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coffeehead
Perpetual Learner

Registered: 01/15/13
Posts: 142
Last seen: 6 years, 1 month
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Pasteurization and Endospores?
#18446284 - 06/20/13 09:39 AM (11 years, 6 months ago) |
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I understand the theory behind soaking grain to open endospores prior to boiling. My question is, why don't you have to do the same thing to the fruiting medium before pasteurization?
Do the fruiting mediums (eg. straw, wood chips, manure) not contain (or contain very few) of those nasty endospores that will open up later and cause contamination? Or does the spawn colonize the fruiting medium so quickly/vigorously that the mycelium overpowers any endospore contaminants?
Just curious, because it kinda doesn't make sense to me.
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veda_sticks
Cultivator




Registered: 07/29/07
Posts: 14,191
Loc: UK
Last seen: 5 years, 13 days
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Re: Pasteurization and Endospores? [Re: coffeehead]
#18446305 - 06/20/13 09:45 AM (11 years, 6 months ago) |
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Quote:
coffeehead said: I understand the theory behind soaking grain to open endospores prior to boiling. My question is, why don't you have to do the same thing to the fruiting medium before pasteurization?
Do the fruiting mediums (eg. straw, wood chips, manure) not contain (or contain very few) of those nasty endospores that will open up later and cause contamination? Or does the spawn colonize the fruiting medium so quickly/vigorously that the mycelium overpowers any endospore contaminants?
Just curious, because it kinda doesn't make sense to me.
soaking the grains is not really to do with allowing endospores to germinate.
its more to do with softening the grain up so they dont burst during the boil or simmer which will result in starch being released that makes sticky grains.
With bulk substrates we dont sterilise so even if germinating endospores happens, pasturisation wouldnt kill all the bacteria.
The point of pasturisation is to kill of molds while leaving behind bacteria that is benifical for myceluim and also to help make competitor organisms from getting a hold of the substrate.
That combined with getting it colinised quickly stop contamination from happening. 2 weeks is the longest you want for colinisation of a bulk substrate, after 2 weeks it becomes more susceptible to being contaminated.
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coffeehead
Perpetual Learner

Registered: 01/15/13
Posts: 142
Last seen: 6 years, 1 month
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Re: Pasteurization and Endospores? [Re: veda_sticks]
#18446853 - 06/20/13 12:18 PM (11 years, 6 months ago) |
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Thanks for the info, it makes sense perfect sense.
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