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InvisibleLanaV
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What kind of peptone to use???
    #2187455 - 12/18/03 11:25 AM (12 years, 11 months ago)

Hello Everybody!

So I'm looking through a telephone book thick science/lab/chem suppliers catalog and I'm thinking to myself, "Lana, what kind of peptone is best for mycelial growth?"

Bacteriological Peptone, Casein Peptone, Dipeptone, Gelatine Peptone, Meat Peptone, Proteose Peptone, Soya Peptone etc.

What tough choices to make!

So I'm throwing this out there...

What kind of peptone do you use, and/or which is the best to use?

Thanks!
Lana


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Invisiblemicro
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Re: What kind of peptone to use??? [Re: Lana]
    #2187659 - 12/18/03 12:51 PM (12 years, 11 months ago)

I would go with the soy peptone, but that's just me. Any of the above should be a good source of protein, though, except maybe the gelatin peptone -- I have no clue what that is.

Peptone is just a peptic digest of something, and since fungi like soy this could be useful. It would probably be best to use it with a media that's not soy based.

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Offlinezeronio
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Re: What kind of peptone to use??? [Re: micro]
    #2187909 - 12/18/03 03:22 PM (12 years, 11 months ago)

Yes - soya peptone is used in agar for mushroom cultures.
I just ordered some to see if it really helps.


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InvisibleLanaV
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Re: What kind of peptone to use??? [Re: zeronio]
    #2190464 - 12/19/03 02:58 PM (12 years, 11 months ago)

Zeronio, keep me posted on what you think.  I've read that most ... well, here's a segament of what I've been reading, if you're interested in the rest just ask.  I had to turn this into an image becuase I don't know how to convert a pdf file that has tables into text with tables :smile:



Lana


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http://www.MycoSupply.com

The Premiere Source for Mushroom Growing Supplies.
Visit us online or call us toll free


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Invisiblemicro
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Re: What kind of peptone to use??? [Re: Lana]
    #2190802 - 12/19/03 04:25 PM (12 years, 11 months ago)

It said in that article somewhere that P. sinclairii mycelium grows best at a C:N ratio of 1:1 -- I don't know if that can be applied to most fungi -- I thought it was usually somewhere around 10:1. It also prefers sucrose media to starch which seems a bit odd. It's saprophytic, but also also an enthomopathogenic fungus (attacks insects -- I think this one in particular attacks larvae) so it's probably a bit different as far as nutrition is concerned vs. something that's only a saprophyte....

I also have a conflicting article about the growth rates -- PubMed something about exopolysaccharide production in Paecilomyces sinclairii -- their results are different. If you want the article I can email it to you as an attachment on Monday.


I think the best thing to do would be trial and error. Like I said above, peptone is just a source of protein, so any peptone should work. The efficiency of each type would probably depend on the specific fungal requirements for different types of proteins at whatever amounts and the type of media you're using and what it might be lacking. It can still break the protein down, though. Just try to keep the C:N ratio around 10:1.

The thing that's worked best for me as an additive, though, is a non-essential amino acid mix (I used the one for D-MEM @ 1/2 X) -- worked wonders -- beautiful rhizomorphic mycelium.

JMO

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Offlinebonsai
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Re: What kind of peptone to use??? [Re: micro]
    #2196753 - 12/22/03 11:36 PM (12 years, 11 months ago)

The one Stamets sells is from SIGMA

Enzymatic hydrolysate
Type IV: From Soybean

Total nitrogen: apx. 8%
Amino nitrogen: apx 2%

bonsai


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Invisiblemicro
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Re: What kind of peptone to use??? [Re: micro]
    #2197370 - 12/23/03 10:12 AM (12 years, 11 months ago)

Quote:

micro said:
It said in that article somewhere that P. sinclairii mycelium grows best at a C:N ratio of 1:1




Sorry -- forgot about this thread. For some reason pictures aren't coming up, but in the table the C/N ratio for the highest dry mass was 20:1

Quote:

Effect of C/N ratio

The C/N ratio is an important factor affecting fruiting body formation in mushroom cultures. The effect of C/N ratio (mass ratio) on mycelial growth and exopolysaccharide production was investigated in the medium of sucrose and corn
steep powder. As shown in Table 1, higher C/N ratio was preferred for mycelial growth. On the other hand, exopolysaccharide production was not significantly increased over C/N ratios of 12 : 1.

Letters in Applied Microbiology Volume 34 Issue 6 Page 389 - June 2002 doi:10.1046/j.1472-765X.2002.01105.x

Influence of nutritional conditions on the mycelial growth and exopolysaccharide production in Paecilomyces sinclairii S.W. Kim, H.J. Hwang, C.P. Xu, Y.S. Na, S.K. Song & J.W. Yun




The 20:1 sounds a lot more likely -- I think the first article is wrong.

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Micro


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