the bottom on all....I just eye balled that part. Everything else was done on a digital scale or measuring device.

I PCed for 30 min, let the jars cool for a while, and set in the fridge. I came to them this morning and some jars were really solid, some more like jello, and others just liquid. What went wrong. I suspect not enough agar. The potato flakes never seemed to dispense in the water, just kinda suspend in the solution. Any thoughts?

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InvisibleSlimz
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Re: PDA trail and error and now a question... [Re: daytripper05]
    #11276186 - 10/19/09 09:22 AM (14 years, 4 months ago)

yeah that sounds like the agar did not mix in correctly. i buy powdered agar for cheap online.. makes it easier.


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Offlinecloudsaregathering
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Re: PDA trail and error and now a question... [Re: Slimz]
    #11276229 - 10/19/09 09:38 AM (14 years, 4 months ago)

i always use hot water to mix in my potato flakes, then add the other ingredients seems to dissolve the flakes better...


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Invisibletruskool
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Re: PDA trail and error and now a question... [Re: daytripper05]
    #11276400 - 10/19/09 10:25 AM (14 years, 4 months ago)

Heat the water before the addition of the potatoe.  I use at least double the agar when I make PDA 15-20g


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Re: PDA trail and error and now a question... [Re: daytripper05]
    #11276692 - 10/19/09 11:35 AM (14 years, 4 months ago)

uneven agar distribution was the reason for me to use my stick blenderin my potato broth when mixing agar.

that one makes sure everything is distributed super evenly !


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Invisiblenoobieshroomie
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Re: PDA trail and error and now a question... [Re: ohmatic]
    #11276718 - 10/19/09 11:40 AM (14 years, 4 months ago)

i agree heat the mix to dissolve everything first
pour then PC

  -noobie-


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CapZilla said:
not sure what GE and FAE are but i should probably get some.

Citric said:
Your signature is wrong on colonization temps!

GOOD JUDGMENT COMES FROM EXPERIENCE
EXPERIENCE COMES FROM BAD JUDGMENT

ROOM TEMP 70-75 IS BEST FOR COLONIZATION
Thank you mycochef

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Invisibledaytripper05
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Re: PDA trail and error and now a question... [Re: Slimz]
    #11277163 - 10/19/09 12:49 PM (14 years, 4 months ago)

Quote:

ohmatic said:
uneven agar distribution was the reason for me to use my stick blenderin my potato broth when mixing agar.

that one makes sure everything is distributed super evenly !




You know it didn't think this would be necessary, but I will remake a batch tonight and use my blender and hot water to mix everything. I knew it didn't look from the time I poured the agar.

Quote:

Slimz said:
yeah that sounds like the agar did not mix in correctly. i buy powdered agar for cheap online.. makes it easier.




I wanted to try it out in a hurry so I went and bought what the store had. I plan on getting powder by the pound. It can be found for $50 for 2lbs of agar powder. Do you get yours any cheaper?

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Invisibledaytripper05
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Re: PDA trail and error and now a question... [Re: ohmatic]
    #11277182 - 10/19/09 12:52 PM (14 years, 4 months ago)

Also, do you think that if I used the solid dishes they would still be viable. I can see solid suspended within the gel. I can remake them all, but want to reuse what I can.

Another thing, before I PCed the agar, the solution white but after the PC, which was 5-10min more than I wanted to do (lost track of time), and the solution came out brownish...Still translucent/slightly opaque but much darker than I have seen in pictures. Is it possible to PC too long?

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Invisibletruskool
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Re: PDA trail and error and now a question... [Re: daytripper05]
    #11277188 - 10/19/09 12:53 PM (14 years, 4 months ago)

thats pretty cheap i pay 13.50/100g

i over pc'd my agar by 15min but mine was dyed i like coloured agar i had no issues tho


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Invisiblenoobieshroomie
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Re: PDA trail and error and now a question... [Re: truskool]
    #11277219 - 10/19/09 12:59 PM (14 years, 4 months ago)

you will be fine using the ones that are solid

and yea you can over PC agar
i have done it before

i just tossed it
so i cant say if it works or not


    -noobie-


--------------------
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Best Thread Ever
CapZilla said:
not sure what GE and FAE are but i should probably get some.

Citric said:
Your signature is wrong on colonization temps!

GOOD JUDGMENT COMES FROM EXPERIENCE
EXPERIENCE COMES FROM BAD JUDGMENT

ROOM TEMP 70-75 IS BEST FOR COLONIZATION
Thank you mycochef

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Invisibledaytripper05
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Re: PDA trail and error and now a question... [Re: noobieshroomie]
    #11277237 - 10/19/09 01:02 PM (14 years, 4 months ago)

Ok. I was thinking about reusing the solution and just making it liquid again, and adding more agar to the mix while blending it. But then I thought about it being over cooked. I will just toss all but 3 of them (out of 9). Hopefully I can get the mixture right so I can get started on some much anticipated agar work.

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Invisiblenoobieshroomie
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Re: PDA trail and error and now a question... [Re: daytripper05]
    #11277262 - 10/19/09 01:05 PM (14 years, 4 months ago)

try adding all ingredients to a small pot
heat the nix but dont boil
just make sure everything is dissolved
then go from there
this will eliminate ant of the other dishes not setting up

  -noobie-


--------------------
AMU

Best Thread Ever
CapZilla said:
not sure what GE and FAE are but i should probably get some.

Citric said:
Your signature is wrong on colonization temps!

GOOD JUDGMENT COMES FROM EXPERIENCE
EXPERIENCE COMES FROM BAD JUDGMENT

ROOM TEMP 70-75 IS BEST FOR COLONIZATION
Thank you mycochef

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Invisibleohmatic
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Re: PDA trail and error and now a question... [Re: noobieshroomie]
    #11277439 - 10/19/09 01:30 PM (14 years, 4 months ago)

there is one think you do have to keep in mind when pressure cooking anything with sugar in it may it be dextrose or alike,
your sugar can CARAMELIZE if heated to long which is something you do not want.

liquid media is fine after MAX 20 mins in the clave at 15psi.
(thats for 750ml bottles)


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